JP3352864B2 - Analysis model generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to CAD or C
Design using so-called computers like AE system
The present invention relates to modeling of an analysis target in a production automation system, and more particularly to an analysis model generation device that ensures input of boundary conditions accompanying a change in a shape model.

[0002]

2. Description of the Related Art Conventionally, in an automatic design and production system using a computer such as a CAD or CAE system, shape operations such as cutting, assembling, and deleting a target shape, and analysis conditions used in the analysis are respectively described as follows. The input means are divided. For this reason, the user has separately input the analysis conditions used in the analysis to the model after performing the above-described shape operation.

As an example of such prior art, a method of cutting a shape model as one of the shape operations and generating a half model will be described. For example, SDRC's ID
In the EAS, when the user determines that the shape model is symmetric with respect to a certain plane, the user selects a cutting command and selects an appropriate cutting plane from among the cutting planes prepared for the coordinate axes. Generate a half model. And
In this conventional technique, a user selects and instructs the cut symmetry plane and inputs a constraint condition which is one of the analysis conditions. In addition, regarding the prior art of this cutting, “Exploring I
—DEAS Simulation MS1.2 (Japanese version) ”, pages 153 to 161 (Dentsu International Information Service Co., Ltd.).

According to Japanese Patent Application Laid-Open No. 3-148772, a load condition acting on each node of a target structure is automatically generated based on overall load data input by a user in order to reduce input work. What you do is already known.

[0005]

By the way, in the prior art described above, when an analysis model is created by performing a shape operation from a shape model to be analyzed by cutting, assembling, or deleting the shape, particularly, As a problem that occurs after performing such a shape operation, forgetting to create analysis conditions,
It was pointed out that it was time-consuming or required attention. For users who are unfamiliar with physical phenomena and simulation systems, requirements for analysis conditions (that is, creating and inputting analysis conditions)
Is a difficult task, and is usually performed by a skilled user. However, the task is still troublesome and time-consuming.

In the above-mentioned Japanese Patent Application Laid-Open No. 3-148772, the load conditions acting on each node of the target structure are automatically generated based on the input overall load data. Nothing is taught about automatic creation of analysis conditions when performing a shape operation involving cutting, assembling, or deleting a shape model.

Therefore, in the present invention, in view of the above-mentioned problems in the prior art, when creating an analysis model by performing a shape operation such as cutting, assembling, or deleting the shape of a shape model to be analyzed, analysis conditions are set. It is an object of the present invention to provide an analysis model generation device that can surely execute an analysis even for an unskilled and unskilled user without forgetting to create it. A disk device is disclosed.

According to the present invention, there is provided means for inputting a shape of an object to be analyzed and analysis conditions, processing means for automatically generating a finite element model based on the shape and the analysis conditions of the object to be analyzed input by the input means, A display unit that displays a shape model of the analysis target input by the means, wherein the processing unit includes a shape change unit that displays a changed portion associated with the shape operation on the display unit; An input requesting unit for automatically displaying an analysis condition input request screen for inputting an analysis condition in response to deletion of a part adjacent to the shape model to be analyzed in the shape changing unit. An analysis model generation device is disclosed.

Further, the present invention provides a means for inputting a shape and an analysis condition of an analysis object, a processing means for automatically generating a finite element model based on the shape and the analysis condition of the analysis object input by the input means, A display unit for displaying a shape model of the analysis target input by the input unit, wherein the processing unit is configured to execute analysis conditions in response to cutting of the shape model of the analysis target by the shape changing unit. And an input requesting unit for automatically displaying an analysis condition input request screen for inputting an analysis condition.

Further, the present invention provides means for inputting a shape of an object to be analyzed and analysis conditions, processing means for automatically generating a finite element model based on the shape and the analysis conditions of the object to be analyzed input by the input means, Display means for displaying a shape model of the analysis target input by the input means, wherein the processing means responds to the joining of the plurality of shapes of the analysis target shape model in the shape changing unit. An analysis model generation device, comprising: an input request unit for automatically displaying an analysis condition input request screen for inputting analysis conditions is disclosed.

According to the embodiment of the present invention, which will be described in detail below, when a user issues a command to change the shape, the shape is changed, the changed portion is highlighted, and the analysis condition is changed. Provide a screen that automatically displays the request screen. This prevents the analysis unit from forgetting to input the analysis conditions. Further, in order to interactively generate analysis conditions, analysis conditions that are more commonly used than before are prepared in advance as an analysis condition menu. The user selects analysis conditions from the menu. In addition, with respect to cutting, which is one of the shape operations, a function of calculating the vertical direction of the cut surface is provided, whereby a vertical constraint condition on the cut surface can be automatically generated.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. (1) Description of Overall Configuration Diagram: FIG. 1 shows an overall configuration diagram of an analysis model generation device for realizing the present invention. Reference numeral 1 in the figure denotes an analysis preprocessor which is a processing means for inputting a shape and analysis conditions and automatically generating a finite element model. The analysis preprocessor 1 includes a shape input unit 2 for inputting a shape, an analysis condition input unit 3, and a finite element model automatic generation unit 4 for automatically generating a finite element model. Further, reference numeral 5 in the figure denotes a database for storing each data of the shape, and reference numeral 6 denotes an input / output for the user to input the shape data or to display various models and display the analysis results. The device is shown.

Further, the analysis condition input unit 3 includes a shape display unit 7 for displaying the input shape on the screen, a shape changing unit 8 for changing the shape by a shape operation, and an analysis when the shape is changed. An input request unit 9 for prompting the user to input conditions is provided.

Next, the operation of the analytic model generating apparatus having the above-described configuration will be described. (2) Input request for analysis conditions for shape-changed part: FIG.
FIG. 5 shows an overall flow of shape change and analysis condition generation performed using the above-described analysis model generation device.

In step 11, a shape to be analyzed is input using the input / output device 6 of FIG. In step 12, it is determined whether or not to change the shape. As a result, when the user changes the shape (yes), the process proceeds to step 13, while when the user does not change the shape (no), the process proceeds to step 19.

Next, in step 13, a shape changing unit instructing process for instructing a part whose shape is to be changed is performed. Step 1
4 is a process for changing the shape of the part. Note that this processing is processing performed in the shape changing unit 8 in FIG. 1, and details thereof will be described later using the flow in FIG. 3. In step 15, after the shape is changed in step 14 described above, a process of highlighting the changed portion is performed so that the user can easily understand the changed portion. Then, in step 16, an analysis condition request screen for requesting input of analysis conditions in the portion highlighted in step 15 is displayed.

Thereafter, in step 17, the user refers to the screen in step 16 to select and set an analysis condition from the analysis conditions prepared in advance. Further, in step 18, the selection is made in step 17 described above,
Input the set analysis conditions to the changed part. Thereafter, the process returns to step 12 again, and is repeated until it is determined that the shape is not changed (no). If it is determined that the shape change is not performed (no), the process proceeds to step 19, and in this step 19, after performing the above process, a process of automatically generating a finite element model is performed.

Next, FIG. 3 shows step 1 of FIG.
4 shows a detailed flow of the shape change in FIG. That is, in step 21, the user gives an instruction for a shape change prepared in advance. Next, in step 22, in accordance with the input shape change command of the shape model, the shape of the designated portion is operated. Further, in step 23, a portion whose shape has been changed by the shape operation in step 22 is searched for and automatically highlighted.

Next, FIG. 4 shows an example of an analysis condition request screen displayed on the input / output device 6 in FIG. 1 in the generation of the analysis model. After the shape operation of FIG. 3 (step 22), the display screen highlights the portion changed by the shape operation (step 2).
3) This is a screen that is automatically output to prompt the user to input analysis conditions. Therefore, when inputting the analysis conditions on the screen, the user first selects “type of analysis conditions”.

FIG. 5 is a display example of a screen on which a more detailed analysis condition is output as a pop-up menu when the user selects “type of analysis condition” on the screen of FIG. In the figure, if you select "Type of analysis condition",
A pop-up menu of “load condition”, “contact condition”, “restriction condition”, “free”, and “user input” is displayed. As described above, frequently used analysis conditions such as “load condition”, “contact condition”, and “restriction condition” are prepared in advance. In these pop-up menus, “free” is a menu that is selected when canceling a condition that has been set, and “user input” is a condition other than the conditions prepared in advance. Used when inputting. In addition, the above “Type of analysis condition”
Clicking on the “CLOSE” button displayed on the right side of “” ends the analysis condition input work.

FIG. 6 shows a display example of a screen when "restriction condition" is selected from the pop-up menu shown in FIG. As is clear from the figure,
On the right side of “Analysis condition type”, “Constraint condition” is displayed, and below them, a menu button “x”,
“Y”, “z”, “rx”, “ry”, “rz” are displayed. That is, by clicking "x"
Conditions for restricting (fixing) in the x direction are set.
Each time the button is clicked, a toggle switch that reverses between the constraint and the unconstrained state is configured. The same applies to the other menu buttons “y” and “z”. The menu buttons “rx”, “ry”, and “rz” are toggle switches for restricting rotation about the x, y, and z axes.

FIG. 7 is a display example of a screen when "load condition" is selected from the pop-up menu of FIG. In this case as well, “load condition” is displayed on the right side of “analysis condition type”, and below them,
Menu buttons "x", "y", "z", "r"
x, “ry” and “rz” are displayed, and “pr”
An "essure" button is displayed. However, in the case of inputting the load condition, the menu buttons “x”, “y”,
“Z”, “rx”, “ry”, and “rz” do not constitute a toggle switch, and after clicking on each of these buttons, a numerical value indicating the load is input. In addition, each numerical value can be input below the “press” button.

FIG. 8 is a display example of a screen when "contact condition" is selected from the pop-up menu of FIG. In this case as well, “contact condition” is displayed on the right side of “type of analysis condition”, and a menu button “friction coefficient” is displayed below the “contact condition”, and the user clicks the “friction coefficient” button. Then, below that, a numerical value indicating the friction to be set is input.

Finally, FIG. 9 is a display example of a screen when "user input" is selected from the pop-up menu of FIG. 5, and in this case, the right side of "type of analysis condition" is displayed. , "User input", and below that,
A blank menu button is displayed, and the user inputs the setting condition to the blank menu button, and sequentially inputs the condition by the user while inputting a numerical value to be set below.

As described above, according to the analysis model creating apparatus of the present invention, when the shape of the analysis model to be analyzed is changed, an input request for automatically prompting the user to input the analysis conditions is provided. A section 9 is provided. Then, the user can efficiently create an analysis model from an analysis target by performing an input process of analysis conditions automatically prompted with the shape change.

Next, the case where deletion, cutting, joining, etc. are performed as a shape change will be described more specifically. (3) Input request for analysis conditions for adjacent deleted parts:
FIG. 10 shows an example in which the above-described analysis model generation device is used.
5 shows an overall flow of deleting a component adjacent to a component to be analyzed, and generating analysis conditions accordingly.

In FIG. 10, in step 101, in order to delete a component adjacent to a component to be analyzed, a process of designating the adjacent component is performed. In step 102, an instruction to delete an adjacent part is issued. Step 1
At 03, a shape operation of deletion is performed. In step 104, the joining face of the part to be analyzed changed by the shape operation in step 103 and the deleted part is highlighted. In step 105, an analysis condition request screen for requesting the input of the analysis condition is displayed on the joined surfaces. In step 106, the user selects and inputs the most appropriate analysis condition from among the analysis conditions prepared in advance from the pop-up menu of the screen displayed in step 105. In step 107,
The analysis conditions input in step 106 are generated on the joined surface.

Next, using the above-described analysis condition generation method in the analysis condition generation apparatus, one component is deleted from the shape composed of two components, and the analysis condition is applied to the surface to be joined with the deleted component. An example of generating pressure in accordance with the display of the request screen will be described with reference to FIGS.

FIG. 11 shows a shape composed of two parts. In this shape, an analysis target is set to 109, an adjacent part 108 is deleted, and a pressure is generated on a surface to which the hatched portion 110 is joined as an analysis condition equivalent to the deleted part 108 described above. . It should be noted that a hatched portion 110, which is a surface joining the portions 108 and 109, which is a portion changed by the deletion, is highlighted.

Next, in FIG. 12, the joined surface (the hatched portion 110) is highlighted, and a request analysis condition request screen for prompting the user to input analysis conditions is output corresponding to the highlighted portion. Therefore, the user sets the pop-up menu “type of analysis condition” or “CLOSE”
Click. Clicking on “CLOSE” ends the analysis condition input operation.

By selecting a part of "type of analysis condition" and clicking it, as shown in FIG.
A pop-up menu of analysis conditions is displayed to the user. In the displayed pop-up menu, “load condition”, “contact condition”,
A pop-up menu of "restriction condition", "free", and "user input" is displayed.

FIG. 14 shows a state where "load condition" is selected from these pop-up menus. In this state, similarly to the above, “load condition” is displayed on the right side of “type of analysis condition”, and below them, menu buttons “x” are displayed in two rows,
“Y”, “z”, “rx”, “ry”, “rz” are displayed, and further, a “pressure” button is displayed. Therefore, the user sets the direction of the load condition by selectively clicking these menu buttons,
Further, as shown in FIG.
Enter a number below the "e" button. In this example,
“1.0” is input as the pressure value.

FIG. 16 shows an example in which the pressure, which is the analysis condition input by the user, is displayed on the screen according to the guidance on the analysis condition request screen described above. As described above, according to the analysis model creation apparatus according to the present invention, the shape of the analysis model to be analyzed is changed, and in this case, in particular, in accordance with the deletion of the part adjacent to the part to be analyzed, In particular, by prompting the user to input analysis conditions for the deleted portion, it is possible to efficiently create an analysis model from an analysis target.

(4) Request for input of analysis conditions for cut plane: FIG. 17 shows cutting of a part adjacent to a part to be analyzed, which is performed using the analysis model generating apparatus of FIG.
An overall flow of the generation of the analysis conditions is shown. This figure 1
In step 111 of FIG. 7, a process of designating the shape is performed to change the shape of the component to be analyzed. Next, in step 112, a command to cut the shape is issued. Step 11
In 3, a shape operation called cutting is performed. Here, the shape operation of the part to be analyzed and the cut surface to be cut are performed. In step 114, the cut symmetry plane of the part to be analyzed changed by the shape operation in step 113 is highlighted. In step 115, an analysis condition request screen for requesting input of analysis conditions is displayed for the cut symmetry plane. Further, in step 116,
From the pop-up menu on the screen displayed in step 115, the user selects and inputs the most appropriate analysis condition from among the analysis conditions prepared in advance. Finally, in step 117, the above step 11
The analysis conditions input in step 6 are generated on the cut surface of the component to be analyzed.

Next, according to the method described above, a shape to be analyzed is cut to generate a half model, and a constraint condition is generated for the cut symmetry plane according to the display of the analysis condition request screen. An example will be described with reference to FIGS.

FIG. 18 shows a cylinder 200 having a shape symmetric with respect to the XY plane. In this cylindrical shape, a half model is created using the XY plane as a cutting plane. At this time, an example is shown in which a constraint condition is generated in the Z-axis direction as an analysis condition equivalent to the cut portion on the surface cut by the cut surface (XY surface). By the shape operation of cutting, the cut plane, which is the plane of symmetry, is highlighted.

FIG. 19 shows a cut plane (XY
(Surface) 201 is highlighted (hatched portion), and an analysis condition request screen is displayed on the right side thereof. Here, too, the user sets the pop-up menu “Type of analysis condition”
Alternatively, click “CLOSE”. Clicking on “CLOSE” terminates the analysis condition input operation.

Next, when the user selects and clicks on the "type of analysis condition" in FIG.
As shown in (1), a pop-up menu of analysis conditions is displayed to the user. In the displayed pop-up menu, "load condition",
"Contact conditions", "restrictions", "free", and
A pop-up menu of "user input" is displayed.

FIG. 21 shows a state in which a constraint condition is selected from the pop-up menu shown in FIG. 20. As is clear from the figure, "Type of analysis condition" is displayed on the right side of "Type of analysis condition". "Restriction condition" is displayed. At the bottom of these displays are the menu buttons "x", "y",
“Z”, “rx”, “ry”, and “rz” are displayed, and these buttons are screens for inputting the direction of the constraint. Here, the Z-axis direction constraint is input. And FIG.
2 shows an example of a screen displaying the Z-axis direction constraint, which is the analysis condition input according to the guidance on the above-described analysis condition request screen.

(5) Request for Input of Analysis Conditions for Joining Surface: FIG. 23 shows an overall flow for joining a plurality of components to be analyzed and generating analysis conditions for the joining surface associated therewith. First, in step 121 of FIG. 23, in order to perform joining such that a component is adjacent to a component to be analyzed, a process of designating the adjacent component is performed. In step 122, a command is issued to join the component to be analyzed. In step 123, a shape operation called joining is performed. In step 124, the above step 123
The joining surface that has been changed by the shape operation is highlighted. In step 125, an analysis condition request screen for requesting the input of analysis conditions is displayed for the joined surfaces. In step 126, the user selects and inputs the most appropriate analysis condition from the prepared analysis conditions from the pop-up menu of the screen displayed in step 125. Then, in step 127,
The analysis condition input in step 126 is generated for the joined surface.

Next, using the above-described analysis condition generation method,
An example in which another part is joined to the shape to be analyzed and a contact condition is generated on the joint surface in accordance with the display of the analysis condition request screen will be described with reference to FIGS.

First, in FIG. 24, the shape of the component 128 to be analyzed is shown on the screen. Then, in this part shape 128, the part 129 shown in FIG. 25 is joined. In this manner, an example is shown in which the component 129 is joined to the component 128 and a friction coefficient is generated as an analysis condition in a hatched portion 130 which is a joining surface of these components. At this time, the part 128 and the part 129 have different shapes.
Highlight 30.

In FIG. 26, the joining surface is highlighted, and then an analysis condition request screen is output to the right.
Here, too, the user clicks the pop-up menu “type of analysis condition” or “CLOSE”. Clicking on “CLOSE” terminates the analysis condition input operation.

Further, in FIG. 27, when the user selects and clicks on the "type of analysis condition" in FIG. 26, the "load condition", "contact condition",
A pop-up menu of "restriction condition", "free", and "user input" is displayed.

FIG. 28 shows a state in which “contact condition” is selected from the pop-up menu of the output analysis conditions. In this example, a pressure value of 1.23 is set as a numerical value of the friction coefficient. You are typing. Further, FIG.
Is an example in which a friction coefficient, which is an analysis condition input to the joined surface in accordance with the guidance of the analysis condition request screen described above, is displayed on the screen.

(6) Input request for analysis conditions for the joint surface of another part to be joined to the target part: FIG. 30 shows a shape composed of a plurality of parts displayed on a screen using the above-described analysis model generating apparatus. When a part to be analyzed is designated, a surface where the part and another part are joined is sequentially highlighted, and an entire flow of analysis condition generation for inputting analysis conditions related to the joined surface is shown.

In FIG. 30, in step 131, first, a shape composed of a plurality of parts is input using the preprocessor 1 of FIG. In step 132, a number is generated for each part having the shape input above. In general, each part has its structure and information so that it can be easily handled by CAD. One of the parts has a number for distinguishing it from other parts as described above. Step 133 is a part where the user determines whether to change the shape. If it is to be changed, the process proceeds to step 134, and if not, the process is terminated. In step 134, the user selects and designates an analysis target component for a shape composed of a plurality of components.

In step 135, a search is made as to whether the selected / instructed analysis target component has a component having a surface joined to another component. At this time, a search is performed for all parts, and the above-mentioned numbers are used in this search. Specifically, the parts are searched in order from the part having the lowest number.
The search for the joined surfaces is based on the boundary condition information and the phase element of each component described above. The boundary condition information and the phase element of this part are described, for example, in "Basics and Application of Three-Dimensional CAD", pages 19 to 36 (edited by Hiroshi Toritani and Hiroaki Chiyokura, Kyoritsu Shuppan Co., Ltd., 1991).

After searching for the joining surface, if there is an adjacent part (yes), the next step 136
Proceed to. On the other hand, as a result of the search, there is no adjacent part (n
o) If so, end.

In step 136, the searched joining surface is highlighted. In step 137, the shape is changed. In step 138, the changed part is highlighted after the shape is changed. In step 139, an analysis condition request screen is displayed for the highlighted portion. In step 140, analysis conditions are selected and input from the screen. In step 141, the analysis conditions selected and input in step 140 are generated in a shape.

Next, the flow of the above-described analysis condition generation will be described with reference to the model shown in FIG. The shape shown in FIG. 31 includes a plurality of parts, in this example, three parts 150, 1
51 and 152. Here, for example, the component 150 is selected and designated as the analysis target, and the joined surfaces are automatically highlighted for the components 151 and 152 having the joined surfaces, and the analysis condition request screen is displayed. To add analysis conditions. In the case of this model, a load condition is applied to the joint surface with the component 151 and the component 152
The constraint condition is input to the joint surface with.

Subsequently, referring to FIGS. 32 to 38 below,
In the model of FIG. 31 described above, a procedure for inputting a load condition on the joint surface with the component 151 and a constraint condition on the joint surface with the component 152 will be described. In addition, as a shape model, a part 1
50, 151, and 152 each have a number. In this model example, the component 151 has a lower number than the component 152.

First, in FIG. 32, the part 1 to be analyzed is
After indicating 50, a search for an adjacent part
51 is searched. This figure shows an example in which a joint surface with the component 151 is highlighted and an analysis condition request screen for adding an analysis condition is displayed. In this example, similarly to the above, the pop-up menus “type of analysis condition” and “CLOSE” are displayed, and the user clicks any one of them. Clicking on “CLOSE” terminates the analysis condition input operation.

FIG. 33 shows an example in which the above “type of analysis condition” is clicked to display a pop-up menu.
In this example as well, a pop-up menu of “load condition”, “contact condition”, “restriction condition”, “free”, and “user input” is displayed in the same manner as described above. Here, description will be made assuming that “load condition” is selected from these pop-up menus.

FIG. 34 shows an example of a load condition input screen which is output after "load condition" is selected from the menu of FIG. In this load condition input screen, menu buttons "x", "y", "z", "rx", "r" are displayed below "analysis condition type" and "restriction condition" in the same manner as described above.
y "and" rz "are displayed, and" pressur "
An "e" button is displayed. Then, the user sets the direction of the load condition by selectively clicking these menu buttons, and inputs a numerical value below the “pressure” button in the same manner as described above.

FIG. 35 shows an example in which load conditions are generated by the above-mentioned operation, and the generated load conditions are displayed on a screen.

FIG. 36 shows that, after the generation of the analysis condition for the joint surface with respect to the adjacent part 151, another adjacent part is searched. As a result, the part 152 is searched, and the part 150 to be analyzed and this part 150 are searched. Searched part 152
An analysis condition request screen for adding an analysis condition is displayed for the joint surface with.

FIG. 37 shows an example in which a menu of "analysis conditions" is displayed. Here, "restriction condition" is selected from the menu, and as a result, a screen for inputting the "restriction condition" is shown in FIG.

FIG. 39 shows an example in which a constraint condition is input to the joint surface between the component 150 to be analyzed and another component 152 by the above-described operation, and the generated load condition is displayed on a screen. I have.

(7) Request for input of analysis conditions for cut plane: Next, in FIG. 40, the shape displayed on the screen is cut, the cut plane is highlighted, and the cut plane is displayed in a direction perpendicular to the cut plane. 5 shows an overall flow of analysis condition generation for automatically generating constraint conditions. The generation of the analysis condition is an analysis condition creation support method that is considered based on the fact that, when the shape is symmetric, a constraint condition is often input as an analysis condition to a symmetry plane generated by the cut surface.

In the overall flow of FIG.
At 61, a process for supporting the shape to be cut by the user is performed. In step 162, the user issues a cutting command for the shape. In step 163, the above step 1
In response to the cutting instruction 62, a cutting surface is instructed, and processing for cutting the shape is performed. In step 164, the generated symmetry plane is highlighted. In step 165, a process of calculating the vertical direction is performed on the generated symmetry plane.
The calculation in the vertical direction is performed by calculating the inclination of the symmetry plane by determining the points constituting the symmetry plane having coordinate values, and obtaining the vertical direction with respect to the inclination. In step 166, constraint conditions are automatically generated as analysis conditions in the vertical direction with respect to the generated symmetry plane.

An example in which a cylinder is cut using this apparatus in accordance with the above processing flow and constraint conditions are generated will be described with reference to FIGS. 41 and 42. First, FIG.
3 shows the shape of a cylinder that is symmetric with respect to a plane. The coordinate axes are the x-axis and the y-axis as shown, and the z-axis is a direction perpendicular to the plane of the drawing.

In this columnar shape, a half model is created using the xy plane as a cutting plane. At this time, a constraint condition is generated in the z-axis direction as an analysis condition equivalent to the cut portion of the surface cut by the cut surface. The constraint condition is calculated from the coordinate values of the cut surface in the process of step 165 in FIG.

As a result, as shown in FIG. 42, the cut surface is highlighted (hatched portion), and a constraint condition is automatically generated in the z-axis direction. In this example, this part is set as being completely restrained and not moving.

[0065]

As is apparent from the above detailed description, according to the analysis model generating method and apparatus according to the present invention, when creating an analysis shape model from an actual shape model, a user can perform a shape operation. Simultaneously with the instruction, an analysis condition request screen having a guidance function is output, and the user selects an analysis condition from the screen and generates an analysis condition, thereby enabling an analysis model to be created more efficiently. .

By providing a function of automatically outputting the above-mentioned analysis condition request screen, it is possible to reliably add analysis conditions without forgetting to input the analysis conditions of the analysis model.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an analysis model generation device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the analysis model generation device.

FIG. 3 is a flowchart illustrating details of the shape change in FIG. 2;

FIG. 4 is a view showing an example of an analysis condition request screen in the operation of the analysis model generation device.

FIG. 5 is a view showing an example of a pop-up menu on the analysis condition request screen of FIG. 4;

FIG. 6 is a view for explaining input of a constraint condition in a pop-up menu of the analysis condition request screen of FIG. 5;

FIG. 7 is a view for explaining input of load conditions in a pop-up menu of the analysis condition request screen of FIG. 5;

FIG. 8 is a view for explaining input of contact conditions in a pop-up menu of the analysis condition request screen of FIG. 5;

FIG. 9 is a view for explaining user input in a pop-up menu of the analysis condition request screen of FIG. 5;

FIG. 10 is a flowchart illustrating an operation of the analysis model generation device according to another embodiment of the present invention.

FIG. 11 is an explanatory diagram illustrating a highlighting operation on a deleted surface of the analysis model generation device according to another embodiment.

FIG. 12 is a view showing an example of an analysis condition request screen for a deleted surface in FIG. 11;

FIG. 13 is a view showing an example of a pop-up menu of types of analysis conditions for a deleted surface shown in FIG. 11;

FIG. 14 is a diagram showing an example of input of a load condition of the analysis condition of the deleted surface shown in FIG. 11;

FIG. 15 is a diagram showing an example of a pressure input of a load condition of the analysis condition of the deleted surface shown in FIG. 11 as described above.

FIG. 16 is a diagram showing an example of a screen display for generating a load condition of the analysis condition of the deleted surface shown in FIG. 11;

FIG. 17 is a flowchart illustrating an operation of the analysis model generation device according to still another embodiment of the present invention.

FIG. 18 is a diagram showing an example of a cut cylinder model in the analysis model generation device of FIG. 17;

FIG. 19 is a view showing an example of an analysis condition request screen for a cut surface of the cylindrical model in FIG. 18;

FIG. 20 is a diagram showing an example of a pop-up menu of types of analysis conditions of the cut surface shown in FIG. 18;

FIG. 21 is a diagram showing an example of input of a constraint condition of the cut surface analysis condition shown in FIG. 18;

FIG. 22 is a view showing an example of a screen display for generating a constraint condition of the analysis condition of the cut surface shown in FIG. 18;

FIG. 23 is a flowchart illustrating an operation of the analysis model generation device according to still another embodiment of the present invention.

FIG. 24 is a diagram showing an example of a joint model in the analysis model generation device of FIG. 23;

FIG. 25 is a diagram showing an example of a joint surface where the model of FIG. 24 and other components are joined.

FIG. 26 is a view showing an example of a screen for requesting analysis conditions of a joint surface of the model shown in FIG. 24;

FIG. 27 is a view showing an example of a pop-up menu of types of analysis conditions of the bonding surface shown in FIG. 24;

FIG. 28 is a diagram showing an example of input of contact conditions of the bonding surface analysis conditions shown in FIG. 24;

FIG. 29 is a view showing an example of a screen display of contact condition generation of the joint surface analysis conditions shown in FIG. 24;

FIG. 30 is a flowchart illustrating an operation of the analysis model generation device according to still another embodiment of the present invention.

FIG. 31 is a diagram showing an example of a joint model with an adjacent part in the analysis model generation device of FIG. 30;

FIG. 32 is a view showing an example of an analysis condition request screen of a joint model with an adjacent part in the analysis model of FIG. 31;

FIG. 33 is a view showing an example of a pop-up menu of the types of analysis conditions of the bonding surface shown in FIG. 32;

FIG. 34 is a view showing an example of input of load conditions of the analysis conditions shown in FIG. 33;

FIG. 35 is a view showing an example of a screen display for generating a load condition on the joint surface shown in FIG. 34;

FIG. 36 is a view showing an example of an analysis condition request screen of a joint model with another adjacent part in the analysis model of FIG. 31;

FIG. 37 is a view showing an example of a pop-up menu of types of analysis conditions of the bonding surface shown in FIG. 36;

FIG. 38 is a diagram showing an example of input of a constraint condition of the analysis conditions shown in FIG. 37;

FIG. 39 is a diagram showing an example of a screen display by generating a load condition on the joint surface shown in FIG. 34 and generating a constraint condition shown in FIG. 38;

FIG. 40 is a flowchart illustrating an operation of the analysis model generation device according to still another embodiment of the present invention.

FIG. 41 is a diagram showing an example of a cut cylinder model in the analysis model generation device of FIG. 40;

FIG. 42 is a diagram showing an example of constraint condition generation of a cut cylinder model in the analysis model generation device of FIG. 40;

[Explanation of symbols]

 Reference Signs List 1 analysis preprocessor 2 shape input unit 3 analysis condition input unit 4 finite element model automatic generation unit 5 database 6 display unit 7 shape display unit 8 shape change unit 9 input request unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Tsurugi 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. In the laboratory (72) Inventor Noriaki Okamoto 502 Kandachi-cho, Tsuchiura-city, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (56) References JP-A-5-266150 (JP, A) JP-A-6-4630 (JP, A JP-A-6-119418 (JP, A) JP-A-6-236424 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 17/50 JICST file (JOIS)

Claims (3)

(57) [Claims] A means for inputting a shape and an analysis condition of an analysis object; a processing means for automatically generating a finite element model based on the shape and the analysis condition of the analysis object input by the input means; An analysis model generating apparatus comprising: a display unit configured to display an input shape model of an analysis target; wherein the processing unit includes a shape changing unit configured to display a changed portion associated with the shape operation on the display unit; An input requesting unit for automatically displaying an analysis condition input request screen for inputting an analysis condition in response to a deletion of a part adjacent to the shape model to be analyzed in the changing unit. Generator. 2. A means for inputting a shape and an analysis condition of an analysis object, a processing means for automatically generating a finite element model based on the shape and the analysis condition of the analysis object inputted by said input means, A display unit for displaying the input shape model of the analysis target, wherein the processing unit inputs analysis conditions in response to cutting of the shape model of the analysis target by the shape changing unit. An analysis model generation device, comprising: an input request unit for automatically displaying an analysis condition input request screen. 3. A means for inputting a shape and an analysis condition of an analysis object, a processing means for automatically generating a finite element model based on the shape and an analysis condition of the analysis object inputted by said input means, A display unit for displaying the input shape model of the analysis target, wherein the processing unit changes an analysis condition in response to joining of the plurality of shapes of the analysis target shape model in the shape changing unit. An analysis model generation device, comprising: an input request unit for automatically displaying an analysis condition input request screen to be input.