CN102063532A - Grid transforming method in multi-disciplinary optimum design - Google Patents
Grid transforming method in multi-disciplinary optimum design Download PDFInfo
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- CN102063532A CN102063532A CN2010106046284A CN201010604628A CN102063532A CN 102063532 A CN102063532 A CN 102063532A CN 2010106046284 A CN2010106046284 A CN 2010106046284A CN 201010604628 A CN201010604628 A CN 201010604628A CN 102063532 A CN102063532 A CN 102063532A
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Abstract
The invention relate to a model processing and transforming technology in multi-disciplinary optimum design, in particular to a grid transforming method in multi-disciplinary optimum design for structural, electromagnetic and thermal coupling analysis of a high density machine case. The method is characterized by comprising the following steps of: (1) firstly introducing a parameterization CAD (Computer-Aided Design) solid model to a structural analysis model for carrying out the structural analysis; (2) completing the structural analysis, then outputting a structure grid file containing coordinate, displacement and unit information of all nodes; and (3) inputting the structure grid file to a thermal analysis network and an electromagnetic analysis network for carrying out thermal and electromagnetic analysis. The invention provides the grid transforming method for realizing the multi-disciplinary optimum design through a set of discrete grid transferring deformation information when a concrete algorithm or even analysis software used by each physical field is determined.
Description
Technical field
The present invention relates to the grid conversion method in the multidisciplinary optimal design in models treated and switch technology in a kind of multidisciplinary optimal design, the particularly structure of high density cabinet, electromagnetism, the thermal coupling analysis.
Background technology
Need to carry out many coupling analysis of electric heating in the multidisciplinary optimal design of high density cabinet machine, the analytical approach of traditional dynamo-electric thermal release is: parameterized model will be converted to structural model, electromagnetic model, thermoanalytical model earlier, directly entering corresponding analysis software, carry out analysis separately, obtain separate analysis result, analyze between the subject without any the information transmission for three.
When carrying out many coupling analysis, need between each physical field, transmit coupling information.Modal is that malformation is delivered in temperature analysis module and the emi analysis module.Although the physical law difference of three subject institute foundations, modern numerical analysis method all is to carry out on the basis of discretize grid, if can the discrete grid block of three physical fields is unified, just can realize the transmission of coupling information easily.But in fact, Finite Element Method is used in structure analysis more, and finite element, Finite Difference-Time Domain branch, method of moment all are common methods in the emi analysis, the finite volume methods of using in the temperature analysis more.Three physical fields are the analytical approach difference not only, and grid configuration is also different.Cell type is various on the structure, and grid configuration has nothing in common with each other, and forms such as triangle, quadrilateral, tetrahedron, hexahedron are all comparatively common; Finite element method and method of moment generally are tetrahedron and triangle in the emi analysis, and Finite-Difference Time-Domain Method uses hexahedron and quadrilateral mesh; Hexahedral mesh commonly used in the temperature analysis.Thereby the grid of three physical fields of unification on the broad sense is very difficult things.
Summary of the invention
The purpose of this invention is to provide a kind ofly when having determined specific algorithm that each physical field uses even analysis software, transmit deformation information by a cover discrete grid block and realize grid conversion method in the multidisciplinary optimal design.
The object of the present invention is achieved like this, the grid conversion method in the multidisciplinary optimal design, and its method feature is: it is finished as follows:
1) at first the Parametric CAD solid model is imported to and carry out structure analysis in the Structural Analysis Model;
2) after structure analysis is finished, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes;
3) the structured grid file is input to heat analysis grid and emi analysis grid and carries out heat and emi analysis.
Carry out structure analysis in the described Structural Analysis Model, need to extract plate shell surface mesh and trigonometric ratio processing and solid element surface mesh and trigonometric ratio processing in the Structural Analysis Model, need be according to the processing of classifying of the cell type of Structural Analysis Model, the face unit of two dimension to classification, judge whether it is triangular element, be, then direct extraction unit information, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes; Be not, carry out trigonometric ratio earlier and handle that the back is extraction unit information directly, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes; To the solid element of three-dimensional of classification, then need earlier internal element is removed in the complanation of hypostazation unit, extract the outside surface unit, the outer surface unit uses the processing procedure of two-dimensional surface unit then; Unit after will handling at last is combination number again, is write as the file layout that FEKO and ICEPAK can discern.
Described extraction plate shell surface mesh and carry out the trigonometric ratio process flow steps and be at first judges whether to exist the plate shell unit by step 301, if there is no, then enters and withdraws from step 305, need not extract surface mesh; If exist, enter step 302, need to select the plate shell face of extraction; Enter step 303 afterwards, get plate shell face and count Nb, making I=1(I is a counter, when being I=Nb after all plate shell units are all handled, finish processing), enter step 304, judge whether counter equals Nb, judging whether that promptly all plate shell units all dispose, is then to enter step 305, finishes plate shell unit grid and extracts flow process.Otherwise enter step 306, extract I plate shell unit, enter step 307, judge whether I unit is quadrilateral units, be then carry out step 308, the beginning trigonometric ratio is handled, and carries out the unit node information after step 310 output is handled then, enter step 311 afterwards counter is added 1, get back to step 304; Otherwise enter step 309, the output unit node information.Enter step 311 then counter is added 1, get back to step 304.
Described extraction solid element surface mesh and trigonometric ratio process flow steps are: at first judge whether to exist solid element by step 401, if there is no, then enter and withdraw from step 405, need not extract surface mesh; If exist, enter step 402, need to select the solid element of extraction; Enter step 403 afterwards, get solid element and count Nt, making I=1(I is a counter, when being I=Nt after all plate shell units are all handled, finish processing), enter step 404, judge whether counter equals Nt, judging whether that promptly all solid elements all dispose, is then to enter step 405, finishes the solid element grid and extracts flow process; Otherwise enter step 406, extract I solid element, enter step 407, extract the outside surface of this solid element and count Ns, enter step 408, counter J=1 judges whether J is this solid element outside surface number, is counter I+1 then, carry out step 404.Otherwise enter step 409, select all unit nodes on J surface, the unit node that enters step 410 pair J surface is arranged reorganization, enters step 411 output unit node information then; Then counter J is added 1, get back to step 407, judge whether to need to handle I+1 unit.
The flow process of described extraction outside surface unit is at first to carry out step 501 and get solid element information; Carry out step 502 then to each body unit, get its surface information; Then carry out step 503, judge whether each face only is present on the solid element, if not, execution in step 505 shows that then this face is the outside surface of unit, preserves this face unit, execution in step 506 is judged next solid element then; If execution in step 504 shows that then this face is the inside surface of unit, directly deletion, execution in step 506 is judged next solid element then.Handle whole body units like this, can obtain the outside surface unit information of an entity structure.
There is the quadrilateral surface unit in described wherein trigonometric ratio in handling, and be divided into two triangles to a quadrilateral, and two triangles can not overlap.
Described emi analysis need be according to the frequency tessellated mesh.
Described temperature analysis will continue to divide hexahedral mesh on the basis that imports tri patch, and air is also needed to divide grid; Material properties is set at last, and boundary condition and various excitation can begin analytical calculation.
Advantage of the present invention is: the present invention at first sets up the Parametric CAD model of casing structure, carries out structural finite element analysis; Secondly, on the basis of mechanical analysis, the cabinet Model Transfer of distortion is arrived temperature analysis software, advanced trip temperature analysis, according to the electromagnetic device power in definite coupling model of temperature analysis result, determine the electrical quantity of conductive rubber simultaneously, again malformation is delivered to emi analysis software, carry out emi analysis, obtain the analysis result of three physical fields at last.Therefore, the maximum differential of the present invention and traditional analysis is: 1, deformed configurations information enters electromagnetism and temperature analysis; 2, the electrical quantity of conductive rubber enters emi analysis; 3, temperature enters emi analysis to the influence of device.Simultaneously, three subjects have used a grid model in the coupling analysis, and three models with respect to traditional analysis significantly reduce.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing:
Fig. 1 is that the displacement structure field information is transmitted overview flow chart;
Fig. 2 is the overview flow chart that structured grid extracts;
Fig. 3 is a plate shell unit grid conveying flow;
Fig. 4 is a solid element grid conveying flow;
Fig. 5 is that the solid object surface grid extracts and trigonometric ratio;
Fig. 6 is the trigonometric ratio Mesh Processing;
Fig. 7 is a cabinet grid transformation result.
Embodiment
When carrying out structural finite element analysis, the normal cell type that adopts of casing structure is: plate unit, plate shell unit and body unit.The plate shell unit mainly contains triangular plate shell unit and quadrangular plate shell unit, and body unit then mainly contains tetrahedron element and hexahedral element.Disclosed FEKO software and ICEPAK software can both import the model with the triangle surface splicing, take the solid of tri patch sealing as entity, divide grid separately on this basis, and then finish analytical calculation.Therefore, extract distortion node coordinate and unit information on the outside surface in the structured grid, and with unit reorganization formation triangular plate, write as the grid file form that FEKO software and ICEPAK software can be discerned again respectively, malformation information can be delivered in emi analysis and the temperature analysis, realize many coupling analysis.
Grid conversion method in the multidisciplinary optimal design, as shown in Figure 1, finish as follows:
1) at first the Parametric CAD solid model is imported to and carry out structure analysis in the Structural Analysis Model;
2) after structure analysis is finished, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes;
3) the structured grid file is input to heat analysis grid and emi analysis grid and carries out heat and emi analysis.
As shown in Figure 2, Structural Analysis Model is carried out structure analysis, need to extract plate shell surface mesh and trigonometric ratio processing and solid element surface mesh and trigonometric ratio processing in the Structural Analysis Model, this process need is according to the processing of classifying of the cell type of Structural Analysis Model, the face unit (plate or shell unit) of two dimension to classification judges whether it is triangular element, is, then direct extraction unit information, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes.Be not, carry out trigonometric ratio earlier and handle that the back is extraction unit information directly, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes.
To the solid element of three-dimensional of classification, then need earlier internal element is removed in the complanation of hypostazation unit, extract the outside surface unit, the outer surface unit uses the processing procedure of two-dimensional surface unit then.Unit after will handling at last is combination number again, is write as the file layout that FEKO and ICEPAK can discern.
Extract plate shell surface mesh and carry out the trigonometric ratio process flow steps as shown in Figure 3, at first judge whether to exist the plate shell unit, if there is no, then enter and withdraw from step 305, need not extract surface mesh by step 301; If exist, enter step 302, need to select the plate shell face of extraction; Enter step 303 afterwards, get plate shell face and count Nb, making I=1(I is a counter, when being I=Nb after all plate shell units are all handled, finish processing), enter step 304, judge whether counter equals Nb, judging whether that promptly all plate shell units all dispose, is then to enter step 305, finishes plate shell unit grid and extracts flow process.Otherwise enter step 306, extract I plate shell unit, enter step 307, judge whether I unit is quadrilateral units, be then carry out step 308, the beginning trigonometric ratio is handled, and carries out the unit node information after step 310 output is handled then, enter step 311 afterwards counter is added 1, get back to step 304.Otherwise enter step 309, the output unit node information.Enter step 311 then counter is added 1, get back to step 304.
Extract solid element surface mesh and trigonometric ratio process flow steps as shown in Figure 4, at first judge whether to exist solid element, if there is no, then enter and withdraw from step 405, need not extract surface mesh by step 401; If exist, enter step 402, need to select the solid element of extraction; Enter step 403 afterwards, get solid element and count Nt, making I=1(I is a counter, when being I=Nt after all plate shell units are all handled, finish processing), enter step 404, judge whether counter equals Nt, judging whether that promptly all solid elements all dispose, is then to enter step 405, finishes the solid element grid and extracts flow process.Otherwise enter step 406, extract I solid element, enter step 407, extract the outside surface of this solid element and count Ns, enter step 408, counter J=1 judges whether J is this solid element outside surface number, is counter I+1 then, carry out step 404.Otherwise enter step 409, select all unit nodes on J surface, the unit node that enters step 410 pair J surface is arranged reorganization, enters step 411 output unit node information then.Then counter J is added 1, get back to step 407, judge whether to need to handle I+1 unit.
Wherein, the flow process of extraction outside surface unit is at first carried out step 501 and is got solid element information as shown in Figure 5; Carry out step 502 then to each body unit, get its surface information; Then carry out step 503, judge whether each face only is present on the solid element and (as tetrahedron element 4 faces is arranged, hexahedral element has 6 faces), if not, execution in step 505, show that then this face is the outside surface of unit, preserve this face unit, execution in step 506 is judged next solid element then. If execution in step 504 shows that then this face is the inside surface of unit, directly deletion, execution in step 506 is judged next solid element then.Handle whole body units like this, can obtain the outside surface unit information of an entity structure.
Wherein, the idiographic flow that trigonometric ratio is handled for face unit (plate shell unit), if the face unit is the gore unit, then directly extracts as shown in Figure 6; If have the quadrilateral surface unit on the face unit, be divided into two triangles to a quadrilateral.Should notice that two triangles that are divided into can not overlap this moment.As shown in Figure 6, four nodes 1,2,3,4 of quadrilateral mesh, Fig. 6 (b) is divided into two triangles with this quadrilateral, can be 3,1 line subdivision, also can 2,4 line subdivisions.
Fig. 6 (d), Fig. 6 (e) are the parts of two triangular mesh obtaining by 3,1 line subdivision and 2,4 line subdivisions.
This partition patterns of Fig. 6 (c) not only overlaps mutually but also also has area to lose, and is wrong disposal route.
After the unit of cabinet and node are handled,, write as corresponding model file, imported in the analysis software, promptly finished the conversion of distressed structure grid according to the form that different software requires.
In order to verify the validity of above-mentioned grid conversion method, be example with certain high density electronic equipment chassis, check this method.Shown in Fig. 7 (a, b, c).After importing electromagnetism and temperature analysis software, according to the analysis requirement of subject separately, further divide analysis grid separately on this basis, for example emi analysis need be according to the frequency tessellated mesh, temperature analysis then will continue to divide hexahedral mesh on the basis that imports tri patch, and air also needs to divide grid.Material properties is set at last, and boundary condition and various excitation can begin analytical calculation.The technology of this respect is exceeded explanation owing to be existing technology in the instructions of the present invention, and care person can be with reference to more professional technical information.Fig. 7 a Fig. 7 b, Fig. 7 c among Fig. 7 introduces synoptic diagram for the present invention will be described, do not represent entity of the present invention, use only for referencial use.
Problems such as certainly, divide grid importing on the basis of grid, divide grid with respect to direct modeling, owing to consider more deformation information, it is relatively poor to certainly exist mesh quality, and perhaps number of grid is more, this is the deficiency that coupling analysis brings.
Claims (8)
1. the grid conversion method in the multidisciplinary optimal design, its method feature is: it is finished as follows:
1) at first the Parametric CAD solid model is imported to and carry out structure analysis in the Structural Analysis Model;
2) after structure analysis is finished, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes;
3) the structured grid file is input to heat analysis grid and emi analysis grid and carries out heat and emi analysis.
2. the grid conversion method in the multidisciplinary optimal design according to claim 1, its method feature is: described Structural Analysis Model is carried out structure analysis, need to extract plate shell surface mesh and trigonometric ratio processing and solid element surface mesh and trigonometric ratio processing in the Structural Analysis Model, need be according to the processing of classifying of the cell type of Structural Analysis Model, the face unit of two dimension to classification, judge whether it is triangular element, be, then direct extraction unit information, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes; Be not, carry out trigonometric ratio earlier and handle that the back is extraction unit information directly, output contains the structured grid file of coordinate, displacement and the unit information of whole nodes; To the solid element of three-dimensional of classification, then need earlier internal element is removed in the complanation of hypostazation unit, extract the outside surface unit, the outer surface unit uses the processing procedure of two-dimensional surface unit then; Unit after will handling at last is combination number again, is write as the file layout that FEKO and ICEPAK can discern.
3. the grid conversion method in the multidisciplinary optimal design according to claim 2, its method feature is: plate shell surface mesh and trigonometric ratio process flow steps in the described extraction Structural Analysis Model are, at first judge whether to exist the plate shell unit by step 301, if there is no, then enter and withdraw from step 305, need not extract surface mesh; If exist, enter step 302, need to select the plate shell face of extraction; Enter step 303 afterwards, get plate shell face and count Nb, making I=1(I is a counter, when being I=Nb after all plate shell units are all handled, finish processing), enter step 304, judge whether counter equals Nb, judging whether that promptly all plate shell units all dispose, is then to enter step 305, finishes plate shell unit grid and extracts flow process; Otherwise enter step 306, extract I plate shell unit, enter step 307, judge whether I unit is quadrilateral units, be then carry out step 308, the beginning trigonometric ratio is handled, and carries out the unit node information after step 310 output is handled then, enter step 311 afterwards counter is added 1, get back to step 304; Otherwise enter step 309, the output unit node information; Enter step 311 then counter is added 1, get back to step 304.
4. the grid conversion method in the multidisciplinary optimal design according to claim 2, its method feature is: described extraction solid element surface mesh and trigonometric ratio process flow steps are: at first judge whether to exist solid element by step 401, if there is no, then enter and withdraw from step 405, need not extract surface mesh; If exist, enter step 402, need to select the solid element of extraction; Enter step 403 afterwards, get solid element and count Nt, making I=1(I is a counter, when being I=Nt after all plate shell units are all handled, finish processing), enter step 404, judge whether counter equals Nt, judging whether that promptly all solid elements all dispose, is then to enter step 405, finishes the solid element grid and extracts flow process; Otherwise enter step 406, extract I solid element, enter step 407, extract the outside surface of this solid element and count Ns, enter step 408, counter J=1 judges whether J is this solid element outside surface number, is counter I+1 then, carry out step 404; Otherwise enter step 409, select all unit nodes on J surface, the unit node that enters step 410 pair J surface is arranged reorganization, enters step 411 output unit node information then; Then counter J is added 1, get back to step 407, judge whether to need to handle I+1 unit.
5. the grid conversion method in the multidisciplinary optimal design according to claim 4, its method feature is: the flow process of described extraction outside surface unit is at first to carry out step 501 and get solid element information; Carry out step 502 then to each body unit, get its surface information; Then carry out step 503, judge whether each face only is present on the solid element, if not, execution in step 505 shows that then this face is the outside surface of unit, preserves this face unit, execution in step 506 is judged next solid element then; If execution in step 504 shows that then this face is the inside surface of unit, directly deletion, execution in step 506 is judged next solid element then; Handle whole body units like this, can obtain the outside surface unit information of an entity structure.
6. the grid conversion method in the multidisciplinary optimal design according to claim 2, its method feature is: there is the quadrilateral surface unit in described wherein trigonometric ratio in handling, and be divided into two triangles to a quadrilateral, and two triangles can not overlap.
7. the grid conversion method in the multidisciplinary optimal design according to claim 1, its method feature is: described emi analysis need be according to the frequency tessellated mesh.
8. the grid conversion method in the multidisciplinary optimal design according to claim 1, its method feature is: described temperature analysis will continue to divide hexahedral mesh on the basis that imports tri patch, and air is also needed to divide grid; Material properties is set at last, and boundary condition and various excitation can begin analytical calculation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279586A (en) * | 2013-01-25 | 2013-09-04 | 北京空间飞行器总体设计部 | Method for quadratic mapping of finite element temperature field |
| CN103322955A (en) * | 2013-06-09 | 2013-09-25 | 西安电子科技大学 | Method for reversely solving position and area of chip single heat source |
| CN106126788A (en) * | 2016-06-17 | 2016-11-16 | 中国电子科技集团公司第十研究所 | Antenna mechanical-electric coupling method based on grid transmission |
| CN107918696A (en) * | 2017-10-20 | 2018-04-17 | 西安电子科技大学 | The multi- scenarios method analysis method and computer program of phased array antenna |
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2010
- 2010-12-24 CN CN2010106046284A patent/CN102063532A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279586A (en) * | 2013-01-25 | 2013-09-04 | 北京空间飞行器总体设计部 | Method for quadratic mapping of finite element temperature field |
| CN103279586B (en) * | 2013-01-25 | 2016-02-10 | 北京空间飞行器总体设计部 | A kind of Quadratic Map method of finite element temperature field |
| CN103322955A (en) * | 2013-06-09 | 2013-09-25 | 西安电子科技大学 | Method for reversely solving position and area of chip single heat source |
| CN103322955B (en) * | 2013-06-09 | 2015-11-18 | 西安电子科技大学 | A kind of method oppositely solving chip single heat source position and area |
| CN106126788A (en) * | 2016-06-17 | 2016-11-16 | 中国电子科技集团公司第十研究所 | Antenna mechanical-electric coupling method based on grid transmission |
| CN107918696A (en) * | 2017-10-20 | 2018-04-17 | 西安电子科技大学 | The multi- scenarios method analysis method and computer program of phased array antenna |
| CN107918696B (en) * | 2017-10-20 | 2021-05-11 | 西安电子科技大学 | Multi-field coupling analysis method for phased array antenna and computer program |
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Application publication date: 20110518 |