CN102222121A - Finite element modeling method for modal simulation - Google Patents
Finite element modeling method for modal simulation Download PDFInfo
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- CN102222121A CN102222121A CN 201010145169 CN201010145169A CN102222121A CN 102222121 A CN102222121 A CN 102222121A CN 201010145169 CN201010145169 CN 201010145169 CN 201010145169 A CN201010145169 A CN 201010145169A CN 102222121 A CN102222121 A CN 102222121A
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Abstract
The invention discloses a finite element modeling method for modal simulation, which comprises the following steps of: importing a grid model of an object to be analyzed; checking the integrity of the grid model; establishing connection between components; establishing attribute cards and material cards of the components; establishing modal calculation conditions; and exporting the grid model processed by the steps. By the method, analysts, engineers, and even people who do not know the finite element modeling method can quickly establish an analysis model to calculate and check results, the quality of the analysis model is improved, and errors are reduced.
Description
Technical field
The present invention relates to computer-aided engineering and software technology field, relate in particular to a kind of finite element modeling method that is used for the emulation of automotive trim mode.
Background technology
The natural frequency of automotive trim is as its inherent characteristic, and its height has significant effects to the NVH performance of car load, not only influences the vibration durability energy of interior trim, and the noise control of car load is also had bigger influence.In the middle of the process of automotive trim exploitation, the method for emulation that often uses a computer is found the solution the natural frequency of automotive trim, just so-called mode emulation.
In the mode simulation process, we not only pay close attention to the accuracy of emulation, but also pay close attention to the efficient of emulation.The accuracy of emulation depends on the accuracy of model; automotive trim is the system of a relative complex, in modeling process, material parameter occurs through regular meeting; mistakes such as thickness information and inner connection, these mistakes may cause the distortion of final mode simulation result.On the other hand, the foundation of realistic model, all be to use business software to wait and realize that these business softwares all are the general pre-processing softwares that is applicable to different industries, and be not directed to the demand of particular analysis specially as Altair HyperMesh, ANSA, only rely on its original function, often caused realistic model to set up inefficiency, such as definition thickness, the definition connection waits and can only carry out with manual mode, not only make mistakes easily, and repeated workload is huge.
Summary of the invention
Technical matters to be solved by this invention provides a kind of finite element modeling method that is used for mode emulation, makes analyst, slip-stick artist set up analytical model fast, calculates and check the result, and improves the analytical model quality, reduces wrong generation.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of finite element modeling method that is used for mode emulation may further comprise the steps:
(1) step of the file of the grid model of importing object to be analyzed, described grid model is made up of grid cell, and described file is the include file, and comprises the assembly of described grid model and the assembly under this assembly;
(2) step of the integrality of the described grid model of inspection;
(3) set up connection between the described assembly;
(4) set up the attribute card and the material cards of described assembly;
(5) set up the step of modal calculation operating mode, in described grid model, add some required parameter cards of modal calculation, and revise the bound and the output order parameter of model analysis output;
(6) derive the grid model of handling through above-mentioned steps.
Wherein, in step (2), will call a configuration file, this configuration file is a text, the concrete path and the title that mainly comprise invoked material database are like this as long as the information of change configuration file just can reach the purpose of calling the different materials database.
The present invention encodes by secondary development, optimizes and carries out flow process, utilizes the mode of configuration can generate the grid model file that is used to calculate, and is that complete face proposes to the computer-aided engineering slip-stick artist.Analyst, slip-stick artist or even can both use the method to set up analytical model fast to the uncomprehending personnel of finite element method calculate and check the result, and improve the analytical model quality, reduce wrong generation.
Description of drawings
Fig. 1 is the inventive method process flow diagram;
Fig. 2 is the interface of calling of the present invention;
Fig. 3 is for checking the process flow diagram of assembly;
Fig. 4 is the process flow diagram of module of connecting;
Fig. 5 is the interface of assembly of connecting;
Fig. 6 is the process flow diagram of assembly of connecting;
Fig. 7 is the interface of newly-built connection.
Embodiment
According to Fig. 1-7, provide preferred embodiment of the present invention, and described in detail below, enable to understand better function of the present invention, characteristics.
The process flow diagram of the finite element modeling method that is used for mode emulation of the present invention calls the interface as shown in Figure 2 as shown in Figure 1.
Based on Altair HyperWorks software architecture and TCL/TK programming language, six functional modules that structure is carried out successively are respectively: import grid model module 1, inspection grid model module 2, the module that connects 3, set up attribute and material cards module 4, set up modal calculation operating mode module 5, derived grid model module 6.
Click " Import Model " button shown in Figure 2, import grid model module 1 with traversal round-robin mode, the path of the grid model of the object to be analyzed that selection will import and file.It is the grid model file of suffix, a corresponding include file with " .dat " that this document is one, the inside includes several assemblies (assembly), each assembly the inside includes several assemblies (component) again, and each assembly the inside is all comprising finite element grid information.Again each file is all imported among the AltairHyperMesh.Can see New BSP Model for Large Scale Meshes after the importing by HyperMesh Include Browser.
Grid model is clicked " Check Model " button shown in Figure 2 after importing and finishing, and inspection grid model module 2 can be checked the integrality of grid model, checks promptly whether grid model meets Naming conventions.In conjunction with Fig. 3, the particular exam process is, at each assembly that imports in the finite element grid model, read the name of this assembly earlier, and check in the name of this assembly whether thickness information is arranged, whether the method for inspection is to search in the assembly name character string with the string searching function in the TCL language to contain
*P
*(perhaps
*p
*), wherein * is the numeral between the 0-9.If this character string function can find the character that matches, so just show in the name of this assembly and contain thickness information.Former and later two * are not necessarily identical, if
*P
*(
*p
*) be 3P5, represent that then thickness is 3.5.Reexamine in the name of the assembly under this assembly and whether contain material information, the method of checking is to call configuration file earlier with load information, this configuration file is a text, the concrete path and the title that mainly comprise invoked material database, like this as long as the information of change configuration file just can reach the purpose of calling the different materials database.Read this configuration file with File Open and function reading in the TCL language, obtain the information of material database.Call material database then, this is to realize that by reading the material database that is stored in the long-range or local directory file layout of database is the csv file form.The field of the material database that reads has Material Code (material number), E (Young modulus), these four fields of PR (Poisson ratio), RHO (density).This that reads four prong material information are stored in the assembly name character string, use the string searching function of TCL language again, search whether contain material number in this character string.If thickness information and material information can both find, so just, comprise that the name of assembly name, assembly numbering (ID), component thickness information, assembly material information, assembly material numbering, assembly quality, the affiliated assembly of assembly, the numbering of the affiliated assembly of assembly all output in the outgoing inspection file (csv file) the information of this assembly.If find the grid model defectiveness this moment, can do corresponding change (such change comprises the name of change assembly and assembly) so, and then check grid model.Check that csv file can find out the mistake of grid model form.Common mistake has: do not find attribute, material information, do not find assembly or assembly information etc.
After complete grid model imports, if do not set up coupling assembling or restraint assembly for single grid model, so at this moment can be by the module 3 that connects connect assembly, restraint assembly and connect.The flow process of this module as shown in Figure 4.
The module that connects 3 comprises the assembly submodule 31 that connects.Click " NewConnection Comps " button among Fig. 2, can move this submodule, and eject operation interface as shown in Figure 5.Grid model is made up of grid cell, and common grid cell has 2D quadrilateral units, 2D triangular element etc.The foundation of coupling assembling is according to selected grid cell, find the assembly and assembly under the grid cell after, set up and name connecting assembly and coupling assembling automatically.In order to guarantee the uniqueness of coupling assembling title, comprised the number information of this assembly in the name of coupling assembling.The information that also comprises in the coupling assembling has in addition: the thickness of connection type and linkage unit.In conjunction with Fig. 6, during the operation of this module,, read the name of this coupling assembling before this at each coupling assembling i, adopt character string segmentation function split in the TCL language, read and cut apart the connection type that comprised in the assembly name and the information of number of connection n.With reference to figure 5, connection type just is meant SCREW and the CLIP among SCREW2, SCREW3, CLIP2 and the CLIP3.When cutting apart, just cut apart these two keywords of SCREW and CLIP with the split function.N is exactly the numeral 2 or 3 of back such as SCREW2, SCREW3.According to connection type and number of connection n, adopt the lsearch function in whole grid model, to search for all coupling assemblings, measure this distance between coupling assembling in twos, preserve all range data information in a temporary variable temp, and this range data is carried out size order arrange.If number of connection n is 2, find out so apart from the pairing coupling assembling j of minimum value, coupling assembling i is connected with the 1D unit in the finite element with j.If number of connection n is 3, find out two coupling assembling j and the k apart from minimum so with coupling assembling i, coupling assembling i, j are connected with the 1D unit in the finite element with k.
The module that connects also comprises sets up restraint assembly submodule 32." NewConstraint Comps " button of clicking among Fig. 2 can move this submodule, and ejects similar operation interface as shown in Figure 5.The foundation of restraint assembly is according to selected grid cell, search the assembly and assembly under the grid cell after, set up automatically and name constraints assembly and restraint assembly.The thickness that has comprised number information, constraint degree of freedom and the constraint element of this assembly in the name of restraint assembly.
The module that connects also comprises newly-built connexon module 33.Click " RigidlinksCreation " button shown in Figure 2, can move this submodule, and eject operation interface as shown in Figure 7.After coupling assembling is set up, can finish connection between the coupling assembling by the Auto on the interface (automatically) and two functional modules of Manual (manually).In the time of operation interface, can use Auto (automatically) module to whole grid model earlier, input Tolerance (between the connection apart from tolerance), select Distribution (set up between the assembly link block institute to liking whole model or partial model), according to these information, this Auto submodule just can connect automatically.If some connection is that the Auto submodule is irrealizable, can realize with the Manual submodule, the coupling assembling that select to need connects be connected degree of freedom, according to these input informations, this Manual submodule just can connect accordingly.The Review that occurs in Fig. 7 interface (checking) submodule, its function is to check the coupling assembling that the Buddhist monk that set up does not set up, and the content of checking can be controlled with two sub-options of unrealize (not being connected as yet) by Tolerance (between the connection apart from tolerance).Set up good connection and be kept in the new assembly, the effect of this assembly is exactly to preserve all link informations.Simultaneously, connection is used file puts function and is kept in the local directory after in a single day setting up and having got well, and the file layout of preservation is the CSV form.The present invention has write down following link information in this file: distance between the quantity of the XYZ coordinate of link position, the degree of freedom of connection, connection, the name of coupling assembling and numbering, the coupling assembling and the state that is connected realization.Rebulid afterwards when connecting, the present invention uses file read function and reads this file, and generates link information fast.When connection has been set up, directly read this file with file read function, connect automatically with the Regenerate button among Fig. 7.
Click " Prop ﹠amp among Fig. 2; Mat Card Creation " button, set up attribute and material cards module 4 and can in grid model, add corresponding attribute and material cards.Thickness information in the attribute card is obtained from the name of assembly, cuts apart assembly name character string with character string segmentation function split before this, filters with the method for regular expression and contains
*P
*(perhaps
*p
*) character field, this character field is exactly required thickness information.According to this thickness information, set up attribute card corresponding to this assembly.Obtain the name of the assembly of the material information in the material cards under assembly, the character field of cutting apart the assembly name before this with character string segmentation function split, whether identical with string operation function string equal and this character field of string first matched and searched with Material Code (material number) character string in the material depot, if identical, this character field is exactly required material information so.If different, then in material depot, continue to search.If all do not find all the time, then illustrate in the affiliated assembly name character string of this assembly not include material information.According to this material information, set up material cards corresponding to this assembly.
Click " Modal Analysis (Nast the SOL 103) " button among Fig. 2, can move and set up modal calculation operating mode module 5.Comprise following two submodules: set up the constraint submodule of whole grid model and set up design condition information submodule.The method for building up of constraint submodule is: the name of Read Restriction assembly, cut apart the name character string with the split function, and can obtain retraining the information of degree of freedom.According to retraining the constraint that degree of freedom information is set up grid model.When setting up the constraint of grid model, can use the good restraint assembly of above said foundation, the constraint of setting up grid model according to the information definition of restraint assembly.The method for building up of design condition information submodule is: according to setting up good grid model constraint, the EIGRL and the LOADSTEP information of adding grid model.The function of this module is to add some required parameter cards of modal calculation in grid model, and can eject bound and the output order parameter that an inputting interface is revised model analysis output, the function at this interface makes exactly revises the pairing value of EIGRL card.
After above step is finished, at last in derived grid model module 6, with document form derived grid model.The specific implementation process is: the include file that searching loop is all, in assigned catalogue, derive each include file respectively, and these files are to be the nastran formatted file of suffix name with dat.After circulation finished, deriving one was the nastran master file of suffix name with nas.During the derived grid model, system's folder of can in assigned catalogue, creating a file earlier automatically, setting up one then is the master file of suffix name with nas, wherein related other grid model files under this catalogue.The information of preserving in the master file has: attribute, material, connection and model analysis card.Connect the in store link information of card, and the model analysis card is exactly 5 realizations of modal calculation operating mode module from newly-built connexon module 33.The information of preserving in other grid model files is grid data.
By means of the present invention, people have mode model tissue and computing method more easily, because people only need just can finish the tissue of mode model automatically by several buttons, be convenient to have the slip-stick artist's of the various different structures of knowledge operation, and the mistake due to avoiding neglecting.
Obviously, in the above teachings, may carry out multiple correction and modification, and within the scope of the appended claims, the present invention can be embodied as the specifically described mode that is different from, such as other programming languages of employing and/or based on Other Engineering software to the present invention.
Claims (22)
1. finite element modeling method that is used for mode emulation may further comprise the steps:
(1) file of the grid model of importing object to be analyzed, described grid model is made up of grid cell, and described file is the include file, and comprises the assembly of described grid model and the assembly under this assembly;
(2) integrality of the described grid model of inspection;
(3) set up connection between the described assembly;
(4) set up the attribute card and the material cards of described assembly;
(5) set up the modal calculation operating mode, in described grid model, add some required parameter cards of modal calculation, and revise the bound and the output order parameter of model analysis output;
(6) derive the grid model of handling through above-mentioned steps.
2. finite element modeling method according to claim 1, it is characterized in that, in the step of the file of the grid model of described importing object to be analyzed, in traversal round-robin mode, the described file that selection will import imports to each described file among the Altair HyperMesh again.
3. finite element modeling method according to claim 1 is characterized in that, in the step of the integrality of described inspection grid model, checks the thickness information of the assembly that whether can obtain described grid model and the material information of the assembly under this assembly.
4. according to each described finite element modeling method in the claim 1 to 3, it is characterized in that, in the step of the integrality of described inspection grid model,, carry out following steps at each described assembly:
(4-1) read the name of described assembly, check whether thickness information is arranged in the described name; If do not have thickness information, then redirect (4-3); Otherwise, enter (4-2);
(4-2) whether contain material information in the name of the assembly under the described assembly of inspection:, then enter (4-3) if there is not material information; Otherwise, redirect (4-4);
(4-3) described grid model is changed redirect (4-1);
(4-4) handle component information outputs to an outgoing inspection file, and withdraws from.
5. finite element modeling method according to claim 4 is characterized in that, described step (4-2) comprising:
(5-1) read a configuration file, described configuration file is one and comprises the concrete path of invoked material database and the text of title;
(5-2) call material database, read the field of described material database, and be kept in the assembly name character string;
(5-3) search in the described assembly name character string whether contain material number.
6. finite element modeling method according to claim 4, it is characterized in that described module information comprises the name of assembly name, assembly numbering, component thickness information, assembly material information, assembly material numbering, assembly quality, the affiliated assembly of assembly, the numbering of the affiliated assembly of assembly.
7. finite element modeling method according to claim 5 is characterized in that described field comprises material number, Young modulus, Poisson ratio and density.
8. finite element modeling method according to claim 1 is characterized in that, the described step of connecting of setting up between the described assembly comprises:
(8-1) judge whether coupling assembling is set up: if then read the assembly that comprises link information; Otherwise assembly connects;
(8-2) judge whether restraint assembly is set up: if then enter (8-3); Otherwise, set up restraint assembly earlier, enter (8-3) then;
(8-3) newly-built connection.
9. finite element modeling method according to claim 8 is characterized in that, the step of the described assembly that connects comprises:
(9-1) according to selected described grid cell, search its affiliated assembly and assembly, name connecting assembly and coupling assembling, and guarantee the uniqueness of described coupling assembling title;
(9-2) determine current coupling assembling;
(9-3) read the name of described current coupling assembling, obtain the connection type and the number of connection n that wherein comprise, wherein n is 2 or 3;
(9-4) distance between the described current coupling assembling of measurement and other each coupling assemblings, and preserve this distance;
(9-5) according to described number of connection n, find out n-1 and the coupling assembling of described current coupling assembling, and they are connected with described current coupling assembling respectively with the 1D unit in the finite element apart from minimum;
(9-6) judge whether to travel through all coupling assemblings: if then withdraw from; If not, then with next coupling assembling as current coupling assembling, and redirect (9-3).
10. finite element modeling method according to claim 8 is characterized in that, the described step of setting up restraint assembly comprises according to selected grid cell, searches its affiliated assembly and assembly, sets up automatically and name constraints assembly and restraint assembly.
11. finite element modeling method according to claim 10 is characterized in that, described restraint assembly comprises the thickness of number information, constraint degree of freedom and the constraint element of described assembly in its name after name.
12. finite element modeling method according to claim 8, it is characterized in that, described newly-built step of connecting comprise input between connecting apart from tolerance, and determine to set up connection between the described assembly to as if whole model or partial model, automatically set up the connection between the described coupling assembling.
13. finite element modeling method according to claim 8 is characterized in that, described newly-built step of connecting comprises coupling assembling that selection need connect and is connected degree of freedom, manually sets up the connection between the described coupling assembling.
14. to 13 each described finite element modeling methods, it is characterized in that according to Claim 8 described newly-built step of connecting comprises that the connection that foundation is good is kept in the new assembly to preserve the step of link information.
15. finite element modeling method according to claim 14, it is characterized in that described link information comprises the distance between the name of quantity, coupling assembling of degree of freedom, the connection of XYZ coordinate, the connection of link position and numbering, the coupling assembling and is connected the state of realizing.
16. finite element modeling method according to claim 1 is characterized in that, the described step of setting up attribute and material cards comprises step of adding the attribute card and the step of adding material cards.
17. finite element modeling method according to claim 16 is characterized in that, the step of described interpolation attribute card comprises:
(17-1) from the name of described assembly, obtain thickness information;
(17-2) according to described thickness information, set up attribute card corresponding to described assembly.
18. finite element modeling method according to claim 16 is characterized in that, the step of described interpolation material cards comprises:
(18-1) search the name of the assembly under described assembly with material depot in the identical character field of material number character string, described character field is required material information;
(18-2) according to described material information, set up material cards corresponding to described assembly.
19. finite element modeling method according to claim 1 is characterized in that, the described step of setting up the modal calculation operating mode comprises the step of the constraint of setting up whole model and sets up the step of design condition information.
20. finite element modeling method according to claim 19 is characterized in that, the described step of setting up the constraint of whole model comprises:
(20-1) name of Read Restriction assembly therefrom obtains retraining degree of freedom;
(20-2) according to described constraint degree of freedom, the constraint of setting up model.
21. finite element modeling method according to claim 19 is characterized in that, the described step of setting up design condition information is according to setting up good described constraint, the EIGRL and the LOADSTEP information of adding described grid model.
22. finite element modeling method according to claim 1 is characterized in that, the step of described derived grid model comprises:
(22-1) all described include files of searching loop;
(22-2) in assigned catalogue, derive each described include file respectively;
(22-3) set up a master file, described master file association other grid model files under described catalogue, and the information of preserving in the described master file comprises attribute, material, connection and model analysis card, and the information of preserving in described other grid model files is grid data.
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| CN107169194A (en) * | 2017-05-11 | 2017-09-15 | 常州轻工职业技术学院 | A kind of finite element modeling method of automobile exhaust pipe muffler |
| CN107273558A (en) * | 2016-04-08 | 2017-10-20 | 西门子公司 | The method and apparatus that mechanical performance for threedimensional model is verified |
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| CN105335556A (en) * | 2015-10-21 | 2016-02-17 | 中国电子工程设计院 | Method for controlling grid division density by modal interpolation influence line |
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| CN107273558A (en) * | 2016-04-08 | 2017-10-20 | 西门子公司 | The method and apparatus that mechanical performance for threedimensional model is verified |
| CN106682336A (en) * | 2017-01-03 | 2017-05-17 | 上海波客实业有限公司 | Modeling method for structural finite element model |
| CN107169194B (en) * | 2017-05-11 | 2020-07-07 | 常州轻工职业技术学院 | Finite element modeling method for automobile exhaust pipe silencer |
| CN107169194A (en) * | 2017-05-11 | 2017-09-15 | 常州轻工职业技术学院 | A kind of finite element modeling method of automobile exhaust pipe muffler |
| CN112329280A (en) * | 2019-07-31 | 2021-02-05 | 比亚迪股份有限公司 | Welding spot creating method and device, electronic equipment and storage medium |
| CN112395682A (en) * | 2019-07-31 | 2021-02-23 | 比亚迪股份有限公司 | Cell inheritance method and device of grid model, electronic equipment and storage medium |
| CN110807282A (en) * | 2019-10-31 | 2020-02-18 | 珠海格力智能装备有限公司 | Method and apparatus for defining materials and properties in finite element preprocessing |
| CN110807282B (en) * | 2019-10-31 | 2023-08-04 | 珠海格力智能装备有限公司 | Method and apparatus for defining materials and properties in finite element pre-processing |
| CN111046602A (en) * | 2019-11-27 | 2020-04-21 | 中国第一汽车股份有限公司 | Automobile windshield collision simulation method |
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Application publication date: 20111019 |