JP2001306634A - Device and method for generating contact analytic model, and recording medium with recorded contact analytic model generating program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact analytic model generating device which can generate a simple analytic model composed of only components requiring numerical analysis with ease. SOLUTION: The contact analytic model generating device includes an evaluation model generation part 1 which generates an evaluation model for evaluation an actual object model by extracting some components relative in a depression direction from an actual model to be analytic object, an influence degree evaluation part 2 which evaluates the evaluation model generated by the evaluation model generation part 1, and a simple analytic model generation part 3 which generates a contact analytic model according to the evaluation result of the influence degree evaluation part 2. The simple analytic model generation part 3 generates the contact analytic model according to the evaluation result of the evaluation model, so the contact analytic model composed of only the components requiring numeric analysis can be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for obtaining mechanical properties of a product required in a product design and a development process of a manufacturing apparatus by a numerical analysis, and in particular, creates a contact analysis model used in the numerical analysis. The present invention relates to a contact analysis model creation device, a contact analysis model creation method, and a recording medium storing a contact analysis model creation program.

[0002]

2. Description of the Related Art In recent years, PDAs (Personal Digital Assis
Small portable information terminals and pen computers typified by tant) are widely used. Usually, in these information terminals, a user uses a handwriting pen to input characters and give instructions such as various editing functions. In general, a user's instruction is performed by moving a handwriting pen on a liquid crystal screen. For details of these operation methods, refer to, for example, an instruction manual of a small portable information terminal “Zaurus” PI-7000 manufactured by Sharp Corporation.

[0003] An apparatus having such a handwriting pen input device to be moved on a liquid crystal display screen generally has a hierarchical structure in which a tablet and a plurality of other parts are stacked. When the user inputs data with the pen, the input is performed by pressing the tablet on the upper surface with the pen. However, because the tablet and components such as liquid crystal arranged below it are close to each other, and each component such as the light guide plate, film, and substrate are close to each other, contact between the components occurs due to pressing, Due to the influence, a compression phenomenon is applied to the components arranged under the tablet, and a contact phenomenon occurs. As a result, strains and stresses are generated in the components arranged under the tablet. Tablets and liquid crystals generally use easily breakable materials such as glass, and it is necessary to grasp the mechanical characteristics of each part when designing products.

On the other hand, a numerical analysis simulation using a computer, for example, FEM (Finite Element Metho)
d) and BEM (Boundary Element Method)
Various physical phenomena such as stress analysis and heat conduction analysis of structures can be analyzed. When designing a product of an information terminal such as a PDA as described above, numerical analysis simulations are performed on many design proposals, for example, at the product design stage, and the superiority of the design proposals is examined with reference to the simulation results. Is being done.

[0005] Even if it is desired to examine the mechanical characteristics relating to the entire design plan, it is practically impossible to simulate the entire design plan of the product as it is with the current computer performance because the shape is too complicated. It is. Therefore, it is necessary to replace the entire design plan with a calculation model for performing a simulation, and it is necessary to reduce the amount of calculation so as not to deviate from the essence to be studied while performing some kind of simplification.

As an example of a conventional calculation model simplification method, there is an invention disclosed in Japanese Patent Application Laid-Open No. 6-4629. FIG. 18 is a diagram for explaining the numerical analysis method disclosed in Japanese Patent Laid-Open No. 6-4629. First, regions that do not require analysis are omitted from the prototype model to be analyzed, and an abbreviated model consisting only of the regions that require analysis is created (P1).

[0007] Then, the degree of influence of the omitted part on the omitted model is quantitatively evaluated (P2), and one or more parameters defining the omitted model are corrected based on the evaluation result, whereby the equivalent of the prototype model is obtained. A modified omission model is created (P3).

[0008]

However, in the above-described numerical analysis method disclosed in Japanese Patent Application Laid-Open No. 6-4629, parts that do not require analysis are omitted from the calculation model. It cannot be applied to problems that require correlation between parts. Therefore, in order to apply the method to the contact problem, it is necessary to create a calculation model for all the parts, and there is a problem that an enormous effort is required to create the calculation model. There is also a problem that a great deal of calculation time is required to create the calculation model.

[0009] Further, there is a problem that it is difficult to guarantee the calculation accuracy because the criteria for determining which parts are omitted from the calculation model are not specified.

The present invention has been made to solve the above problems, and a first object of the present invention is to make it possible to create a simple analysis model composed of only parts that need numerical analysis with little effort. It is an object of the present invention to provide a contact analysis model creation device, a contact analysis model creation method, and a recording medium storing a contact analysis model creation program.

A second object is to provide a contact analysis model creation device, a contact analysis model creation method and a contact analysis model creation method capable of creating a contact analysis model capable of reducing the calculation time required for numerical analysis while preventing a decrease in calculation accuracy. An object of the present invention is to provide a recording medium recording a contact analysis model creation program.

[0012]

According to one aspect of the present invention, a contact analysis model creating apparatus extracts a part of a part related to a pressing direction from an actual model to be analyzed and evaluates the extracted part. An evaluation model creating means for creating an evaluation model of the evaluation model, an evaluation means for evaluating the evaluation model created by the evaluation model creating means, and a contact analysis model for creating a contact analysis model based on an evaluation result by the evaluation means. Contact analysis model creation means.

[0013] Since the contact analysis model creating means creates the contact analysis model based on the evaluation result of the evaluation model, it is possible to create a contact analysis model composed of only parts requiring numerical analysis. Becomes Further, since parts that do not require numerical analysis are deleted, it is possible to create a contact analysis model that can reduce the calculation time required for numerical analysis while preventing a decrease in calculation accuracy.

[0014] Preferably, the evaluation model creating means includes a dividing means for dividing the part into partial parts, and a first calculating means for applying a load to the partial parts divided by the dividing means to calculate a deformation amount. Means for determining whether to add a partial part to the evaluation model based on the amount of deformation calculated by the first calculating means; and
Creating means for creating an evaluation model based on the determination result by the determining means.

The first determining means determines whether or not to add a partial part to the evaluation model based on the deformation amount calculated by the first calculating means. Therefore, the first determining means has a large influence on the entire actual model. Only in the evaluation model.

[0016] More preferably, the first judging means compares the input deformation amount threshold with the input deformation amount threshold and the deformation amount calculated by the first calculating means. Means for determining whether to add a partial part to the evaluation model.

The threshold value of the deformation amount is compared with the calculated deformation amount to determine whether or not to add the partial component to the evaluation model. Can be appropriately changed.

More preferably, the evaluation means includes a second calculation means for calculating a deformation amount by applying a load to the evaluation model; and an evaluation model based on the deformation amount calculated by the second calculation means. Second determination means for determining whether or not to include in the contact analysis model.

The second determining means determines whether or not to include the evaluation model in the contact analysis model based on the amount of deformation calculated by the second calculating means, so that the influence of deformation of other parts is large. Only parts can be included in the contact analysis model.

More preferably, the second judging means compares the tolerance for calculating the contact determination tolerance in the evaluation model with the deformation calculated by the second calculating means. For determining whether or not to include in the contact analysis model.

Since it is determined whether the evaluation model is included in the contact analysis model by comparing the tolerance with the calculated deformation amount, the parts included in the contact analysis model are changed by appropriately changing the tolerance. It becomes possible.

[0022] More preferably, the contact analysis model creating means models a part which is less affected by the deformation of the evaluation model as a rigid body.

[0023] The contact analysis model creation means models a part that is less affected by the deformation of the evaluation model as a rigid body, so that it is possible to further reduce the calculation amount when performing a numerical analysis using the created contact analysis model. Becomes

According to another aspect of the present invention, a contact analysis model creating method creates an evaluation model for extracting and evaluating a part of a part related to a pressing direction from an actual model to be analyzed. Performing, a step of evaluating the created evaluation model, and a step of creating a contact analysis model based on the evaluation result.

Since the contact analysis model is created based on the evaluation result of the evaluation model, it is possible to create a contact analysis model composed of only the parts that require numerical analysis. Further, since parts that do not require numerical analysis are deleted, it is possible to create a contact analysis model that can reduce the calculation time required for numerical analysis while preventing a decrease in calculation accuracy.

According to still another aspect of the present invention, there is provided a computer-readable recording medium storing a program for causing a computer to execute a contact analysis model creation method, wherein the contact analysis model creation method includes Creating an evaluation model for extracting and evaluating a part of the part related to the pressing direction from the actual model,
The method includes a step of evaluating the created evaluation model and a step of creating a contact analysis model based on the evaluation result.

Since the contact analysis model is created based on the evaluation result of the evaluation model, it is possible to create a contact analysis model composed only of the parts that require numerical analysis. Further, since parts that do not require numerical analysis are deleted, it is possible to create a contact analysis model that can reduce the calculation time required for numerical analysis while preventing a decrease in calculation accuracy.

[0028]

First, a contact analysis method using a contact analysis model created by a contact analysis model creation device according to an embodiment of the present invention will be described. FIG. 1 is a flowchart for explaining the processing procedure of this contact analysis method. First, a contact analysis model is generated from a shape to be analyzed (S1). Then, a structural analysis is performed on the generated analysis model to calculate stress, displacement, and the like (S2). Finally, the result of the structural analysis is evaluated based on the calculation result by the structural analysis (S3).

The contact analysis model creation device according to the present embodiment realizes the contact analysis model generation step shown in step S1, and the details thereof will be described below. Since the structural analysis step shown in step S2 and the evaluation step shown in step S3 can be realized by using a commercially available finite element method system or the like,
A detailed description will not be given here.

FIG. 2 shows an example of an actual model (hereinafter referred to as an actual model) created based on a design plan.
Components 31, 32, 33, and 34 are included. When a load of a load P is applied to the actual model, a bending deformation occurs in the component 31 as shown in FIG.
, And the component 32 also undergoes bending deformation. When the load P is further increased, the center of the part 32
Touch 3. Hereinafter, the deformation that occurs when the load P is increased to the maximum load Pmax and the contact state thereof will be examined. Although FIGS. 2 and 3 illustrate a two-dimensional model for simplicity, the present invention can be easily extended to a three-dimensional model.

FIG. 4 is a block diagram showing a schematic configuration of the contact analysis model creating apparatus according to the embodiment of the present invention. This contact analysis model creation device divides an actual model to be analyzed into basic shapes such as a simple rectangular parallelepiped, and creates an evaluation model for evaluating the extent to which deformation due to load affects the portion. 1, an impact evaluation unit 2 that simulates a displacement of the evaluation model created by the evaluation model creation unit 1 and evaluates the influence of the displacement on other parts, and an evaluation result by the impact evaluation unit 2. And a simplified analysis model creation unit 3 for creating a simplified analysis model.

FIG. 5 is a flowchart for explaining the processing procedure of the contact analysis model creation device in the present embodiment. First, the evaluation model creation unit 1 divides a real model to be analyzed into a basic shape such as a simple rectangular parallelepiped using a real model to be analyzed. Note that the divided basic shapes are referred to as partial components. Then, the evaluation model creating unit 1 extracts a part which is a main factor of the deformation from the parts related to the pressing direction by applying a load by combining the partial parts, and determines how far the deformation due to the load affects. An evaluation model for evaluation is created (S11).

FIG. 6 is a flowchart for explaining the processing in step S11 in FIG. 5 in more detail. First, the user inputs parameters used when examining a model to be analyzed (S111). For example, when a load is applied to the real model, it is determined whether or not the deformation of the partial part is important for the deformation of the entire real model, and a reference value for extracting an important partial part is input. As the determination reference value, a displacement amount of a partial component when a constant load is applied is used. By appropriately changing the criterion value, it is possible to change a partial component added to the evaluation model.

Next, the evaluation model creating unit 1 converts each part of the real model to be analyzed into a basic shape (partial part) such as a cube.
(S112). This division is made into a rectangular parallelepiped having a wide plane so that the bending deformation of the partial component becomes larger in the compression direction. FIG. 7 shows a state where the real model shown in FIG. 2 is divided into partial parts. The part 33 is divided into partial parts 65 to 67, and the part 34 is divided into partial parts 63, 64 and 68. In addition,
Part parts 61 and 62 correspond to parts 31 and 3 respectively.
2 is supported.

Next, the evaluation model creation section 1 executes step S
A partial part extraction model based on the load condition, the constraint condition and the contact condition is created for the partial part divided in 112 (S113). In other words, not only the boundary condition part of the partial part but also the contact part is supported,
A boundary part condition is set for the location to create a partial part extraction model.

FIG. 8 shows a partial part extraction model created from the partial parts shown in FIG. FIG. 8 (a)
The partial part extracting model created from the partial part 61 is shown. The model is supported at both ends of the partial part 61, and the load P is pressed at the center. FIG.
(B) shows a partial component extraction model created from the partial component 63, which is supported at both ends of the partial component 63, and the load P is pressed at the center thereof. FIG. 8C shows a partial component extraction model created from the partial component 62. The model is supported at both ends of the partial component 62, and the load P is pressed at the center thereof.

Next, the evaluation model creating section 1 applies a load to the created partial part extracting model to simulate the deformation of the partial part (S114). The deformation amount of this part can be obtained not only by numerical analysis simulation but also by using a theoretical solution. The theoretical solution of the deformation due to the bending of the plate can be obtained by a calculation formula described in a well-known document (Mechanical Engineering Handbook A4 Basic Material Mechanics A4-52, flat plate bending, etc.). For details, refer to these known documents.

Next, the evaluation model creation section 1 executes step S
The amount of deformation calculated in 114 and step S111
Then, it is determined whether or not the deformation of the partial part is important for the deformation of the entire real model (S115). When the amount of deformation of the partial part is equal to or greater than the determination reference value (Yes in S115), it is determined that the deformation of the partial part is large and the effect on the entire actual model is large. The part is extracted and stored (S116). Hereinafter, the extracted partial part is referred to as an extracted partial part.

If the deformation of the partial part is smaller than the determination reference value (S115, No), it is determined that the deformation of the partial part is small and the influence on the entire model is small.
The evaluation model creating unit 1 proceeds to the next process without saving the partial part. Note that the processes of steps S113 to S116 are performed on all partial components.

FIG. 9 is a diagram showing an extracted partial part extracted from the partial part shown in FIG. Extraction part parts 81-8
4 respectively correspond to the partial parts 61, 62, 67 and 68. The distance between the extracted partial parts 81 and 82 is r1, and the distance between the extracted partial parts 82 and 83 is r2.

When the process of storing the extracted partial components is completed, the evaluation model creating unit 1 creates an evaluation model by combining the stored extracted partial components in order from the compression location in the compression direction (S117).

FIG. 10 is a diagram for explaining a procedure for creating an evaluation model. First, the evaluation model creating unit 1 extracts an extracted partial part 81 to which the load P is applied as shown in FIG. 10A from among the stored extracted partial parts. Next, as shown in FIG. 10B, the evaluation model creating unit 1 adds an extracted partial component 82 close to the extracted partial component 81. In this way, by adding the extracted partial parts that are close in order from the extracted partial part 81 to which the load P is applied, the evaluation model shown in FIG. 10C is created, and finally the evaluation model shown in FIG. An evaluation model is created. When there is an extracted partial part having the same distance, those extracted partial parts are combined and used as one extracted partial part. Therefore, the number of evaluation models is a number obtained by subtracting the number of combinations of extracted partial components located at substantially the same distance from the number of extracted partial components. Note that the process of step S117 is performed on all the extracted partial components, and an evaluation model is created.

Returning to the description of the flowchart shown in FIG. Next, using the evaluation model created by the evaluation model creation unit 1, the impact evaluation unit 2 performs an evaluation for creating a simple analysis model (S12). The influence evaluation unit 2 simulates a displacement when a load P is applied to the created evaluation model, and performs an evaluation based on a distance from a nearby component or the like as an evaluation criterion. That is, it is determined whether or not there is a contact with an adjacent component due to the displacement of the component to which the load P is applied, and if the contact makes contact, the displacement of that portion is small and has no effect. In the case where the actual model is the model shown in FIG. 2, the displacement due to the load P monotonically increases, so it is sufficient to evaluate the displacement when the load is changed to the maximum load.

FIG. 11 is a flowchart for explaining the processing of step S12 in FIG. 5 in more detail. First, the user inputs the maximum load amount Fmax (the maximum load guaranteed in design) (S121). Then, in order to determine a contact determination tolerance that is a determination criterion for performing the evaluation, the user makes contact by displacing the target partial part from the evaluation model created in step S11. A distance from another partial part, a thickness of the partial part, a weight coefficient, a safety factor, and the like are input (S122).

Next, the impact evaluation section 2 executes step S12.
The contact determination tolerance ti is determined using the various parameters input in Step 2 (S123). The contact determination tolerance value ti is a value for determining whether or not contact occurs due to displacement of the evaluation model. The displacement of the evaluation model is the tolerance value ti for contact determination.
If it is larger, it is determined that the partial part is in contact. As the contact determination tolerance, there is a distance between a partial component and another partial component that comes into contact when the partial component is displaced. The safety coefficient may be multiplied by the contact determination tolerance value in consideration of the manufacturing error and the assembly error of the component. In order to change the weighting of some parameters, a weighting factor may be considered. It is also possible to consider the thickness of the partial part. By appropriately changing the tolerance, the components included in the simplified analysis model can be changed.

Next, the influence evaluation section 2 calculates the displacement by adding the load P to the evaluation model (S124). The calculation of the displacement is performed while sequentially increasing the number of partial components in the compression direction from the partial components to which the load P is applied. Since the simple analysis model is easier to calculate when the number of parts is small, it is efficient to perform processing while sequentially increasing the number of parts in the compression direction. Then, the degree-of-impact evaluator 2 obtains the displacement ui (P) of the evaluation model (S125). Note that the displacement ui (P) is calculated by simulation or theoretical solution as in step S114, and is performed up to the maximum load Fmax.

Next, the influence evaluation section 2 calculates a load-displacement function in the evaluation model currently evaluated, a load-displacement function in the evaluation model evaluated in the past,
The contact judgment tolerance of the evaluation model currently being evaluated,
Using the contact determination tolerance of the evaluation model evaluated in the past, it is determined how much the simplified analysis model should be considered (S126). Steps S122 to S12 are performed until the extent to which the simplified analysis model is considered is determined.
Step 6 is repeated.

FIGS. 12 to 14 are diagrams for explaining how much to consider the simplified analysis model shown in step S126. FIG. 12 shows a load-displacement function when a load is applied to the component 31 shown in FIG. Partial parts 81
, A load-displacement function when a load P is applied is represented by a straight line 111, and a contact determination tolerance t1 is represented by a straight line 112. Although the load-displacement function is represented by using the small deformation theory, the following processing can be similarly performed using the large deformation theory.

When the load-displacement function 111 and the contact determination tolerance 112 intersect, it is considered that the part 31 and the part 32 are in contact with each other, so that it is determined that the part 32 needs to be added to the simplified analysis model. When the load-displacement function is represented by a straight line 113, the maximum load Fm
Even if ax is added, the load-displacement function 113 does not intersect with the contact determination tolerance 112, so it is considered that the part 31 and the part 32 do not contact each other, and it is determined that the part 32 does not need to be added to the simplified analysis model.

Consider a case where this evaluation method is applied to the evaluation model shown in FIG. First, the evaluation model shown in FIG. 10A is used as an initial model, and the distance r1 between the extracted partial parts 81 and 82 is used as the contact determination tolerance t1. When the load P is gradually applied to the evaluation model shown in FIG. 10A, the extracted partial part 81 is deformed, and a displacement function u1 is obtained as shown in FIG. Here, for the sake of simplicity, u1 is a displacement at the center uppermost portion of the extracted part 81. In addition to the above, the extracted partial component may be changed to a neutral surface or a lower portion as needed.

Using this displacement function u1, it is determined how much the simplified analysis model needs to be considered. FIG.
In the graph shown in FIG. 7, if the displacement function u1 is given by a straight line 121, the displacement function 121 and the contact determination tolerance 123 (= r1) intersect, so that it is determined that the component 31 and the component 32 are in contact under the load F1. The evaluation is performed using the following evaluation model.

Next, using the evaluation model shown in FIG. 10B, the extracted partial component 82 is determined as the contact determination tolerance t2.
And the distance r2 between 83 and 83 is used. When the load P is gradually applied to the evaluation model shown in FIG. 10B, the extracted partial parts 81 and 82 are deformed together, and a displacement function u2 as shown in FIG. 13 is obtained. In FIG. 13, since the displacement function u2 does not intersect with the contact determination tolerance 125 even when the maximum load Fmax is applied, it is considered that the component 32 does not contact the component 33, and the component 33 does not need to be added to the simple analysis model. Is determined. When the displacement function u2 intersects with the contact determination tolerance 125, evaluation using the evaluation model shown in FIG. 10C is subsequently performed.

As described above, the displacement u (P) is expressed by the following equation. u (P) = u1 (P) | P <F1 (1) u1 (F1) + u2 (P) | P> F1, where u1 is a displacement function of the evaluation model shown in FIG. 10A, and u2 is FIG. Displacement function of the evaluation model shown in (b),
P is the load, F1 is the displacement function u1 is the contact determination tolerance t
It shows the load when it becomes 1.

When changing from the evaluation model shown in FIG. 10A to the evaluation model shown in FIG.
The following equation can also be used.

U (P) = u1 (P) | P <F1 (2) u1 (F1) + u2 (P-F1) | P> F1 When P> F1, the equation (1) is initialized. Since the increment from the load is added, and the increment from the load F1 is added in the equation (2), the safer evaluation is to use the equation (1) in the large deformation theory.

As shown in FIG. 14, depending on the displacement of the component 32, the component 32 and the component 33 are in contact with each other, but it may be determined that the displacement of the component 32 is extremely small. In step S122, a certain range q2 is input from the contact determination tolerance t1. If the displacement function 131 is included in this range q2, contact has occurred, but the influence on the lower part is considered to be small. Alternatively, the component 33 may be handled as a rigid body.

Returning to the description of the flowchart shown in FIG. Next, the simple analysis model creation unit 3 performs step S1
A simplified calculation model (simple analysis model) is created from the real model shown in FIG. 2 based on the evaluation contents in (2) (S13). FIG. 15 shows a simplified analysis model created from the real model shown in FIG. This simple analysis model includes a component 141 corresponding to the component 31 and a component 142 corresponding to the component 32 shown in FIG. Note that the components 33 and 34 shown in FIG. 2 are modeled as rigid bodies because they are less affected by the deformation of the component 31. By making the component less affected by deformation a rigid body, it is possible to further reduce the amount of calculation when performing a numerical analysis using the created contact analysis model.

As a simulation used in each evaluation, a simple logical expression can be used. In this case, the time required for modeling can be further reduced.

The contact analysis model creating apparatus described above
It can be realized using a general computer shown in FIG. The computer 130 includes a computer main body 131, a mouse 134, a keyboard 136, and a monitor 148. Also, the computer body 131
Is an FD drive 142 on which an FD (Floppy Disk) 150 is mounted and a CD-ROM (Compact Disc-Read On).
ly Memory) 152 is included.

The above-described contact analysis model creation device (contact analysis model creation method) is realized by the computer 130 executing a program. This contact analysis model creation program is FD150 or CD-ROM
152 and the like. The contact analysis model creation program is executed by the computer main body 131 to create a contact analysis model. Further, the contact analysis model creation program may be supplied to the computer main body 131 from another computer via a communication line.

FIG. 17 is a block diagram showing a configuration example of the computer shown in FIG. A computer 130 shown in FIG. 16 includes a CPU (Central Processing Unit) 132 for executing a contact analysis model creation program, a mouse 134 and a keyboard 136 for inputting shape and analysis conditions, and a memory 138 for storing data and programs. A fixed disk 140 for storing data and programs; an FD drive 142 for inputting and outputting data to and from the FD 150;
CD-ROM drive 144 for reading data from M152, and printer 146 for outputting data
, A monitor 148 for display, and the computer 130
And a network interface 154 for connecting to a network.

The CPU 132 performs processing while inputting / outputting data to / from the mouse 134, keyboard 136, memory 138, fixed disk 140, FD drive 142, CD-ROM drive 144, printer 146, monitor 148, or network interface 154. Do. The contact analysis model creation program recorded on the FD 150 or the CD-ROM 152 is transmitted to the FD drive 142 or the CD-ROM drive 144 by the CPU 132.
Via the fixed disk 140. CPU
132 loads the contact analysis model creation program from the fixed disk 140 into the memory 138 and executes the program to create the contact analysis model.

The recording media on which the contact analysis model creation program is recorded are FD150 and CD-RO.
Although M152 is shown, it is not limited to this.

As described above, according to the contact analysis model creating apparatus in the present embodiment, an evaluation model for evaluating to which part the deformation due to the load affects is generated, and the load is applied to this evaluation model. Since a simple analysis model is created by performing the evaluation by adding the above, the user can create a simple analysis model composed of only the parts that require the numerical analysis with little effort.
In addition, by performing a numerical analysis using the simplified analysis model, it is possible to reduce the calculation time required for the numerical analysis while preventing a decrease in the calculation accuracy.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a contact analysis method according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an actual model created based on a design plan.

FIG. 3 is a diagram showing a case where a load P is applied to the model shown in FIG. 2;

FIG. 4 is a block diagram illustrating a schematic configuration of a contact analysis model creation device according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating a processing procedure of the contact analysis model creation device according to the embodiment of the present invention.

FIG. 6 is a flowchart illustrating the process of step S11 in FIG. 5 in further detail.

FIG. 7 is a view showing partial parts created by dividing the real model shown in FIG. 2;

8 is a diagram showing a partial part extraction model created from the partial parts shown in FIG. 7;

FIG. 9 is a diagram showing an extracted partial part created from the partial part shown in FIG. 7;

FIG. 10 is a diagram for explaining a procedure for creating an evaluation model.

FIG. 11 is a flowchart illustrating the process of step S12 in FIG. 5 in further detail.

12 is a diagram showing a load-displacement function when a load is applied to the component 31 shown in FIG.

13 is a diagram showing a load-displacement function when the part 31 and the part 32 shown in FIG. 2 come into contact with each other.

14 is a diagram showing a load-displacement function when the displacement amount of the component 32 shown in FIG. 2 is extremely small.

FIG. 15 is a diagram showing a simplified analysis model created from the real model shown in FIG. 2;

FIG. 16 is a diagram illustrating an example of the external appearance of a computer that realizes the contact analysis model creation device.

17 is a block diagram illustrating a schematic configuration of a computer illustrated in FIG.

FIG. 18 is a flowchart for explaining a conventional numerical analysis method.

[Explanation of symbols]

1 evaluation model creation section, 2 impact evaluation section, 3 simple analysis model creation section, 130 computer, 131 computer main body, 132 CPU, 134 mouse, 13
6 Keyboard, 138 memory, 140 fixed disk, 142 FD drive, 144 CD-ROM drive, 146 printer, 148 monitor, 150F
D, 152 CD-ROM, 154 Network interface.

Claims (8)

[Claims] 1. An evaluation model creation unit for creating an evaluation model for extracting a part related to a pressing direction from an actual model to be analyzed and performing an evaluation, and the evaluation model creation unit A contact analysis model creation device, comprising: evaluation means for evaluating the created evaluation model; and contact analysis model creation means for creating a contact analysis model based on the evaluation result by the evaluation means. 2. An evaluation model creating means, comprising: a dividing means for dividing a part into partial parts; and a first means for applying a load to the partial parts divided by the dividing means to calculate a deformation amount. Calculating means; first determining means for determining whether to add the partial part to the evaluation model based on the deformation amount calculated by the first calculating means; and first determining means And a creating unit for creating the evaluation model based on the determination result by
The contact analysis model creation device described. 3. The first determining means includes means for inputting a threshold value of a deformation amount, and comparing the input threshold value of the deformation amount with the deformation amount calculated by the first calculating means. Means for determining whether or not to add the partial part to the evaluation model. 4. The evaluation means includes: a second calculation means for calculating a deformation amount by applying a load to the evaluation model; and the evaluation means based on the deformation amount calculated by the second calculation means. A second determination unit configured to determine whether to include the model in the contact analysis model.
The contact analysis model creation device according to any one of the above. 5. The apparatus according to claim 2, wherein the second determining unit compares a tolerance calculated by the second calculating unit with a unit for calculating a contact determination tolerance in the evaluation model. Means for determining whether or not to include the evaluation model in a contact analysis model. 6. The contact analysis model creation device according to claim 1, wherein the contact analysis model creation unit models a part that is less affected by the deformation of the evaluation model as a rigid body. 7. A step of extracting a part related to the pressing direction from a real model to be analyzed to create an evaluation model for performing evaluation, and a step of evaluating the created evaluation model. Creating a contact analysis model based on the evaluation result. 8. A computer-readable recording medium storing a program for causing a computer to execute a contact analysis model creation method, wherein the contact analysis model creation method comprises: A step of creating an evaluation model for extracting and evaluating a part of related components; a step of evaluating the created evaluation model; and a step of creating a contact analysis model based on the evaluation result. A recording medium on which a contact analysis model creation program is recorded.