WO2020008660A1 - Dispositif d'analyse de contrainte - Google Patents

Dispositif d'analyse de contrainte Download PDF

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Publication number
WO2020008660A1
WO2020008660A1 PCT/JP2018/038380 JP2018038380W WO2020008660A1 WO 2020008660 A1 WO2020008660 A1 WO 2020008660A1 JP 2018038380 W JP2018038380 W JP 2018038380W WO 2020008660 A1 WO2020008660 A1 WO 2020008660A1
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WO
WIPO (PCT)
Prior art keywords
node
stress
value
nodes
analysis device
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PCT/JP2018/038380
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English (en)
Japanese (ja)
Inventor
大輔 石原
勝 早川
哲也 田辺
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本田技研工業株式会社
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Publication of WO2020008660A1 publication Critical patent/WO2020008660A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Definitions

  • the present invention relates to a stress analysis device, and more particularly, to a stress analysis device that performs a stress analysis by dividing an analysis model into meshes by a finite element method.
  • the analysis model of the components, etc. is divided into meshes by the finite element method, and each mesh is colored with a color corresponding to the stress value.
  • a method of creating a stress contour diagram by using is known.
  • Patent Document 1 discloses a stress analysis method in which, when a periodic region is present in an analysis model that is mesh-divided by the finite element method, the mesh of the periodic region is roughly cut back to reduce the calculation load of the stress analysis. An apparatus is disclosed.
  • stress contour diagrams are effective for grasping the state of stress distribution.However, when studying the optimization of component shapes using these stress contour diagrams, it is particularly important to study parts where large stress is acting. You may want to confirm specific stress values.
  • the conventional stress analysis device it is necessary to click the corresponding mesh on the screen to display the stress value acting on each mesh, and as the shape of the analysis model becomes more complicated, the stress value becomes smaller. There has been a problem that the checking operation tends to be complicated.
  • An object of the present invention is to provide a stress analysis device that solves the above-mentioned problems of the related art and enables a study of an analysis model after stress analysis to be performed with a smaller number of work steps.
  • the present invention provides a meshing operation unit (3) for dividing an analysis model (2) into a plurality of meshes (M) and a node (N) constituting the mesh (M).
  • the meshing calculation unit (3) includes all nodes (M) constituting the plurality of meshes (M).
  • a node group extraction processing unit (5) that sets a node number to N) and extracts a plurality of node groups (G1, G2, G3) from all nodes (N) for which the stress value ( ⁇ ) has been calculated.
  • the node group extraction processing unit (5) sequentially compares nodes adjacent to the selected node with a stress value ( ⁇ ) acting on the node (N) and a predetermined lower limit ( ⁇ 1). And the stress value ( ⁇ )
  • the first characteristic is that the plurality of node groups (G1, G2, G3) are extracted by setting a section in which nodes (N) in which is equal to or more than the lower limit value ( ⁇ 1) continues as a common group. .
  • the node group extraction processing unit (5) extracts the node group (G1, G2, G3) after excluding the node (N) in which the stress value ( ⁇ ) is less than the lower limit value ( ⁇ 1). At the point where the node (N) where the stress value ( ⁇ ) switches below the lower limit value ( ⁇ 1) is set as the boundary (B) of the node group (G1, G2, G3).
  • the node group extraction processing unit (5) excludes the nodes (N) whose stress value ( ⁇ ) is equal to or more than a predetermined upper limit value ( ⁇ 2) from marking targets and performs processing. Has a third feature.
  • the node group extraction processing unit (5) excludes the node (N) to which at least one of a load condition, a constraint condition, a welding condition, and a component internal condition is assigned, and then removes the node group (
  • a fourth feature is that the extraction of G1, G2, G3) is performed.
  • the comparison between the stress value ( ⁇ ) of the node (N) and the lower limit ( ⁇ 1) is performed starting from the node (N) as a seed point selected from all the nodes (N).
  • the point has a fifth characteristic.
  • 6A sixth feature is that the analysis model (2) is CAD data of a component part of a vehicle.
  • a result storage system (8) that automatically creates an image (P) of the same scale and the same angle based on the result data (10) that has been processed by the node group extraction processing unit (5) is provided. There are seven features.
  • a meshing operation unit (3) for dividing the analysis model (2) into a plurality of meshes (M), and a stress value (N) acting on a node (N) constituting the mesh (M) and a stress analysis unit (4) for calculating ⁇ ) the meshing calculation unit (3) includes a node for all nodes (N) constituting the plurality of meshes (M).
  • the extraction processing unit (5) sequentially compares nodes adjacent to the selected node with a stress value ( ⁇ ) acting on the node (N) and a predetermined lower limit ( ⁇ 1), The stress value ( ⁇ ) is equal to the lower limit value ( ⁇ ).
  • Is set as a common group and the plurality of node groups (G1, G2, G3) are extracted. Therefore, a plurality of nodes from which all stress values have been calculated are extracted. By extracting the node groups, it is easy to derive the maximum stress value for each node group.
  • the node group extraction processing unit (5) excludes the node (N) in which the stress value ( ⁇ ) is less than the lower limit ( ⁇ 1), and then removes the node group (G1, G2, G3) is extracted, and the node (N) where the stress value ( ⁇ ) switches below the lower limit value ( ⁇ 1) is set as the boundary (B) of the node group (G1, G2, G3). Therefore, in the node group in which the stress value decreases from the center having the high stress value toward the outside, the boundary forming the outer edge of the node group can be easily set.
  • the node group extraction processing unit (5) excludes the node (N) in which the stress value ( ⁇ ) is equal to or larger than a predetermined upper limit value ( ⁇ 2) from marking targets. Therefore, since the processing is performed, an excessive stress value considered to be caused by a singular point can be excluded, and the maximum stress value displayed on the screen can be kept within an appropriate range.
  • the node group extraction processing unit (5) excludes the node (N) to which at least one of a load condition, a constraint condition, a welding condition, and a component internal condition is assigned. Since the extraction of the node groups (G1, G2, G3) is executed, the portion where the stress value changes due to special conditions is excluded in advance, so that the calculation load when extracting the node groups can be reduced. It becomes possible.
  • the comparison between the stress value ( ⁇ ) of the node (N) and the lower limit ( ⁇ 1) is performed by selecting the node (N) as a seed point selected from all the nodes (N). , The comparison process is sequentially performed from the node adjacent to the seed point to the next node, so that the node group can be extracted quickly. In addition, by selecting a plurality of seed points, extraction of a plurality of node groups can proceed in parallel to reduce the calculation time.
  • the analysis model (2) is CAD data of a component part of a vehicle
  • a stress analysis for extracting a node group is performed using CAD data created at the time of designing the component part. It is possible to execute. Thereby, for example, stress analysis of a component having a complicated shape such as a body frame of a motorcycle becomes easy.
  • a result storage system (8) that automatically creates images (P) of the same scale and the same angle based on the result data (10) that has been processed by the node group extraction processing unit (5).
  • FIG. 1 is a block diagram illustrating a stress analyzer according to an embodiment of the present invention and a peripheral configuration thereof. It is a conceptual graph which shows the relationship between each node and a stress value. It is a conceptual diagram which shows the technique which excludes non-evaluation data.
  • FIG. 9 is a conceptual diagram illustrating a technique for extracting a plurality of node groups from analysis data.
  • FIG. 7 is a conceptual diagram showing a procedure for extracting a node group. It is a conceptual diagram of the extracted node group. It is a flow chart which shows the procedure of stress analysis processing by a stress analysis device.
  • FIG. 4 is a stress contour diagram created based on data obtained by performing a stress analysis by a stress analysis device. It is a display example of a stress contour diagram at the time of studying optimization of a part shape.
  • FIG. 1 is a block diagram showing a stress analysis device 1 according to an embodiment of the present invention and its peripheral configuration.
  • the stress analysis device 1 is a computer that analyzes stress acting on a component or the like of a vehicle, and is connected to a CAD system or the like that creates design data of the component or the like.
  • the stress analysis device 1 includes a meshing operation unit 3, a stress analysis unit 4, and a node group extraction processing unit 5.
  • the meshing operation unit 3 divides the component data 2 as an analysis model created by a CAD system or the like into a plurality of meshes M by a finite element method. In the present embodiment, a tetrahedral quadratic element in which one mesh M is composed of ten nodes N is applied.
  • the meshing operation unit 3 sets a continuous node number for all nodes N constituting the mesh M.
  • the node information on each node N also includes the node number of the adjacent node N.
  • the stress analysis unit 4 calculates a stress value ⁇ acting on all the nodes N constituting the mesh M, thereby executing a stress analysis of the component data 2. This makes it possible to color each mesh M with a color corresponding to the stress value ⁇ acting on the node N, and visually check the stress distribution state.
  • the node group extraction processing unit 5 extracts a plurality of node groups from all the nodes N for which the stress values ⁇ have been calculated. More specifically, the node adjacent to the selected node is sequentially compared with the stress value ⁇ acting on the node N and a predetermined lower limit value ⁇ 1. By setting the subsequent section as a common group, a plurality of node groups are extracted.
  • the non-evaluation data exclusion processing unit 6 included in the node group extraction processing unit 5 excludes, from the analysis data, the node N whose stress value ⁇ is less than the lower limit ⁇ 1 before executing the node group extraction. Further, the node group extraction processing unit 5 sets the node N where the stress value ⁇ switches below the lower limit value ⁇ 1 as the boundary of the node group. Thereby, in the node group in which the stress value ⁇ decreases from the center part where the stress value ⁇ is high toward the outside, it is possible to easily set the boundary forming the outer edge of the node group.
  • the non-evaluation data exclusion processing unit 6 excludes the node N to which at least one of the load condition, the constraint condition, the welding condition, and the component internal condition is assigned. Thereby, it is possible to reduce a calculation load when extracting a node group by excluding a portion where a stress value changes due to a special condition in advance.
  • the upper limit stress value converter 7 included in the node group extraction processor 5 excludes nodes N whose stress value ⁇ exceeds a predetermined upper limit value ⁇ 2 from marking targets. Perform processing. Thereby, it is possible to exclude the excessive stress value ⁇ considered to be caused by the singular point, and to keep the maximum stress value displayed on the screen in an appropriate range.
  • a maximum stress value can be easily derived for each node group by extracting a plurality of node groups from all the nodes N for which the stress values ⁇ have been calculated.
  • the maximum stress value for each node group can be reduced without clicking on a portion that is visually recognized as having a high stress value ⁇ . Can be automatically displayed, and it is possible to quickly perform a comparative study using numbers and optimize a component shape.
  • the result data 10 for which the processing by the node group extraction processing unit 5 has been completed is stored in the result storage system 8.
  • the result storage system 8 automatically creates images of the same scale and the same angle based on the result data 10. Further, the result storage system 8 reports that the result data 10 is stored to the terminal 9 of the person in charge of the design by e-mail, and each person in charge of the design can access the result data 10 from the terminal 9.
  • new result data 10 is additionally stored in the result storage system 8, and an image of the same scale and the same angle is automatically created.
  • the designer can efficiently compare and examine the images before and after the shape change at the same scale and the same angle.
  • FIG. 2 is a conceptual graph showing the relationship between each node N and the stress value ⁇ .
  • FIG. 3 is a conceptual diagram showing a method of excluding non-evaluation data.
  • FIG. 4 is a conceptual diagram showing a method of extracting a plurality of node groups from the analysis data.
  • the horizontal axis indicates the node number
  • the vertical axis indicates the stress value ⁇ .
  • the node numbers are set for all nodes N constituting the mesh M of the component data 2.
  • the graph in FIG. 2 corresponds to the entire part data 2 on which the stress analysis by the stress analysis unit 4 has been performed.
  • the stress analysis device 1 according to the present invention is characterized in that nodes N which are not necessary when studying the optimization of the component shape are excluded from the component data 2 as non-evaluation data, and a plurality of node groups are extracted. There is.
  • the non-evaluation data exclusion processing unit 6 sets a lower limit value ⁇ 1 and an upper limit value ⁇ 2 for the stress value ⁇ in order to narrow the evaluation range of the stress value ⁇ .
  • non-evaluation data exclusion processing section 6 excludes nodes N in area A1 where stress value ⁇ is less than lower limit ⁇ 1 as non-evaluation data.
  • the node N in the area A2 to which at least one of the load condition, the constraint condition, the welding condition, and the component internal condition is given is excluded as non-evaluation data. This makes it possible to reduce a calculation load when extracting a node group by previously excluding a portion where a stress value changes due to a special condition.
  • the node N in the area A3 where the stress value ⁇ is equal to or more than the upper limit value ⁇ 2 is excluded from the marking target and the processing is performed.
  • the processing is performed.
  • the node groups G1, G2, and G3 can be extracted from the component data 2.
  • the maximum stress value P1 of the node group G1, the maximum stress value P2 of the node group G2, and the maximum stress value P3 of the node group G3 can be easily derived.
  • the nodes N where the stress value ⁇ switches to less than the lower limit value ⁇ 1 are derived as the boundaries B of the node groups G1, G2, G3.
  • the boundary B forming the outer edge of the node group can be easily set.
  • FIG. 5 is a conceptual diagram showing a procedure for extracting a certain node group G4.
  • FIG. 6 is a conceptual diagram of the extracted node group G4.
  • the seed point S is a starting point of the comparison process between the stress value ⁇ of the node N and the lower limit value ⁇ 1.
  • the seed point S is randomly selected from the nodes N in the evaluation range and is also selected by narrowing down to the node N having the higher stress value ⁇ . can do.
  • the node N having the maximum stress value of the node group G4 is set as the seed point S.
  • the node group extraction processing unit 5 verifies the nodes N adjacent to the seed point S according to the node numbers set for the respective nodes N. Specifically, the stress value ⁇ of the node N is compared with the lower limit value ⁇ 1, and if the stress value ⁇ is equal to or larger than the lower limit value ⁇ 1, the common node group is set. One node group is formed by executing the comparison processing one after another along the node numbers, and a plurality of node groups are extracted by executing the same processing on the entire component data 2. At this time, as shown in the conceptual diagram of FIG. 4, the node N at which the stress value ⁇ switches below the lower limit ⁇ 1 is set as the boundary B of the node group G4.
  • FIG. 7 is a flowchart illustrating a procedure of a stress analysis process performed by the stress analysis device 1.
  • the stress analysis unit 4 performs a stress analysis operation on the mesh-divided component data 2.
  • step S2 operation data on which the stress analysis operation has been completed is obtained.
  • This operation data includes information on all nodes N that constitute the mesh M, and each node information includes a stress value ⁇ , a node number, and a node number of an adjacent node.
  • step S3 non-evaluation data is excluded from the calculation data.
  • the node N at which the stress value ⁇ is less than the lower limit value ⁇ 1 and the node N to which at least one of the load condition, the constraint condition, the welding condition, and the component internal condition is given as non-evaluation data. exclude.
  • the upper limit stress value converter 7 performs exclusion from marking targets. More specifically, when the stress value ⁇ of the node N is equal to or larger than the predetermined upper limit value ⁇ 2, the process is performed by excluding from the target of marking, so that the nodes can be included in the same node group.
  • steps S5 to S8 a comparison process of comparing the stress value ⁇ of the node N with the lower limit ⁇ 1 is performed to form a node group.
  • step S5 one node N in the evaluation data is selected as a seed point S.
  • step S6 it is determined whether or not the stress value ⁇ is equal to or larger than the lower limit value ⁇ 1 with respect to the node adjacent to the seed point S.
  • step S7 it is determined whether or not the stress value ⁇ is equal to or larger than the lower limit value ⁇ 1 with respect to the node N adjacent to the node N for which the determination in step S6 is completed.
  • step S8 it is determined whether there is an undetermined node. If a negative determination is made in step S8, that is, if it is determined that there is no undetermined node in one node group, the process proceeds to step S9, where the boundary B is set based on the boundary node at which the stress value ⁇ switches below the lower limit ⁇ 1. And one node group is created. On the other hand, if an affirmative determination is made in step S8, that is, if it is determined that there is an undetermined node, the process returns to step S7.
  • step S10 it is determined whether or not the determination of the entire evaluation data has been completed. If the determination is affirmative, the series of controls is terminated. On the other hand, if a negative determination is made in step S10, it is determined that there is another node group for which the determination has not been completed, and the process returns to step S5.
  • FIG. 8 is a stress contour diagram created based on the data 10 obtained by performing the stress analysis by the stress analysis device 1.
  • the stress contour diagram is given to each mesh M in a color corresponding to the stress value (for example, the color is changed in the order of red ⁇ orange ⁇ yellow ⁇ yellow green ⁇ green ⁇ blue ⁇ dark blue from the higher stress value). 8, the higher stress value ⁇ is indicated by shading as black.
  • the maximum stress value for each node group is derived, so that the stress contour diagram of each of the node groups G1, G2, and G3 is obtained.
  • the respective maximum stress values P1 (354 Mp), P2 (430 Mp), and P3 (331 Mp) can be easily displayed. As a result, when examining the optimization of the part shape while looking at the stress contour diagram displayed on the computer screen, the maximum stress Can be automatically displayed, and comparison with numerical values can be quickly performed.
  • FIG. 9 is a display example of a stress contour diagram when studying optimization of a component shape.
  • the designer can access the result data 10 from the terminal 9 and display various information on the display 11 of the terminal 9.
  • the result data 10 includes a lot of information such as CAD data, creation date and time, and creator in addition to the stress contour diagram.
  • the result data 10 when the result data 10 is created, it is notified to each terminal 9 (see FIG. 1) by e-mail, and the host computer saves the result data 10 by authenticating the designer within a predetermined period. It is set as follows. Also, when a part shape is changed by a designer and new result data 10 is created, the result data 10 is stored in the same procedure, and can be set to be automatically discarded if authentication is not performed within a predetermined period. . As a result, only the result data 10 authenticated by a plurality of designers can be stored, and unnecessary data can be prevented from increasing.
  • a stress contour diagram of the same scale and the same angle is automatically created as a representative image.
  • the stress contour diagrams of the same scale and the same angle it is easy to display them side by side on the same screen to grasp the difference between the changed portions, and it is possible to efficiently study the shape optimization.
  • not only the change in the color of the stress contour diagram but also the change in the maximum stress value for each node group can be compared at a glance, so that a further beneficial examination is possible.
  • the system configuration of the stress analyzer, the configuration of the mesh (element) created by the finite element method, the method of assigning node numbers, the upper limit value and lower limit value of the stress value, the method of setting the seed point, and the like are described in the above embodiment.
  • the present invention is not limited thereto, and various changes are possible.

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Abstract

L'invention concerne un dispositif d'analyse de contrainte qui permet une investigation d'un modèle d'analyse suite à une analyse de contrainte à effectuer avec moins d'étapes de travail. Un dispositif d'analyse de contrainte (1) comprend une unité de calcul de conversion de maillage (3) pour diviser un modèle d'analyse (2) en une pluralité de maillages (M), et une unité d'analyse de contrainte (4) pour calculer une valeur de contrainte (sigma) agissant sur des nœuds (N) constituant un maillage (M), ladite unité de calcul de conversion de maillage (3) définissant un numéro de nœud pour tous les nœuds (N) constituant la pluralité de maillages (M). Une unité de traitement d'extraction de groupe de nœuds (5) extrait une pluralité de groupes de nœuds (G1, G2, G3) en comparant une valeur limite inférieure prédéterminée (sigma 1) et la valeur de contrainte (sigma) agissant sur un nœud (N), en séquence, pour des nœuds adjacents au nœud sélectionné, et en définissant dans un groupe commun un intervalle dans lequel les nœuds (N) ont en continu une valeur de limite inférieure (sigma 1) supérieure ou égale à la valeur de contrainte (sigma).
PCT/JP2018/038380 2018-07-04 2018-10-15 Dispositif d'analyse de contrainte WO2020008660A1 (fr)

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CN111985059A (zh) * 2020-08-04 2020-11-24 华中科技大学 一种基于增材制造与热等静压的零件成形方法及系统
CN115577437A (zh) * 2022-11-21 2023-01-06 广东卓智设计工程有限公司 一种基于bim技术的装配式建筑的施工方法及系统

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CN111046610B (zh) * 2019-12-26 2023-05-23 中国航空工业集团公司西安飞机设计研究所 一种飞机整体翼梁无量纲应力强度因子的计算方法
JP7214669B2 (ja) * 2020-01-23 2023-01-30 株式会社三共 遊技機
JP7214668B2 (ja) * 2020-01-23 2023-01-30 株式会社三共 遊技機

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WO2016121638A1 (fr) * 2015-01-26 2016-08-04 新日鐵住金株式会社 Procédé d'estimation de régions productrices de défauts de forme de surface, procédé d'estimation de régions sources de défauts de forme de surface, dispositif d'estimation de régions productrices de défauts de forme de surface, dispositif d'estimation de régions sources de défauts de forme de surface, programme et support d'enregistrement

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CN111985059A (zh) * 2020-08-04 2020-11-24 华中科技大学 一种基于增材制造与热等静压的零件成形方法及系统
CN115577437A (zh) * 2022-11-21 2023-01-06 广东卓智设计工程有限公司 一种基于bim技术的装配式建筑的施工方法及系统
CN115577437B (zh) * 2022-11-21 2023-02-28 广东卓智设计工程有限公司 一种基于bim技术的装配式建筑的施工方法及系统

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