Patent Publication Number: US-2018052948-A1

Title: Analysis mesh manufacturing equipment and method

Description:
TECHNICAL FIELD 
     The present invention relates to analysis mesh manufacturing equipment and an analysis mesh manufacturing method, which manufacture a mesh by using a CAE (Computer Aided Engineering) system that numerically simulates a physical phenomenon by numerical analysis using a calculator. 
     BACKGROUND ART 
     As means for phenomenon clarification and problem solution, numerical simulation by a finite element method is widely used. To perform the simulation by the finite element method (hereinafter, called analysis), an analysis model is required to be manufactured. With the sustainable improvement in computer processing ability and analyzing technique, the size increase and refinement of the analysis model have advanced, and are expected to advance more and more in the future. Since the quality of the mesh of the analysis model significantly influences analysis precision, it is important to determine the index of the mesh quality to manufacture the mesh therealong. From these situations, the load of the operation of manufacturing the analysis model increases, which becomes a problem in enhancing the efficiency of analysis exploitation. 
     The following conventional techniques for automatically manufacturing the mesh of the analysis model are known. The first technique is illustrated in Patent Literature 1, and is a system that automatically manufactures, with respect to an input figure, a square mesh in which the sides of the square elements are aligned along the possible limit boundary thereof. 
     The second technique is illustrated in Patent Literature 2, and inputs a shape targeted for manufacturing a mesh to generate a plurality of types of bubbles in the region of the shape. The bubbles are moved by the force between the bubbles defined according to a predetermined law, and the number of the bubbles is then adjusted so as to arrange the adjacent relationship between the bubbles, thereby determining the stable arrangement of the bubbles. Then, the centers of the bubbles of the specified type among the plurality of types of bubbles are connected to manufacture the mesh. 
     The third technique is illustrated in Patent Literature 3, and is a system in which CAD data and mesh data in partial shape are registered to a sample database and input CAD data in new design shape and the sample CAD data are compared. When the input CAD data in new design shape and the sample CAD data are in partial similar shape, the sample mesh data corresponding to the sample CAD data is diverted. In addition, a mesh is manufactured with respect to the portion that is not similar to the sample data by using the existing mesh manufacturing method, and is then combined with the diverted mesh, thereby manufacturing a mesh corresponding to the new design shape. 
     In addition, in the conventional technique illustrated in, for example, Patent Literature 4 by which the portion that does not satisfy the quality thereof is retrieved to improve the quality thereof by a predetermined method, collapse is avoided by correcting the node on the surface of a three-dimensional mesh including a collapsing element. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Unexamined Patent Application Publication No. Hei 8-138082 
     Patent Literature 2: Japanese Unexamined Patent Application Publication No. Hei 11-110586 
     Patent Literature 3: WO2015/092842 
     Patent Literature 4: Japanese Unexamined Patent Application Publication No. Hei 10-289257 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, the above conventional techniques have the following problems. 
     According to the conventional techniques described in Patent Literatures 1 and 2, although the mesh can be automatically manufactured, securing the quality (mesh specification), such as the shape, inner angle, and edge length of the mesh, is sometimes difficult. In the shape to be analyzed, the portion that significantly influences analysis precision and the portion that does not significantly influence analysis precision are present, so that the mesh to be manufactured is not uniform. Therefore, the mesh is manufactured by designating a parameter, such as mesh size and quality, to each portion. However, the number of processes increases. 
     In Patent Literature 3, although the existing mesh can be reused by portion, the partial shape thereof is required to have a characteristic shape. For example, in the case of a simple shape, such as a cylindrical surface and a torus surface, like a bead shape and a fillet shape, there are an infinite number of portions that are determined to be in partial similar shape. Consequently, this conventional technique is not practical. 
     In addition, in Patent Literature 4, although the mesh having poor quality can be corrected, the index of the mesh specification is required to be clearly defined. However, the element to be corrected is sometimes determined empirically and sensuously, so that in many cases, the index cannot be defined. For example, by element, even the element having good quality that is close to a regular polygon or a regular polyhedron is sometimes required to be corrected according to the connection pattern thereof. Consequently, it is difficult to quantify the index, with such the element as the element that is required to be corrected. 
     Although it is also considered that with respect to a collection of elements (partial mesh), the index of the portion to be corrected is defined by using the quality of each element and the connection pattern thereof, the index becomes very complicated. Consequently, a large number of processes are required for defining the index and for developing means for retrieving the portion to be corrected based on the index. 
     Also, this difficulty increases when it is considered that the mesh specification required is different for each portion, which is pointed as the problem of Patent Literatures 1 and 2. Further, the mesh specification is changed with the advancement of the analyzing technique and the improvement in the calculator ability. That is, the means for retrieving the portion to be corrected is required to be permanently improved, which is not preferable. 
     The present invention has been made in view of the above circumstances, and an object of the present invention is to provide analysis mesh manufacturing equipment and an analysis mesh manufacturing method, which are capable of manufacturing a mesh satisfying the specification thereof in consideration of the differing of the specification of the mesh to be manufactured for each portion to be analyzed, the difficulty in defining the mesh specification, and the response to the change in the mesh specification. 
     Solution to Problem 
     To solve the above problems, for example, the configurations described in the claims are adopted. 
     The present invention includes a plurality of means for solving the above problems, and provides, as an example, analysis mesh manufacturing equipment having first means for registering, as an uncorrected sample, a combination of partial mesh data for a correction examining portion and CAD data associated therewith to a mesh correcting sample database, second means for storing mesh data and CAD data that are to be inspected, third means for retrieving, with respect to the mesh data and the CAD data that are to be inspected, a partial mesh that is similar to the mesh data and the CAD data of the uncorrected sample that are registered to the mesh correcting sample database, and fourth means for highlighting the retrieved partial mesh on a display device. 
     Further, the present invention provides analysis mesh manufacturing equipment including a display device, wherein the analysis mesh manufacturing equipment compares mesh data of an inspection target model with partial mesh data for the correction examining portion of part of the inspection target model, and retrieves a partial mesh that is similar to the mesh data for the inspection target model, and wherein the partial mesh that is retrieved as being similar to the mesh data for the inspection target model is plotted and displayed on the display device. 
     Further, the present invention provides analysis mesh manufacturing equipment including a display device, wherein the analysis mesh manufacturing equipment has mesh data of an inspection target model, uncorrected partial mesh data for the correction examining portion of part of the inspection target model, and corrected partial mesh data for the correction examining portion of part of the inspection target model, compares the mesh data of the inspection target model with the uncorrected partial mesh data, retrieves an uncorrected partial mesh that is similar to the mesh data for the inspection target model, and replaces the mesh data of the portion that is determined to be similar of the mesh data of the inspection target model with the corrected partial mesh data, and wherein the partial mesh that is retrieved as being similar to the mesh data for the inspection target model, the uncorrected partial mesh, and the corrected partial mesh are plotted and displayed on the display device. 
     Still further, an analysis mesh manufacturing method of the present invention includes storing mesh data of an inspection target model and partial mesh data for a correction examining portion of part of the inspection target model, and comparing the mesh data of the inspection target model with the partial mesh data for the correction examining portion of part of the inspection target model to retrieve a partial mesh that is similar to the mesh data for the inspection target model. 
     Moreover, an analysis mesh manufacturing method of the present invention includes storing mesh data of an inspection target model, uncorrected partial mesh data for the correction examining portion of part of the inspection target model, and corrected partial mesh data for the correction examining portion of part of the inspection target model, and comparing the mesh data of the inspection target model with the uncorrected partial mesh data, retrieving an uncorrected partial mesh that is similar to the mesh data for the inspection target model, and replacing the mesh data of the portion that is determined to be similar of the mesh data of the inspection target model with the corrected partial mesh data. 
     Advantageous Effects of Invention 
     According to the present invention, the partial mesh can be registered as the sample, and from the similarity to the mesh, the partial mesh that is required to be corrected can be retrieved. Therefore, the mesh specification is not required to be quantified, thereby enhancing efficiency. 
     In addition, according to the embodiments of the present invention, even when the mesh specification is changed, the sample mesh is simply replaced. Therefore, the means for retrieving the portion to be corrected is not required to be permanently improved. Also, both of the similarity of the CAD data associated with the mesh and the similarity of the mesh data are evaluated. It is thus possible to respond to the differing of the specification of the mesh that is required to be manufactured for each portion. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating the configuration of mesh manufacturing equipment according to a first embodiment that presents the information of a correction examining portion to the user. 
         FIG. 2  is a diagram illustrating inspection target model data D 1  and mesh correcting sample data D 2 . 
         FIG. 3  is a diagram in which a corrected sample mesh D 3  is added to  FIG. 2 . 
         FIG. 4  is a diagram illustrating the configuration of mesh manufacturing equipment according to a second embodiment that performs actual correction in addition to presenting the information of a correction examining portion to the user. 
         FIG. 5  is a diagram illustrating the corrected state of the inspection target model data D 1  in  FIG. 3 . 
         FIG. 6  is a diagram illustrating another case of the inspection target model data D 1 , the mesh correcting sample data D 2 , and the corrected sample mesh D 3 . 
         FIG. 7  is a diagram illustrating the corrected state of the inspection target model data D 1  in  FIG. 6 . 
         FIG. 8  is a diagram illustrating an example of the operation screen of a display device  100 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an example of mesh manufacturing equipment of the present invention will be described with reference to the drawings. It is noted that as the use forms of the mesh manufacturing equipment of the present invention, there are a case of only presenting the information of a correction examining portion to the user to leave actual correction to the user and a case of performing correction in addition to presenting the information of a correction examining portion to the user. Therefore, hereinbelow, the former form is represented as a first embodiment, and the latter form is represented as a second embodiment. 
     First Embodiment 
       FIG. 1  is a diagram illustrating the configuration of mesh manufacturing equipment according to a first embodiment that presents the information of a correction examining portion to the user. 
     The configuration of  FIG. 1  is achieved by calculator equipment including CAD, and in  FIG. 1 , the inside of calculator equipment  110  is described as specific process functions. In  FIG. 1 , the reference numeral  100  denotes a display device connected to input means, such as a keyboard, and a process intended by the user and information presentation are given from here to the calculator equipment  110 . The calculator equipment  110  displays various process results on the screen of the display device  100 . 
     In addition, in  FIG. 1   102  denotes a so-called database,  104  and  106  denote data storage units, such as RAMs, temporarily storing computation results, and others are various process functions achieved by the computation unit of the calculator equipment  110 . 
     An example of a process procedure according to the present invention will be described below, and here, two types of mesh data are handled. One of the mesh data is data D 1  that represents the whole of a model to be inspected (inspection target model data), and the other mesh data is sample data D 2  for the correction of part of the inspection target model data D 1  (mesh correcting sample data). 
       FIG. 2  illustrates the inspection target model data D 1  and the mesh correcting sample data D 2 . First, in the inspection target model data D 1 , D 1   a  indicated by dotted lines is data from CAD, and shows a shape plotted by smooth curved lines. D 1   b  indicated by solid lines is data in mesh shape in which the curved shape of the D 1   a  is simulated as a mesh by straight lines. 
     The inspection target model data D 1  represents the whole model, and the mesh shape thereof includes the portion that should be corrected in performing analysis. Three examples of such the portion to be corrected are illustrated as the mesh correcting sample data D 2  in  FIG. 2 . The mesh correcting sample data D 2  also includes data from CAD indicated by curved dotted lines (D 21   a , D 22   a , D 23   a ), and data in mesh shape indicated by straight solid lines (D 21   b , D 22   b , D 23   b ). It is noted that in the illustrated example, the inspection target model data D 1  includes two portions that should be corrected and correspond to mesh correcting sample data D 21 . The portions to be corrected are displayed in light black. 
     In  FIG. 1 , the inspection target model data D 1  is given to an inspection target model designation unit  103  in the calculator equipment  110  by using the display device  100  connected to the input means, such as a keyboard. The inspection target model designation unit  103  includes means for designating a pair of the mesh data D 1   b  to be inspected and the CAD data D 1   a  corresponding thereto. The mesh data D 1   b  and the CAD data D 1   a  that are designated here are registered onto, for example, the RAM as the inspection target model data storage unit  104 . 
     In addition, in  FIG. 1 , the mesh correcting sample data D 2  (D 21 , D 22 , D 23 ) is given to a correction examining sample model registration unit  101  in the calculator equipment  110  by using the display device  100  connected to the input means such as a keyboard. The correction examining sample model registration unit  101  includes means for designating, as the correction examining portion, a pair of partial mesh data (D 21   b , D 22   b , D 23   b ) and partial CAD data (D 21   a , D 22   a , D 23   a ) corresponding thereto. The partial mesh data and the partial CAD data that are designated here are registered as an uncorrected sample model to the mesh correcting sample database  102 . 
     A pair of partial mesh data and partial CAD data is registered as the uncorrected sample model to the mesh correcting sample database  102 . In addition, a pair of the uncorrected sample model and corrected partial mesh data associated therewith is also registered as a corrected sample model, which will be described later. 
     A similar partial mesh retrieval unit  105  registers, with respect to the inspection target model data storage unit  104  (data D 1 ), as the correction examining portion data storage unit  106 , a partial mesh that is similar to the mesh data (D 21   b , D 22   b , D 23   b ) and the CAD data (D 21   a , D 22   a , D 23   a ) of the uncorrected sample model that are registered to the mesh correcting sample database  102 . In the case of  FIG. 2 , the two portions of the D 1  in light black that correspond to the mesh data D 21   b  of the uncorrected sample model are extracted and registered. 
     It is noted that for a method for specifically achieving the process here, it is possible to apply, as a method for evaluating the similarity of CAD data, for example, techniques disclosed in “Hongshen Wang, Lin Zhang and Yonggui Zhang, “Partial Matching of 3D CAD Models with Attribute Graph”, Applied Mechanics and Materials, Vol. 528 (2014), pp. 302-309”, and “Makoto Onodera et al., “Development of similar sub-part recognition technique for 3D-CAD Model described by boundary representation”, The Japan Society of Mechanical Engineers, The Proceedings of the 25th Design &amp; Systems Conference (2015)”. 
     In these methods, whether CAD data in partial shape that is designated by a retrieval key is included in CAD data to be retrieved is quantified by an index of similarity. In addition, the similarity is the weighted average of the similarity of each structure geometric shape (surface and line) of CAD data. It is noted that the similarity of each structure geometric shape is calculated based on geometric information, such as an area, a line length, a surface type (a plane, a cylindrical surface, and a free-form curved surface), and a curvature. This method is a method for determining whether CAD data in partial shape is included in CAD data to be retrieved. 
     As a method for evaluating the similarity of mesh data, for example, the method for evaluating the similarity of CAD data is applied. The similarity of mesh data is evaluated by the weighted average of the similarity of each structure element of the mesh data. The similarity of each structure element is calculated based on element information, such as a volume, an area, an element type (a triangle, a square, a tetrahedron, and a hexahedron), an element normal line, and the distance between nodes. With this, like the similarity of CAD data, the similarity of mesh data can be evaluated. 
     A correction examining portion highlighting unit  107  configures the display screen of the display device  100  by highlighting, with respect to the mesh data to be inspected, the partial mesh that is registered to the correction examining portion data storage unit  106 . 
     A specific process case will be described below with reference to the drawings. In this case, a case of manufacturing a neutral shell mesh at the middle of a thin plate structure will be described as an example. 
     First, pairs (D 21   b  and D 21   a , D 22   b  and D 22   a , and D 23   b  and D 23   a ) of three partial meshes (D 21   b , D 22   b , and D 23   b ) and partial CAD (D 21   a , D 22   a , and D 23   a ) that are represented in the D 2  are registered as the uncorrected sample model to the mesh correcting sample database  102  in  FIG. 1 . In addition, the model represented in the D 1  (mesh D 1   b  and CAD D 1   a ) is designated as the inspection target model data storage unit  104 . It is noted that in this example, the element edges of the mesh data are indicated by solid lines, and the ridges of the CAD data are indicated by dashed lines. 
     Then, the similar partial mesh retrieval unit  105  retrieves a similar partial mesh in such a manner that the data D 1  of the inspection target model data storage unit  104  is to be inspected and that the data D 2  of the uncorrected sample model of the mesh correcting sample database  102  (D 21 , D 22 , D 23 ) is a retrieval key. As a result, dot hatchings A and B of the partial mesh D 1   a  are determined to be similar to the uncorrected sample model D 21 , and are then registered to the correction examining portion data storage unit  106 . 
     Then, the correction examining portion highlighting unit  107  highlights the partial mesh D 2  of the correction examining portion data storage unit  106  with respect to the inspection target model data D 1  on the display device  100 . As the highlighting means, a method by changing the color of only the partial mesh D 2  of the correction examining portion data storage unit  106  for display and a method by changing the transparent degree of the mesh other than the partial mesh D 2  of the correction examining portion data storage unit  106  for display are used. 
     For the contents displayed on the display device  100  as the result of the above process, the partial mesh that is retrieved as being similar to the mesh data for the inspection target model is plotted and displayed. And, the similar portion of the mesh data for the inspection target model is highlighted. 
     In this way, the partial mesh D 2  can be registered as the sample, and from the similarity to the mesh D 2 , the partial mesh that is required to be corrected can be retrieved. Therefore, the mesh specification is not required to be quantified, thereby enhancing efficiency. 
     In addition, the similarity of the CAD data associated with the mesh is evaluated. Therefore, excessive detection can be prevented. For example, in the example of  FIG. 2 , the two cross hatchings A and B are similarity-determined. The partial mesh represented in the cross hatching A is similar to the mesh data of the uncorrected sample model D 22 . On the contrary, the CAD data is not similar because the CAD data on the inspection target model side includes a plane and the CAD data of the uncorrected sample model includes a plurality of cylindrical surfaces and planes. Therefore, the cross hatching A is not hit in retrieval. In this way, only the portion in which the similarity of the CAD and the similarity of the mesh are both high is retrieved. It is thus possible to respond to the differing of the specification of the mesh that is required to be manufactured for each portion. 
     By a series of processes illustrated in  FIG. 1 , the user can easily grasp the correction examining portion for the inspection target model data D 1 . Typically, when the inspection target model data D 1  includes a large model or a model in complicated shape, and on the other hand, when there are a large number of correction examining portions, the specific correction examining portion can be made visible and grasped on the inspection target model data D 1  by the first embodiment of the present invention. This enables significant time reduction in performing later processes. 
     The mesh manufacturing equipment that has been described above as the first embodiment includes the correction examining sample model registration unit  101  registering, as the uncorrected sample model, the partial mesh data for the correction examining portion and the CAD data associated therewith to the mesh correcting sample database  102 , the inspection target model designation unit  103  designating the inspection target model data storage unit  104  including the mesh data and the CAD data that are to be inspected, the similar partial mesh retrieval unit  105  registering, with respect to the inspection target model data storage unit  104 , as the correction examining portion data, the partial mesh that is similar to the mesh data and the CAD data of the uncorrected sample model that are registered to the mesh correcting sample database  102 , and the correction examining portion highlighting unit  107  highlighting the correction examining portion data storage unit  106 . 
     Second Embodiment 
     In a second embodiment, a case of performing actual correction in addition to presenting the information of the correction examining portion to the user will be described. 
     In the second embodiment, since the portion to be corrected is automatically corrected, the finding in  FIG. 3  is further held to be used for correction. 
       FIG. 3  additionally displays, as D 3 , the information of the finding about the correction in  FIG. 2 . This is the finding in which the D 21  should be corrected to D 31 , the D 22  should be corrected to D 32 , and the D 23  should be corrected to D 33 . For example, when the finding in which the D 21  and D 22  each include a triangular portion in the shape sectioned by the mesh but should be simulated in, for example, square shape in strength is obtained, the D 21  and D 22  should be respectively replaced with (or corrected to) the D 31  and D 32  in mesh shape including a square only. 
       FIG. 4  is a diagram illustrating the configuration of mesh manufacturing equipment according to the second embodiment that performs actual correction in addition to presenting the information of the correction examining portion to the user. In  FIG. 4 , the mesh manufacturing equipment including a correcting function is further configured as below. First, a corrected sample mesh registration unit  201  is newly added, and the corrected sample mesh registration unit  201  includes means for designating the corrected sample mesh D 3  corresponding to the uncorrected sample model. The corrected sample mesh D 3  that is designated here is associated with the uncorrected sample model D 2 , and is registered to the mesh correcting sample database  102 . For example, for preparation, the D 31  is associated with the D 21 , the D 32  is associated with the D 22 , and the D 33  is associated with the D 23 . 
     In the first embodiment in  FIG. 1 , the detected correction examining portion is only displayed on the display device, whereas in the second embodiment in  FIG. 4 , the correction thereof is successively executed. A mesh replacement unit  202  replaces the correction examining portion data D 2  that is retrieved as being similar to the uncorrected sample model D 2  with the corrected sample mesh D 3  corresponding thereto, which is then registered as corrected mesh data  203 . 
     In a representative replacing method, a coordinate transform matrix so that the normal lines and coordinates of the structure geometric shapes in similar correspondence relationship are matched is determined, the coordinate transform matrix is applied to the corresponding corrected sample mesh, and coordinate transformation is performed. Thereafter, with respect to the inspection target model data storage unit  104 , the partial mesh for the correction examining portion data D 2  is deleted, and the corrected sample mesh D 3  that is subjected to positioning node movement is then added. It is noted that when the number of nodes of the boundary of the correction examining portion data D 2  and the number of nodes of the boundary of the corrected sample mesh D 3  are different, a node addition or deletion process is performed with respect to the boundary of the correction examining portion data D 2 . Further, a one-to-one correspondence relationship is determined with respect to the nodes of the boundaries based on an index, such as a distance, and the nodes in the correspondence relationship are then connected. 
     Successively, an example of the procedure of the mesh correction process and the flow of data in which the analysis mesh manufacturing equipment according to the second embodiment of the present invention is used will be described with reference to  FIGS. 3 and 5 . It is noted that  FIG. 5  is a diagram illustrating the corrected state of the inspection target model data D 1  in  FIG. 3 . 
     In  FIG. 3 , first, corresponding to the uncorrected sample model D 2  shown in the D 21  to D 23 , the corrected sample mesh D 3  of the D 31  to D 33  is registered to the mesh correcting sample database  102 . In addition, it is determined by the similar partial mesh retrieval unit  105  that the partial mesh that is represented in the dot hatching B of the whole model D 3  that is stored in the inspection target model data storage unit  104  is similar to the uncorrected sample model D 21 , and the partial mesh is then registered to the correction examining portion data storage unit  106 . 
     Successively, the mesh replacement unit  202  determines a coordinate transform matrix so that the normal lines and coordinates of the structure geometric shapes in similar correspondence relationship are matched, applies the coordinate transform matrix to the corrected sample mesh D 31  corresponding to the uncorrected sample model D 21 , and performs coordinate transformation. Thereafter, with respect to the inspection target model data D 3 , the partial mesh of the dot hatching B that is the correction examining portion data is deleted, and a mesh that is coordinate-transformed with respect to the corrected sample mesh represented in the D 31  is then added. 
     A state where the portion of the dot hatching B of the whole model D 3  in  FIG. 3  is replaced with the corrected sample mesh D 31  for coordinate transformation is represented as B 1  of  501  in  FIG. 5 . From this, when the shape of the portion of the B 1  is compared with the shape of the dot hatching B that is the correction examining portion data before correction, the number of nodes of the boundary of the dot hatching B is different from the number of nodes of the boundary of the corrected sample mesh. Therefore, node addition is subjected to the boundary of the dot hatching B that is the correction examining portion data, and the related element is then subdivided. B 2  of  502  in  FIG. 5  represents a state where node addition is subjected to the boundary of the dot hatching B. 
     Further, a one-to-one correspondence relationship is determined with respect to the nodes of the boundaries of the B 1  and the dot hatching B based on an index, such as a distance, and the nodes in the correspondence relationship are then connected. This result is finally obtained as the analysis mesh that is represented in  502  in  FIG. 5 . By the correction of the corresponding portion, the range of change is finally extended to B 3 . It is noted that although in this example, the method for sequentially extending the element edges for division toward the opposite sides is adopted as the subdivision of the element, a method for subdividing only the element without extending the element can also be selected. 
     In this way, the corrected sample mesh is also managed by the mesh correcting sample database  102 . Therefore, the mesh correction can be automated. In addition, even when the mesh specification is changed, the sample mesh is simply replaced. Therefore, the means for retrieving the portion to be corrected is not required to be permanently improved. 
     The analysis mesh manufacturing equipment that has been described above as the second embodiment includes the corrected sample mesh registration unit  201  registering, as the corrected sample model, the corrected partial mesh data associated with the uncorrected sample model to the mesh correcting sample database  102 , and the mesh replacement unit  202  replacing the correction examining portion data storage unit  106  that is retrieved as being similar to the uncorrected sample model, with the corrected sample model corresponding thereto, and registering the corrected sample model as the corrected mesh data  203 . 
     Third Embodiment 
     In a third embodiment, another case of the analysis process procedure of the analysis mesh manufacturing equipment according to the present invention will be described. 
     First,  FIG. 6  is a diagram illustrating another case of the inspection target model data D 1 , the mesh correcting sample data D 2 , and the corrected sample mesh D 3 , and corresponding to  FIG. 3 . 
     First, pairs (D 24   b  and D 24   a , D 25   b  and D 25   a , and D 26   b  and D 26   a ) of three partial meshes D 2   b  (the D 24   b , the D 25   b , and the D 26   b ) and partial CAD D 2   a  (the D 24   a , the D 25   a , and the D 26   a ) that are respectively represented in the D 2  (D 24 , D 25 , and D 26 ) are registered as the uncorrected sample model of the mesh correcting sample database  102 . In addition, corrected sample meshes D 34 , D 35 , and D 36  that respectively correspond to the uncorrected sample models D 24 , D 25 , and D 26  are registered to the mesh correcting sample database  102 . Further, the inspection target model D 1  (mesh D 1   a  and CAD D 1   b ) is designated to the inspection target model data storage unit  104 . 
     Then, the similar partial mesh retrieval unit  105  retrieves a similar partial mesh in such a manner that the inspection target model data D 1  (mesh D 1   a  and CAD D 1   b ) is to be inspected and that the uncorrected sample model D 2  (D 24 , D 25 , D 26 ) is a retrieval key. As a result, a partial mesh  603   a  is determined to be similar to the uncorrected sample model D 24 . In addition, a partial mesh  603   b  is determined to be similar to the uncorrected sample model D 25 . These two partial meshes are then registered as the correction examining portion data storage unit  106 . 
     Then, since the same element is similarity-retrieved as the correction examining portion data from the plurality of types of uncorrected samples (D 24  and D 25 ), the mesh replacement unit  202  designates to which uncorrected sample the corrected sample mesh to be adopted correspond. 
     An example of the operation screen of the display device  100  in this case is illustrated in  FIG. 8 . The whole model D 1  is displayed in an area  801  of the operation screen, and the target element portions that are stored in the correction examining portion data storage unit  106  are highlighted in areas  802  and  803 . The target element portion that is similarity-extracted as two sides of the pentagon is displayed in the area  802 , and the target element portion that is similarity-extracted as the pentagon is displayed in the area  803 . Further, the uncorrected sample model D 24  is displayed in an area  804 , the uncorrected sample model D 25  is displayed in an area  805 , the corrected sample mesh D 34  is displayed in an area  806 , and the corrected sample mesh D 35  is displayed in an area  807 . 
     The user of this equipment selects the corrected sample mesh to be adopted from this screen. In this example, the corrected sample mesh D 35  corresponding to the uncorrected sample model D 25  is selected. The mesh replacement unit  202  determines a coordinate transform matrix so that the normal lines and coordinates of the structure geometric shapes in similar correspondence relationship are matched, applies the coordinate transform matrix to the corresponding corrected sample mesh, and performs coordinate transformation. Thereafter, in the inspection target model D 1 , the partial mesh of the correction examining portion data represented in the  603   b  is deleted, and a mesh that is subjected to positioning node movement with respect to the corrected sample mesh D 35  is added to this position. With this, the analysis mesh represented in  701  in  FIG. 7  is obtained. 
     In this case, the number of nodes of the boundary of the correction examining portion data  603   b  and the number of nodes of the boundary of the corrected sample mesh D 35  are different. Therefore, node addition is subjected to the boundary of the correction examining portion data  603   b , and the related element is then subdivided. Further, a one-to-one correspondence relationship is determined with respect to the nodes of the boundaries based on an index such as a distance, and the nodes in the correspondence relationship are then connected. As a result, the analysis mesh represented in  702  in  FIG. 7  is obtained. It is noted that in the previously illustrated example, the subdivision of the element is extended toward the opposite sides, but in this example, only the element is subdivided. 
     In this way, the partial mesh can be registered as the sample, and from the similarity to the mesh, the partial mesh that is required to be corrected can be retrieved. Therefore, the mesh specification is not required to be quantified, thereby enhancing efficiency. 
     In addition, even when the mesh specification is changed, the sample mesh is simply replaced. Therefore, the means for retrieving the portion to be corrected is not required to be permanently improved. Further, both of the similarity of the CAD data associated with the mesh and the similarity of the mesh data are evaluated. It is thus possible to respond to the differing of the specification of the mesh that is required to be manufactured for each portion. 
     LIST OF REFERENCE SIGNS 
     
         
           101 : Correction examining sample model registration unit 
           102 : Mesh correcting sample database 
           103 : Inspection target model designation unit 
           104 : Inspection target model data storage unit 
           105 : Similar partial mesh retrieval unit 
           106 : Correction examining portion data storage unit 
           107 : Correction examining portion highlighting unit 
           201 : Corrected sample mesh registration unit 
           202 : Mesh replacement unit 
           203 : Corrected mesh data storage unit