CN101281659B - Method for modeling finite element of multi-frame integral structure component - Google Patents
Method for modeling finite element of multi-frame integral structure component Download PDFInfo
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Abstract
The invention discloses a finite element modeling method of the polybox integral structure aiming at the status that the method of building the polybox structural member finite element model has bad accuracy, low precision, large time and energy consumption and depends on the experienced analyzer. The method includes the steps: through initiatively simplifying the polybox structural member three-dimensional CAD model, extracting the frame tag architecture, building the finite element model base according to the frame tag architecture, then according to the actual form of the polybox structural member transmitting from the single frame to the multi-frame through transforming the working surface, forming the polybox structural member by dynamically splicing the single frame structural member, finally determining the polybox structural member finite element model. The method has the characteristics of high accuracy and good interactivity, which effectively shortens the modeling period of the finite element, not only embodies the computational mechanics theory of the polybox structural member, also makes the finite element model accurate than the CAD model in geometry.
Description
Technical field
The present invention relates to a kind of finite element method of many frames integral structure component, the modeling method before the integrally-built finite element analysis of especially a kind of many frames, specifically a kind of finite element modeling method of many frames integral structure component.
Background technology
Along with the development of aircraft industry, the performance requirement of present generation aircraft improves constantly, and bigger variation has taken place the structural design of aircraft.From design of part, for weight reduction, integral structure component has obtained application as much as possible in new architecture, as wing, integral panel, crossbeam, bulkhead etc.Many frames integral structure component is not to be formed by the part simple combination, but utilizes integral workblank to process.Because many frames integral structure component has smooth in appearance, lightweight characteristics, all win at aspects such as rigidity, fatigue resistance and various unstability critical values and one to raise than riveted structure, therefore the main load-carrying construction spare of conduct on Aerospace Products has obtained using widely.Because many frames of aviation integral structure component generally have complex structure, thin-walled, thickening degree, curved surface curvilinear structures many, coordinate accuracy requirement than characteristics such as height, all adopt the method for numerical control milling to process at present.But in the middle of Milling Processes,, be easy to deform, therefore be badly in need of its deformation rule is carried out Computer Analysis owing to multiple reasons such as cutting force, heat in metal cutting, detail rigidity differences.
Many frames integral structure component Milling Process deformation rule is summarized, need lot of data.If come the cumulative data cost too high by test fully.In order to address this problem, people have expected the method for utilizing finite element to analyze.And the crucial prerequisite of utilizing the finite element analysis technology successfully to find the solution many frames integral structure component Milling Process deformation rule is to set up accurately rational many frames integral structure component finite element model.But utilize finite element software and CAD software interface directly to introduce many frames integral structure component cad model, often cause the variation of model and produce too much huge node number, to such an extent as to missing data influences the accuracy and the precision of finite element analysis.Require a great deal of time and energy and directly utilize finite element software to set up many frames integral structure component finite element model, and the process of this finite element model abstract depends on experienced analyst to a great extent.Therefore, propose initiatively, parametric modeling method becomes inevitable fast and accurately at many frames integral structure component finite element.In modeling process, it is initiatively simplified according to many frames integral structure component unique characteristics, seek the rule of modeling, it can effectively shorten the finite element modeling cycle, can embody the Computational Mechanics theory of many frames integral structure component, also make finite element model on how much more accurately in cad model.
Summary of the invention
The objective of the invention is the method poor accuracy of setting up many frames integral structure component finite element model at existing, precision is low, expend a large amount of time and efforts, and rely on experienced analyst's present situation, invention a kind of by to the ANSYS secondary development, based on " framework splicing " modeling realize the active of many frames integral structure component, parametrization is set up the finite element modeling method of many frames integral structure component of finite element model fast and accurately.
Technical scheme of the present invention is:
A kind of finite element modeling method of many frames integral structure component, it mainly may further comprise the steps its feature and is:
The first step is simplified frame structure, extracts feature structure;
According to the three-dimensional CAD model of many frames integral structure component, each framework of forming many frames integral structure component initiatively is simplified to the feature structure of three frames or four frames; Described three frame feature structures are to have three frames of triangle character or be that on one side the Qu Biansan frame on bent limit, described four frame feature structures are to have four frames of quadrilateral feature or be the Qu Biansi frame on bent limit on one side;
Second goes on foot, and sets up the finite element model storehouse of feature structure in computing machine;
According to the feature structure of the gained of the first step, adopt the SHELL181 shell unit to set up corresponding three frame finite element models and/or four frame finite element models; Geometric parameter and the cell parameters that the model of being built is imported this model by interactive mode generates automatically simultaneously; The geometric parameter of model is meant length, width, height and the key point coordinate of simplifying framework; For providing multiple interactive input method, the finite element model of being built defines its geometric parameter simultaneously, the user can provide according to many frames integral structure component three-dimensional CAD model each simplify the related data of framework, select the geometric configuration that the easiest input method is determined this framework;
The 3rd step, utilize the feature structure of being built to splice, until obtaining the splicing entity that a circumference and many frames integral structure component three-dimensional CAD model match, finite element model with each splicing entity converts the APDL macro document to again, be deposited under the ANSYS working directory, under the ANSYS runnable interface, call the finite element model that this macro document can directly generate many frames integral structure component.
Described three frame feature structures are made of three sides and a bottom surface, and four frame feature structures are made of four sides and a bottom surface.
Beneficial effect of the present invention:
The invention solves and utilize finite element software and CAD software interface directly to introduce many frames integral structure component cad model, often cause the variation of model and produce too huge node number, to such an extent as to missing data influences the accuracy of finite element analysis and the problem of precision; Solved and directly utilized finite element software to set up many frames integral structure component finite element model must to spend a large amount of time and efforts, and the process of this finite element model abstract depends on experienced analyst's problem to a great extent.By to the ANSYS secondary development, set up many frames integral structure component finite element model based on " framework splicing " modeling, in modeling process, it is initiatively simplified according to many frames integral structure component unique characteristics, seek the rule of modeling, it can effectively shorten the finite element modeling cycle, can embody the Computational Mechanics theory of many frames integral structure component, also make finite element model on how much more accurately in cad model, realized initiatively, parametrization is set up many frames integral structure component finite element model fast and accurately.
Description of drawings
Fig. 1 is many frames integral structure component finite element modeling software architecture diagram of the present invention.
Fig. 2 is many frames integral structure component finite element modeling software flow block diagram of the present invention.
Fig. 3 is the synoptic diagram of the feature structure after the simplification of the present invention.
Fig. 4 is the structural representation of a concrete part of modeling method processing of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1～4.
A kind of finite element modeling method of many frames integral structure component, it mainly may further comprise the steps and is:
The first step is simplified frame structure, extracts feature structure;
According to the three-dimensional CAD model of many frames integral structure component, each framework of forming many frames integral structure component initiatively is simplified to the feature structure of three frames or four frames; Described three frame feature structures are to have three frames of triangle character or be that on one side the Qu Biansan frame on bent limit, described four frame feature structures are to have four frames of quadrilateral feature or be the Qu Biansi frame on bent limit on one side; As Fig. 3 institute method.
Second goes on foot, and sets up the finite element model storehouse of feature structure in computing machine;
According to the feature structure of the gained of the first step, adopt the SHELL181 shell unit to set up corresponding three frame finite element models and/or four frame finite element models; Geometric parameter and the cell parameters that the model of being built is imported this model by interactive mode generates automatically simultaneously; The geometric parameter of model is meant length, width, height and the key point coordinate of simplifying framework; For providing multiple interactive input method, the finite element model of being built defines its geometric parameter simultaneously, the user can provide according to many frames integral structure component three-dimensional CAD model each simplify the related data of framework, select the geometric configuration that the easiest input method is determined this framework; Described three frame feature structures are made of three sides and a bottom surface, and four frame feature structures are made of four sides and a bottom surface.
The 3rd step, utilize the feature structure of being built to splice, until being spliced to form the cad model that matches with many frames integral structure component circumference, as shown in Figure 4, described many frames integral structure component has two three frames, a band Qu Biansan frame, one four frame, a band Qu Biansi frame combines, can obtain the finite element model of many frames integral structure component of combining by feature structure thus and convert thereof into the APDL macro document, be deposited under the ANSYS working directory, under the ANSYS runnable interface, call the finite element model that this macro document directly generates many frames integral structure component.
Be further described below in conjunction with an example:
The present invention can realize that they are by four modules: (1) modeling rendering module, (2) models show module, (3) data conversion module, (4) system management module.Wherein the modeling rendering module comprises that working face conversion and model bank set up two parts.The working face conversion can realize functions such as working face translation, working face rotation and origin inquiry; Model bank is set up and have been comprised that parametrization sets up the method for finite element models such as three frames, Qu Biansan frame, four frames and Qu Biansi frame.Functions such as the models show module can be implemented in that model sketch under the VC++ interface is browsed, model sketch convergent-divergent, the translation of model sketch and screen coordinate demonstration.Data conversion module can realize that the many frames integral structure component that will finally determine converts the APDL macro document to, and can realize checking and revising this macro document.Software management module can realize that user cipher management, software version show and help document such as checks at function.
The user is operating software under Windows 2000/xp environment.What at first show is the software log-in interface.The software log-in interface has comprised software version information and production unit's information.User's success Input Software password can change running software master interface automatically over to, otherwise lack of competence is moved this software.
After entering running software master interface, the user selects the type of framework from the model bank toolbar, different framework types provides different interactive input method input model parameters, the user can be according to the correlation parameter of example input model, and clicking the framework finite element model sketch of setting up after " determining " button can show at graphical display window.
Determine after the finite element model of single framework,,, continue to determine the finite element model of next framework according to above-mentioned steps by the conversion working face according to the true form of many frames integral structure component.
By repeating above-mentioned steps, can finally determine many frames integral structure component finite element model.By clicking " generating the APDL file " button on the main interface, eject and generate the APDL FileDialog, select the working directory of ANSYS, after input ANSYS work name and the title, click " derivation " button on the dialog box, will generate many frames integral structure component finite element model APDL macro document APDLFile.mac automatically and be kept under the working directory of ANSYS.The user can inquire about and revise this macro document as required.Under the ANSYS runnable interface, call this macro document and can directly generate many frames integral structure component finite element model.
Fig. 3 and Fig. 4 are respectively many frames integral structure component finite element model sketch that utilizes this method foundation and many frameworks integral structure component finite element model of setting up by the macro document that calls this method generation under the ANSYS10.0 interface.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (1)
1. the finite element modeling method of frame integral structure component more than a kind is characterized in that:
Mainly may further comprise the steps:
The first step is simplified frame structure, extracts feature structure;
Three-dimensional CAD model according to many frames integral structure component, each framework of forming many frames integral structure component initiatively is simplified to three frames or four frame feature structures, described three frame feature structures are made of with all vertical bottom surface, three sides with one three sides, and described three frame feature structures are to have three frames of triangle character or be the Qu Biansan frame on bent limit on one side; Described four frame feature structures are made of with all vertical bottom surface, four sides with one four sides, and described four frame feature structures are to have four frames of quadrilateral feature or be the Qu Biansi frame on bent limit on one side;
Second goes on foot, and sets up the finite element model storehouse of feature structure in computing machine;
According to the feature structure of the gained of the first step, adopt the SHELL181 shell unit to set up corresponding three frame finite element models and/or four frame finite element models; Geometric parameter and the cell parameters that the model of being built is imported this model by interactive mode generates automatically simultaneously; The geometric parameter of model is meant length, width, height and the key point coordinate of simplifying framework; For providing multiple interactive input method, the finite element model of being built defines its geometric parameter simultaneously, the user can provide according to many frames integral structure component three-dimensional CAD model each simplify the related data of framework, select the geometric configuration that the easiest input method is determined this framework;
The 3rd step, utilize the feature structure of being built to splice, until obtaining the splicing entity that a circumference and many frames integral structure component three-dimensional CAD model match, finite element model with each splicing entity converts the APDL macro document to again, be deposited under the ANSYS working directory, under the ANSYS runnable interface, call the finite element model that this macro document can directly generate many frames integral structure component.
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| CN101923467A (en) * | 2010-08-13 | 2010-12-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for model transmission among CAD (Computer-Aided Design) software, UG (Unigraphics) software and CAE (Computer-Aided Engineering) software |
| CN103177163A (en) * | 2013-04-09 | 2013-06-26 | 常州工学院 | Follow-up forecast method for milling deformation of complex integral structural components |
| CN105739958B (en) * | 2014-12-10 | 2019-02-15 | 中国飞机强度研究所 | A kind of general frame finite element model method for fast establishing |
| CN106354967B (en) * | 2016-09-09 | 2018-07-17 | 北京航空航天大学 | A kind of turbine disc structure Integrated design and analysis method |
| CN110020473A (en) * | 2019-03-29 | 2019-07-16 | 常州市武进广宇花辊机械有限公司 | The servo-actuated prediction technique of hot-rolling mill support construction machining deformation |
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| Title |
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| 郭魂.航空多框整体结构件铣削变形机理与预测分析研究.中国博士学位论文全文数据库(工程科技II辑)2006年 10.2006,2006年(10),C031-8. |
| 郭魂.航空多框整体结构件铣削变形机理与预测分析研究.中国博士学位论文全文数据库(工程科技II辑)2006年 10.2006,2006年(10),C031-8. * |
| 黄志刚,柯映林,董辉跃.框类整体结构件铣削加工顺序的有限元模型.浙江大学学报(工学版)39 3.2005,39(3),368-372. |
| 黄志刚,柯映林,董辉跃.框类整体结构件铣削加工顺序的有限元模型.浙江大学学报(工学版)39 3.2005,39(3),368-372. * |
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