JP3870359B2 - Net shape simulation program, fishing net simulation program, fishing simulation program and fishing control system - Google Patents

Description

  The present invention relates to a net shape simulation program for causing a computer to simulate the shape and movement of various nets used in fisheries and the like in water, and performs a general numerical simulation of the behavior of nets in water. It can be executed.

  In addition, the net shape simulation is applied to a fishing net to simulate a fishing net and accessories, and further to simulate a fishing net and accessories in a fishing rod.

  In addition, simulation of fishing nets and accessories in this fishing rod and fish information and sea bottom information from fish finder etc. are synthesized and displayed as an image so that the trends of fishing gear and fish school can be grasped in real time. The information can be used to automatically or manually control the operation of boat maneuvers and fishing equipment. In addition, it is possible to estimate the shape of the net in the sea during actual fishing according to the fishing environment at that time, and to set a net suitable for the situation at that time. The present invention relates to a fishing rod control system that facilitates selective fishing methods and enables resource management, and also contributes to the prevention, grasp and mitigation of fishing boat / fishing gear accidents in operation.

  In the production of net fishing gear, it is necessary to estimate at the design stage whether the net is shaped as expected in water or how much load acts on the fishing gear. Therefore, the method of estimating these by performing a water tank model experiment conventionally is generally applied. In the aquarium model experiment, a real scale model is made and installed in a dedicated experimental facility called a large circulating water tank or towing tank together with a measuring instrument.

In addition, in order to confirm the shape of the fishing net in the sea during actual use, for example, an ultrasonic pulse is transmitted from the fishing boat to the fishing net, and this reception is computer processed to confirm the shape of the fishing net. Such a method has also been proposed.
JP-A-9-166660

  However, in such a method, it takes a lot of time from experiment preparation such as model production to actual experiment and analysis in a water tank, and the cost is high. In addition, every time the experiment contents are changed, a new scale model needs to be produced, and the time and cost are high.

  On the other hand, in recent years, there is an urgent need to develop a selective fishing method that selectively catches only the fish species to be caught. Needs to be grasped.

  However, these requirements are no longer met by the tank model experiment. In the tank model experiment, there is a limit to grasping detailed physical quantities such as the tension distribution acting on the net thread, and it is impossible to grasp in detail the behavior during operation of the net fishing gear and even the shape of the net mesh Met.

  Furthermore, if it is possible to infer the shape of the net in the sea during actual fishing according to the fishing environment at that time, it will be possible to set a net suitable for the situation at that time. As the catch increases, selective fishing methods become easier and resource management becomes possible.

  However, in order to simulate the net shape during fishing, in addition to the laboratory net shape simulation, if simulation is not performed in consideration of the fishing ground environment and fishing conditions at that time, the correct simulation result will be obtained. It is not possible.

  In addition, the patent application in which the position of an actual fishing net is confirmed while being used on a fishing boat cannot confirm the detailed shape of the fishing net in the sea.

  Therefore, in order to solve the above problems, a network shape simulation program according to the present invention is a program for simulating changes in the network shape when a computer has a flow in water and displaying it as an image. (1) Net thread thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Net material (6) Condensation, (7) Angle of net legs, (8) Additional mass coefficient, (9) Drag coefficient setting means, net moving speed and resistance in water In order to set (1) fluid density, (2) environmental condition setting means for setting the flow direction and flow velocity, the network conditions set by the network condition setting means, and the environmental condition setting means Based on environmental conditions In order to identify the mesh shape based on the calculation results of the nodule / leg position calculating means for calculating the position of each arbitrary nodule / leg part of the mesh with the passage of time It functions as a mesh shape calculation means and a mesh shape display output means for displaying the mesh shape specified by the mesh shape calculation means as an image.

  In addition to the above, the computer uses a nodule / leg tension calculating means for calculating the tension of each arbitrary nodule / leg of the mesh with time, and the calculated leg tension and nodal tension as an image. It functions as a tension display output means for displaying, and further changes the color of tension display depending on the strength of the tension.

  A fishing net simulation program according to the present invention is a program for simulating and displaying a change in a fishing net when the computer has a flow in the water, and displays the image as a computer image (1) Net thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Specific gravity of net material, (6) Constriction, (7) Net condition setting means for setting the angle of the net legs, (8) additional mass coefficient, and (9) drag coefficient, the type of accessory to be used, and the accessory for setting the physical condition according to the type Condition setting means, environmental condition setting means for setting (1) fluid density, (2) flow direction / flow velocity, in order to set the moving speed and resistance of the net and accessories in the water, the above net condition setting Set by means Based on the conditions, the accessory conditions set by the accessory condition setting means, and the environmental conditions set by the environmental condition setting means, the positions of the arbitrary knots / legs of the mesh and the accessories over time Knot part / leg / attachment position calculating means, net shape calculating means for specifying the net shape based on the calculation results of the knot / leg / attachment position calculating means, and net shape calculating means And the mesh shape / attachment display output means for displaying the mesh shape specified by the nodule / leg / attachment position calculation means and the accessory position as an image.

  In addition to the above, the computer calculates the knots / legs / attachment tension calculating means for calculating the tension of each arbitrary knot / leg of the mesh and each accessory with the passage of time, It functions as a tension display output means for displaying the knot portion tension and accessory tension as an image, and the color of the tension display is changed depending on the strength of the tension.

  Furthermore, a fishing simulation program according to the present invention is a program for causing a computer to simulate a fishing situation during fishing and display it as an image. The computer uses the computer for fishing nets. (1) Net thread thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Net material specific gravity, (6) Constriction, (7) Net leg angle, ( 8) network condition setting means for setting the additional mass coefficient, (9) drag coefficient, accessory condition setting means for setting the type of accessory used and the physical condition corresponding to the type, In order to set the movement speed and resistance of nets and accessories during fishing, (1) environmental density setting means for setting fluid density, (2) flow direction and flow velocity, and fishing winches for fishing boats used for operation The ability of wire rope Fishing boat condition setting means for setting the length and length, fishing boat size and main engine output and propeller pitch, the fishing rope winch wire rope feed length and speed, and the winding length and winding speed and angle for the fishing boat in operation As well as tension, spacing of net members such as otter boards and net spacing, fishing boat propeller rotation speed and rudder angle, towing horse power, fishing boat and fishing gear positions based on position measuring equipment, ground speed and water speed Operation condition setting means, natural condition setting means for setting water temperature, tidal current direction / velocity, wave height / wavelength / cycle, wave direction / velocity, wind condition / mean speed for the natural environment during operation; The net conditions set by the above, the accessory conditions set by the accessory condition setting means, the environmental conditions set by the environmental condition setting means, and the fishing boat condition setting means With the passage of time of each nodule part / leg part of the netting and each accessory based on the fishing boat conditions, the operating conditions set by the operating condition setting means, and the natural conditions set by the natural condition setting means A nodule / leg / attachment relative position calculation means for calculating the relative position with the fishing boat, a fishing net shape calculation means for specifying the fishing net shape based on the calculation results of the nodule / leg / attachment relative position calculation means, It is made to function as a fishing net / attachment display output means for displaying the shape of the fishing net and the position of the accessory specified by the fishing net shape calculating means and the nodule / leg / attachment relative position calculating means.

  In addition to the above, the computer can be used to calculate the tension of the knots / legs / attachment tension for each arbitrary knot / leg of the mesh and each accessory, and the calculated leg tensions. And the tension display output means for displaying the knot portion tension and the accessory tension as images, and the color of the tension display is changed depending on the strength of the tension.

  On the other hand, a fishing control system according to the present invention is a system for visually displaying the status of fishing during fishing on an arbitrary image display device using a computer. (2) Net leg length, (3) Nodule size, (4) Net size, (5) Specific gravity of net material, (6) Constriction, (7) Net leg Network condition setting means for setting the angle, (8) additional mass coefficient, (9) drag coefficient, and accessory for setting the type of accessory used and its physical condition In order to set the equipment condition setting means, and the movement speed and resistance of the nets and accessories during fishing, (1) environmental density setting means for setting the fluid density and (2) flow direction / velocity, and Regarding the fishing boat used, the ability of the fishing winch and the thickness and length of the wire rope, Fishing boat condition setting means for setting the power, main engine output and propeller pitch, and for the fishing boat in operation, the wire rope feed length and speed of the fishing winch, the winding length, the winding speed and angle, the tension, the otter board Operating condition setting means for setting the spacing and net spacing of the widening members such as, the propeller rotation speed and rudder angle of the fishing boat, towing horse power, fishing boat and fishing gear position based on position measurement equipment, ground speed and water speed About the natural environment during operation, water temperature, tidal current direction / velocity, wave height / wavelength / period, wave direction / velocity, natural condition setting means, and exploration / fish collection information during operation , Fish detection and fish collection information setting means for setting fish detection and seabed information based on fish finder, sonar information based on scanning sonar, and fish collection information such as fish collection lights and flow objects The net conditions set by the net condition setting means, the accessory conditions set by the accessory condition setting means, the environmental conditions set by the environmental condition setting means, and the fishing boat set by the fishing boat condition setting means Based on the conditions, the operating conditions set by the operating condition setting means, the natural conditions set by the natural condition setting means, and the fish detection / fish collection information set by the fish detection / fish collection information setting means, Relative position calculating means for calculating the relative position of the optional nodule / leg and the fishing boat over time of each accessory A fishing net / attachment display output means for displaying the shape of the fishing net identified by the relative position calculation means and the position of the accessory as an image, a fish finder by the fish finder, seabed information, and a sonar information by the scanning sonar. A fish school display output means for displaying as an image, and a simulation image of the fishing net / accessory by the fishing net / accessory display output means and a fish image by the fish display output means are synthesized by the image synthesis means and displayed simultaneously. It is a thing.

  In addition to the above, the knot part / leg / attachment tension calculating means for calculating the tension of each arbitrary knot part / leg part and each accessory of the net with the passage of time, and the calculated leg tension and knot of each leg Tension display output means for displaying the part tension and accessory tension as images, and the color of the tension display is changed depending on the strength of the tension.

  As an effect of the present invention, conventionally, the observation and measurement of the shape of the meshwork under water and the tension acting on the mesh thread are methods other than conducting a model experiment in a large experimental water tank, except for directly observing the actual thing on site. There was no. By using the numerical calculation method of the present invention, it becomes possible to grasp the net shape and net yarn tension in water in detail on a personal computer, and it is not necessary to carry out on-site observations or water tank experiments. Cost can be significantly reduced. It is expected to have a huge effect on product development support.

  In addition, since the fishing situation including the fishing net can be confirmed in detail on the fishing boat in operation, it is possible to set the optimum operating situation according to the situation at that time. Therefore, selective fishing methods become possible, and appropriate operations can be performed while managing resources.

  Furthermore, when combined with fish school information as a fishing control system, the fishing situation estimated by computer and fish school information by fish finder can be synthesized and displayed on a single screen, so that trends in fishing gear and school can be grasped in real time. Therefore, it is possible to automatically or manually control the operation of boats and fishing equipment based on the information, which contributes to the prevention, grasp and mitigation of fishing boat / fishing gear accidents during operation. As a result, as the catch increases, selective fishing methods become easier and resource management becomes possible.

  First, a calculation method for calculating the mesh shape using a computer in the present invention will be described with reference to FIGS.

  FIG. 1 is a conceptual diagram of a calculation model for estimating the shape and tension of a net. It is assumed that the net has a mass point A arranged at the nodule portion, a mass point B arranged at the leg portion, and a spring C whose mass is negligible. The mass is concentrated only on the mass point, and the mass point and the spring connecting the mass point are not constrained to each other other than the tensile force of the spring, and the moment is not considered. The shape of the mesh is obtained by calculating the coordinate position of each mass point at a certain time. The coordinate position of the mass point is calculated by solving the equation of motion derived for the mass point.

First, the derivation of the equation of motion of the mass point arranged at the nodule will be described.
As shown in FIG. 2, an x, y, z orthogonal coordinate system is defined, and the mass point position can be defined by (x, y, z). The network is assumed to exist in static fluid or in a spatio-temporal uniform flow. Assuming that the fluid force (drag and added mass force) acting on the mesh works only on the mass point, and the shape of the mass point arranged at the nodule is assumed to be a sphere, the magnitude of the drag and added mass force should not change with the flow direction. For example, the equation of motion related to the mass point can be expressed by the following equation.

・・・１

... 1

  Where α is the acceleration vector of the mass point, T is the tension vector that receives the action from the spring acting on the mass point, F is the drag vector, and W and B are the gravity and buoyancy vectors, respectively. Since these vectors are space vectors, they are three-dimensional components. Mi and ΔMi represent mass of mass and added mass, respectively. Since it is assumed that the additional mass does not change depending on the flow direction, it is defined by the following equation as a constant independent of directionality.

・・・２

... 2

Here, ρ, CM, and V0 are the fluid density, the additional mass coefficient, and the volume of the mass point, respectively.
The magnitude of the tension acting on the mass point i from each spring is expressed as follows.

・・・３

... 3

  Where L is the natural length of the spring and k is the linear spring constant. When the distance between i and j is smaller than L, Tj = 0. Therefore, if each unit vector in the direction connecting the mass point i to another mass point j is Ej and its components are Ej = (ejx, ejy, ejz), x of the tension vector T acting on the mass point i in the equation (1) , Y and z direction components can be expressed by the following equations, respectively.

・・・４

... 4

  The x, y, and z components of the drag vector F acting on the mass point i in the equation (1) are expressed by the following equation where the steady flow velocity of the fluid is V = (u, v, w).

・・・５

... 5

  Here, CD and S represent the drag coefficient and the projected area of the mass point, respectively, and xi ', yi' and zi 'represent the first-order derivatives with respect to time of xi, yi and zi, respectively. Further, as described above, since it is assumed that the drag does not depend on the flow direction, CD and S of each component are set to the same value. However, since the value of CD is expected to change depending on the flow velocity, CD is given by the following equation as a function Reynolds number Re.

・・・６

... 6

Here, the Reynolds number Re has the diameter of the sphere as a representative length.
Gravity W and buoyancy B in equation (1) can be expressed as the following equations, where the magnitudes are w0 and b, respectively.

・・・７

... 7

  Substituting Equations 2-7 into Equation 1 yields the following equation for the acceleration α = (xi ", yi", zi ") of the mass point i.

・・・８

... 8

The negative sign of the drag indicates that it acts in the opposite direction to the direction of motion. Since the right side of Equation 8 is a function of the positions (xi, yi, zi), (xj, yj, zj) of the mass points i, j and the velocity component (xi ', yi', zi ') of the mass point i.
The relation of the following equation holds for α = (xi ", yi", zi ") = (dxi '/ dt, dyi' / dt, dzi '/ dt).

・・・９

... 9

  Further, (xi ', yi', zi ') is defined by the following equation.

・・・１０

... 10

  Since Equations 9 and 10 are six ordinary differential equations relating to the six unknown variables xi, yi, zi, xi ', yi', zi 'of the mass points, if initial conditions at time t = 0 are given, These six unknown variables xi, yi, zi, xi ', yi', zi 'can be solved numerically. If xi, yi, zi, xi ', yi', zi 'are calculated for all mass points, the tension Tj can be obtained from equation (3).

Next, derivation of the equation of motion of the mass point arranged at the center of the leg will be described.
As shown in FIG. 3, a mass point is arranged at the center of the leg and this equation of motion is derived. It is assumed that the drag and additional mass force acting on the leg can be expressed by the drag and additional mass force acting on the cylindrical object. Therefore, the drag force and additional mass force acting on the mass point arranged on the leg vary depending on the direction in which the mass point moves. Consider the mass motion of FIG. An axis parallel to the line segment 1-2 passing through the mass point and connecting the mass point 1 and the mass point 2 is defined as τ. A coordinate axis that passes through the mass point i and is perpendicular to the axis τ on the plane including the flow velocity vector V = (u, v, w) of the steady flow and the coordinate axis τ is η. Furthermore, a three-dimensional local coordinate system is set with the axis perpendicular to τ and η as ξ and the mass point i as the origin. The flow velocity vector of the fluid and the motion direction vector of the mass point i are always divided into components of the tangential direction τ and the normal directions η and ξ of the line segment 1-2. Assuming that the drag acting on the mass point can always be defined as the resultant force proportional to the square of the relative flow velocity in the tangential and normal directions, the drag coefficient of the mass point can be determined only in the τ, η, and ξ directions. The drag of the mass point i placed in the center of The additional mass coefficient is calculated using the same method. Based on this assumption, if the equation of motion of the mass point i is derived for each component of the local coordinate system τ, η, ξ, there is no need to change the drag coefficient and additional mass coefficient in the equation of motion according to the direction of motion of the mass point i. The complexity of formulation can be avoided.

  The unit vectors in the direction connecting the mass points 1 and 2 extending from the mass point i are denoted as ei1 and ei2, respectively, and the unit vectors on the τ, η, and ξ axes are denoted as eτ, eη, and eξ. The τ-axis direction component Tτ of the tension acting on the mass point i is expressed by the following equation, where T1 is the magnitude of the tension acting between the mass point i and the mass point 1, and T2 is the magnitude of the tension acting between the mass point i and the mass point 2. be able to.

・・・１１

... 11

  In the equation, • represents a scalar product of vectors, and T1 and T2 are defined as forces proportional to the elongation from the natural length of the spring as in equation 2. Similarly, Tη and Tξ which are η and ξ axial components of tension are expressed by the following equations.

・・・１２

... 12

  The components of the relative velocity τ, η, and ξ with respect to the fluid of the mass point can be expressed as τi'-eτ · V, ηi'-eτ · V, and ξ ', respectively. It can be expressed by a formula.

・・・１３

... 13

  Here, CD.tau., CD.eta., CD.xi., S.tau., S.eta., And S.xi. represent the drag coefficient and projected area with respect to the coordinate axis direction, respectively. The values of CD η and CD ξ are assumed to change depending on the flow velocity, and are given by the following equations as a function of Reynolds number Re, respectively.

・・・１４

... 14

・・・１５

... 15

  Here, the Reynolds number Re is a representative length when the mass point shape is regarded as a cylindrical object.

  If the gravity and buoyancy vectors acting on the mass point i are respectively W = (0,0, -wi) and B = (0,0, bi), these local coordinate components are as follows.

・・・１６

... 16

・・・１７

... 17

  Accordingly, when the equation of motion related to the mass point i is derived for each component of τ, η, and ξ, the following equation is obtained.

・・・１８

... 18

  Here, ΔMτ, ΔMη, and ΔMξ are local coordinate components of the additional mass coefficient of the mass point i and are defined by the following equations.

・・・１９

... 19

  However, CM η represents an additional mass coefficient of the η direction component. If equations 11-17 are substituted into equation 18, the equation of motion can be obtained. For example, if the equation of motion in the τ direction is derived, the following equation is obtained.

・・・２０

... 20

  Now, in order to unify the variables on the right side of the above equation into the absolute coordinate system, the velocity term τi ′ expressed in the local coordinate system is expressed by (xi ′, yi ′, zi ′). The unit vectors eτ, eη, and eξ on the τ, η, and ξ axes are expressed as follows.

・・・２１

... 21

The relationship between (xi ′, yi ′, zi ′) and (τ ′, η ′, ξ ′) is given by the following equation.

・・・２２

... 22

  However, [C] is defined by the following equation.

・・・２３

... 23

Therefore, τ ′, η ′, and ξ ′ included in Equation 18 can be expressed using xi ′, yi ′, zi ′ from the relationship of Equation 22, and the right side of Equation 18 is all expressed in an absolute coordinate system. It will be.
The relationship between (xi ", yi", zi ") and ([tau]", [eta] ", [xi]") can be expressed as

・・・２４

... 24

  Substituting equation 18 into the right side of equation 24, (xi ", yi", zi ") will eventually become (xi ', yi', zi '), (xi, yi, zi), (x1, y1, z1), ( x2, y2, z2), and the 18 equations are given as ordinary differential equations as in the following equations as well as the 9 and 10 equations.

・・・２５

... 25

・・・２６

... 26

  Therefore, as with the mass point arranged at the nodule, if the initial condition at time t = 0 is given, these six unknown variables xi, yi, zi, xi ', yi', zi 'can be calculated numerically. it can. The tension acting on the mass point can also be obtained from this calculation result, as in the case of the mass point arranged on the nodule. Therefore, the position and tension at an arbitrary time can be obtained by calculation for an arbitrary node and an arbitrary leg. And the shape as a net is expressed by connecting these nodule parts and leg parts obtained by calculation. Then, by calculating the net shape every arbitrary time, it is possible to simulate a dynamic net shape every time.

  FIG. 4 compares an image (A) when a real net is installed in flowing water with a flow velocity of 41 cm / s and a numerical simulation result (B) obtained by applying the calculation method of the present invention. The shape matches very well. Since the numerical simulation results can be grasped as calculation results up to the tension acting on one mesh thread, it is also possible to express the value of the mesh thread tension with different colors as shown in FIG. 4 and FIG. Become. FIG. 6 shows a result of measuring the load acting on the net in running water by a water tank experiment and comparing the result with the calculation method of the present invention. The calculated value and the experimental value are in good agreement at any flow rate, and it can be confirmed that the result by the calculation method of the present invention is sufficiently valid.

  And there is a limit to the detailed observation and measurement in the actual field and aquarium model experiment, but if the result calculated by the calculation method of the present invention is visualized, the net shape in water as shown in FIG. In addition to observing from an arbitrary viewpoint, as shown in FIG. 8, it is possible to simulate a dynamic mesh shape over time. Further, as shown in FIG. 9, it is possible to enlarge the portion to be observed and to grasp the shape of the mesh in detail. As described above, the application of the present invention not only has a great effect on the efficiency of product development of net fishing gear. In addition to being useful as a powerful design support tool for the development of new fishing gear that can selectively catch only specific fish species, it is expected to be used for highly accurate performance evaluation during design development.

  Next, each embodiment of the net shape simulation program, fishing net simulation program, fishing simulation program and fishing control system of the present invention will be described with reference to the drawings.

  The configuration of a network shape simulation program for causing a computer to function as the following means in order to simulate and display an image of a change in the network shape when the computer has a flow in water will be described with reference to FIG. To do.

  1 is a net condition setting means for the net to be simulated (1) the thickness of the net thread, (2) the length of the net leg, (3) the size of the knot, and (4) the size of the net , (5) specific gravity of the netting material, (6) contraction, (7) angle of the net legs, (8) additional mass coefficient, and (9) drag coefficient. For example, an input screen for inputting such items is displayed on the monitor, and network conditions are input in accordance with the screen display instructions. As the size of the nodule, for example, the shape and area are input, and as the size of the mesh, the projected area, weight, and volume of the mesh are input.

  Reference numeral 2 denotes environmental condition setting means for setting (1) fluid density and (2) flow direction / flow velocity in order to set the moving speed and resistance of the net in water. For example, an input screen for inputting such items is displayed on the monitor, and input is performed in accordance with a display instruction.

  Reference numeral 3 denotes a nodule / leg position calculation means, which is based on the net conditions set by the net condition setting means 1 and the environmental conditions set by the environmental condition setting means 2. The position with the passage of time is calculated. Reference numeral 4 denotes a net shape calculation means, which specifies the net shape at an arbitrary time based on the calculation result of the nodule / leg position calculation means 3.

  Reference numeral 5 denotes a nodule / leg tension calculating means for calculating the tension of each arbitrary nodule / leg of the mesh with time.

  In addition, as a specific calculation procedure of the position and tension of a nodule part and a leg part with the passage of time, for example, calculation can be performed by causing a computer to perform the above-described calculation method. Further, since the positions of the nodule portion and the leg portion with the passage of time can be calculated, the net shape at an arbitrary time can be specified by calculating with a computer. When actually calculating the position of the nodule and leg, it is desirable to calculate all the nodule and leg, but depending on the ability of the computer used, it takes a long time to calculate all Therefore, it is desirable that the location (number) used for the calculation can be adjusted as appropriate.

  Reference numeral 6 denotes a network shape display output means for displaying the network shape specified by the network shape calculation means 4 on a monitor or the like as a three-dimensional image.

  Reference numeral 7 denotes tension display output means for displaying the nodule / leg tension calculated by the nodule / leg tension calculating means 5 on a monitor or the like as an image. Note that the color of the tension display may be changed depending on the strength of the tension.

  Next, the flow of the program will be described based on the flowchart of FIG.

  In an input step (S1) for displaying the input screen on the monitor, items necessary for the simulation of the mesh shape are sequentially input. First, in the net condition input setting step (S2) for displaying the net condition setting input screen, the net thread thickness, the net leg length, the knot size, the net size of the net to be simulated are displayed. Enter the size, the specific gravity of the netting material, the compaction, the angle of the netting legs, the additional mass coefficient, and the drag coefficient. Note that the angle of the mesh and the net legs specify the shape of the net at the start of the simulation, and the scale indicates the extent of the mesh, and the angle of the net legs is the angle that the leg makes with the perpendicular. These may be input and set each time, but a reference value may be prepared in advance and selected on the screen.

  Next, in the environmental condition input setting step (S3) for displaying an input screen for setting environmental conditions, fluid density, flow direction and flow velocity are input in order to set the moving speed and resistance of the net in water. Instead of inputting the density directly, the fluid density may be programmed so that, for example, the water temperature is input and converted into the density.

  Either the network condition or the environmental condition may be performed first, and these input screens can be displayed at any time according to various simulation conditions, and the setting conditions can be changed. Then, in the condition setting determination step (S4) for determining whether or not the necessary condition has been input, if the condition necessary for performing the simulation is set and input, the process proceeds to the next calculation step and the condition setting is insufficient. Or, when it is determined that it is wrong, a necessary input screen is displayed again to correct the setting item.

  When the conditions necessary for the simulation are set and input, the network conditions are set based on the network conditions set in the network condition input setting step (S2) and the environmental conditions set in the environmental condition input setting step (S3). The position and tension of each arbitrary nodule portion / leg portion of the ground with the passage of time are calculated, and the net shape and tension at the arbitrary time are calculated and specified in the net shape calculation step (S5).

  In addition, as a specific calculation procedure of the position and tension of the nodule part and the leg part over time, for example, it can be calculated by causing the computer to perform the above-described calculation method. In addition, since the positions of the nodule part and the leg part with the passage of time can be calculated, the network shape at an arbitrary time can be specified by calculating with a computer based on the simulation start time. When calculating the positions of nodules and legs with a computer, it is desirable to calculate all the nodules and legs, but if all are calculated as described above, it takes time to calculate. Therefore, the location (number) used for the calculation is selected from the screen display within a range that does not hinder the simulation of the mesh shape.

  When the mesh shape and tension are calculated in the mesh shape calculation step (S5), the mesh shape and tension at an arbitrary time are calculated in the mesh screen display output step (S6) for processing and outputting the image. An image is output to be displayed on the monitor, and the mesh shape and tension are displayed on the monitor in a mesh image display step (S7) so as to be visually captured three-dimensionally as shown in FIG. Further, as shown in FIG. 8, a plurality of simulation results for each elapsed time may be displayed on the same screen. In addition, in order to make it possible to visually recognize the strength of the tension immediately, the display color of each leg portion or each nodule portion may be changed depending on the strength of the tension. Further, the mesh shape may be displayed with the viewpoint changed as shown in FIG. 7, or may be displayed partially enlarged as shown in FIG.

  A configuration of a fishing net simulation program for causing a computer to function as the following means in order to simulate and display a change in a fishing net when the computer has a flow in water will be described with reference to FIG. Note that description of the same components as those in the first embodiment is omitted. This program is applicable not only for laboratory use, but also for fishing nets that are not towed by fishing boats, such as stationary nets and stabbed nets, and are basically fixed in position.

  Reference numeral 8 denotes an accessory condition setting means, which sets the type of accessory to be used and the physical condition corresponding to the type. An input screen for input is displayed on the monitor, and the condition of the accessory is input according to the display instruction. The accessories vary depending on the type of fishing gear used, for example, trawl net, stabbed net, winding net, stationary net, etc., so input screens for floats, sinks, ropes, metal fittings, wires, etc. will be displayed depending on the type of fishing gear Display and input items necessary for the simulation such as size (length / thickness), volume, weight, projected area, shape, specific gravity, etc.

  Reference numeral 9 denotes a nodule portion / leg portion / attachment position calculation means, and in the same manner as the nodule portion / leg position calculation means 3 of the first embodiment, the time passes for each arbitrary nodule portion / leg portion and each accessory. Calculate the position. Note that the accessory calculation method can be calculated by the same procedure as the above-described calculation method of the nodule / leg position. For example, according to the shape, size, and structure of each accessory, they are divided into appropriate parts, and the calculation is performed assuming that each part can be regarded as equivalent to a leg or a nodule.

  Reference numeral 10 denotes a knot portion / leg portion / attachment tension calculating means, which is similar to the knot portion / leg portion tension calculating means 5 of the first embodiment with the passage of time of each arbitrary knot portion / leg portion and each accessory. Calculate the tension. The calculation method for the accessory can be calculated by the same procedure as the calculation method for the tension of the nodule / leg. For example, according to the shape, size, and structure of each accessory, they are divided into appropriate parts, and the calculation is performed assuming that each part can be regarded as equivalent to a leg or a nodule.

  Reference numeral 11 denotes a mesh shape / attachment display output means, which displays the mesh shape and accessory position specified by the mesh shape calculation means 4 and the nodule / leg / attachment position calculation means 10 as an image on the monitor. To do.

  Reference numeral 12 denotes tension display output means for displaying the nodule / leg tension and accessory tension calculated by the nodule / leg / attachment tension calculating means 10 on the monitor as images. Note that the color of the tension display may be changed depending on the strength of the tension.

  Next, the flow of the program will be described based on the flowchart of FIG. Note that a description of the same parts as the network simulation program described above is omitted.

  In an input step (S1) for displaying the input screen on the monitor, items necessary for the simulation of the mesh shape are sequentially input. Subsequent to the network condition input setting step (S2), in the accessory condition setting step (S8) for displaying an input screen for accessory condition setting, the type of accessory to be used and the physical condition corresponding to the type are set. Lets you enter accessory conditions to do. The accessories vary depending on the type of fishing gear used, for example, trawl net, stabbed net, winding net, stationary net, etc., so input screens for floats, sinks, ropes, metal fittings, wires, etc. will be displayed depending on the type of fishing gear Display and input size (length / thickness), volume, weight, projected area, shape, specific gravity, etc. These may be input and set each time, but a reference value may be prepared for each item in advance and selected on the screen.

  In addition, any setting input of the network condition, accessory condition, and environmental condition may be performed first, and these input screens can be displayed at any time according to various simulation conditions, and the setting conditions can be changed. Is possible. In addition, when conducting on-site simulations such as stationary nets and gill nets instead of laboratory simulations, the environmental conditions depend on the conditions at the actual fishing grounds, the fluid density based on the water temperature, and the flow direction / velocity based on the tidal and ocean currents. Can also be used. In addition, it is also possible to use the wind direction / velocity as the flow direction / velocity for the accessories on the water surface.

  When conditions necessary for the simulation are set and inputted, the network conditions set in the network condition input setting step (S2), the accessory conditions set in the accessory condition setting step (S8), and the environment Based on the environmental conditions set in the condition input setting step (S3), the positions and tensions of the arbitrary knots and legs of the mesh and the attachments over time are calculated. The tool position and tension are calculated and specified in the mesh shape / attachment calculation step (S9).

  When the mesh shape and each accessory position and tension are calculated in the mesh shape / attachment calculation step (S9), the mesh shape / attachment screen display output step (S10) for processing and outputting them for image display. And output the net shape and tension at any time and the position and tension of the accessory to be displayed on the monitor as images, and the mesh shape and tension and the position and tension of the accessory on the monitor. In the display step (S11), display is performed so that it can be visually grasped in three dimensions. Note that the display color of each leg, each knot, and each accessory may be changed depending on the strength of the tension so that the strength of the tension can be recognized immediately.

  A configuration of a fishing simulation program for causing a computer to function as the following means in order to simulate and display a fishing situation during fishing on a computer will be described with reference to FIG. This program is particularly suitable for fishing towed nets by fishing boats, such as trawl fishing, but it can also be applied to other types of bottom net fishing and purse seine fishing, and has no meshes like tuna longline fishing. In particular, it can be applied to fishing gear composed of ropes. In addition, the section of the rope may be calculated according to the net and the accessories.

  20 is a net condition setting means for the net used for fishing (1) Net thread thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Specific gravity of netting material, (6) Consolidation, (7) Angle of net leg, (8) Additional mass coefficient, (9) Drag coefficient are set. The input contents and method are the same as in the first embodiment.

  21 is an accessory condition setting means, and sets the type of the accessory used for fishing and the physical condition according to the type. The input contents and method are the same as in the second embodiment.

  Reference numeral 22 denotes an environmental condition setting means for setting (1) fluid density and (2) flow direction / flow velocity in order to set the moving speed and resistance of the net and the accessory during fishing. The input contents and method are the same as in the first embodiment. The fluid density, flow direction, and flow velocity may be automatically and sequentially updated based on a water temperature, a tidal current, and a ship speed, which will be described later.

  Reference numeral 23 denotes fishing boat condition setting means for setting the fishing winch capability, wire rope thickness and length, fishing boat size, main engine output and propeller pitch for the fishing boat used for operation. An input screen for input is displayed on the monitor, and the conditions of the fishing boat are input in accordance with the display instructions. These items are preconditions for judging the overload of the main engine, fishing winch and wire rope mainly due to various conditions during fishing.

  24 is an operating condition setting means for the fishing boat in operation; the wire rope feeding length and speed, the winding length and winding speed and angle of the fishing winch, the tension, the spacing of the expansion members such as the otter board, and the net spacing; The propeller rotation speed and rudder angle, towing horse power, fishing boat and fishing gear position based on position measurement equipment, ground speed and water speed are set. An input screen for input is displayed on the monitor, and operating conditions are input according to the display instructions. Alternatively, information from various devices may be automatically input sequentially.

  Based on the above-mentioned fishing boat conditions and these operating conditions, the load of the fishing winch and wire rope being operated and the load of the main engine can be automatically calculated by a computer, and the catch during the operation can be calculated. It is possible to prevent accidents that occur due to overload. For this reason, for example, when the main engine is about to become overloaded, this program has an overload prevention means that automatically lowers the engine speed and adjusts the winding speed and rudder angle of the wire rope. It may be provided.

  Reference numeral 25 denotes natural condition setting means for setting the water temperature, the tidal current direction / velocity, the ocean current direction / velocity, the wave height / wavelength / cycle, and the wind direction / velocity for the wind for the natural environment during operation. An input screen for input is displayed on the monitor, and natural conditions are input according to the display instructions. Alternatively, information from various devices provided on the ship and weather information obtained from others may be automatically and sequentially updated. Note that the speed required for calculating the moving speed of fishing nets, etc. as an environmental condition may be the same as the speed calculated from the speed of the fishing boat against the water or the speed of the propeller and the propeller pitch. You may add tidal current and ocean current to this. If the course of the ship is parallel to the direction of the tide or ocean current, it is possible to use the ground speed as the flow velocity.

  Reference numeral 26 denotes a knot part / leg / attachment relative position calculating means, which is a net condition set by the mesh condition setting means 20, an accessory condition set by the accessory condition setting means 21, and an environmental condition setting means 22. Based on the environmental conditions set by the fishing boat conditions, the fishing boat conditions set by the fishing boat condition setting means 23, the operating conditions set by the operating condition setting means 24, and the natural conditions set by the natural condition setting means 25. The relative position of each arbitrary nodule / leg and the fishing boat over time of each accessory is calculated.

  Reference numeral 27 denotes fishing net shape calculation means, which specifies a fishing net shape at an arbitrary time based on the calculation result of the knot portion / leg / attachment relative position calculation means 26.

  The environmental conditions, operating conditions, and natural conditions determine the flow speed and direction of the nets and accessories in the water and in the air, while the speed and direction of the fishing boat are also determined, so that the relative positions and attachments of the knots and legs of the fishing net to the fishing boat The relative position of the tool will be calculated by the computer. Fishing nets and accessories are towed by fishing boats so that their position on the earth moves, but the relative position to the fishing boat can be calculated by the calculation method used in the present invention, assuming that the fishing boat does not move. It is.

  It is also possible to calculate the catch by comparing the propeller slip against the ground speed and the water speed and comparing the wire rope load with the unloaded condition. May be provided.

  Reference numeral 28 denotes a nodule / leg / attachment tension calculating means for calculating the tension of each arbitrary nodule / leg of the mesh and the accessory over time.

  29 is a fishing net / attachment display output means for displaying the shape of the fishing net and the position of the accessory specified by the fishing net shape calculating means 27 and the nodule / leg / attachment relative position calculating means 26 as an image on a monitor in three dimensions. To do. Compare the relative positions of fishing nets and accessories calculated by a computer with the positions of fishing boats and gears based on position measurement equipment. If the error is large, use the values based on the position measurement equipment for the position of the fishing equipment. Position correction means to be provided may be provided in this program.

  A tension display output unit 30 displays the calculated nodule / leg tension and accessory tension on the monitor as images. Note that the color of the tension display may be changed depending on the strength of the tension. Further, as described above, in order to prevent overload and the like, the calculated catch amount and specific ship maneuvering / operation instructions may be displayed on the screen based on the overload prevention means and the catch amount calculation means.

  Next, the flow of the program will be described based on the flowchart of FIG.

  In the input step (S21) for displaying the input screen on the monitor, items necessary for the simulation of the fishing net shape are sequentially input. First, in the net condition input setting step (S22) for displaying the net condition setting input screen, for the net to be simulated, the thickness of the net thread, the length of the net legs, the size of the knot, Enter the size, the specific gravity of the netting material, the compaction, the angle of the netting legs, the additional mass coefficient, and the drag coefficient. These may be input and set each time, but a reference value may be prepared for each item in advance and selected on the screen.

  Next, in the accessory condition setting step (S23) for displaying an accessory condition setting input screen, the accessory condition is input in order to set the type of accessory to be used and the physical condition corresponding to the type. Let The accessories vary depending on the type of fishing gear used, for example, trawl net, stabbed net, winding net, stationary net, etc., so input screens for floats, sinks, ropes, metal fittings, wires, etc. will be displayed depending on the type of fishing gear Display and input size (length / thickness), volume, weight, projected area, shape, specific gravity, etc. These may be input and set each time, but a reference value may be prepared for each item in advance and selected on the screen.

  In addition, in the environmental condition input setting step (S24) for displaying an input screen for setting environmental conditions, fluid density, flow direction and flow velocity are input in order to set the moving speed and resistance of the net in water. The flow direction / velocity may be automatically calculated based on the ship speed, tidal current, etc. as will be described later. In any case, any information that can be used as the flow direction / flow velocity may be input.

  Further, in the fishing boat condition setting step (S25) for displaying the input screen for setting the fishing boat conditions, the fishing winch capacity, wire rope thickness and length, fishing boat size and main engine output Enter the fishing boat conditions to set the propeller pitch. Note that these items are not necessary directly for the simulation of the mesh shape, and can be omitted for the purpose of simply simulating the mesh shape.

  Next, in the operation condition setting step (S26) for displaying the operation condition setting input screen, the wire rope feed length and speed of the fishing winch, the winding length, the winding speed and angle, the tension, and the otter board for the fishing boat in operation. The operating conditions are entered to set the spacing and net spacing of the widening members, etc., fishing boat propeller rotation speed and rudder angle, towing horse power, fishing boat and gear position based on position measurement equipment, ground speed and water speed . Alternatively, information from various devices may be automatically input sequentially without manual input by screen display. In addition, it is possible to simulate the mesh shape without necessarily setting and inputting all of these items.

  Then, in the natural condition setting step (S27) for setting natural conditions, in order to set the water temperature, the flow direction / velocity of the tidal current, the wave height / wavelength / cycle for the wave, and the wind direction / velocity for the wind for the natural environment in operation. Let the natural conditions be entered. Alternatively, information from various devices provided on the ship and weather information obtained from others may be automatically and sequentially updated without manual input by screen display. In addition, it is possible to simulate the mesh shape without necessarily setting and inputting all of these items.

  Note that any of the above net conditions, accessory conditions, environmental conditions, fishing boat conditions, operating conditions, and natural conditions may be performed first, and these input screens can be displayed at any time according to various simulation conditions. The setting conditions can be changed. In addition, as described above, the operation conditions and natural conditions may be automatically input and updated with information from various other devices.

  In the condition setting determination step (S28) for determining whether or not necessary conditions have been input, if the conditions necessary for performing the simulation are set and input, the process proceeds to the next calculation step and the condition setting is insufficient. Or, when it is determined that it is wrong, a necessary input screen is displayed again to correct the setting item.

  When conditions necessary for the simulation are set and inputted, the network conditions set in the network condition input setting step (S22), the accessory condition setting step (S23), and the environmental condition input setting step (S24). The environmental conditions set in step 1, the fishing boat conditions set in the fishing boat condition setting step (S25), the operating conditions set in the operating condition setting step (S26), and the natural conditions set in the natural condition setting step (S27). Based on the conditions, calculate the relative position and tension between each arbitrary nodule and leg of the net and the fishing boat over time of each accessory, and based on these calculation results, the shape of the fishing net and the position of the accessory The tension is specified by calculating in the fishing net shape / attachment calculation step (S29).

  In addition, the flow rate and direction of fishing nets and accessories in water and in the air are determined by the operating conditions and natural conditions, while the speed and direction of the fishing boat are also determined, so that the relative position of the fishing net nodes and legs relative to the fishing boat and the accessories Will be calculated by the computer.

  Once the fishing net shape, accessory position and tension are calculated in the fishing net shape / attachment calculation step (S29), the fishing net / attachment screen display output step (S30) outputs the processed and displayed images for arbitrary time. The shape and tension of the fishing net and the position and tension of the accessory are output as images on the monitor, and the shape and tension of the fishing net and the position and tension of the accessory are displayed on the monitor in the fishing net / accessory image display step (S31). Display so that it can be visually perceived in dimensions. Note that the display color of each leg, each knot, and each accessory may be changed depending on the strength of the tension so that the strength of the tension can be recognized immediately.

  A fishing control system for visually displaying the status of fishing during fishing using a computer will be described with reference to FIG.

  The present invention uses a computer incorporating the fishing simulation program described in the third embodiment, and further inputs information from a fish finder, scanning sonar, etc. to the computer, comprehensively grasps the fishing situation and is appropriate. Measures can be taken automatically or manually. Since the fishing simulation program used in the fishing control system is the same as that in the third embodiment, the components unique to the system will be described below.

  31 is a fish exploration / fish collection information setting means. Regarding the fish exploration / fish collection information in operation, the fish finder and seafloor information based on the fish detector, the sonar information based on the scanning sonar, the fish collection information such as the fish collection light and the flow thing, etc. Set. The flow object is a concept including both an artificial flow object and a natural flow object. Information on fish school information and sonar information is automatically input to the system. The fish collection information may be automatically input to the present system in conjunction with various switch operations, or may be manually input according to the display on the input screen.

  Reference numeral 32 denotes a fish school display output means for displaying fish finder and sea bottom information by a fish finder and sonar information by scanning sonar as a two-dimensional or three-dimensional image.

  33 is an image composition means, which combines the simulation image of the fishing net / attachment by the fishing net / attachment display output means 29 and the fish image by the fish display output means 32 and displays them simultaneously in three dimensions. The state of fish gathering in and around the fishing net will be displayed. Furthermore, it is possible to visually confirm the shape of the fishing net depending on how the fish enter.

  In addition, the shape of the fishing net can be confirmed by simulation, and the information on the fish around the actual fishing net can be confirmed by a fish finder or sonar. An automatic operation adjusting means for making it possible may be provided in this program. This is possible because the shape of the fishing net at the present time, as well as the shape of the fishing net after the change when the boat maneuvering is changed, can be simulated in advance.

  In addition, fish information such as fish detectors is input to overload prevention means that prevent fishing equipment such as winches and main engines from being overloaded due to automatically updated natural conditions and operating conditions, Further, a safe operation management means that automatically performs an appropriate measure or instructs a ship maneuvering method by a warning may be provided in the program. The appropriate measures include changes in courses, rudder angles, and speeds normally used in ship operations, operation adjustments of various auxiliary machinery such as main engines, generators, boilers, pumps, and operation of various fishing machines, Includes adjustments.

  Next, the flow of the fishing control system will be described based on the flowchart of FIG. Since it is basically the same as the fishing simulation program described in the third embodiment, only the parts unique to this system will be described below.

  In the fish / fish school information setting step (S31) for displaying the input screen for setting the fish-finding / fish collection information, for the fish / fish collection information in operation, the fish finder based on the fish finder and the seabed information, the sonar based on the scanning sonar In order to set information, fish collection information such as fish light and flow objects, fish search and seabed information, sonar information, and fish collection information are input and set. It should be noted that the fish finder, seabed information and sonar information are automatically input to the system. In addition, fish collection information may be automatically input to the system in conjunction with operations using various switches on the ship, or may be manually input according to the display on the input screen.

  In the fish display display step (S32) for processing and outputting the fish for image display, the fish information based on the fish finder and sea bottom information by the fish finder and the sonar information by the scanning sonar is displayed as an image in two or three dimensions. Output to.

  Then, when the fishing net shape and each accessory position and tension are calculated in the fishing net shape / attachment calculation step (S29), the fishing net / attachment screen display output step (S30) outputs the processed and displayed images. The image composition step (the output of displaying the shape and tension of the fishing net at any time and the position and tension of the accessory as an image on the monitor and the output of displaying the fish information in the fish display output step (S32) as an image on the monitor) In S33), the simulation image of the fishing net / accessory and the fish school image are synthesized and displayed simultaneously in three dimensions.

  By combining the fish detection / fish collection / seafloor information and the simulation image, the fishing situation can be displayed and expressed more accurately. In addition, since the state of fish entering the fishing net can be confirmed specifically, the load on the fishing net, fishing equipment, and main engine can be easily confirmed visually as appropriate, so fishing work can be performed safely and efficiently. It is possible to proceed.

  By using various simulation programs according to the present invention, it is possible to virtually simulate fishing nets using a computer, greatly reducing labor, economic and time costs due to on-site observations and aquarium experiments. It is possible to easily and quickly capture information that could not be obtained in an aquarium experiment or the like, and the net fishing gear can be efficiently developed. Furthermore, the application of the present invention not only improves the efficiency of net fishing gear product development, but also serves as a powerful design support tool for the development of new fishing gear that can selectively catch only specific fish species. It can also be used for highly accurate performance evaluation.

  Further, by combining the fishing simulation program according to the present invention and the fish detection / fish collection / seabed information as a fishing control system, it is possible to check the operation status, for example, the net deployment status and the fishing status in real time. Based on this information, it is possible to optimally control the operation of the maneuvering and fishing equipment automatically or manually, which in turn contributes to the prevention, grasp and mitigation of fishing boat / fishing gear accidents during operation. In addition, the net can be set according to the fishing environment at that time, and as the catch increases, selective fishing methods become easier and resource management becomes possible.

It is a conceptual diagram of the model for calculation. It is a figure which shows the mass point arrange | positioned on a nodule, and the external force which acts on this. It is a figure which shows the mass point arrange | positioned on the leg center, and a local coordinate system. It is a figure which shows the image | video (A) in the water of a real network, and the simulation result (B) by the calculation method of this invention. It is a figure which shows the simulation result by the calculation method of this invention. It is a graph which shows the result calculated by the load which acts on the real net cloth in flowing water, and the calculation method of this invention. It is a figure which shows the example which observed the simulation result by the calculation method of this invention from arbitrary viewpoints. It is a figure which shows the example for every time passage of the simulation result by the calculation method of this invention. It is a figure which shows the example which displayed the detailed part of the mesh of the simulation result by the calculation method of this invention. It is a block diagram of a network shape simulation program. It is a flowchart of a network shape simulation program. It is a block diagram of a fishing net simulation program. It is a flowchart of a fishing net simulation program. It is a block diagram of a fishing simulation program. It is a flowchart of a fishing simulation program. It is a block diagram of a fishing rod control system. It is a flowchart of a fishing rod control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Net | network condition setting means 2 Environmental condition setting means 3 Nodule part / leg position calculation means 4 Net shape shape calculation means 5 Nodal part / leg part tension calculation means 6 Net shape shape display output means 7 Tension display output means 8 Accessory conditions Setting means 9 Knotted part / leg / attachment position calculating means 10 Knotted part / leg / attachment tension calculating means 11 Mesh shape / attachment display output means 12 Tension display output means 20 Net condition setting means 21 Accessory conditions Setting means 22 Environmental condition setting means 23 Fishing boat condition setting means 24 Operating condition setting means 25 Natural condition setting means 26 Nodal part / leg / attachment relative position calculating means 27 Fishing net shape calculating means 28 Nodule / leg / attachment tension Calculation means 29 Fishing net / accessory display output means 30 Tension display output means 31 Fish detection / fish collection information setting means 32 Fish school display output means 33 Image composition means

Claims (12)

A program for simulating a change in the shape of a net when a computer is flowing underwater and displaying it as an image,
(1) Net yarn thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Specific gravity of net material , (6) contraction, (7) angle of net legs, (8) additional mass coefficient, (9) drag coefficient setting means for setting drag coefficient,
Environmental condition setting means for setting (1) fluid density and (2) flow direction / velocity in order to set the moving speed and resistance of the net underwater,
Coordinate system transformation that evaluates the fluid force, inertial force and tension acting on the nodule / leg using a local coordinate system and derives the equation of motion for the absolute coordinate system of the nodule / leg using the coordinate system transformation matrix means,
Based on the network conditions set by the network condition setting means and the environmental conditions set by the environmental condition setting means,
Nodules / leg position calculation means for calculating the position of each arbitrary nodule / leg of the mesh with the passage of time using the coordinate system conversion means,
A net shape calculation means for specifying the net shape based on the calculation result of the nodule / leg position calculation means,
A network shape display output means for displaying the network shape specified by the network shape calculation means as an image;
A network shape simulation program characterized by functioning as In addition to claim 1, a nodule / leg tension calculating means for calculating a tension with time of each arbitrary nodule / leg of the network,
Tension display output means for displaying the calculated leg tension and knot tension as images,
A network shape simulation program characterized by functioning as   The network shape simulation program according to claim 2, wherein the color of the tension display is changed depending on the strength of the tension. A program for simulating changes in fishing nets when a computer is flowing underwater and displaying it as an image,
(1) Net yarn thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Specific gravity of net material , (6) Constriction, (7) Angle of net legs, (8) Additional mass coefficient, (9) Drag coefficient coefficient setting means for setting drag coefficient,
Accessory condition setting means for setting the type of accessory to be used and physical conditions according to the type,
Environmental condition setting means for setting (1) fluid density and (2) flow direction / velocity to set the moving speed and resistance of the net and accessories in water
Coordinate system transformation that evaluates the fluid force, inertial force and tension acting on the nodule / leg using a local coordinate system and derives the equation of motion for the absolute coordinate system of the nodule / leg using the coordinate system transformation matrix means,
Based on the network conditions set by the network condition setting means, the accessory conditions set by the accessory condition setting means, and the environmental conditions set by the environmental condition setting means,
Nodules / legs / attachment position calculating means for calculating the position of each arbitrary nodule / leg of the mesh with the passage of time using the coordinate system conversion means,
A net shape calculation means for specifying the net shape based on the calculation result of the nodule, leg, and accessory position calculation means,
A mesh shape / attachment display output means for displaying the mesh shape and attachment position specified by the mesh shape calculation means and the nodule / leg / attachment position calculation means as an image,
A fishing net simulation program characterized by functioning as In addition to claim 4, the computer calculates a knot part / leg / attachment tension calculating means for calculating the tension of each arbitrary knot part / leg part of the mesh and the accessory over time,
Tension display output means for displaying the calculated leg tension, knot tension and accessory tension as images,
A fishing net simulation program characterized by functioning as   6. The fishing net simulation program according to claim 5, wherein the color of the tension display is changed depending on the strength of the tension. This is a program for simulating the fishing situation during fishing on a computer and displaying it as an image.
About nets used for fishing (1) Net thread thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Net material specific gravity, (6) Constriction, (7) Angle of net legs, (8) Additional mass coefficient, (9) Drag condition setting means for setting drag coefficient,
Accessory condition setting means for setting the type of accessory used and the physical condition according to the type,
Environmental condition setting means for setting (1) fluid density and (2) flow direction / velocity, in order to set the moving speed and resistance of nets and accessories during fishing.
Coordinate system transformation that evaluates the fluid force, inertial force and tension acting on the nodule / leg using a local coordinate system and derives the equation of motion for the absolute coordinate system of the nodule / leg using the coordinate system transformation matrix means,
Fishing boat condition setting means for setting the fishing winch capacity and wire rope thickness and length, fishing boat size and main engine output and propeller pitch for the fishing boat used for operation,
For fishing boats in operation, the length and speed of the wire rope of the fishing winch, the winding length, the winding speed and angle, the tension, the spacing and net spacing of the widening members such as otter boards, the propeller rotation speed and rudder angle of the fishing boat, towing Operation condition setting means for setting horsepower, fishing boat and fishing gear position based on position measurement equipment, ground speed and water speed,
Natural condition setting means for setting the water temperature, tidal current direction / velocity, wave height / wavelength / cycle, wave direction / velocity for the natural environment during operation,
The net conditions set by the net condition setting means, the accessory conditions set by the accessory condition setting means, the environmental conditions set by the environmental condition setting means, and the fishing boat conditions set by the fishing boat condition setting means And based on the operating conditions set by the operating condition setting means and the natural conditions set by the natural condition setting means,
Nodule part / leg / attachment relative position calculating means for calculating the relative position of each arbitrary nodule part / leg part of the net and the fishing boat with the passage of time of each accessory using the coordinate system conversion means,
Fishing net shape calculation means for specifying the shape of the fishing net based on the calculation results of the nodule, leg and accessory position calculation means;
Fishing net / attachment display output means for displaying the shape of the fishing net and the position of the accessory identified by the fishing net shape calculating means and the nodule / leg / attachment relative position calculating means,
Fishing simulation program characterized by functioning as In addition to claim 7, the computer calculates a knot portion / leg / attachment tension calculating means for calculating the tension of each arbitrary knot portion / leg portion of the mesh and the accessory over time,
Tension display output means for displaying the calculated leg tension, knot tension and accessory tension as images,
Fishing simulation program characterized by functioning as   9. The fishing simulation program according to claim 8, wherein the color of the tension display is changed according to the strength of the tension. A system for visually displaying fishing conditions during fishing using a computer on an arbitrary image display device,
About nets used for fishing (1) Net thread thickness, (2) Net leg length, (3) Nodule size, (4) Net size, (5) Net material specific gravity, Net condition setting means for setting (6) condensation, (7) angle of net legs, (8) additional mass coefficient, (9) drag coefficient,
An accessory condition setting means for setting the type of accessory used and the physical condition corresponding to the type;
Environmental condition setting means for setting (1) fluid density, (2) flow direction / velocity, in order to set the moving speed and resistance of the nets and accessories during fishing;
Coordinate system transformation that evaluates the fluid force, inertial force and tension acting on the nodule / leg using a local coordinate system and derives the equation of motion for the absolute coordinate system of the nodule / leg using the coordinate system transformation matrix means,
Fishing boat condition setting means for setting fishing winch capacity and wire rope thickness and length, fishing boat size and main engine output and propeller pitch for the fishing boat used for operation;
For fishing boats in operation, the length and speed of the wire rope of the fishing winch, the winding length, the winding speed and angle, the tension, the spacing and net spacing of the widening members such as otter boards, the propeller rotation speed and rudder angle of the fishing boat, towing Operation condition setting means for setting horsepower, fishing boat and fishing gear position based on position measuring equipment, ground speed and water speed,
Natural condition setting means for setting the water temperature, tidal current direction / velocity, wave height / wavelength / period, wave direction / velocity for the natural environment during operation,
Fish detection / fish collection information setting means for setting fish detection and sea bottom information based on a fish finder, sonar information based on a scanning sonar, and fish collection information such as a light collection lamp and flow objects, etc. ,
The net conditions set by the net condition setting means, the accessory conditions set by the accessory condition setting means, the environmental conditions set by the environmental condition setting means, and the fishing boat conditions set by the fishing boat condition setting means And based on the operating conditions set by the operating condition setting means, the natural conditions set by the natural condition setting means, and the fish exploration / fish collection information set by the fish exploration / fish collection information setting means,
Nodule / leg / attachment relative position calculating means for calculating the relative position between each arbitrary nodule / leg of the net and the fishing boat with the passage of time of each accessory using the coordinate system conversion means ;
Fishing net / attachment display output means for displaying the shape of the fishing net and the position of the accessory identified by the fishing net shape calculating means and the nodule / leg / attachment relative position calculating means;
Fish display by means of fish finder and sea bottom information and sonar information by scanning sonar information are displayed as an image, and a fish net / output simulation means by fish net / accessories display output means and by fish display output means A fishing rod control system characterized in that a fish school image is synthesized by an image synthesizing means and displayed simultaneously. In addition to claim 10,
A knot part / leg / attachment tension calculating means for calculating the tension with time of each arbitrary knot part / leg part of the mesh and each accessory,
Tension display output means for displaying the calculated leg tension, knot tension and accessory tension as images,
A fishing rod control system characterized by comprising The fishing rod control system according to claim 11, wherein the color of the tension display is changed depending on the strength of the tension.

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