JP2005100038A - Analytic model preparation supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high quality analytic result by modeling a shape model to be analyzed by presenting an analytic modeling method proper for a system user by using a reference shape model to be analyzed and a reference analytic model on the basis of an analytic event where analytic modeling has been already executed. <P>SOLUTION: This device is provided with: an input means for inputting a shape model to be analyzed; an input designating means for designating and inputting the analytic event of a reference shape model and a reference analytic model to be referred to in modeling the shape model; a modeling extracting means for extracting a modeling rule used in executing analysis from the designated and inputted analytic event; a modeling presenting means for presenting the modeling rule extracted by the modeling extracting means; and a modeling executing means for selecting the presented modeling rule, and for executing the analytic modeling of the shape model to be analyzed on the basis of the selected modeling rule. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a technology related to CAE (Computer Aided Engineering) that optimizes and rationalizes design work by numerical analysis simulation using a computer.

  For the purpose of shortening the execution time of the numerical analysis simulation, the modeling of the shape model is to delete the shape features (for example, holes or fillets) of the shape model to be analyzed, and to replace the joint between the shape models with an approximate model. That is. The shape feature is a partial shape that can be interpreted in a specific meaning, such as a hole or a fillet (a curved surface formed at a corner), which is a modeling target in the shape model.

  Conventionally, it is known that modeling work is manually performed by a person skilled in numerical analysis simulation and takes time and effort. Accordingly, reduction of labor and time for creating an analysis model is widely demanded, and the following is proposed as a conventional technique.

  According to the first conventional technique, a threshold parameter is set for each keyword of the name of the shape feature with respect to the name keyword of the shape feature belonging to the shape model and attribute values such as the dimension value, area, and volume of the shape feature. When the threshold value parameter falls below the attribute value of the shape feature, modeling is performed to remove the shape feature (see, for example, Patent Document 1).

The second conventional technique is to execute an analysis modeling process and create an analysis model when a user designates a type of modeling and a shape feature part to be modeled (for example, see Patent Document 2). reference).
JP 2000-331194 (first page, FIG. 1) JP-A-6-259505 (first page, FIG. 1)

  The conventional analysis model creation apparatus has the following problems. That is, in the first prior art, a threshold parameter is set for each keyword of the name of the shape feature, and when the attribute value of the shape feature falls below the threshold parameter, the system user removes the shape feature. An unintended analysis model may be created. Further, Patent Document 1 describes that an arbitrary shape feature can be excluded from the removal target in advance. However, the system user determines whether or not the feature is to be removed before the execution of the modeling process. There is a problem that it is difficult.

In the second prior art, it is necessary for the system user to input the type of modeling to be performed in advance and the shape element to be the target. For system users unfamiliar with analytical modeling, it is difficult to determine which modeling method can be applied to which shape feature, and input the type of modeling and the target shape element Therefore, there is a problem that the work takes time.
An object of the present invention is to compare a reference shape model to be analyzed with a reference analysis model, or to compare a reference shape model with a reference analysis model and an analysis result of a reference analysis, based on an analysis example that has already been analyzed. By presenting an appropriate analysis modeling method to the system user, the analysis model can be obtained by applying the selected analysis modeling method to the analysis target shape model to obtain a high-quality analysis result. The object is to provide a model creation support device.

In order to solve the above problems, the present invention mainly adopts the following configuration.
Input means for inputting a shape model to be analyzed, designation input means for designating and inputting a reference analysis model including a reference shape model and an analysis mesh to be referred to when modeling the shape model, and the reference shape A comparison means for comparing the shape of the model with the reference analysis model, a creation means for creating an analysis modeling rule performed at the time of generating the reference analysis model, and a shape model to be analyzed based on the created analysis modeling rule. And means for modeling.

Further, in the analysis model creation support device, the designation input means designates and inputs an analysis result of a physical quantity variation in analysis result modeling for the reference shape model in addition to the reference shape model and the reference analysis model,
The creation means is configured to create an analysis modeling rule based on a change in a physical quantity of the analysis result input as specified.

  Also, an input means for inputting a shape model to be analyzed, a designation input means for designating and inputting a reference shape model to be referred to when modeling the shape model and an analysis example of the reference analysis model, and the designation Modeling extraction means for extracting modeling rules applied when performing analysis from the input analysis case, modeling presentation means for presenting the modeling rules extracted by the modeling extraction means, and the presented A modeling execution unit that selects the modeling rule and executes analysis modeling of the shape model to be analyzed based on the selected modeling rule.

Further, in the analysis model creation support device, the designation input means designates and inputs an analysis result of physical quantity variation in analysis result modeling for the reference shape model in addition to the analysis example,
The modeling extraction unit is configured to create an analysis modeling rule based on a change in a physical quantity of the analysis result input as specified.

  According to the present invention, even an operator who is unfamiliar with the creation of an analysis model can effectively use past similar model modeling, and can perform modeling similar to the past similar model in a short time.

  In addition, since a shape feature that can be deleted is selected based on the analysis result of the reference analysis model, iterative calculation such as parameter survey and optimization calculation can be performed efficiently in a short time.

  An analysis model creation support apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings. First, the overall configuration of an analysis model creation support apparatus according to an embodiment of the present invention will be described. FIG. 1 is a block diagram showing the overall configuration of an analysis model creation support apparatus according to an embodiment of the present invention.

  The analysis model creation support device according to the present embodiment analyzes the input / output device 1 and a command input by the system user using the input / output device 1, and each component of the analysis model creation support device of the present embodiment is analyzed. A command analysis unit 2 for instructing processing execution, a shape model input unit 3, an analysis case designation unit 4 for designating an analysis case to be referred to when a system user models the shape model, and the designation A modeling extraction unit 5 that extracts a modeling rule applied when an analysis is performed from the analyzed analysis case, and a modeling presentation unit 6 that presents the modeling rule extracted by the modeling extraction unit 5 to a system user; And a modeling execution unit 7 that prompts the system user to select a modeling rule to be executed and executes analysis modeling based on the selected modeling rule. Further, the modeling model 8 that can register the modeling rule extracted by the modeling extraction unit in association with the identifier that specifies the analysis example specified by the system user may be added to the analysis model creation support device. .

  Hereinafter, modeling of the shape model shown in FIG. 2 (definition will be described later, but, for example, the hole 203 and the fillet 204 shown in FIG. 2 are deleted to create an analysis model) is taken as an example. The operation of each processing unit will be described. The model shown is composed of two parts, a crankshaft 201 and a connecting rod 202.

  Next, functions or actions of each component of the analysis model creation support apparatus according to the present embodiment will be sequentially described.

"Shape model input part"
The shape model input unit 3 is for creating and changing a shape model in accordance with a shape model creation request and a change request input by the system user using the keyboard 1b and mouse 1c of the input / output device 1.

  A boundary representation is used as the representation of the shape model data. In the boundary representation, a solid is represented by a boundary surface that separates the outside and the inside, and there are phase (topology) data representing the connection of the boundary surfaces and shape data representing the shape of the boundary surface as shape model data. In boundary representation, a solid possesses a set of one or more consecutive boundary surfaces belonging to it, a surface possesses one or more line segments belonging to it, and a line segment possesses its start and end points Take the structure. A point has a three-dimensional coordinate value as its geometric data. There are various types of methods for expressing geometric data for lines and surfaces, and any of them may be used. Here, a NURBS function widely used for expressing geometric data in three-dimensional CAD or the like is used. Details of the boundary representation are described in, for example, “Basics and Applications of 3D CAD” (Hiroshi Toriya, Hiroaki Chiyokura: Kyoritsu Publishing Co., Ltd .: 1991).

  A shape model is also defined as a set of shapes called shape features. The shape feature is a partial shape that can be interpreted in a specific meaning, such as a hole, a fillet (a curved surface formed at a corner), or a chamfer (a flat surface). A shape feature is defined by its type and shape feature parameters. Examples of shape feature types and their parameters are shown in FIG. For example, in the case of a hole shape, numerical values such as a hole diameter and a hole depth are defined as parameters. Also, the shape feature can be registered with a name such as an oil drain hole. For a particular shape feature, the faces, lines and points that make up the shape model are uniquely determined. In the shape model of FIG. 2, a hole shape 203, a fillet shape 204, and the like are defined as shape features as shown in FIG. 4 (the shape feature shown in FIG. 4 is a model of the real thing shown in FIG. First, the actual shape, that is, the shape model is set prior to the execution of (1).

  Further, the shape model in FIG. 2 is defined as an assembly (assembly) of the crank 201 and the connecting rod 202. Assemble information includes, for example, assembling conditions between parts to be assembled and their positions as shown in FIG. 5 (when the assembly is an exploded view, the point A designated by the crank and the point B designated by the connecting rod are Are registered in association with each other.

  Modeling here means that the shape features (for example, holes and fillets) belonging to the shape model to be analyzed are deleted and simplified at the time of analysis calculation, an analysis mesh corresponding to the connection between assembly parts is created, For example, a dividing line is added to the shape model for generation of an analysis mesh or a line of the shape model is deleted. In addition, this invention makes the invention the improvement and the device in the process until performing the modeling mentioned above.

`` Analysis case designation part ''
FIG. 6 shows an example of the screen display of the analysis case designation unit 4. The analysis case designation unit 4 prompts the system user to select an analysis case that serves as a model for a modeling technique applied to the shape model to be analyzed. As a method of selecting an analysis example, a shape model and an analysis model already created for this and / or an analysis result obtained by performing an analysis calculation are specified, and modeling is extracted from the specified model (analysis model) Designation method), a method of performing analysis calculation on the shape model to be analyzed and extracting modeling based on the result (analysis calculation execution method), and registering in association with analysis cases registered in the modeling database 8 There are three methods: a method of referring to the modeled (analysis case designation method).

  The analysis case designation unit 4 includes a system user's analysis model designation button 61, an analysis calculation execution button 62, and an analysis case designation button 63. Interactive analysis model designation or analysis conditions are interactively set according to the system user's button designation. Prompts the user to specify the input (for execution of analysis calculation) or analysis case.

  FIG. 7 is an input screen displayed by the analysis case designation unit 4 when the analysis model designation button 61 is selected. Reference shape model names (for example, crankshaft connecting rods) used for analysis model extraction by the analysis model designation method are shown. System input) and reference analysis model name (name of the model that generated the analysis mesh) and reference analysis result name (for example, an analysis result of physical quantity such as stress distribution and deformation) Encourage people.

  Here, the reference shape model is a shape model already created by the shape model input unit, and includes information on shape features and assemblies. The reference analysis model is an analysis mesh model for numerical analysis calculation, and is a model composed of element data and node data as shown in FIG. 8 (in the analysis mesh model shown in FIG. 12, for example, 6 The unit of the face mask is the element, and the intersection between the elements is the node (122)). For node data, the number of nodes, the node number unique to each node and its coordinate value, and for element data, the number of elements, the element number unique to each element, and the number of nodes constituting the element The node number and the identifier of the part to which the element belongs are registered. The reference analysis result is data in which an element or node of an analysis model is associated with a physical quantity obtained as a result of analysis calculation.

  In the screen shown in FIG. 7, when only the reference shape model and the reference analysis model are input, the modeling method is extracted from the reference shape model and the reference analysis model, and when the reference analysis result is also input, the reference is performed. A modeling method is extracted from the shape model, the reference analysis model, and the reference analysis result.

  In addition, when the system user selects the analysis calculation execution button 62, the analysis example designating unit 4 sets analysis conditions (for example, material conditions, load conditions, constraint conditions) necessary for performing the analysis calculation of the target model, A screen with buttons for generating an analysis mesh and executing analysis calculation is displayed to prompt the system user to execute analysis calculation. Further, the analysis example designating unit 4 executes analysis calculation based on the analysis conditions input by the system user. The analysis mesh generation method is described in, for example, Japanese Patent No. 2657301.

  Here, the modeling database 8 shown in FIG. 1 will be described. In the modeling database 8, the modeling rules extracted by the modeling extraction unit 5, as shown in FIG. 9A, for example, the name of the analysis model, the type of analysis calculation, the date and time of analysis calculation, the person in charge of analysis calculation, etc. It registers in association with the analysis information. Here, the name of the analysis model, the type of analysis calculation, the date and time of analysis calculation, and the person in charge of analysis calculation are given as examples of analysis information. However, any information can be used as long as it is an identifier for identifying the analysis calculation. You may register. In the modeling method column of the modeling database 8, as shown in FIG. 9B, an identifier (in this case, ON :) indicating whether or not modeling has been performed for all shape features existing in the analysis model. Associated (excludes holes in the example of FIG. 9B), OFF: None), and identifiers (0: undecided, 1: adhesive coupling, here) indicating the coupling state between assembled parts : Welding connection, 3: contact connection) in association with each other.

  In addition, a characteristic line of the analysis mesh belonging to the reference analysis model (the characteristic line will be described later in the description of FIG. 20C. For example, in order to divide a triangular shape model into a quadrilateral mesh by a two-dimensional model, First, when a Y-shaped auxiliary line is put into a triangle of the shape model and a quadrilateral mesh is generated in a quadrilateral divided into Y-shaped shapes after that, this Y-shaped auxiliary line is called a feature line). As in (c), the coordinate values and the number of points constituting the line are registered for each feature line. That is, when the modeling of the shape feature is ON, the shape surface constituting the shape feature is deleted from the model. Further, different models are used depending on identifiers between assembled parts.

  FIG. 14 is a diagram for explaining modeling by adhesion, welding, and contact. In FIG. 14A, the part 1402 is arranged on the surface of the part 1401. FIG. 14B is a diagram in which the parts 1401 and 1402 are divided and displayed in a wire frame for easy understanding. The solids 1401 and 1402 are in contact with each other at the surfaces 1403 and 1404, and are selected as shape elements constituting the shape features according to the shape element selection rules of the surfaces 1403 and 1404.

First, the surface of the part is divided so that the joining portions of the parts 1401 and 1402 coincide with each other. Here, since the surface 1404 of the component 1402 corresponds to this, the surface 1403 divides the surface 1403 of the component 1401 into a surface 1405 and a surface 1406.
In the case of adhesion modeling, the surface 1404 and the surface 1405 are connected so that the connecting part of the two parts has the same behavior. Therefore, the joint points of the two parts are completely shared.

  In the case of welding modeling, the boundary line segments of the coupling surfaces 1404 and 1405 are coupled so that the boundary portion of the coupling surface has the same behavior. Therefore, the joint part boundary node is completely shared between the two parts.

  In the case of contact modeling, since the behaviors of the two parts do not match, it is not necessary to divide the surface of the coupling part with respect to the coupling parts 1403 and 1404 of the two parts. However, a contact element will be produced | generated on the surface of the connection part between components.

  When selecting an analysis case registered in the modeling database 8 as a method of selecting an analysis case in the analysis case specification unit 4, all the analysis information is specified on the screen as shown in FIG. Display only information in a list format, let the system user select using the input / output device, or prompt the system user to enter a keyword, search based on this, and list the corresponding analysis examples on the screen A method of displaying the data in a table format and selecting it to a system user using an input / output device may be used. At this time, the system user may select one or more analysis cases.

  The system user selects the end button 64 after completing the specification of the model or analysis example serving as a model, and ends the analysis case specifying process. Here, it is assumed that the reference shape model 161 and the reference analysis model 162 shown in FIG. 16 are selected (in the example of FIG. 16, the hole is deleted and the fillet is not deleted).

"Modeling extractor"
The modeling extraction unit 5 extracts modeling rules from the reference shape model, the reference analysis model, and the reference analysis result (analysis result shown in FIG. 15) input by the system user, and registers them in the modeling database 8. The modeling extraction unit 5 compares the reference shape model with the reference analysis model, and the shape feature deleted in the modeling, the connection state between parts in the assembly, the feature line of the reference analysis model, and the physical quantity change of the reference analysis result Extractable shape features from. The reference analysis result will be described later in the description of FIG. 15. For example, as a result of analyzing the reference analysis model by taking stress as a physical quantity, the stress fluctuation is larger than a predetermined value between the nodes of the analysis mesh where the hole exists. If the size is small, the hole can be deleted, but if the size is large, the hole cannot be deleted.

  First, a flowchart of the shape feature modeling rule creation process is shown in FIG. This flowchart is a flow for creating the upper data in (b) of FIG. Hereinafter, the processing will be described according to the flowchart. In ST111, the element surface existing at the shape surface position is acquired from the mesh belonging to the reference analysis model. The element surface existing at the shape surface position belongs to only one element when considered as an element belonging to the same part. By performing this check on all element surfaces, the element surfaces belonging to the shape surface can be easily obtained. In ST112, all nodes existing on the shape surface are acquired. The nodes existing on the shape surface can be easily obtained because they are nodes constituting the element surface belonging to the shape surface obtained in ST111.

  In ST113, a shape feature for checking whether or not modeling is performed is acquired. In ST114, the shape surface of the reference shape model registered in association with the shape feature obtained in ST113 is obtained. In ST115, the minimum distance dd between all the nodes existing on the shape surface in ST113 and the shape surface of the reference shape model obtained in ST114 is obtained.

  In ST116, when the distance dd obtained in ST115 is equal to or smaller than a sufficiently small threshold value, a node is generated on the surface of the reference shape model, so the identifier is not modeled: OFF. FIG. 12B shows a reference analysis model created without modeling the fillet surface. For example, a node 122 is generated on the surface 121 whose shape feature of the reference shape model of FIG. 12A is a fillet. ing. Therefore, it can be determined that the identifier is not modeled: OFF.

  In ST117, if the distance dd obtained in ST115 is equal to or greater than the threshold value, it is determined that the shape feature has been deleted by modeling, and the identifier is set to modeling execution: ON. FIG. 12C shows a reference analysis model created after the fillet surface is modeled. No nodes are generated on the surface where the shape feature of the reference shape model of FIG. 12A is a fillet. Therefore, it can be determined that the identifier is modeling implementation: ON.

  In ST118, a modeling identifier is associated with the shape feature and registered in the modeling database 8. In ST119, it is confirmed whether or not the modeling has been checked for all the shape features. When all the checks have been completed, the check process ends. If there is an unchecked shape feature, the process returns to ST113 and is repeatedly checked. Here, the modeling of the shape feature for the three-dimensional shape model has been described, but in the case of the two-dimensional shape, the element surface on the shape surface in the flowchart is associated with the element line on the boundary line and the feature shape. If the registered shape line is used, it is possible to determine whether or not modeling is performed in the same manner.

  Subsequently, the modeling extraction unit 5 creates a modeling rule for the coupling unit in assembly. Modeling methods in assembly include adhesive bonding, weld bonding, and contact bonding. FIG. 13 shows a flowchart for creating a modeling rule in the combining unit. This flowchart is a flow for creating data in the lower part of FIG. 9B. Hereinafter, the processing will be described according to the flowchart.

  In ST131, assembly information for checking whether or not modeling is performed is acquired. In ST132, a connection region between components (a surface when the reference shape model is three-dimensional, a line when the reference shape model is two-dimensional) in each assembly information of the reference shape model is searched. The combined region is a union FC of the shape surface group FA belonging to the part A to be assembled and the shape surface group FB belonging to the part B.

  In ST133, all element surfaces EA belonging to the area FC from the element surface of the analysis mesh constituting the part A and all element surfaces EB belonging to the area FC from the element surface of the analysis mesh constituting the part B are acquired. In ST134, low-order elements (two-dimensional elements: shell elements when the reference shape model is three-dimensional: shell elements, and one-dimensional elements: beam elements when the reference shape model is two-dimensional) are generated in the coupling region FC. In this case, it is determined that contact modeling is performed, and the connection identifier is contact modeling.

  In ST135, when the node group belonging to the element surface group EA and the node group belonging to the element surface group EB completely match (for example, in the case of two dimensions, all the nodes in the coupling region match), an adhesion model is created. Is determined to be performed, and the bond identifier becomes adhesion modeling. In ST136, when the node group belonging to the element surface group EA and a part of the node group belonging to the element surface group EB match (for example, in the case of two dimensions, only the nodes at the outer edge portion in the coupling region match). ), It is determined that welding modeling is performed, and the connection identifier is welding modeling.

  In ST137, when it does not correspond to ST134, ST135, ST136, the coupling state in the analysis modeling between the two parts is undetermined, and the coupling identifier is undetermined. In ST138, the association identifier is associated with the assembly information and registered in the modeling database 8. In ST139, it is confirmed whether or not modeling has been checked for all assembly information. When all the checks have been completed, the check process ends. If there is unchecked assembly information, the process returns to ST131 and is repeatedly checked.

  Next, a feature line extraction method of the reference analysis model will be described with reference to FIG. FIG. 20A shows a reference shape model, and FIG. 20B shows a reference analysis model created for the reference shape model. In FIG. 20B, the mesh pattern on the upper surface is a mesh that continues to the lower surface. The feature line is a line segment (auxiliary lines indicated by 201, 208, and 209 in the example of FIG. 20C) added to the reference shape model for generating the analysis mesh. In ST211, all element sides belonging to three or five or more elements of the analysis mesh element lines are obtained. Here, a line segment indicated by 201 is extracted as a feature line. In ST212, all element sides connected to the nodes belonging to the end points of each feature line obtained in ST211 are obtained. The end points of the feature line 201 are 202 and 203, and the element sides 204, 205, and 206 correspond to this.

  In ST213, until the other end of the element line hits the other end point, or at least one element in the element group to which the element side belongs becomes equal to the element in the element group to which the element side immediately before belongs. Until, the straight element side is traced as a feature line. For the element side 204, the element side 207 is searched, and the feature line 208 is extracted. At the same time, a feature line group 209 is extracted. In ST214, for the end points belonging to only one feature line among the end points of the feature line extracted in ST213, all element sides belonging to the end point are searched, and in the element side direction that does not share the feature line and the element plane The element side is searched until it reaches the end point of the feature line and extracted as a feature line. For the end point 2010 of the feature line 208, a feature line 2012 including the element side group 2011 is extracted. At the same time, a feature line group 2013 is extracted. In ST225, the feature lines extracted in ST211 to ST214 are registered in the modeling database 8. The coordinate values of the points constituting the feature line can be easily retrieved from the nodes of the mesh. FIG. 20C shows the characteristic line finally extracted.

  Finally, modeling rule creation based on analysis results will be described. The modeling extraction unit 5 creates a modeling rule from the reference shape model, the reference analysis model, and the reference analysis result input by the system user, and registers them in the modeling database 8. Here, the modeling extracted by the modeling extraction unit 5 is the deletion of the shape feature, and the modeling is to delete the shape feature that corresponds to the part where the physical quantity variation is small in the analysis result.

  An example of an input screen for parameters that can be set when performing this modeled extraction is shown in FIG. On the input screen, for example, a physical quantity 151 to be noted, a physical quantity distribution range 152 of a shape feature that can be deleted, and a physical quantity variation threshold value 153 that can be deleted can be input. Further, the physical quantity variation in each shape feature is defined as the difference between the maximum value and the minimum value of the physical quantity of the node group existing at the shape feature position in the reference shape model. If the variation of the physical quantity obtained in this way is within the physical quantity variation threshold value 153, the identifier of this shape feature is registered in the modeling database 8 as a deletion.

  Here, the model extraction based on the reference shape model, the reference analysis model, and the reference analysis result has been described. However, when the system user selects the analysis calculation execution button in the analysis example designating unit 4, the shape to be modeled Using the shape model input by the model input unit 1, the analysis mesh generated by the analysis case specifying unit 4, and the analysis result performed by the analysis case specifying unit 4, the deletion of the shape feature may be determined in the same manner. it can.

  16 is extracted from the reference shape model and the reference analysis model shown in FIG. 16 (only the shape feature and assembly modeling rules are shown) and registered in the model database 8. .

"Modeling presentation section"
The modeling presentation unit 6 displays the modeling rules created by the modeling extraction unit 5 on the reference shape model. For example, as shown in FIG. 17, the shape feature (hole as an example) whose identifier is ON in the modeling database is modeled as a highlight 171 such as changing the color or “contact” 172 at the position of the assembly coupling portion. Displays the identifier. Further, the feature line and the deletion line of the reference analysis mesh are highlighted on the reference shape model as indicated by 173.

"Modeling execution part"
The modeling execution unit 7 collates the shape feature name belonging to the shape model with the shape feature name of the modeling rule, and presents the matching shape feature name and the modeling method to the system user. The modeling rule to be collated here is a modeling rule associated with the modeling rule extracted by the modeling extraction unit 5 and the analysis case specified by the analysis case specifying unit 4. At this time, for example, as shown in FIG. 18, the surface corresponding to the shape feature of the modeling target is changed in color, for example, 181, or the coupling method is displayed on the assembling connection surface of the modeling target, such as 182. If it is highlighted, the system user can easily specify the modeling target part. Here, the matching of the shape feature names is used as the presentation condition, but, for example, a shape feature name matching condition that matches only a part of the shape feature names may be used.

  Further, the modeling execution unit 7 may have a function of displaying the number of deleted / undeleted shape features with the dimension parameter as a horizontal axis according to the type of shape features. By referring to this, the system user designates the shape feature parameters on the screen display using the keyboard 1b and the mouse pointer 1c, so that the model feature model having a dimension parameter equal to or less than the designated parameter value is modeled. Can also be performed. Further, the system user can change the modeling technique to be applied by selecting the shape feature modeling change button 183 or the assemble modeling change button 184 as necessary.

  The modeling execution unit 7 executes modeling specified by the system user in response to the selection of the modeling execution button 185. In the case of the analysis target shape model of FIG. 2, the hole shape 203 is deleted due to the coincidence of the shape feature names, and an analysis model (FIG. 19) with contact conditions between the crank 201 and the connecting rod 202 is created.

  In the above description, the shape model to be analyzed is described as being modeled using the reference shape model and the reference analysis model stored in the database, but instead of the reference shape model. Then, an analysis model is generated by generating an analysis mesh by giving an analysis condition to the shape model to be analyzed, and an analysis calculation result that is a result of an analysis calculation of a physical quantity variation is obtained. The analysis model of the shape model to be analyzed and the analysis calculation result can be stored in a database for use.

It is a block diagram which shows the whole structure of the analysis model creation assistance apparatus which concerns on embodiment of this invention. It is a figure which shows a crankshaft and a connecting rod as an example of the model used as the object of analysis. It is a figure which shows an example of the kind of shape feature in a model of analysis object, and a parameter. It is a figure which shows an example of the shape feature information in the model of analysis object. It is a figure which shows an example of the assembly information in the model of analysis object. It is a figure which shows an example of a display of an analysis example designation | designated screen. It is an example of a model designation screen display. It is a figure which shows the data structure of a reference analysis model. It is a figure which shows the content of the data stored in a modeling database. It is a figure which shows the example of a screen display of a modeling database. It is a flowchart of shape feature modeling rule creation. It is a figure which shows the modeling implementation and non-implementation of the fillet in a reference shape model and a reference analysis model. It is a flowchart of the modeling rule preparation in a coupling | bond part. It is a figure which shows the example of modeling in a coupling | bond part. It is a figure which shows an example of the display of the modeling designation | designated screen based on the analysis result in a reference analysis model. It is a figure which shows the relationship between a reference shape model and a reference analysis model. It is a figure which shows the example of a screen display of a modeling presentation part. It is a figure which shows the example of a screen display of a modeling execution part. It is a figure of the created analysis model. It is a figure explaining the characteristic line extraction method of a reference analysis model.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input / output device 1a Display device 1b Keyboard 1c Mouse 2 Command analysis part 3 Shape model input part 4 Analysis example designation part 5 Modeling extraction part 6 Modeling presentation part 7 Modeling execution part 8 Modeling database 61 Analysis model designation button 62 Analysis calculation execution button 63 Analysis case designation button 121 Fillet surface 122 Node 201 Crankshaft 202 Connecting rod 204, 205, 206, 207 Element side 208, 209 Characteristic line

Claims (9)

Input means for inputting a shape model to be analyzed, designation input means for designating and inputting a reference analysis model including a reference shape model and an analysis mesh to be referred to when modeling the shape model, and the reference shape A comparison means for comparing the shape of the model with the reference analysis model, a creation means for creating an analysis modeling rule performed at the time of generating the reference analysis model, and a shape model to be analyzed based on the created analysis modeling rule. An analysis model creation support device comprising: modeling means for modeling. In the analysis model creation support device according to claim 1,
The designation input means designates and inputs a physical quantity fluctuation analysis result in analysis result modeling for the reference shape model in addition to the reference shape model and the reference analysis model,
The creation means creates an analysis modeling rule based on a change in a physical quantity of the analysis result that has been designated and input. An input means for inputting a shape model to be analyzed, a designation input means for designating and inputting a reference shape model to be referred to when modeling the shape model and an analysis example of the reference analysis model, and the designation input Modeling extraction means for extracting modeling rules applied when performing analysis from the analyzed analysis examples, modeling presentation means for presenting the modeling rules extracted by the modeling extraction means, and the presented model An analysis model creation support device comprising: a modeling execution unit that selects a modeling rule and executes an analytical modeling of the shape model to be analyzed based on the selected modeling rule. In the analysis model creation support device according to claim 3,
The designation input means designates and inputs an analysis result of physical quantity fluctuation in analysis result modeling for the reference shape model in addition to the analysis example,
The analysis model creation support apparatus, wherein the modeling extraction unit creates an analysis modeling rule based on a change in a physical quantity of the analysis result input as specified. In the analysis model creation support device according to any one of claims 1 to 4,
An analysis model creation support device, which creates deletion and non-deletion of a shape feature constituting the reference shape model as an analysis modeling rule. In the analysis model creation support device according to any one of claims 1 to 4,
An analytical model creation support device, which creates analytical modeling at a joint portion between parts constituting the reference shape model as an analytical modeling rule. In the analysis model creation support device according to any one of claims 1 to 4,
An analysis model creation support apparatus that creates a feature line of an analysis mesh of the reference analysis model as an analysis modeling rule. In the analysis model creation support device according to claim 1 or 2,
The analytical model creation support apparatus, wherein the created analytical modeling rule is highlighted on the reference shape model. In the analysis model creation support device according to claim 2,
In place of the reference shape model, creating an analysis model that generates an analysis mesh by giving an analysis condition to the shape model to be analyzed,
Obtaining an analytical calculation result that is a result of the analytical calculation of the physical quantity variation,
An analysis model creation support apparatus, wherein the analysis model of the analysis object shape model and the analysis calculation result are stored in a database.

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