WO2005086034A1 - 数値解析モデルデータ生成プログラム、数値解析モデルデータ生成方法、および数値解析モデルデータ生成装置 - Google Patents
数値解析モデルデータ生成プログラム、数値解析モデルデータ生成方法、および数値解析モデルデータ生成装置 Download PDFInfo
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- WO2005086034A1 WO2005086034A1 PCT/JP2005/001789 JP2005001789W WO2005086034A1 WO 2005086034 A1 WO2005086034 A1 WO 2005086034A1 JP 2005001789 W JP2005001789 W JP 2005001789W WO 2005086034 A1 WO2005086034 A1 WO 2005086034A1
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- the present invention relates to a numerical analysis model data generation program, a numerical analysis model data generation method, and a numerical analysis model for generating model data used for various types of numerical analysis based on shape data of a three-dimensional structure. More particularly, the present invention relates to a numerical analysis model data generation program, method, and apparatus for generating a small amount of numerical analysis model data without significantly affecting the accuracy of numerical analysis.
- Various numerical analysis software have been developed as tools for performing such analysis by computer.
- numerical analysis such as heat transfer analysis, mechanical analysis, and electromagnetic field analysis of a structure using a computer
- the three-dimensional shape data of the structure to be numerically analyzed is manually divided into a large number of polyhedral elements by a predetermined mesh, for example
- a model for numerical analysis is generated by mesh division, and characteristic values representing the characteristics of each polyhedron element are obtained.
- the properties of the entire structure are calculated as a set of properties of many polyhedral elements.
- the surface of the shape of the structure to be analyzed at the time of performing the mesh division does not necessarily match the surface of the mesh to be divided.
- the analysis processing speed becomes slow due to an effect such as an increase in the number of polyhedral elements to be analyzed.
- a calculation region of a structure is defined by a surface shape, a standardized division space composed of a large number of polyhedral microelements is defined, and a large number of these polyhedral microelements are defined.
- a microelement whose volume ratio of a part included in the calculation area is smaller than a predetermined minimum filling rate is deleted, and a set of remaining microelements is used as a model for numerical analysis that approximates the calculation area.
- an operator inputs map information in an interactive manner with a computer, performs a two-dimensional meshing operation, and further performs an analysis region analysis.
- simple operations such as designation and designation of the number of divisions in the height direction or the division width, three-dimensional mesh data is automatically generated by the three-dimensional mesh generation unit in the computer.
- a two-dimensional numerical calculation mesh having a triangle or a quadrilateral as a basic shape has three or four vertices.
- a three-dimensional numerical computation mesh having a complicated shape is accurately generated.
- Patent Document 1 JP-A-10-255077
- Patent Document 2 JP-A-5-307590
- Patent Document 3 JP-A-5-101152
- Patent Document 4 JP 2001-155187 A
- the model for numerical analysis has minute voids, so that it is compared with the case of performing the heat transfer analysis of the former model for numerical analysis.
- the amount of data, and hence the time for numerical analysis, will increase.
- An object of the present invention is to provide a numerical analysis model data generation program, a numerical analysis model data generation method, and a numerical analysis model data generation device capable of generating analysis model data.
- a first aspect of the present invention provides a computer, comprising: a numerical value generator for generating numerical analysis model data used for numerical analysis based on three-dimensional shape data of a structure to be analyzed; An analysis model data generation program for inputting three-dimensional shape data defining a structure, extracting gaps included in the input three-dimensional shape data to determine the size of the gaps, If the size of the gap is smaller than a predetermined size V, the procedure is to fill the gap to obtain numerical analysis model data.
- a second aspect of the present invention is a numerical analysis model data generation method for generating numerical analysis model data used for numerical analysis based on three-dimensional shape data of a structure to be analyzed. Is input, and the size of the void is obtained by extracting voids included in the input three-dimensional shape data. If the size of the void is smaller than a predetermined size, A method for generating numerical analysis model data, characterized by filling the gap to obtain numerical analysis model data.
- a third aspect of the present invention is a numerical analysis model data generation device for generating numerical analysis model data used for numerical analysis based on three-dimensional shape data of a structure to be analyzed, comprising: Shape data inputting means for inputting three-dimensional shape data defining the shape, void extracting means for extracting voids included in the input three-dimensional shape data, determining the size of the extracted voids, Is smaller than a predetermined size, and a simplification means for filling the gap is provided, and the three-dimensional shape data simplified by the simplification means is used as numerical analysis model data.
- Shape data inputting means for inputting three-dimensional shape data defining the shape
- void extracting means for extracting voids included in the input three-dimensional shape data, determining the size of the extracted voids, Is smaller than a predetermined size, and a simplification means for filling the gap is provided, and the three-dimensional shape data simplified by the simplification means is used as numerical analysis model data.
- a fourth aspect of the present invention is a numerical analysis model data generation method for generating numerical analysis model data used for numerical analysis based on three-dimensional shape data of a structure to be analyzed.
- the three-dimensional shape data defining the polyhedral shape is defined, and the input three-dimensional shape data is divided into a plurality of (many) polyhedral microelements by a predetermined mesh in a three-dimensional space serving as an analysis unit.
- a method for generating numerical analysis model data characterized in that the method converts the data into filled microelements and sets a set of all microelements including the filled microelements as numerical analysis model data.
- a fifth aspect of the present invention is a numerical analysis model data generation device for generating numerical analysis model data used for numerical analysis based on three-dimensional shape data of a structure to be analyzed.
- Shape data means for inputting three-dimensional shape data defining the shape, and a polyhedral micro element for generating a plurality of polyhedral micro elements by dividing the input three-dimensional shape data by a predetermined mesh in a three-dimensional space serving as an analysis unit
- a simplification means for converting a microelement having a larger ratio into a filled microelement; and, based on a set of all the microelements including the filled microelement, the above simplification means.
- Provided is a numerical analysis model data generation apparatus characterized
- the present invention when converting the three-dimensional shape data of a structure to be numerically analyzed into model data for numerical analysis, even if it is filled, it does not significantly affect the accuracy of numerical analysis.
- the amount of numerical analysis model data can be reduced, thereby shortening the time required for numerical analysis.
- FIG. 1 shows a conventional numerical analysis model data generation method, in which a structure 1 is meshed. It is a conceptual diagram showing the example which divided.
- FIG. 2 is a conceptual diagram showing a numerical analysis model obtained by approximating a structure 1 divided by a mesh by a conventional numerical analysis model data generation method.
- FIG. 3 is a conceptual diagram showing an example in which a structure 2 is divided by a mesh according to a conventional numerical analysis model data generation method.
- FIG. 4 is a conceptual diagram showing a numerical analysis model obtained by approximating a structure 2 divided by a mesh by a conventional numerical analysis model data generation method.
- FIG. 5 is a flowchart showing a processing flow for generating numerical analysis model data based on the principle of the present invention.
- FIG. 6 is a block diagram showing a configuration of an embodiment of a numerical analysis model data generation device according to the present invention.
- FIG. 7 is a flowchart for explaining an embodiment of a numerical analysis model data generation method according to the present invention.
- FIG. 8 is a perspective view showing an example of a structure to be numerically analyzed.
- FIG. 9 is a conceptual diagram showing an example of numerical analysis model data obtained by simplifying the example of the structure to be numerically analyzed in FIG.
- FIG. 1 is a conceptual diagram showing an example in which a structure 1 is divided by a mesh according to a conventional numerical analysis model data generation method.
- FIG. 1 shows an example in which a large number of polyhedral microelements are generated by directly dividing a structure 1 to be analyzed by a mesh.
- the structure 1 to be analyzed has a three-dimensional shape, but here, for simplicity of description, the structure 1 is represented by only two-dimensional shape data.
- the solid line indicates the shape of the structure 1
- the dotted line indicates the normalized divided space in which the structure 1 is placed. In this case, the two It is assumed that the face element is a small element smaller than a predetermined minimum filling rate.
- FIG. 2 is a conceptual diagram showing a numerical analysis model obtained by approximating the structure 1 divided by a mesh by a conventional numerical analysis model data generation method.
- a numerical analysis model that approximates the structure 1 divided into polyhedral microelements as shown in FIG. 1 using a mesh by the method described in Patent Document 1 is shown.
- the expression “numerical analysis model” is used. Therefore, when describing the conventional method, the “numerical analysis model data” used in the present invention is used.
- the “numerical analysis model” t In the example shown in FIG. 2, the minute element indicated by an arrow as indicated by a dashed line is smaller than a predetermined minimum filling rate, so that the minute element is deleted. Further, in the example of FIG. 2, a numerical analysis model is generated in which the apex on the left side of the structure 1 is moved downward by deleting the above-mentioned minute element, thereby simplifying the structure.
- FIG. 3 is a conceptual diagram showing an example in which the structure 2 is divided by a mesh in the conventional numerical analysis model data generation method.
- a structure 2 including a minute void which does not significantly affect the analysis accuracy as shown by hatching in the arrow, is illustrated.
- FIG. 3 shows an example in which the structure 2 to be analyzed is directly divided by a mesh to generate a large number of polyhedral microelements.
- FIG. 4 is a conceptual diagram showing a numerical analysis model obtained by approximating the structure 2 divided by a mesh using a conventional numerical analysis model data generation method.
- a numerical analysis model similar to the structure 2 divided into polyhedral microelements as shown in FIG. 3 using a mesh by the method described in Patent Document 1 is shown.
- the numerical values obtained by deleting the small element portions as indicated by the dashed line and moving the left vertex of the structure 2 are simplified.
- An analysis model has been generated. However, in the example of FIG. 4, the analysis model is generated as it is for the minute gaps indicated by the arrows.
- a normal structure includes a large number of minute voids such as screw holes.
- minute voids such as screw holes.
- minute voids are left as they are, and these voids reduce the amount of data representing the structure. This leads to a problem of increasing the time required for numerical analysis.
- Minute voids or notches in ordinary structures It is known that if the gap is smaller than a predetermined size, even if the gap is filled, that is, deleted as data, it does not significantly affect the heat transfer characteristics of the structure. For example, the heat transfer analysis result of the numerical analysis model of the structure 1 without the minute voids as shown in FIG.
- FIG. 5 is a flowchart showing a processing flow for generating numerical analysis model data based on the principle of the present invention.
- the processing flow for generating the numerical analysis model data is shown by a flowchart.
- step S11 three-dimensional shape data of a structure to be numerically analyzed is input.
- step S11 one or more voids included in the structure to be analyzed are extracted, and the size of each void is stored in a storage unit such as a RAM (random 'access' memory) or an external storage device. save.
- step S12 the gap stored in the storage unit is searched, and in step S13, the size of each gap, for example, the volume of the gap is compared with a predetermined value. If the size of the gap to be compared is smaller than the predetermined value, the gap is filled in step S14, and if it is larger, the process proceeds to step S15 as it is.
- step S15 it is determined whether or not there is an unprocessed space. If there is an unprocessed space, the process returns to step S12 to search for a space again. On the other hand, if there is no unprocessed air gap in step S15, the process proceeds to step S16, and the processing result of step S11—step S15 is generated as numerical analysis model data. The numerical analysis model data generated in this way is finally output by computer power.
- FIG. 6 is a block diagram showing a configuration of an embodiment of a numerical analysis model data generation device according to the present invention. Here, the configuration of the numerical analysis model data generation device 10 according to the third embodiment of the present invention is shown in a simplified manner.
- the shape data input means 11 has a function of inputting three-dimensional shape data defining a structure to be analyzed.
- the void extracting means 12 has a function of extracting one or a plurality of voids included in the three-dimensional shape data input from the shape data input means 11.
- the simplification unit 13 has a function of calculating the size of each of the gaps extracted by the gap extraction unit 12 and filling the gap when the size of the gap is smaller than a predetermined size.
- the three-dimensional shape data simplified by the simplification means 13 is used as numerical analysis model data.
- the numerical analysis model data generation device 10 of FIG. 10 is a numerical analysis model data generation device 10 of FIG.
- the shape data input unit 11, the void extraction unit 12, and the simplification unit 13 in the numerical analysis model data generation device 10 are programs stored in the storage unit in advance (for example, as shown in FIG. 5). This is realized by reading out a numerical analysis model data generation program for executing such a processing flow) by the CPU and executing a predetermined processing flow.
- the above-mentioned shape data input means 11, void extraction means 12, and simplification means 13 can be realized by software of a computer.
- the numerical analysis model data generation device includes a Shape data means for inputting three-dimensional shape data defining a body, and a polyhedron for generating a large number of polyhedrons by dividing the input three-dimensional shape data by a predetermined mesh in a three-dimensional space serving as an analysis unit Determining the ratio of the volume of the microelements constituting each of the polyhedral microelements to the volume of the substantial analysis unit; and determining the ratio of the volume of the microelements to the volume of the analysis unit is predetermined.
- the simplification means for converting a small element larger than the maximum filling rate into a filled small element.
- the three-dimensional shape data simplified by the simplification means is used as the numerical analysis model data based on a set of all the small elements including the filled small elements.
- the actual volume of the microelement and the volume of the microelement in a substantial analysis unit are calculated. Are compared to determine the ratio of the volume of the microelement to the volume of the microelement in the analysis unit.
- the simplification unit determines that filling the gaps of the microelements does not significantly affect the accuracy of the numerical analysis. Converts to microelements that fill the voids.
- FIG. 7 is a flowchart for explaining an embodiment of the numerical analysis model data generation method according to the present invention.
- An example of such a numerical analysis model data generation method is shown by a flowchart.
- step S31 three-dimensional shape data of a structure to be numerically analyzed is input.
- step S33 determine the cross-sectional shape of each structure in the standardized mesh.
- step S33 one or more voids included in each cross-sectional shape are determined, and the area information of each void is stored in the storage unit.
- step S34 the stored voids are sequentially searched, and in step S35, it is determined whether or not the area of the void is smaller than a predetermined value (the area of the void is smaller than the predetermined value). If it is determined in step S35 that the area of the gap is smaller than a predetermined value, in step S36, the gap is determined to be the same as the surrounding structure, and the gap is filled. (Ie, delete the void data).
- step S40 the cross-sectional shape (mesh) on each axis divided by a predetermined standardized mesh is synthesized. And generate numerical analysis model data. The computer power of the numerical analysis model data generated in this way is finally output.
- FIG. 8 is a perspective view showing an example of a structure to be numerically analyzed.
- the gap indicated by the tip of the dotted arrow indicates a gap determined to be larger than the predetermined value, and the gap positioned on the extension of the solid arrow is smaller than the predetermined value. Indicates the gap determined to be.
- the cross-sectional shape of each of the structures 3 is determined for each of the standardized meshes. Become.
- FIG. 9 is a conceptual diagram showing an example of numerical analysis model data obtained by simplifying the example of the structure to be numerically analyzed in FIG.
- the three-dimensional shape data of the structure 3 simplified by performing the processing shown in the flowchart of FIG. 7 is shown as numerical analysis model data according to the present invention.
- the gap indicated by the tip of the dotted arrow is a gap that has been left unfilled because it was determined to be larger than the predetermined value.
- the gap located on the extension of the solid arrow is determined to be smaller than the predetermined value, so that the gap is filled and deleted as data. You. As a result, in FIG. 9, all the voids existing on the extension of the solid arrow part have disappeared.
- the coordinate system for generating the numerical analysis model data is also the structure to be analyzed. It is desirable to use a coordinate system that defines the shape of the body.
- the numerical analysis model data generation method and the like of the present invention when generating numerical analysis model data based on the three-dimensional shape data of a structure to be analyzed, a large number of structures are to be analyzed. By filling (filling) small gaps such as screw holes that are included, that is, deleting (filling) as data, the numerical value of the data amount can be reduced without greatly affecting the accuracy of numerical analysis. Analysis model data can be generated. As a result, the time required for the numerical analysis can be reduced without significantly affecting the accuracy of the numerical analysis, and the speed of the numerical analysis can be increased, which is very useful.
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JP2006510624A JP4411322B2 (ja) | 2004-03-09 | 2005-02-07 | 数値解析モデルデータ生成プログラム、数値解析モデルデータ生成方法、および数値解析モデルデータ生成装置 |
US11/509,618 US8014978B2 (en) | 2004-03-09 | 2006-08-25 | Numerical analysis model data generating method for filling holes in a mesh |
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Cited By (2)
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US8533184B2 (en) * | 2006-02-08 | 2013-09-10 | Fujitsu Limited | Numerical analysis data creating method and apparatus, and computer-readable program |
US9330207B2 (en) | 2011-12-09 | 2016-05-03 | Fujitsu Limited | Support method, recording medium, and design support device to calculate a volume of a three-dimensional model |
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JP4664218B2 (ja) * | 2006-02-28 | 2011-04-06 | 国立大学法人北海道大学 | メッシュモデル生成システム |
JP4814802B2 (ja) * | 2007-01-10 | 2011-11-16 | 富士通株式会社 | 解析モデル作成プログラム、解析モデル作成装置、解析モデル作成方法、および該解析モデル作成方法を含む装置の製造方法 |
JP4636338B2 (ja) * | 2007-03-28 | 2011-02-23 | ソニー株式会社 | 表面抽出方法、表面抽出装置及びプログラム |
US20090284528A1 (en) * | 2008-05-15 | 2009-11-19 | Tyson Wayne Jensen | Software processing apparatus and method for creating three-dimensional topologically complete surface boundary representations from arbitrary polygon models |
JP2013156726A (ja) * | 2012-01-27 | 2013-08-15 | Fujitsu Ltd | 予測値算出方法、プログラムおよび設計支援装置 |
CN109064542B (zh) * | 2018-06-06 | 2019-11-19 | 贝壳找房(北京)科技有限公司 | 三维模型表面空洞填补方法和装置 |
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JP2003167927A (ja) * | 2001-12-03 | 2003-06-13 | Sharp Corp | 要素分割装置、要素分割方法、要素分割プログラムおよび要素分割プログラムを記録したコンピュータ読取可能な記録媒体 |
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JPH05101152A (ja) | 1991-10-09 | 1993-04-23 | Hitachi Ltd | 3次元数値計算メツシユ生成方法 |
JPH05307590A (ja) | 1992-04-28 | 1993-11-19 | Hitachi Ltd | 数値解析用空間メッシュ生成装置及び数値解析装置 |
JPH08320947A (ja) * | 1995-05-25 | 1996-12-03 | Matsushita Electric Ind Co Ltd | 数値解析用メッシュ作成方法及び装置 |
JP3787743B2 (ja) * | 1998-11-18 | 2006-06-21 | 株式会社日立製作所 | 数値解析用メッシュ生成装置 |
JP2001155187A (ja) | 1999-11-25 | 2001-06-08 | Hitachi Ltd | 数値解析用自動メッシュ生成方法 |
US7023432B2 (en) * | 2001-09-24 | 2006-04-04 | Geomagic, Inc. | Methods, apparatus and computer program products that reconstruct surfaces from data point sets |
US7272264B2 (en) * | 2003-09-11 | 2007-09-18 | International Business Machines Corporation | System and method for hole filling in 3D models |
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- 2005-02-07 JP JP2006510624A patent/JP4411322B2/ja not_active Expired - Fee Related
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JPH10255077A (ja) * | 1997-03-06 | 1998-09-25 | Toray Ind Inc | 解析モデルの生成方法および装置ならびに射出成形過程の解析方法 |
JP2003167927A (ja) * | 2001-12-03 | 2003-06-13 | Sharp Corp | 要素分割装置、要素分割方法、要素分割プログラムおよび要素分割プログラムを記録したコンピュータ読取可能な記録媒体 |
Cited By (2)
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US8533184B2 (en) * | 2006-02-08 | 2013-09-10 | Fujitsu Limited | Numerical analysis data creating method and apparatus, and computer-readable program |
US9330207B2 (en) | 2011-12-09 | 2016-05-03 | Fujitsu Limited | Support method, recording medium, and design support device to calculate a volume of a three-dimensional model |
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JP4411322B2 (ja) | 2010-02-10 |
US20070005314A1 (en) | 2007-01-04 |
US8014978B2 (en) | 2011-09-06 |
JPWO2005086034A1 (ja) | 2008-01-24 |
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