JP4465456B2 - Centrifugal model experiment equipment - Google Patents

Description

  The present invention, for example, reproduces the stress state of a real model by applying a centrifugal acceleration N times the gravitational acceleration to a small model reduced to 1 / N of the real model. The present invention relates to the improvement of a centrifuge model experimental apparatus that can accurately grasp the on-site behavior by observing the typical behavior.

  Conventionally, in fields such as soil engineering and ground engineering, attempts have been made to accurately predict ground behavior by using a centrifugal model experimental device. As shown in FIG. 13, the schematic configuration of the centrifugal model experimental apparatus is such that the sample container 202 is suspended and rotated at both ends of the rotating arm 201, and the rotating arm 201 is rotated at a high speed (for example, from 20 revolutions to 150 revolutions per minute). The sample container 202 swings up in the direction of the combined acceleration of the earth's gravitational acceleration and centrifugal acceleration. At this time, the gravity is sufficiently smaller than the centrifugal force, so that the combined acceleration works substantially in the horizontal direction, and the horizontal state of the sample container 202 is maintained when the rotating arm 201 rotates at a high speed. If a small model ground is prepared in advance in the sample container 202, a centrifugal force acts vertically downward of the small model ground, and gravity acceleration is applied to the small model ground reduced to 1 / N of the actual size. By giving N times the centrifugal acceleration, the real stress state can be reproduced on the small model ground. By observing the static or dynamic behavior that occurs on the small model ground at this time, it becomes possible to accurately grasp the behavior in the field.

  The model experiment using the centrifugal model experiment apparatus as described above can be performed indoors, and also has the advantage that it can be performed at a lower cost and more frequently than on-site experiments. It is used for a wide variety of studies such as stability problems, settlement problems, and behaviors during earthquakes. In recent years, it is also used for research on the interaction between waves and structures, the diffusion problem of pollutants, plate tectonics, etc. ing.

  However, the conventional centrifugal model experimental device described above uses electric power for operating a sensor such as a strain gauge used to measure microscopic behavior in a small model ground with respect to a rotating arm 201 that rotates at high speed. There is a structural problem in that it is necessary to supply, supply hydraulic oil consumed by the rotary arm 201, and to take out the data obtained from the sensor or the like and record and hold it. It was.

  Conventionally, the exchange of power and information inside and outside the rotating system is performed through a slip ring attached to the rotating shaft, and the slip ring has a brush in contact with the outside of the ring attached to the rotating shaft. A mechanism was adopted in which a current, an electric signal, or the like is flowed in and out of the rotating system.

  However, slip rings for supplying electric power from the outside are expensive and have a problem that management for normal operation is difficult because of the structure for transmitting electric power by sliding metal. . Furthermore, the slip ring has a restriction in terms of current flow rate.

  On the other hand, for the hydraulic pressure consumed by the rotary arm 201, a method of supplying from the outside via a rotary joint has been adopted. However, the rotary joint is limited in terms of flow rate when flowing high-pressure hydraulic oil, and in the centrifugal model experimental apparatus according to the prior art, the supply of hydraulic oil to the rotary arm 201 from the external hydraulic source is There was a problem that it could only be done in small amounts. Moreover, since the rotary joint has a structure in which the seal portion is slid and sealed, there is a problem that maintenance is very troublesome.

  As a method for solving such problems of the rotary joint, it is conceivable in the prior art to prepare an accumulator in the rotary arm 201 and charge this accumulator to consume a large amount of hydraulic oil instantaneously. This is not preferable because it causes a cost increase due to an increase in the number of parts.

  As another countermeasure, it may be possible to install an electric motor and an oil pump on the rotating arm 201 and to supply hydraulic pressure only inside the rotating system. However, this method has a problem that the electric motor cannot withstand centrifugal acceleration. is there.

  The present invention has been made in view of the above-described problems in the prior art that it is very difficult to supply power consumed by a rotating arm that rotates at high speed from the outside. The purpose of the invention is to provide a completely new centrifugal model experimental apparatus that obtains power to be consumed by a rotating body by utilizing the power of a rotating arm that rotates.

Centrifugal model experiment apparatus Ru engaged to the present invention includes a central shaft which is rotated driven rotatably installed as rotate around the axis while being erected in a vertical direction, formed to extend in the horizontal direction and linearly from the central axis And a rotary arm that rotates according to the rotational drive of the central axis and is tiltably mounted on the rotary arm so as to swing up in the direction of the combined acceleration of gravity acceleration and centrifugal acceleration when the rotary arm rotates. A centrifugal model experimental apparatus comprising: a platform configured as described above; and a rotational drive source that exerts rotational drive force on the central axis, wherein the oil pump generates hydraulic pressure, and the pinion gear installed in the oil pump And an annular rack gear that meshes with the pinion gear, and is configured such that the annular center of the rack gear and the axis of the central axis coincide with each other. Rukoto by the pinion gear when said rotary arm is rotated movement, characterized in that to drive the oil pump by rotating on the rack gear.

In centrifugal model experiment apparatus engaged Ru in the present invention, the oil pump is disposed on the rotary arm, by the rack gear is installed such that the immobility, the pinion gear when said rotary arm is rotated motion Is preferably configured to revolve while rotating on the rack gear.

Further, centrifugal model experiment apparatus engaged Ru in the present invention, when the composite acceleration is the platform is raised swing by acting substantially in the horizontal direction, provided with a fixing means for fixing and holding the platform with respect to the rotary arm The fixing means may be driven using hydraulic pressure generated by the oil pump.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the new centrifuge model experimental apparatus which cannot supply internal consumption power with the simple and cheap structure with respect to the rotating arm which rotates at high speed. Since this power is obtained by utilizing the rotational motion of the rotary arm, it is very efficient. Further, the type of power obtained can be at least one of hydraulic pressure, electric power, and compressed air, and in particular, hydraulic pressure can be supplied with a large flow rate of hydraulic oil that has been difficult to achieve with the prior art. It is possible to realize a desired hydraulic pressure supply to the rotating arm that is a rotating body.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in each embodiment are essential to the solution means of the invention. Not exclusively.

  In each embodiment described below, when the rotating arm rotates in association with the rotation of the central axis by the motor as the rotation drive source, the power generation means for generating power using this rotation is provided. In the following description, an example of a hydraulic pressure generation mechanism including an oil pump, a pinion gear, and a rack gear will be described.

(First embodiment)
FIG. 1 is a front view illustrating a schematic configuration of the centrifugal model experimental apparatus according to the first embodiment, and particularly shows a state where the rotating arm is not rotating. On the other hand, FIG. 2 is a front view illustrating a schematic configuration of the centrifugal model experimental apparatus according to the first embodiment, and particularly shows a state where the platform is swung up in a substantially horizontal direction by rotating the rotating arm at a high speed. ing.

  As shown in FIGS. 1 and 2, the centrifugal model experimental apparatus according to the first embodiment is installed on the central shaft 11, the rotating arm 21, and the rotating arm 21 so as to be tiltable as main components. A platform 41 and a motor 41 as a rotational drive source that exerts rotational drive force on the central shaft 11 are provided.

  The central shaft 11 is a member that is erected in the vertical direction and is rotatably installed with the shaft center as a rotational center. The rotational driving force is applied by a motor 41 connected via a speed reducer 42. The The upper and lower shaft ends of the central shaft 11 are pivotally supported by a number of bearings, and stable and reliable rotational motion of the central shaft 11 is realized by these bearings.

  A slip ring 12 is installed at the shaft end above the central shaft 11. The slip ring 12 is a member that enables communication with a sensor or device attached to the rotating arm 21 that is a rotating body, power supply to the rotating arm 21 that rotates at high speed, and the like. Wires are connected by bringing a brush into contact with the outside of the attached ring, and electrical signals, currents, and the like can be exchanged between the inside and outside of the rotating system such as the rotating arm 21.

  The rotary arm 21 is a member formed to extend from the central axis 11 in a horizontal direction and linearly, and can rotate according to the rotational drive of the central axis 11. Since this rotational motion is performed at a very high speed, the rotary arm 21 is configured as a structure having rigidity that can sufficiently receive a large centrifugal force.

  The rotating arm 21 includes a pair of platforms 31a and 31b that are tiltably installed on both sides thereof. These platforms 31a and 31b are members configured to swing up in the direction of the combined acceleration of gravity acceleration and centrifugal acceleration when the rotating arm 21 rotates. Since the gravity is sufficiently smaller than the centrifugal force, the resultant acceleration acts in a substantially horizontal direction. Therefore, when the rotary arm 21 rotates at a high speed, both the pair of platforms 31a and 31b swing up so as to maintain the horizontal state as shown in FIG.

  A sample container 32 can be installed on one platform 31a. By maintaining the horizontal state of the platform 31a, the small model ground formed in the sample container 32 is centrifuged vertically downward. For example, by applying a centrifugal acceleration N times the gravitational acceleration to a small model ground reduced to 1 / N of the actual size, it becomes possible to reproduce the actual stress state on the small model ground. .

  Further, a counterweight 33 can be installed on the other platform 31b, so that a balanced state of the weight balance of the rotating arm 21 rotating at high speed can be maintained.

  The centrifugal model experimental apparatus according to the first embodiment has the schematic configuration as described above, but includes a hydraulic pressure generating mechanism 51 as a further preferable feature. As illustrated in FIGS. 1 and 2, the hydraulic pressure generating mechanism 51 can be installed, for example, on the lower side of the rotating arm 21. By using the hydraulic pressure generating mechanism 51, the rotating arm 21 that rotates at a high speed. On the other hand, a large flow rate of hydraulic oil can be supplied with a simple and inexpensive configuration, and a desired hydraulic pressure can be supplied. Therefore, a specific configuration of the hydraulic pressure generating mechanism 51 will be described with reference to FIGS. 3 and 4. Here, FIG. 3 is a conceptual diagram for explaining the components and operating principles of the hydraulic pressure generating mechanism according to the first embodiment, and FIG. 4 is a centrifuge model experimental apparatus according to the first embodiment. It is a figure which illustrates the installation method of the hydraulic pressure generation mechanism with respect to.

  As shown in more detail in FIGS. 3 and 4, the hydraulic pressure generating mechanism 51 according to the first embodiment includes an oil pump 52 for generating hydraulic pressure, a pinion gear 53 installed in the oil pump 52, An annular rack gear 54 that meshes with the pinion gear 53 is formed.

  The oil pump 52 is installed on the rotary arm 21 that rotates at a high speed, and is configured to circulate around the axis center of the central shaft 11 with the rotational movement of the rotary arm 21. In addition, a pinion gear 53 is installed in the oil pump 52 in a rotatable state, and the oil pump 52 is activated by the rotational movement of the pinion gear 53, and a flow of hydraulic oil with pressure is created. become.

  On the other hand, the annular rack gear 54 is a member that is fixedly installed so as to be in an immobile state. For example, the annular rack gear 54 is fixedly installed on a stable base portion 55 such as a bearing box that pivotally supports the lower shaft end of the central shaft 11. Is preferable. The rack gear 54 is installed in a positional relationship such that the annular center of the ring coincides with the axis of the central shaft 11. By having such a configuration, when the rotary arm 21 rotates, the pinion gear 53 connected to the oil pump 52 revolves while rotating on the rack gear 54. That is, when the rotary arm 21 rotates, the pinion gear 53 rotates on the rack gear 54 to drive the oil pump 52. Therefore, the hydraulic pressure generating mechanism 51 uses the rotational motion of the rotary arm 21. It is possible to realize a desired hydraulic pressure supply by an efficient method.

  In the centrifugal model experimental apparatus according to the first embodiment, when the platform 31 is swung up due to the combined acceleration acting in a substantially horizontal direction, the platform 31 is fixed to hold the platform 31 with respect to the rotary arm 21. Means 22 are provided. For the fixing means 22, it is preferable to employ, for example, a pressing mechanism that is driven by hydraulic pressure and presses the platform 31 toward the center of rotation, or a chuck mechanism that mechanically holds the platform 31. For the hydraulically driven fixing means 22, it is preferable to use the hydraulic oil supplied by the oil pump 52 described above. Such a mechanism can be realized for the first time by adopting a hydraulic pressure generating mechanism 51 that can supply a large flow rate of hydraulic oil to the rotating arm 21 that rotates at a high speed. It is very difficult to fix and hold a heavy object to which acceleration is applied with a conventional hydraulic pressure supply mechanism using a rotary joint.

  The specific configuration of the centrifugal model experiment apparatus according to the first embodiment has been described above. Next, a method for observing a small model ground using the centrifugal model experimental apparatus according to the first embodiment will be described.

  As shown in FIGS. 1 and 2, the centrifugal model experimental apparatus according to the first embodiment is installed in a cylindrical space that is substantially the same as or slightly larger than the rotational radius of the rotary arm 21. A small window (not shown) for observing from the outside is provided on the side wall of the space. The macroscopic behavior of the rotating sample container 32 can be observed by photographing from this small window using a camera.

  When the number of rotations is large, the camera can be placed on the rotating arm 21 and the camera and the small model ground can be rotated simultaneously to take a picture. However, since the centrifugal force also acts on the camera when the rotational speed is high, it is preferable to install a small camera that requires a small centrifugal force.

  On the other hand, a sensor such as a strain gauge may be used to measure the microscopic behavior of the small model. In this case, when a current is passed through the small model, if the small model is distorted, the electrical resistance changes, and the voltage changes accordingly. By examining the change in voltage at this time, strain, that is, deformation in the small model can be indirectly measured. Therefore, according to the centrifuge model experimental apparatus according to the first embodiment, the behavior occurring in the small model can be observed stably, so that the behavior in the field can be accurately grasped.

(Second Embodiment)
In the first embodiment described above, an improvement of a general centrifugal model experiment apparatus used in model experiments in fields such as soil engineering and ground engineering has been described. In the second embodiment to be described next, a model water channel is completed when the platform is swung up in a substantially horizontal direction, and the effect of a tsunami caused by an earthquake is simulated using this model water channel. An explanation will be given of a centrifugal model experimental device configured as a seismic tsunami experimental device. In addition, about the member which is the same as that of the member demonstrated in 1st Embodiment, or similar, the same code | symbol may be attached | subjected and description may be abbreviate | omitted.

  Here, FIG. 5 is a front view showing a state before rotation of the centrifugal model experimental apparatus according to the second embodiment, and FIG. 6 is a state before rotation of the centrifugal model experimental apparatus according to the second embodiment. It is a top view which shows the state.

  As shown in FIGS. 5 and 6, the centrifugal model experiment apparatus according to the second embodiment is installed on a fixed floor 70, and includes a motor 61, a central shaft 62, a rotating arm 63, and a model water channel. A section 64, a platform 65, and a simulated land area section 66 are provided.

  A power supply (not shown) is connected to the motor 61 so that the motor shaft 61a can be driven to rotate. The motor shaft 61a is connected to the speed reducer 69 and rotates the center shaft 62 around the rotation center line A1. The rotation center line A1 is an imaginary straight line in the vertical direction in FIG.

  A rotation arm 63 is attached to the center shaft 62. The rotating arm 63 is rotationally driven by the central shaft 62. A central support portion 63 a that has a substantially disk shape and is attached to the central shaft 62 is installed at the central portion of the rotary arm 63. Radiating arm portions 63b1 to 63b8 are attached from the outer peripheral portion of the center support portion 63a so as to protrude radially outward. The number of radiating arm portions is eight in FIG. 6, but the number is not limited and may be any number. Further, a substantially annular support ring portion 63c is provided so as to connect adjacent radiating arm portions.

  A model water channel portion 64 is attached to the outer peripheral portion of the rotating arm 63. The model water channel portion 64 is formed in a substantially annular shape as a whole. Further, the circularly symmetric center line of the model water channel portion 64 and the rotation center line A1 of the center shaft 62 are installed so as to coincide with each other.

  The model water channel portion 64 includes a bottom plate portion 64a and a pair of side plate portions 64b and 64c. With such a configuration, when the bottom plate portion 64a is viewed as a lower bottom portion, the cross-sectional shape is substantially bowl-shaped, and a recess 64d is formed inside.

  Note that, in the model water channel portion 64 corresponding to the platform 65, the upper side plate portion 64e of the model water channel portion 64 is provided in the same manner as the side plate portion 64b, but the lower side plate of the model water channel portion 64 is provided. The part 64f has a configuration that can be opened and closed by a slide mechanism or the like by a drive mechanism (not shown). In the state before the rotation of the centrifugal model experimental device according to the second embodiment configured as an earthquake tsunami experimental device, For example, it is drawn in by sliding movement toward the front side or the back side of the paper in FIG. 5, an opening is formed, and the concave portion of the model water channel portion at that location is a land area storage space 68.

  Further, the platform 65 suspends and supports, for example, the left and right sides or four corners of the plate-shaped base plate portion 65a with the suspension member 65b, and the upper end of the suspension member 65b is connected to the rotary arm 63, for example, the rotation hinge portion 67. It is attached to the support ring part 63c etc. so that rotation is possible. For example, the rotation hinge portion 67 is configured such that a columnar member 67b is fixed to the support ring portion 63c side, and a cylindrical member 67a is attached so as to be able to rotate by being fitted to the member 67b. The upper end of the suspension member 65b is fixed to the cylindrical member 67a. In addition, the structure of the rotation hinge part 67 may be reverse to the above (the structure in which the rotating part is a central cylindrical part).

  With such a configuration, the platform 65 has a rotation center line of the rotation hinge part 67 (a virtual straight line that passes through the center point of the rotation hinge part 67 in FIG. 5 and extends from the front of the sheet of FIG. 5 toward the back of the sheet). It is possible to turn around.

  In addition, a simulated land area portion 66 is installed on the base plate portion 65 a of the platform 65. The simulated land area 66 has a configuration as shown in FIG. That is, it has a simulated ground part 106 configured to contain soil, sand, or a mixture thereof, and on the simulated ground part 106, the breakwater model 100, the quay model 101, the house model 104, the building model 105, or these A structural model composed of an appropriate combination of the above is arranged.

  The centrifugal model experimental apparatus according to the second embodiment having the above-described configuration also includes the oil pump 52, the pinion gear 53, and the rack gear 54 as described in the first embodiment. It is preferable to provide a hydraulic pressure generating mechanism 51. The detailed configuration and operation principle are the same as in the case of the first embodiment described with reference to FIGS. 3 and 4 and the like, so the repetitive description is omitted, but the centrifugal model experiment according to the second embodiment is performed. Also in the apparatus, for example, as illustrated in FIG. 5, by providing the hydraulic pressure generating mechanism 51 at a position below the rotary arm 63, a desired hydraulic pressure supply to the equipment on the rotary arm 63 can be realized very efficiently. It becomes possible.

  In addition, since the centrifugal model experiment apparatus according to the second embodiment functions as an earthquake and tsunami experiment apparatus, the simulated water channel section 64 is provided with a wave making apparatus described in detail later. Also, since the hydraulic pressure can be used as a power source for the wave making device, the hydraulic pressure generating mechanism 51 exhibits a function as an effective hydraulic pressure supply source. In particular, according to the hydraulic pressure generating mechanism 51, a large flow rate of hydraulic oil can be supplied, so that, for example, by using this for a wave making device, experimental conditions that were not possible in the past can be realized, It is possible to improve the capability as a test apparatus.

  Next, an earthquake / tsunami experiment performed using the centrifugal model experiment apparatus according to the second embodiment will be described.

  First, electric power is supplied to the motor 61 to rotate it. Thereby, the central axis 62 rotates in the direction of R1 around the rotation center line A1 in FIG. 7, for example. By this rotation, the central shaft 62 rotates in the direction of R2 in FIG. As the central shaft 62 moves, the rotating arm 63 and the model water channel 64 also rotate in the same rotational direction as the central shaft 62.

  Due to this rotation, horizontal centrifugal acceleration acts on the model water channel portion 64. That is, in FIG. 7, centrifugal acceleration in the direction from the left side of FIG. 7 toward the right side of the paper surface acts on the model water channel portion 64 at the right end of FIG. 7, and the model water channel portion 64 at the left end of FIG. , Centrifugal acceleration in a direction from the right side to the left side in FIG. 7 acts.

  Accordingly, in the model water channel portion 64 at the right end of the paper surface in FIG. 7, when the bottom plate portion 64a is viewed as the lower bottom portion, the centrifugal acceleration acting on the model water channel portion 64 (from the left side of the paper surface at the right end of the paper surface in FIG. (Centrifugal acceleration in the direction) corresponds to gravitational acceleration from the top to the bottom of the bottom plate portion 64a of the model water channel portion 64. Further, when the bottom plate portion 64g is viewed as the lower bottom portion, the centrifugal acceleration acting on the model water channel portion 64 (centrifugal acceleration in the direction from the right side of the drawing to the left side of the drawing at the left end of the drawing in FIG. This corresponds to the gravitational acceleration from the top to the bottom of the bottom plate portion 64g.

  Further, due to the centrifugal force accompanying the rotation of the rotary arm 63, the platform 65 rotates in the direction of D1 in FIG. As a result, the simulated land area 66 on the base plate portion 65a also rotates together, and when the entire platform 65 is in a substantially horizontal state, the base plate portion 65a and the simulated land area 66 are accommodated in the land area portion. It is accommodated in the space 68. In this case, for example, one end portion 106 a of the simulated ground portion 106 (see FIG. 10) faces the one end portion 68 a of the land region receiving space 68, and the other end of the land region receiving space 68. The other end portion 106b of the simulated ground portion 106 is opposed to the end portion 68b side.

  At this time, the portion of the side plate portion 64f on the lower side of the model water channel portion 64 is configured to be opened and closed by a slide movement or the like by a drive mechanism (not shown), and the centrifugal model experimental apparatus is rotated, and the simulated land area portion In a state after 66 is accommodated in the land area accommodating space 68, for example, the opening is closed by sliding to the front side or the back side in FIG.

  Further, for example, a water supply device 74 and a water supply pipe 75 are provided inside the rotary arm 63. The water supply device 74 includes a tank for storing water (not shown) and a pump. The water supply pipe 75 is installed so that one end is connected to the pump and the other end is located in the vicinity of the recess 64 a of the model water channel portion 64. With such a configuration, after the centrifugal model experimental device rotates and reaches a predetermined rotational speed, water is supplied to the substantially bowl-shaped recess 64a of the model water channel portion 64 by the water supply device 74 and the water supply pipe 75. The

  In this case, since the centrifugal acceleration as described above acts on the model water channel portion 64, the water supplied to the concave portion 64a is in close contact with the concave portion 64a as indicated by reference numeral 76 in FIG. As a result, when the centrifugal model experiment apparatus is rotating at a predetermined speed, in the model water channel portion 64 at the right end of the page of FIG. 7, the bottom plate portion 64a becomes the lower bottom portion, and water 76 exists on the bottom plate portion 64a. A state in which the acceleration corresponds to the gravitational acceleration is formed. This water 76 accumulates in a portion other than the above-described model land region portion 66 in the concave portion 64 a of the model water channel portion 64.

  Further, for example, the model water channel portion 64 is provided with a wave making device, and after the centrifugal model experiment device rotates to reach a predetermined rotation speed, a wave that simulates a tsunami caused by an earthquake is converted into the simulated water region portion. The water 76 can be generated.

  (A) in FIG. 9 is a diagram illustrating a configuration example of the wave making device. In the case of the wave making device indicated by (A) in FIG. 9, the wave making device 72 </ b> A has a drive mechanism 85 and a moving plate 86. As the drive mechanism 85, a mechanism that performs linear reciprocation, for example, a mechanism that includes a cylinder and a piston and that performs linear reciprocation using hydraulic pressure, air pressure, or the like, a “slider crank” that includes a rotation drive source, a crank, and a slider. It is possible to use "mechanisms" or other known mechanisms.

  With such a configuration, the moving plate 86 can move in the direction D2 in FIG. Accordingly, the wave making device 72A can generate a wave simulating an earthquake tsunami by pressing water multiple times in the tangential direction of the circle of the simulated water area 76A.

  Moreover, it is also possible to use the thing of a structure as shown to (B) in FIG. A wave making device 72B shown in FIG. 9B includes a storage box 91 provided in the model water channel portion 64a, a drive mechanism 92, and a moving plate 93. As the drive mechanism 92, a mechanism that performs linear reciprocation, for example, a mechanism that includes a cylinder and a piston and that performs linear reciprocation using hydraulic pressure, air pressure, or the like, a “slider crank” that includes a rotation drive source, a crank, and a slider. It is possible to use "mechanisms" or other known mechanisms.

  With such a configuration, the moving plate 93 can move in the direction D3 in FIG. Accordingly, the wave making device 72B can generate a wave simulating an earthquake tsunami by simulating a depression near the bottom of the simulated water area 76B.

  As described above, waves simulating a tsunami caused by an earthquake are generated in the simulated water areas 76A and 76B. As shown in FIG. 10 (B), the simulated tsunami 111 reaches the simulated land area 66, and a structural model provided in the simulated land area 66, such as a breakwater model 100, a quay model 101, a house, and the like. Various effects of the simulated tsunami 111 are exerted on the model 104, the building model 105, the simulated ground 106, and the like.

  As shown in FIGS. 6 and 7, the centrifugal model experiment apparatus according to the second embodiment is provided with a video camera 81 and a measurement / recording unit 82. The measurement / recording unit 82 includes an image recording device (not shown). With such a configuration, it is possible to observe the damage situation of the simulated land area 66 when the simulated tsunami 111 hits, and it is possible to record as image information and perform analysis thereafter.

  In addition, various detectors such as strain gauges can be installed in the structure model of the simulated land area 66 shown in FIG. 10, and the impact force that the simulated tsunami 111 gives to the structure model. Etc. can be detected.

  The centrifugal model experiment apparatus according to the second embodiment described above has a configuration in which the model water channel portion 64 is continuous in an annular shape. Therefore, the generated simulated tsunami 111 is a wave that faithfully reproduces an actual tsunami. For this reason, the effect on the structure model is also closer to the actual situation, and the behavior of the ground and structure when an earthquake tsunami strikes can be clarified in more detail.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in said each embodiment. Various modifications or improvements can be added to the above embodiments.

  For example, in the centrifugal model experiment apparatus according to the second embodiment, the model water channel portion 64 can be tested only when the platform 65 is swung up in a substantially horizontal direction and the simulated land region portion 66 is set in the model water channel portion 64. However, the model water channel portion 64 and the platform 65 are surely connected in a state where they are subjected to centrifugal acceleration, and a configuration that reliably releases the connection after the end of the experiment is required.

  Therefore, as shown in FIG. 11A, for the purpose of reliably sealing water on the inclined surface, the tip of the platform 65 has an inclined surface that is angled to form a tapered wedge shape. The structure which installs the packing 121 is employ | adopted. On the other hand, the packing 122 is also installed on the surface on the rotary arm 63 side that faces the inclined surface when the entire platform 65 is in a substantially horizontal state. When the entire platform 65 is in a substantially horizontal state, the platform 65 is pushed out in the outer circumferential direction by using a pressing mechanism such as a hydraulic cylinder (not shown), and the packings 121 and 122 are firmly pressed together. With the wedge-shaped effect, a reliable seal of water is realized.

  The experiment is performed by injecting water when the above-described sealing state is achieved, and after the experiment is finished, the pressing mechanism used for pressing the packings 121 and 122 is operated in reverse to turn the packings 121 and 122 together. And the tilt angle of the platform 65 is lowered by lowering the rotational speed of the centrifugal model experimental device, and finally the centrifugal model experimental device is stopped.

  Moreover, in the centrifugal model experiment apparatus according to the second embodiment, various configuration examples applicable to the wave making apparatus have been described with reference to FIG. However, the scope of application of the present invention is not limited to that described above. For example, a wave making device as shown in FIG. 12 can be applied. That is, the wave making device 72C illustrated in FIG. 12 arranges the linear guide rail 127 and the rack 129 in parallel on the upper part of the water channel 130, while the wave making plate 126 installed in the water channel 130 has the linear guide rail 127. A guide block (not shown) that can freely reciprocate linearly and a gear 128 that meshes with the rack 129 are installed. The guide block (not shown) is attached to the wave making plate 126 by fastening means such as bolts, and the gear 128 is attached via an oil motor 125 installed on the wave making plate 126. Has been done.

  Accordingly, the wave making device 72C illustrated in FIG. 12 receives a moment reaction force during wave making by the linear guide device constituted by the linear guide rail 127 and the guide block (not shown), and meshes with the rack 129. A reliable driving force is transmitted by the gear 128. The wave making device 72C having such a configuration is suitable for a wave making device that needs to operate normally while receiving a large centrifugal acceleration, and the reaction force that is received from the weight of the wave making device 72C and water. Can be firmly received at the upper part of the water channel 130, and smooth operation can be realized.

  Note that it is also preferable to supply hydraulic oil using the above-described hydraulic pressure generating mechanism 51 with respect to the oil motor 125 serving as a drive source of the wave making device 72C illustrated in FIG. Can be supplied with sufficient hydraulic pressure to generate a wave.

  In the centrifugal model experimental apparatus according to the first and second embodiments described above, the case where the power generation means is configured as a hydraulic pressure generation mechanism 51 including an oil pump 52, a pinion gear 53, and a rack gear 54 is exemplified. Although described, the application range of the power generating means according to the present invention is not limited to the hydraulic pressure generating mechanism 51 described above.

  For example, by replacing the oil pump 52 with a generator, the rotational power obtained from the rotational motion of the rotary arms 21 and 63 can be converted into electric power using the generator and used by the rotary arms 21 and 63. it can. Further, by replacing the oil pump 52 with a compressed air generating pump, the rotational power obtained from the rotational motion of the rotating arms 21 and 63 is converted into compressed air using the compressed air generating pump, and the rotating arms 21 and 63 are converted. Can be used. The oil pump 52, the generator, and the compressed air generation pump can be used alone or in combination. Further, it is apparent from the description of the scope of claims that embodiments to which the above changes or improvements are added can also be included in the technical scope of the present invention.

It is a front view which illustrates schematic structure of the centrifuge model experimental apparatus which concerns on 1st Embodiment, and has shown the state which the rotation arm is not rotating especially. 1 is a front view illustrating a schematic configuration of a centrifuge model experimental apparatus according to a first embodiment, and particularly shows a state where a platform is swung up in a substantially horizontal direction by rotating a rotary arm at a high speed. It is a conceptual diagram for demonstrating the structural member and operating principle of the hydraulic pressure generation mechanism which concern on 1st Embodiment. It is a figure which illustrates the installation method of the hydraulic pressure generation mechanism with respect to the centrifuge model experimental apparatus which concerns on 1st Embodiment. It is a front view which shows the state before rotation of the centrifuge model experimental apparatus which concerns on 2nd Embodiment. It is a top view which shows the state before rotation of the centrifuge model experimental apparatus which concerns on 2nd Embodiment. It is a front view which shows the state in rotation of the centrifuge model experimental apparatus which concerns on 2nd Embodiment. It is a top view which shows the state in rotation of the centrifuge model experimental apparatus which concerns on 2nd Embodiment. It is a figure which shows the structural example of the wave making apparatus applicable to the centrifuge model experimental apparatus which concerns on 2nd Embodiment. It is a figure which shows the structural example of the simulation land area part applicable to the centrifuge model experimental apparatus which concerns on 2nd Embodiment, and is a figure for demonstrating the effect | action of the centrifuge model experimental apparatus which concerns on 2nd Embodiment. is there. It is a figure which shows another structural example of the platform applicable to this invention. It is a figure which shows another structural example of the wave making apparatus applicable to this invention. It is a figure which shows schematic structure of the conventional centrifuge model experimental apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Central axis, 12 Slip ring, 21 Rotating arm, 22 Fixing means, 31 Platform, 31a One platform, 31b The other platform, 32 Sample container, 33 Counterweight, 41 Motor, 42 Decelerator, 51 Oil pressure generating mechanism, 52 Oil pump, 53 pinion gear, 54 rack gear, 55 base portion, 61 motor, 61a motor shaft, 62 central shaft, 63 rotating arm, 63a central support, 63b1 to 63b8 radiating arm, 63c support ring, 64 model waterway 64a bottom plate part, 64b, 64c side plate part, 64d recess, 64e upper side plate part, 64f lower side plate part, 64g bottom plate part, 65 platform, 65a base plate part, 65b suspension member, 66 simulated land area part, 67 Rotating hinge, 67a circle Member 67b member 68 land area storage space 68a (land area housing space) one end, 68b other land area space 69, speed reducer 70 fixed bed 72A 72B, 72C Wave making device, 74 Water supply device, 75 Water supply pipe, 76 Water, 76A, 76B Simulated water area, 81 Video camera, 82 Measurement / recording unit, 85 Drive mechanism, 86 Moving plate, 91 Storage box, 92 Drive Mechanism, 93 moving plate, 100 breakwater model, 101 quay model, 104 house model, 105 building model, 106 simulated ground part, 106a (simulated ground part) one end, 106b (simulated ground part) the other end , 111 Simulated tsunami, 121, 122 Packing, 125 Oil motor, 126 Wave plate, 127 Linear guide rail, 128 gears, 129 Click, 130 waterways, 201 rotary arm, 202 sample vessels.

Claims (3)

A central shaft that is vertically installed and is rotatably driven around the axis as a rotation center;
A rotating arm that extends in a horizontal direction and linearly from the central axis and rotates in accordance with the rotational driving of the central axis;
A platform that is tiltably mounted on the rotary arm and configured to swing up in the direction of the combined acceleration of gravity acceleration and centrifugal acceleration when the rotary arm rotates.
A rotational drive source that exerts a rotational driving force on the central axis;
A centrifuge model experimental apparatus comprising:
An oil pump that generates hydraulic pressure;
A pinion gear installed in the oil pump;
An annular rack gear meshing with the pinion gear;
With
By configuring the ring gear so that the annular center of the rack gear and the center axis of the center shaft coincide with each other, the pinion gear rotates on the rack gear when the rotary arm rotates, and the oil pump Centrifugal model experiment device characterized by being driven. In the centrifugal model experimental apparatus according to claim 1 ,
The oil pump is installed on the rotating arm,
By installing the rack gear so as not to move,
A centrifugal model experiment apparatus, wherein the pinion gear revolves while rotating on the rack gear when the rotating arm rotates. In the centrifugal model experimental apparatus according to claim 1 or 2 ,
A fixing means for fixing and holding the platform with respect to the rotating arm when the platform is swung up by the combined acceleration acting in a substantially horizontal direction;
The centrifuge model experimental apparatus, wherein the fixing means is driven using hydraulic pressure generated by the oil pump.

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