JP2010092256A - Program of manufacturing optimal structure for component rigidity and information processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the labor of a structure design, and to achieve a highly precise structure design in the structure design of a structure using an information processor. <P>SOLUTION: A program for making an information processor execute processing for supporting the structure design of a structure includes a step (S10 to S35) for executing structure analysis by a finite element method to a structure using input data including the design information, physical property value information, constraining conditions, and loading conditions of the structure, and for selecting the weak site of the structure; a step (S40) for performing topology optimization processing by a finite element method to the selected weak site, and requesting a rigidity strengthening necessary site; a step (S45) for urging a designer to input the measure conditions of rigidity strengthening measures, and for accepting the input of the measure conditions from the designer; and a step (S50 to S55) for selecting and verifying the rigidity strengthening measures corresponding to the accepted measure conditions. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optimum structure production program for component rigidity that causes an information processing apparatus to execute a process that supports the structural design of a structure, and an information processing apparatus that supports the structural design of a structure.

  Conventionally, a computer has been used to design a structure such as an industrial product, and a program for causing the computer to analyze the rigidity of the structure and the like, and a system in which the program is mounted have been proposed.

For example, Patent Document 1 discloses a configuration of a CAE (Computer Aided Engineering) system used for product rigidity design. This CAE system obtains shape data of a three-dimensional product from a CAD device, and performs finite element division for discretizing the product into a finite area called a finite element based on the obtained shape data. Do. The CAE system performs structural analysis by a finite element method for performing structural design such as rib design and wall thickness design, and outputs the analysis results (product displacement and shape deformation). Based on the analysis result, the designer modifies the product shape at the initial stage, and designs an optimal product shape that satisfies the product specifications.
Hereinafter, the procedure of structural design using computer simulation that has been conventionally performed will be described. The computer simulation is performed by causing a computer to execute a known CAE (Computer Aided Engineering) program.

  Specifically, first, the designer performs a drawing DR (design review) using a design drawing of the structure, and the weak body considered to be a weak body part (a part that does not satisfy the predetermined rigidity standard) from the structure. Select site candidates.

Next, the designer verifies whether or not the selected weak body region candidate satisfies the stiffness criterion by using the computer simulation.
Specifically, the designer gives input data such as “design information, physical property value information, constraint conditions, load conditions, coordinate information specifying the estimated weak body part” of the structure to the computer. The computer performs structural analysis by the finite element method (rigidity CAE due to concentrated load) with a concentrated load applied to the estimated weak body region candidate using the given input data, and obtains the displacement of the structure, Information indicating the obtained displacement is output.
Then, the designer looks at information indicating the displacement of the structure output by the computer, and determines whether or not the estimated weak body region candidate is a weak body region.

Next, the designer causes the computer to execute a topology optimization process by a finite element method for the portion determined to be the weak body part, and outputs an analysis result indicating a part where the rigidity of the structure needs to be strengthened.
Then, the designer looked at the analysis results described above and considered the necessary rigidity strengthening measures (addition of ribs, increase in plate thickness, etc.), and took measures to strengthen rigidity for the parts that required rigidity strengthening. .

JP 2000-293548 A

However, the above-described structural design according to the prior art has a technical problem that it takes a lot of work and the amount of work is enormous. Therefore, the structural design of the prior art has been a heavy burden on the designer.
Specifically, in the above-described conventional technology, for each weak body part candidate selected by the designer, a computer simulation is performed, the weak body part candidate is verified, and the weak body part of the structure is specified.
Since a structure generally has a plurality of weak body parts, the designer must select a plurality of weak body parts candidates and perform simulation for each selected weak body part. The burden was enormous.
Further, in the prior art, when a plurality of weak body parts are specified, topology optimization processing (simulation) is performed for each weak body part, which is troublesome for the designer.
Further, in the prior art, it is necessary for the designer himself to select a weak body part candidate that seems to be a weak body part, and thus there is a possibility of overlooking a weak body part that requires measures for strengthening rigidity.

In addition, the analysis results obtained by the above-described topology optimization process (information indicating the part that requires rigidity strengthening) present the part that requires the rigidity strengthening measure. Since it was not presented, the designer himself was considering measures to strengthen rigidity.
However, there are a plurality of rigidity enhancement measures described above (increase in plate thickness, addition of ribs, increase in plate thickness and addition of ribs, etc.). It was difficult to select the measures to increase the rigidity.
In addition, it is a burden for the designer to select an optimum rigidity strengthening measure from among a plurality of rigidity strengthening measures.

  The present invention has been made to solve the above technical problems, and an object of the present invention is to reduce the labor of structural design and improve accuracy in the structural design of a structure using an information processing device. It is to realize a high structural design.

In order to solve the above-described problems, the present invention performs structural analysis by a finite element method using input data including structure design information, physical property value information, constraint conditions, and load conditions, and evaluates the rigidity of the structure. The present invention is applied to a part rigidity optimum structure production program that causes an information processing apparatus to execute processing to be performed.
Here, the information processing apparatus stores a database that stores a plurality of rigidity enhancement measures and countermeasure information associated with countermeasure effects for each rigidity enhancement measure for each predetermined evaluation range.
Then, the part rigidity optimum structure production program performs a structural analysis by the finite element method on the structure using the input data, and selects a weak body part of the structure, and uses the input data. Then, a topology optimization process by a finite element method is performed on the selected weak body part, and a step for obtaining a rigidity-required part where the rigidity of the structure needs to be strengthened is output. Prompting the designer to input countermeasure conditions including a countermeasure range for performing rigidity strengthening countermeasures and countermeasure effects obtained by the rigidity strengthening countermeasures, and receiving an input of the countermeasure conditions from the designer; Among the countermeasure information stored in the database, the countermeasure range included in the accepted countermeasure condition is associated with an evaluation range having a small difference, and the A step of selecting a rigidity strengthening measure that satisfies the countermeasure effect included in the secured countermeasure condition, and a portion that has applied the selected rigidity strengthening measure to the design information using the input data, and has applied the rigidity strengthening measure And performing a structural analysis by a finite element method in which a concentrated load is applied to the information processing apparatus, and causing the information processing apparatus to execute a step of verifying the rigidity enhancement countermeasure.

As described above, according to the optimum structure manufacturing program for component rigidity of the present invention, the information processing apparatus automatically obtains the rigidity-required portion where the rigidity of the structure needs to be increased, and determines the determined rigidity-required portion. A process for prompting the designer to input countermeasure conditions including a countermeasure range in which the countermeasure for strengthening the rigidity is taken and a countermeasure effect obtained by the countermeasure for enhancing the rigidity is performed. According to the present invention, when the designer inputs the countermeasure condition, the information processing apparatus automatically selects the rigidity enhancement countermeasure for the structure and verifies the selected rigidity enhancement countermeasure.
In other words, according to the present invention, the information processing apparatus automatically selects the rigidity enhancement measure for the structure and verifies the selected rigidity enhancement measure by simply performing a simple input operation by the designer. Compared with the related art, the labor of structural design is greatly reduced.
Further, according to the optimum structure manufacturing program for component rigidity of the present invention, it is possible to cause the information processing apparatus to execute processing for selecting a rigidity enhancement measure corresponding to the countermeasure condition input by the designer. That is, according to the present invention, it is not necessary for the designer himself / herself to take measures for strengthening the rigidity, so the burden on the designer who performs the structural design is reduced.

  In addition, the step of selecting the weak body part, using the input data, performs a structural analysis by a finite element method in which an equally distributed load is applied to the structure, obtains a displacement of the structure, The region where the displacement amount is the largest is identified, the identified region is estimated as a weak body part candidate, and the structural analysis is performed by a finite element method in which a concentrated load is applied to the estimated weak body part candidate. If the obtained displacement is larger than a predetermined reference, it is determined that the weak body part candidate is a weak body part. If the obtained displacement is smaller than the predetermined reference, the weak body part candidate is not a weak body part. In addition, when it is determined that the weak body part candidate is a weak body part, the estimation process and the determination are performed again after artificially increasing the rigidity of the determined weak body part. place Was carried out, it is desirable to perform the estimation and verification of the following weak region candidates.

Thus, according to the present invention, since the information processing apparatus selects the weak part of the structure without relying on the designer's own experience and knowledge, the weak part of the structure can be accurately obtained. , Work load on the designer is reduced.
In addition, according to the present invention, since the structural analysis by the finite element method is performed again after artificially increasing the rigidity of the selected weak body region, the weak body region is not included in the region other than the pseudo weak body region. It becomes possible to verify whether or not there is.
That is, according to the present invention, even when there are a plurality of weak body parts in the structure, the possibility of oversight of the weak body parts is reduced, so that a highly accurate structural design can be performed.

In order to solve the above problems, the present invention performs structural analysis by a finite element method using input data including structural design information, physical property value information, constraint conditions, and load conditions, and structural design of the structure. It is applied to an information processing device that supports
The information processing apparatus includes input means for receiving input of various data from a designer, countermeasure information in which a plurality of rigidity enhancement measures and countermeasure effects for each of the rigidity enhancement measures are associated with each other for each predetermined evaluation range. And a means for selecting a rigidity strengthening measure for the structure using the input data and the countermeasure information stored in the database, and an analysis means for verifying the selected rigidity strengthening measure, The analysis means performs a structural analysis by a finite element method on the structure using the input data, selects a weak body part of the structure, and the selected weak body part using the input data, Topology optimization processing is performed using the finite element method, and the required rigidity-enhancing parts of the structure need to be strengthened, and the calculated required rigidity-enhancing parts are output. And prompting the designer to input countermeasure conditions including a countermeasure range in which the countermeasure for strengthening the rigidity is taken and a countermeasure effect obtained by the rigidity strengthening countermeasure, and accepting the input of the countermeasure condition from the designer, From the countermeasure information stored in the section, select a rigidity strengthening countermeasure that is associated with an evaluation range that is small in difference from the countermeasure range included in the received countermeasure condition and that satisfies the countermeasure effect included in the received countermeasure condition. Using the input data, the design information is subjected to the selected rigidity strengthening measures, and the structural analysis is performed by a finite element method in which a concentrated load is applied to the portion subjected to the rigidity strengthening measures, and the rigidity strengthening measures are taken. It is characterized by verifying.

  ADVANTAGE OF THE INVENTION According to this invention, in the structural design of the structure using information processing apparatus, the effort of a structural design can be reduced and a highly accurate structural design can be implement | achieved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the functional configuration of the structure design support apparatus of the present embodiment will be described with reference to FIG.
FIG. 1 is a functional block diagram of a design support apparatus according to an embodiment of the present invention.

As shown in the figure, the design support apparatus A uses the design information of a structure such as a product (or a part constituting the product) to analyze characteristics such as rigidity of the product, and optimizes topology. An information processing apparatus 1 that performs processing, an input apparatus 2 that receives various requests from a designer, and an output apparatus 3 that outputs an analysis result performed by the information processing apparatus 1 are provided.
The information processing apparatus 1 is connected to the CAD apparatus 4 via a network NW such as a LAN (Local Area Network).

The information processing apparatus 1 performs a structural analysis by a finite element method using input data including structure design information, physical property value information, constraint conditions, and load conditions, obtains a displacement of the structure, and calculates the displacement from the displacement. Extract weak parts of structures.
In addition, if there is a weak body part in the structure by the structural analysis, the information processing apparatus 1 further executes a topology optimization process by a finite element method, outputs the analysis result to the output device 3, and designs Encourage people to strengthen the rigidity of the structure.
In addition, the information processing apparatus 1 selects a rigidity enhancement measure (thickness increase, rib addition, etc.) for a portion (region) where the rigidity of the structure needs to be strengthened, and further, the structure has a rigidity standard based on the selected rigidity enhancement measure. It is verified whether it came to satisfy | fill.

The input device 2 includes a keyboard, a mouse, and the like, and receives various requests from the designer, analysis conditions (physical property value information, constraint conditions, load conditions) and the like and outputs them to the information processing apparatus 1.
The output device 3 is configured by a liquid crystal display or the like, and displays image information output from the information processing device 1.
The CAD device 4 stores CAD information (for example, design information of automobile component parts) of a structure to be subjected to structural analysis. Then, the CAD device 4 outputs CAD information to the information processing device 1 in accordance with a request from the information processing device 1.
Hereinafter, a specific configuration of the design support apparatus A will be described. Note that the CAD device 4 of the present embodiment is realized by a known technique, and thus detailed description thereof is omitted.

The information processing apparatus 1 includes a control unit 10, a data acquisition unit 20, a structure analysis unit 30, an output unit 40, and a rigidity enhancement countermeasure database 45.
The control unit 10 controls the overall operation of the information processing apparatus 1. In addition, the control unit 10 receives various requests input by the designer via the input device 2. Then, according to the received request, the control unit 10 controls the data acquisition unit 20, the structure analysis unit 30, and the output unit 40 to perform processing according to the request from the designer.

The data acquisition unit 20 communicates with an external device (for example, the CAD device 4) connected to the network NW, and exchanges data with the external device. For example, the data acquisition unit 20 accesses the CAD device 4 via the network NW and acquires design information (CAD information) stored in the CAD device 4.
Further, the data acquisition unit 20 receives an input of “analysis conditions (physical property value information, constraint conditions, load conditions)” of the structure to be analyzed, which is input by the designer via the input device 2.

The structural analysis unit 30 executes the processing steps of FIG. 5 to be described later using “structural design information”, “structural analysis conditions”, etc. (Part)), select the rigidity strengthening measure for the required rigidity strengthening part, and verify the rigidity strengthening measure.
The output unit 40 acquires an analysis result from the structure analysis unit 30, generates image information (for example, information shown in FIG. 6) indicating the analysis result, and outputs the generated image information to the output device 3.

The rigidity enhancement countermeasure database 45 is a database in which information indicating reinforcement countermeasures for enhancing the rigidity of a structure is registered. In the rigidity strengthening countermeasure database 45, for each predetermined evaluation range (for each evaluation target area), various strengthening countermeasures for satisfying a predetermined rigidity criterion and the effects of the strengthening countermeasures are associated with each other.
As will be described later, the data registered in the rigidity strengthening countermeasure database 45 is obtained, for example, by computer simulation performed on a virtually assumed analysis model.

Next, a hardware configuration of the information processing apparatus 1 according to the present embodiment will be described.
FIG. 2 is a hardware configuration diagram of the information processing apparatus according to the present embodiment.
As shown in the figure, the information processing apparatus 1 is composed of a CPU (Central Processing Unit) 50, a main storage device 51 composed of a RAM (Random Access Memory), an I / O interface 52, a hard disk, and the like. It has an auxiliary storage device 53 and a network interface 54 that controls data exchange between devices connected to the network NW.
The auxiliary storage device 53 also has a program (optimized structure production program 55 for component rigidity) for realizing the functions of the above-described units (the control unit 10, the data acquisition unit 20, the structure analysis unit 30, and the output unit 40). Is stored. The auxiliary storage device 53 stores the rigidity enhancement countermeasure database 45 described above.

  And the function of each part (the control part 10, the data acquisition part 20, the structure analysis part 30, and the output part 40) of the information processing apparatus 1 is the optimal structure production program of the part rigidity which CPU50 is stored in the auxiliary storage device 53. This is realized by loading 55 into the main storage device 51 and executing it.

Next, the data configuration of the rigidity enhancement countermeasure database 45 of this embodiment will be described with reference to FIG.
FIG. 3 is a diagram schematically illustrating the data configuration of the rigidity enhancement countermeasure database according to the present embodiment.

As shown in the figure, in the rigidity strengthening countermeasure database 45, a rigidity application range 453 and a strengthening countermeasure 454 are associated with each type of structure (for each part ID 451) and for each structure evaluation range 452. The illustrated rigidity enhancement countermeasure database 45 is created for each plate thickness of the structure.
Here, the component ID 451 is information for identifying the type of structure (instrument panel, front bumper, rear bumper, etc.). The evaluation range 452 refers to a target range in which measures for strengthening the rigidity of the structure are taken.
The rigidity application range 453 refers to the range of rigidity strength of a structure to which the rigidity strengthening countermeasure 454 associated with the rigidity application range 453 is applied (structure before the rigidity strengthening countermeasure).

Further, the strengthening measure 454 includes information indicating specific contents (items) of the strengthening measure applicable to the evaluation range 452 and information indicating an effect (countermeasure effect) when the strengthening measure is applied. .
In the example shown in the figure, “plate thickness increase”, “rib addition”, and “combination of plate thickness increase and rib addition” are registered as information indicating the contents (items) of the strengthening measures. Also, “plate thickness increase”, “rib addition”, and “combination of plate thickness increase and rib addition” are registered in plural types.
For example, multiple “measures to increase the plate thickness” are registered as the “plate thickness increase” item. For each “measure to increase the plate thickness”, the effect (measure effect) ) Are associated with each other.

Further, for example, as an item of “add rib”, for each number of ribs to be added, the “height” of the rib and the “plate thickness” of the rib are associated with each other. Information indicating the effect (measure effect) by “adding ribs” is associated.
Further, as a “measure effect” when the rigidity enhancement measure is taken, the displacement of the structure (instrument panel) when a predetermined concentrated load is applied to the evaluation range after the rigidity enhancement measure is taken is registered.
In the present embodiment, the method for creating data stored in the rigidity strengthening countermeasure database 45 is not particularly limited. For example, for the “virtually assumed analysis model B” illustrated in FIG. You may make it obtain | require by the structural analysis (rigidity analysis) by the finite element method to perform.

  Specifically, a substantially plate-like analysis model B (the number of constraints shown in the figure is an example) is created, and the analysis model is analyzed for each area (evaluation range (L (mm) × W (mm))) of the analysis model B. A structural analysis (stiffness analysis) is performed by a finite element method in which a concentrated load F is added to Z, and a displacement (z1 (mm)) of the analysis model B is obtained. Is “a (mm)”.

If the obtained displacement (z1 (mm)) does not satisfy the target displacement (if z1> a (mm)), the analysis model B (its evaluation range (L (mm) × W (mm)) The analysis model W) is subjected to a structural analysis by the finite element method after various assumed strengthening measures are taken, and the effect of the measures is verified for each strengthening measure.
That is, possible strengthening measures are sequentially applied to the analysis model B (performed for each evaluation range (L (mm) × W (mm)), and the concentrated load F is applied to the analysis model W that has been strengthened. A structural analysis (rigidity analysis) is performed by a finite element method, and a displacement (z2 (mm)) of the analysis model W is obtained.
When the obtained displacement (z2 (mm)) satisfies the target displacement (stiffness standard) (z2 ≦ a (mm)), its “analysis model B” and “strengthening measure, displacement (z2 (mm))” are Then, it is registered in the rigidity strengthening countermeasure database 45 (displacement (z2 (mm)) is registered as a countermeasure effect). In this case, “strengthening measure, displacement (z2 (mm))” is associated as the strengthening measure 454 with the evaluation range (L (mm) × W (mm)) of the analysis model B.

Next, a structure design support process performed by the design support apparatus A of the present embodiment will be described with reference to FIG.
FIG. 5 is a flowchart showing the procedure of the structure design support process performed by the design support apparatus according to the embodiment of the present invention.
Prior to the illustrated processing steps, the information processing apparatus 1 that constitutes the design support apparatus A includes design information on the structure to be designed and analysis conditions (physical property value information, constraint conditions, load conditions) of the structure. ) And are entered. That is, the design information and analysis conditions of the structure are stored in the memory (the main storage device 51 or the auxiliary storage device 53) of the information processing apparatus 1.
Further, the finite element method used in the following processing steps is the same as a well-known one.

First, the data acquisition unit 20 of the information processing apparatus 1 accepts designation of a structure (part) to be structurally designed input by the designer via the input device 2 (S10).
For example, the data acquisition unit 20 causes the output unit 40 to display a “selection screen for accepting selection of a structure (part) to be structurally designed” on the output device 3 via the output unit 40, and the designer refers to the selection screen. However, it accepts the designation of the input component.
Here, it is assumed that the designation of “instrument panel” is accepted as the structural design target part.

  Next, the structure analysis unit 30 of the information processing apparatus 1 uses the “structure (instrument) design information” and “analysis conditions of the structure (instrument)” stored in the memory to store predetermined information on the instrument panel. Perform structural analysis by the finite element method with an evenly distributed load (stiffness CAE by an evenly distributed load), determine the displacement of the instrument panel, and use the displacement as a candidate for the weak body part of the instrument panel (part that does not meet the specified rigidity criteria) (Weak body part candidate) "is estimated (S15).

Specifically, the structural analysis unit 30 has a uniform distribution load in a direction substantially orthogonal to the design surface of the instrument panel, with respect to the instrument panel one surface (for example, a design surface arranged on the vehicle compartment side) formed in a substantially plate shape. Structural analysis is performed by a finite element method to which (x1 (N)) is added, and the displacement (Z1 (mm)) of the design surface of the instrument panel 100 is obtained.
And the structure analysis part 30 specifies the area | region (part | part) with the largest displacement amount among the calculated | required instrument panel displacements, and estimates the specified area | region (part | part) as a weak body part candidate of an instrument panel. That is, in this step (S15), one weak body part candidate is estimated.
In S15, the structure analysis unit 30 sends the above analysis results (information indicating instrument panel displacement and information indicating weak body region candidates) to the output unit 40, and causes the output unit 40 to display the analysis results. May be.

  Next, the structure analysis unit 30 uses the “structure (instrument) design information” and “structure (instrument) analysis conditions” stored in the memory to perform the weak body site candidate estimated in S15. Then, structural analysis (rigidity CAE due to concentrated load) by a finite element method to which a predetermined concentrated load (x2 (N)) is applied is performed to obtain the instrument panel displacement (Z2 (mm)) (S20).

Next, the structure analysis unit 30 determines whether or not the obtained displacement (Z2 (mm)) has achieved a predetermined target value (S25).
For example, when the target value is defined as “within a (mm)”, the structural analysis unit 30 determines whether the displacement (Z2 (mm)) obtained in this step is within the target value (a (mm)). Determine whether or not.

  In S25, if the displacement (Z2) is larger than the target value (a (mm)) (Z2> a), the structure analysis unit 30 proceeds to S30. That is, if the obtained displacement (Z2 (mm)) has not reached the predetermined target value (if the displacement is larger than the target value), the structural analysis unit 30 determines that the weak body region candidate estimated in S15 is the weak body region. And the process proceeds to S30.

On the other hand, in S25, if the obtained instrument panel displacement (Z2) is within the target value (a (mm)) (Z2 ≦ a), the structure analysis unit 30 proceeds to S40.
That is, if the obtained displacement (Z (mm)) has reached the predetermined target value (if the displacement is smaller than the target value), the structural analysis unit 30 determines that the weak body part candidate estimated in S10 is the weak body part. If not, the process proceeds to S40.
In S25, the structure analysis unit 30 sends the analysis result (information indicating the displacement of the instrument panel 100) in this step to the output unit 40, and causes the output unit 40 to execute the analysis result display process. Good.
For example, the structure analysis unit 30 causes the output device 3 to display an analysis result screen 110 as shown in FIG. Thereby, the designer can recognize the position of the weak body part of the instrument panel.
In addition, in FIG. 6, the code | symbol 100 points to the instrument panel and the code | symbol 101 points to the weak body site | part recognized.

Returning to FIG. 5, the process of S30 descending that proceeds when the instrument panel displacement (Z2 (mm)) obtained in S25 is larger than a predetermined target value will be described.
In S30, the structural analysis unit 30 recognizes the weak body part candidate estimated in S15 as a weak body part, and stores (registers) information indicating the recognized weak body part in the predetermined area of the memory, and proceeds to S35.
The information indicating the weak body part includes at least the position information of the weak body part candidate estimated in S15 and the displacement obtained in S20 (displacement obtained by performing rigidity CAE with a concentrated load applied to the weak body part candidate). .

In S35, the structural analysis unit 30 artificially increases the rigidity of the weak body part recognized in S30 (for example, increases the constraint on the weak body part or increases the thickness of the weak body part), and again in S15. Returning to the processing, the instrument panel weak body region candidate is estimated.
That is, in S15 performed after S35, after the rigidity of the weak body part recognized in S30 is increased, the rigidity CAE by the equally distributed load is performed again.
As described above, in S35, after the pseudo weak body part is increased in rigidity, the process returns to S15 again, and by estimating the instrument panel weak body part candidates, regions other than the weak body part subjected to the rigidity increase are newly created. It is estimated as a weak body part candidate.

And in this embodiment, the process of S15-S35 is repeated until the displacement (Z2 (mm)) of the instrument panel calculated | required by rigidity CAE which added the concentrated load to the weak body site | part candidate estimated by S15 satisfy | fills a predetermined target value. It is.
Therefore, according to this embodiment, even if there are a plurality of weak body parts in the structure, the plurality of weak body parts can be accurately extracted without omission.

As described above, according to the present embodiment, the design support apparatus A automatically extracts a plurality of weak body parts, so that the labor of selecting the weak part of the structure is reduced.
That is, according to the present embodiment, unlike the prior art, it is not necessary to perform a computer simulation for each weak body part predicted by the designer and verify the weak body part.

Next, the process after S40 that is performed when the instrument panel displacement obtained in S20 is within the target value will be described.
In S40, the structural analysis unit 40 performs a topology optimization process by a finite element method with a predetermined weight on the weak body part identified in S30, and a part that requires rigidity reinforcement (part where rigidity reinforcement is necessary). )

Specifically, the structure analysis unit 40 uses the information indicating the weak body part stored in the predetermined area of the memory and the input data (instrument panel design information, instrument panel analysis conditions) in S30. Topology optimization processing is performed by the finite element method for all the weak body parts that have been recognized.
In other words, in the present embodiment, when there are a plurality of weak body parts, topology optimization processing is not performed for each weak body part (for example, if there are four weak body parts, the topology optimization is performed four times for each part in total. Rather than performing the optimization process), the topology optimization process is performed on all weak body parts at once to obtain the rigidity-required parts.
This topology optimization process is performed after weighting is applied to each weak body part according to the respective displacement amount (displacement amount obtained in S205) and the stress, strain, etc. generated by the assembly surrounding it. Is called.

The reason why the topology optimization process for all weak body parts is performed in this way is to eliminate the adverse effects caused when the topology optimization process is performed for each weak body part.
More specifically, for example, if topology optimization processing is performed for each weak body part, and the analysis results are referred to and strengthening measures such as addition of ribs and increase in plate thickness are taken, the rigidity enhancement obtained for each weak body part is obtained. Necessary parts may overlap. And if the reinforcement measures were taken for each weak body part, the rigidity enhancement measures that would be excessive quality were sometimes taken.

  Therefore, in this embodiment, each weak body part is weighted according to the respective displacement amount (displacement amount obtained in S20), the stress generated from the assembly surrounding it, the strain, and the like. By performing the topology optimization process for the weak body part, it was made to prevent the rigidity strengthening which becomes excessive quality from being performed.

  When the topology optimization process of S40 is completed, the structure analysis unit 30 displays the analysis result obtained by the topology optimization process on the output device 3 via the output unit 40, and also requires measures for strengthening rigidity. The range is accepted (S45), and the process proceeds to S50.

Specifically, in S <b> 45, the structure analysis unit 30 displays an analysis result confirmation screen 120 (see FIG. 7) for receiving “stiffness countermeasure conditions” on the output device 3.
Here, the analysis result confirmation screen 120 shown in FIG. 7 will be described.
In the analysis result confirmation screen 120 shown in the figure, information indicating the rigidity-required portion 102 of the instrument panel 100, and input acceptance information for prompting input of “measure range (range where rigidity enhancement measures are taken) and measure effect (desired effect)” 111 is included.
In S45, the “measure effect (desired effect)” received from the designer is not particularly limited. For convenience of explanation, either “maximum (Max)” or “minimum (Min)” is received. Take as an example.
Thus, by displaying the analysis result confirmation screen 120, it is possible to prompt the designer to recognize the portion requiring rigidity enhancement and to take measures for strengthening rigidity.

Then, the designer views the analysis result confirmation screen 120 (FIG. 7) displayed on the output device 3 through the input device 2 to the information processing device 1 with “stiffness enhancement countermeasure range” and “stiffness enhancement”. Enter “Measures effect by measures (desired effect)”.
For example, the designer operates the input device 2, designates “stiffening countermeasure range” with the cursor 112 on the analysis result confirmation screen 120, and inputs it to the information processing device 1. For example, the designer operates the input device 2 to select a desired countermeasure effect from the countermeasure effects presented in the input reception information 111 and inputs the selected countermeasure effect to the information processing apparatus 1.

  Specifically, the designer inputs “maximum (Max)” when he / she wants a stiffness enhancement measure that provides the highest stiffness at the stiffness enhancement portion among the stiffness enhancement measures satisfying a predetermined stiffness criterion. On the other hand, the designer inputs “Min” when he / she wants a rigidity strengthening measure that makes the rigidity of the rigidity strengthened portion the lowest among the rigidity strengthening measures satisfying the predetermined rigidity standard.

Returning to FIG. 5, the description will be continued.
In S50, the structural analysis unit 30 uses the “displacement” obtained in S20, the “measure range” and “measure effect (desired effect)” received in S45, and the rigidity enhancement countermeasure database 45 (see FIG. 3). In addition, the shape of the rigidity enhancement measure is selected, and the selected rigidity enhancement measure is reflected in the design information of the structure (here, “instrument panel”).

Specifically, in S50, the structure analysis unit 30 stores data related to the part (here, “instrument panel”) received in S10 from the rigidity enhancement countermeasure database 45 (data associated with the part ID indicating the received part). ).
In addition, the structure analysis unit 50 includes, from the extracted data, an “evaluation range 452” corresponding to the “measure range” received in S45, and a “rigidity application range 453” in which the “displacement” obtained in S20 enters. The “strengthening measure 453” associated with is selected (for example, the strengthening measure surrounded by the broken line 460 in FIG. 3 is selected).
The “evaluation range 452” corresponding to the “measure range” received in S45 refers to the “evaluation range 452” that is closest to the “measure range” received in S45 (for example, “measure range”). ”(Which means“ evaluation range 452 ”having the smallest absolute value of“ measure range ”−“ evaluation range ”)).
Further, the “rigidity application range 453” in which the “displacement” obtained in S20 enters is, for example, “the rigidity application range” when the “displacement is“ 2b (mm): b is an integer other than 0 ”” obtained in S20. A range 453 refers to a case such as “b (mm) to 3 b (mm)”.

  Then, the structural analysis unit 30 extracts a strengthening measure satisfying the “measure effect (desired effect)” received in S45 from the selected strengthening measures, and applies the extracted strengthening measure to the structure (instrument). Decide on measures to strengthen rigidity.

For example, if the “measure effect (desired effect)” received in S45 is “Min”, the strengthen measure having the smallest measure effect is selected from the selected strengthen measures (for example, the broken line in FIG. 3). The reinforcement measures surrounded by the broken line 461 are extracted from the reinforcement measures surrounded by 460). For example, if the “measure effect (desired effect)” received in S45 is “Max”, the reinforcement measure having the largest measure effect is selected from the selected enhancement measures.
Then, the structure analysis unit 30 applies the selected strengthening measure to the design information of the structure (here, “instrument panel”), and proceeds to the process of S55.

  In S55, the structural analysis unit 30 performs a structural analysis (concentration) by a finite element method in which a predetermined concentrated load (x2 (N)) is applied to the portion (strengthened portion) on which the rigidity strengthening measures performed in S55 are performed. Rigidity CAE by load) is performed, the displacement (Z2 (mm)) of the structure (instrument panel) is obtained, the rigidity strengthening measures are verified, and the verification result is output to the output device 3.

  Thus, according to the present embodiment, the design support device A automatically performs the processing of S10 to S40 only by designating the target structure to the structural design support device A by the designer (S10). The part where the rigidity reinforcement measures of the structure are necessary is presented.

Further, according to the present embodiment, in S45, the design support apparatus A automatically receives the input of the “range where the rigidity enhancement countermeasure is desired (evaluation range)” and “the countermeasure effect of the rigidity enhancement countermeasure” from the designer. Specifically, the rigidity enhancement countermeasure is selected from the rigidity enhancement countermeasure database 45, the rigidity enhancement countermeasure is applied to the design information of the structure, and the rigidity countermeasure is verified (confirmed).
In other words, according to the present embodiment, the design support device A automatically executes the rigidity strengthening measures for the structure by simply performing a simple input operation by the designer, so that the effort for structural design of the structure is reduced. The

Moreover, according to this embodiment, the design support apparatus A automatically extracts the weak part of a structure only by receiving the designation of the structure (S10 to S35).
That is, in this embodiment, unlike the prior art, it is not necessary for the operator to estimate the weak body part, and thus oversight of the weak body part is prevented, and a highly accurate structural design is realized.

Further, according to the present embodiment, when the design support apparatus A receives input from the designer of “range to which rigidity enhancement measures are to be applied (evaluation range)” and “measure effect of rigidity enhancement measures”, The database 45 is configured to select a rigidity enhancement measure corresponding to the input condition from the database 45.
Therefore, according to the present embodiment, a countermeasure for strengthening rigidity is required only by a designer inputting “evaluation range” and “effect of countermeasures for rigidity strengthening” to the design support apparatus A. That is, according to the present embodiment, it is not necessary for the designer himself / herself to consider measures for strengthening the rigidity, so that the work load on the designer is reduced.

  As described above, when the structural design of the structure is performed using the design support apparatus A of the present embodiment, even if the designer has little skill and design experience, the predetermined rigidity standard is satisfied. Simple structures can be designed.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible within the range of the summary.

For example, in the rigidity strengthening countermeasure database 45 of the above-described embodiment, the displacement of the structure when a predetermined concentrated load is applied to the evaluation range after applying the strengthening countermeasure is registered as the “countermeasure effect”. The invention is not particularly limited to this. As a countermeasure effect registered in the rigidity strengthening countermeasure database 45, in addition to the displacement of the structure, the cost of the rigidity strengthening countermeasure may be registered.
With this configuration, if a condition regarding cost (for example, the lowest cost) is received from the designer in S45 of FIG. 5, a strengthening measure that satisfies the condition regarding the cost desired by the designer is obtained in S50. Will be selected. That is, it is possible to take a rigidity enhancement measure considering the cost without imposing a large work burden on the designer.

  In the design support apparatus A of the above-described embodiment, one information processing apparatus 1 performs various processes for structural design support. However, the present invention is not limited to this. You may make it implement | achieve the function of each part (The control part 10, the data acquisition part 20, the structure analysis part 30, and the output part 40) mentioned above with the system comprised by the some computer.

It is a functional block diagram of the design support apparatus of the embodiment of the present invention. It is a hardware block diagram of the information processing apparatus of embodiment of this invention. It is the figure which illustrated simulated the data structure of the rigidity reinforcement countermeasure database of embodiment of this invention. It is the figure which illustrated the analysis model for creating the rigidity reinforcement countermeasure database of embodiment of this invention. It is the flowchart which showed the procedure of the design support process of the structure which the design support apparatus of embodiment of this invention performs. It is the figure which showed an example of the analysis image which the design assistance apparatus of embodiment of this invention displays. It is the figure which showed an example of the analysis image which the design assistance apparatus of embodiment of this invention displays.

Explanation of symbols

A ... Design support device B ... Analysis model 1 ... Information processing device 2 ... Input device 3 ... Output device 4 ... CAD device 10 ... Control unit 20 ... Data acquisition unit 30 ... Structural analysis unit 40 ... Output unit 45 ... Stiffness enhancement countermeasure DB
50 ... CPU
DESCRIPTION OF SYMBOLS 51 ... Main memory 52 ... I / O interface 53 ... Auxiliary memory 54 ... NW interface 55 ... Optimal structure production program of component rigidity

Claims (3)

A component that performs structural analysis by the finite element method using input data including design information, physical property value information, constraint conditions, and load conditions of a structure, and causes the information processing apparatus to execute processing that supports the structural design of the structure An optimum structure manufacturing program for rigidity,
The information processing apparatus stores a database storing countermeasure information associated with a plurality of rigidity enhancement measures and countermeasure effects for each rigidity enhancement measure for each predetermined evaluation range,
The optimum structure production program for the component rigidity is
Performing structural analysis by a finite element method on the structure using the input data, and selecting a weak body part of the structure;
Using the input data, with respect to the selected weak body part, performing a topology optimization process by a finite element method, obtaining a rigidity strengthening necessary part that requires rigidity strengthening of the structure;
The required part for rigidity enhancement is output, and the designer is prompted to input countermeasure conditions including a countermeasure range for the rigidity enhancement countermeasure and a countermeasure effect obtained by the rigidity enhancement countermeasure. Receiving an input of the countermeasure condition;
From the countermeasure information stored in the database, a rigidity strengthening countermeasure that is associated with an evaluation range having a small difference from the countermeasure range included in the received countermeasure condition and that satisfies the countermeasure effect included in the received countermeasure condition. A selection step;
Using the input data, apply the selected rigidity strengthening measures to the design information, and perform structural analysis by the finite element method in which concentrated load is applied to the portion subjected to the rigidity strengthening measures, and verify the rigidity strengthening measures And a step of causing the information processing apparatus to execute an optimal structure manufacturing program for component rigidity. The step of selecting the weak body part includes
Using the input data, structural analysis is performed by a finite element method in which an equally distributed load is applied to the structure, the displacement of the structure is obtained, and the region having the largest displacement amount is specified among the displacements. , An estimation process for estimating the identified area as a weak body part candidate,
Perform structural analysis by a finite element method in which a concentrated load is applied to the estimated weak body part candidate, determine the displacement of the structure, and if the obtained displacement is greater than a predetermined reference, the weak body part candidate is a weak body part A determination process for determining that the weak body part candidate is not a weak body part if the determined displacement is smaller than a predetermined reference;
Furthermore, when it is determined that the weak body part candidate is a weak body part, the rigidity of the determined weak body part is artificially increased, and then the estimation process and the determination process are performed again, and the next weak body part candidate is determined. The optimal structure manufacturing program for component rigidity according to claim 1, wherein estimation and verification of the component rigidity are performed. An information processing device that performs structural analysis by a finite element method using input data including structural design information, physical property value information, constraint conditions, and load conditions, and supports structural design of the structure,
Input means for receiving input of various data from the designer;
For each predetermined evaluation range, a database storing a plurality of rigidity enhancement measures and countermeasure information associated with countermeasure effects for each of the rigidity enhancement measures;
Using the input data and the countermeasure information stored in the database, selecting a rigidity strengthening measure for the structure, and comprising an analysis means for verifying the selected rigidity strengthening measure,
The analysis means includes
Perform structural analysis by the finite element method on the structure using the input data, and select a weak body part of the structure. Using the input data, the finite element method is applied to the selected weak body part. Topology optimization processing is performed, and the rigidity strengthening necessary part where the structure needs to be strengthened is obtained.
The required part for rigidity enhancement is output, and the designer is prompted to input countermeasure conditions including a countermeasure range for the rigidity enhancement countermeasure and a countermeasure effect obtained by the rigidity enhancement countermeasure. Receiving the input of the countermeasure condition,
From the countermeasure information stored in the database, a rigidity strengthening countermeasure that is associated with an evaluation range having a small difference from the countermeasure range included in the received countermeasure condition and that satisfies the countermeasure effect included in the received countermeasure condition. Select
Using the input data, apply the selected rigidity strengthening measures to the design information, and perform structural analysis by the finite element method in which concentrated load is applied to the portion subjected to the rigidity strengthening measures, and verify the rigidity strengthening measures An information processing apparatus characterized by:

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