CN103984827A - MSC.simxpert-based method for performing finite element analysis upon space launch vehicle - Google Patents
MSC.simxpert-based method for performing finite element analysis upon space launch vehicle Download PDFInfo
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- CN103984827A CN103984827A CN201410217020.4A CN201410217020A CN103984827A CN 103984827 A CN103984827 A CN 103984827A CN 201410217020 A CN201410217020 A CN 201410217020A CN 103984827 A CN103984827 A CN 103984827A
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Abstract
The invention discloses an MSC.simxpert-based method for performing finite element analysis upon a space launch vehicle. The method comprises the steps of: establishing a ProE model of a structure of the space launch vehicle; reading the ProE model in the MSC.simxpert so as to form a simxpert characteristic model; identifying geographical characteristics in the simxpert characteristic model according to geographical key words of characteristics and generating a simxpert geographical model; establishing a finite element model on a basis of the simxpert geographical model, the finite element model comprising an entity unit, a hull unit and a beam unit; identifying a material attribute in the simxpert characteristic model according to attribute names in a characteristic name so as to obtain material attribute information; searching, in a read-in material attribute database in an XML file format, for a unit attribute corresponding to each geographical characteristic according to the material attribute information, and assigning the attribute for the finite element model according to the found unit attributes. According to the MSC.simxpert-based method for performing finite element analysis upon the space launch vehicle disclosed by the invention, through effective combination of CAD and CAE, finite element modelling and analyzing efficiencies can be effectively improved.
Description
Technical field
The invention belongs to structural finite element analysis field, be specifically related to a kind of method of space launch vehicle being carried out to finite element analysis based on MSC.simxpert (MSC company).
Background technology
Novel space launch vehicle structure not only load is complicated, complex structure, and use in a large number new material, so the design difficulty of novel space launch vehicle structure and complexity are all far above model in the past, the lead time that is difficult to meet new model structural system according to the serial development flow process of " first design, post analysis, test again " in the past requires and structural behaviour requirement, therefore, must in structural design, carry out structure analysis and Optimization Work, adopt a large amount of simulation analysis to replace verification experimental verification.And restriction structure simulation analysis speed and the topmost workload of efficiency are the foundation of simulation analysis model.The structure finite element imitation analytical model of conventional is all directly to set up in finite element software; because the pre-treatment modeling function of finite element software is far short of what is expected compared with the modeling function of commercial CAD software; not only modeling efficiency is low for this Direct Modeling mode; and easily make mistakes; the modeling custom that adds everyone is different; cause the versatility of model not strong, and because modeling process does not have unified standard, cause also often there will be problem when assembling conjunctive model.
Summary of the invention
Technical matters to be solved by this invention is: for existing structure finite element simulation, calculate field, the problem that finite element model modeling efficiency is low, model commonality is not strong, a kind of method of finite element analysis of space launch vehicle being carried out based on MSC.simxpert has been proposed, by the effective combination of CAD, CAE, can effectively improve the efficiency of finite element modeling and analysis.
The present invention includes following technical scheme:
Based on MSC.simxpert, space launch vehicle is carried out a method for finite element analysis, comprise the steps:
(1) set up the ProE model of space launch vehicle structure, described ProE model comprises curved surface features, curvilinear characteristic and substance feature, and each feature title is comprised of how much key words, size key word, serial number and attribute-name;
(2) at MSC.simxpert, read in described ProE model and form simxpert characteristic model, read in the material properties storehouse of XML file layout;
(3) according to how much key words of feature, the geometric properties in described simxpert characteristic model is identified and generated simxpert geometric model, based on simxpert geometric model, set up finite element model; Described finite element model comprises solid element, shell unit and beam element;
(4) according to the attribute-name in feature title, the material properties in described simxpert characteristic model is identified to the material properties information that obtains; According to described material properties information, from the material properties storehouse of the XML file layout of reading in, search the cell attribute that each geometric properties is corresponding, and be finite element model ascription according to the cell attribute of searching, wherein cell attribute comprises material, thickness and cross section information;
(5) utilize the finite element model of setting up to carry out finite element analysis.
Whether how much key words by judging characteristic are all entities in " V " traversal simxpert characteristic model, if entity associated entity curve, and by the size key word of identification entity, divide feature entity grid, generate solid element; Whether how much key words by judging characteristic are all curved surfaces in " S " traversal simxpert characteristic model, if curved surface is found the affiliated characteristic surface of curve, linked character curved surface and characteristic curve, and by identification size key word, divide surface mesh, obtain shell unit; Whether how much key words by judging characteristic are all curves in " B " traversal simxpert characteristic model, if curve, using this curve as seed line, by identification size key word, this curve is spread to Seed Points, divide characteristic curve grid, obtain beam element.
The present invention compared with prior art tool has the following advantages:
The present invention is the advantage with CAE software (MSC.simxpert) in conjunction with CAD software (ProE), use the powerful modeling function of CAD software as the pre-treatment of finite element software, so not only improved the efficiency of modeling, also improve the versatility of finite element model, finally realized quick, the efficient object of developing of space launch vehicle structure.
Accompanying drawing explanation
Fig. 1 the present invention is based on MSC.simxpert space launch vehicle to be carried out to the method flow diagram of finite element analysis.
Fig. 2 is for to identify the geometric properties in simxpert characteristic model, and sets up the process flow diagram of finite element model.
Fig. 3 is the hood PROE illustraton of model of setting up based on this method.
Fig. 4 is the hood finite element model figure setting up based on this method.
Embodiment
Below just by reference to the accompanying drawings the present invention is described further.
As shown in Figure 1, the method for finite element analysis of space launch vehicle being carried out based on MSC.simxpert of the present invention, comprises the steps:
(1) set up the ProE model of space launch vehicle structure, described ProE model comprises curved surface features, curvilinear characteristic and substance feature.
For the feature in ProE model is identified by SimXpert template, feature in ProE model need to be named according to certain Naming conventions, ProE feature title is comprised of how much key words, size key word, serial number, attribute-name four parts, for example:
1) curved surface features called after S_XXX_N_###, wherein S is how much key words, and representation feature is shell, will be divided into plate shell unit or laminate unit in finite element model, XXX is the size key word of this curved surface, the size of mesh opening that size key word comprises this curved surface finite element model; N is the serial number of curved surface, has the different curve (different features can not be born the same name in ProE) of same alike result name in order to difference in ProE model; ### is the attribute-name of this curved surface, as long as the identical curved surface of attribute-name all has identical attribute in CAE model.For example: curved surface features called after a: S_FS100_E14_SP-JC5, represent that this is characterized as curved surface, size of mesh opening is 100, and serial number is E14, and attribute is called SP-JC5.
2) for curvilinear characteristic in model, will be divided into the curvilinear characteristic called after B_XXX_N_### of beam element, wherein B is how much key words, represents that this is characterized as beam, in finite element model, will be confirmed as beam element; XXX is the size key word of this curve, the number of grid that size key word comprises this curve finite element model; N is ProE serial number, has the different curves (different features can not be born the same name in ProE) of same alike result name in order to difference in ProE model; ### is the attribute-name of this curve.For example, the called after of a curvilinear characteristic: B_FN20_k13_BP-kg, represents that this is characterized as curve, and the grid number on this curve is 20, and serial number is k13, and attribute is called BP-kg
3) for the substance feature in model, by substance feature called after V_XXX_N_###, wherein V is how much key words, representation feature is entity, in finite element model, will be divided into solid element, XXX is the size key word of this entity, the size of mesh opening that size key word comprises this entity finite element model; N is ProE serial number; ### is the attribute-name of this entity.For example, the called after of a substance feature: V_FV30_g13_VP-dk, represents that this is characterized as entity, and the size of mesh opening on this entity is 30, and serial number is g13, and attribute is called VP-dk.
(2) at MSC.simxpert, read in described ProE model and form corresponding with it simxpert characteristic model, read in the material properties storehouse of XML file layout.
(3) according to how much key words of feature, the geometric properties in described simxpert characteristic model is identified and generated simxpert geometric model, based on simxpert geometric model, set up finite element model.Described finite element model comprises solid element, shell unit and beam element.
As shown in Figure 2, the geometric properties in described simxpert characteristic model is identified and generated simxpert geometric model, and it is as follows to set up the step of finite element model:
Whether how much key words by judging characteristic are all entities in " V " traversal simxpert characteristic model, if entity associated entity curve, and by the size key word of identification entity, divide feature entity grid, generate solid element; Whether how much key words by judging characteristic are all curved surfaces in " S " traversal simxpert characteristic model, if curved surface is found the affiliated characteristic surface of curve, linked character curved surface and characteristic curve, and by identification size key word, divide surface mesh, obtain shell unit; Whether how much key words by judging characteristic are all curves in " B " traversal simxpert characteristic model, if curve, using this curve as seed line, by identification size key word, this curve is spread to Seed Points, divide characteristic curve grid, obtain beam element.
(4) according to the attribute-name of feature, the material properties in described simxpert characteristic model is identified to the material properties information that obtains; According to described material properties information, from the material properties storehouse of the XML file layout of reading in, search the cell attribute that each geological information is corresponding, and be finite element model ascription according to cell attribute corresponding to each geological information of searching.Wherein cell attribute comprises material, thickness and cross section information.
(5) utilize the finite element model of setting up to carry out finite element analysis.
Be illustrated in figure 3 the ProE model of the space launch vehicle hood of foundation, the finite element model that Fig. 4 is hood.
The content that the present invention does not introduce in detail belongs to general knowledge known in this field.
Claims (2)
1. based on MSC.simxpert, space launch vehicle is carried out a method for finite element analysis, it is characterized in that, comprise the steps:
(1) set up the ProE model of space launch vehicle structure, described ProE model comprises curved surface features, curvilinear characteristic and substance feature, and each feature title is comprised of how much key words, size key word, serial number and attribute-name;
(2) at MSC.simxpert, read in described ProE model and form simxpert characteristic model, read in the material properties storehouse of XML file layout;
(3) according to how much key words of feature, the geometric properties in described simxpert characteristic model is identified and generated simxpert geometric model, based on simxpert geometric model, set up finite element model; Described finite element model comprises solid element, shell unit and beam element;
(4) according to the attribute-name in feature title, the material properties in described simxpert characteristic model is identified to the material properties information that obtains; According to described material properties information, from the material properties storehouse of the XML file layout of reading in, search the cell attribute that each geometric properties is corresponding, and be finite element model ascription according to the cell attribute of searching, wherein cell attribute comprises material, thickness and cross section information;
(5) utilize the finite element model of setting up to carry out finite element analysis.
2. a kind of method of finite element analysis of space launch vehicle being carried out based on MSC.simxpert according to claim 1, it is characterized in that, described step (3) specifically comprises the steps: whether how much key words by judging characteristic are all entities in " V " traversal simxpert characteristic model, if entity associated entity curve, and by the size key word of identification entity, divide feature entity grid, generate solid element; Whether how much key words by judging characteristic are all curved surfaces in " S " traversal simxpert characteristic model, if curved surface is found the affiliated characteristic surface of curve, linked character curved surface and characteristic curve, and by identification size key word, divide surface mesh, obtain shell unit; Whether how much key words by judging characteristic are all curves in " B " traversal simxpert characteristic model, if curve, using this curve as seed line, by identification size key word, this curve is spread to Seed Points, divide characteristic curve grid, obtain beam element.
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Cited By (1)
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| CN109190239A (en) * | 2018-08-29 | 2019-01-11 | 中铁九局集团第六工程有限公司 | The method that available railway curve establishes line midline model in CIVIL3D |
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| CN103593518A (en) * | 2013-10-31 | 2014-02-19 | 中国运载火箭技术研究院 | Aircraft model modification system based on modal test data |
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| CN103593518A (en) * | 2013-10-31 | 2014-02-19 | 中国运载火箭技术研究院 | Aircraft model modification system based on modal test data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109190239A (en) * | 2018-08-29 | 2019-01-11 | 中铁九局集团第六工程有限公司 | The method that available railway curve establishes line midline model in CIVIL3D |
| CN109190239B (en) * | 2018-08-29 | 2022-12-09 | 中铁九局集团第六工程有限公司 | Method for establishing line neutral model in CIVIL3D by existing curve |
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