CN105739958B - A kind of general frame finite element model method for fast establishing - Google Patents
A kind of general frame finite element model method for fast establishing Download PDFInfo
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- CN105739958B CN105739958B CN201410752819.3A CN201410752819A CN105739958B CN 105739958 B CN105739958 B CN 105739958B CN 201410752819 A CN201410752819 A CN 201410752819A CN 105739958 B CN105739958 B CN 105739958B
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Abstract
The invention belongs to technical field of structural strength, are related to a kind of general frame finite element model method for fast establishing.General frame is reduced to beam form first by this general frame finite element model method for fast establishing, is classified to simplified beam, and the two-end-point coordinate of each beam is provided, and determines intersecting point coordinate between beam and beam and load and constraint condition；General frame finite element model is established, finally determines the unit coordinate system of each beam element.The present invention is put forward for the first time at home and is successfully realized general frame finite element model method for fast establishing, and this method physical concept is apparent, operating method is simple, implementation result is good.
Description
Technical field
The invention belongs to technical field of structural strength, are related to a kind of general frame finite element model method for fast establishing.
Background technique
In field of engineering technology, it is frequently encountered discrete topology problem, for example, continuous beam, building in the mechanics of materials
Structural framing and truss structure, the fixture of aircraft mechanical test etc..It is available for simple discrete topology accurate
Theory Solution, although and for complicated discrete topology theoretically for can solve, since amount of calculation is very huge,
It generally requires by computer technology.
General frame largely uses during the static(al) of aircraft and fatigue test, and designing quality is by direct shadow
Ring the quality of test.In order to ensure general frame has enough rigidity, while making general frame within the scope of safety margin again
Reach weight minimum with save the cost, must just carry out stiffness analysis and intensive analysis to it.
Summary of the invention
The object of the present invention is to provide a kind of general frame finite element model method for fast establishing.
Technical scheme is as follows: a kind of general frame finite element model method for fast establishing, comprising the following steps:
Step 1: general frame is simplified, it is reduced to a series of beams；
Step 2: classifying to simplified beam；
Step 3: determining the coordinate system of general frame, determines the extreme coordinates of each beam, provide computational accuracy, error
First selected beam-ends point of processing, and the intersecting point coordinate between Liang Yuliang is calculated；
Step 4: determine load and constraint condition, and by the intersection point of load and constraint condition applied between point and beam
Coordinate is determined as hard spot；
Step 5: establishing general frame finite element model by PCL programming；
Step 6: determining the unit coordinate system of each beam element.
Detailed description of the invention
Fig. 1 is general frame finite element model figure；
Fig. 2 is X-coordinate error correction flow chart；
Fig. 3 is finite element model Establishing process figure；
Fig. 4 is two kinds of orientations of same beam section.
Specific embodiment
Since general frame is mainly made of profile, structure type is relatively single, but the general frame of each model
It is again different, it is mainly reflected in not being same as above for size and position.According to this feature, we pass through to this series of frame
Unified whole design is carried out, designer can be freed from relatively repeated manual mode, so that the design cycle
It greatly shortens, and avoids the shortcomings that being easy error by hand.Designer provides the coordinate and profile mark of each structural member two-end-point
Know symbol, establishes a series of straightways；Apply material property (cross-section data) according to profile identifier；Load is provided in the form of coordinate points
Lotus and constraint generate finite element model.
The present invention will be further described with reference to the accompanying drawings and examples:
Step 1 simplifies general frame, is reduced to a series of beams；
General frame is welded or is spirally connected by profile, for macrostructure, ignores connection shape when carrying out strength check
A series of formula, using full contact, in this way, general frame is treated as profile sections (beam).
Step 2 classifies to simplified beam；
Step 3 establishes coordinate system, provides the extreme coordinates of each beam；The extreme coordinates of beam can be on mathematical model
Easily read.Computational accuracy is provided, error handling procedures select first beam-ends point, according to setting numerical value respectively to X, Y, Z
Coordinate is modified (Fig. 2) under double circulation；Intersecting point coordinate calculates between Space Beam and beam；All Liang Yinqi of general frame
The determination of two-end-point coordinate and completely determine, the calculation method of intersecting point coordinate includes: that (1) is divided into straightway according to coordinate plane
Three groups；(2) each group of all line segment double circulations are traversed；(3) two straight lines are judged, including parallel, intersection, straight line
Slope there is no etc.；(4) antinode is judged according to straightway section, to remove unwanted intersection point；
Step 4 determines load and constraint condition, and by the intersection point of load and constraint condition applied between point and beam
Coordinate is determined as hard spot；
Step 5 establishes general frame finite element model by PCL programming；
Step 6, the unit coordinate system for determining each beam element.
The section moment of inertia of beam is defined using unit coordinate system, and different orientation leads to different bearing capacitys.Beam element
Coordinate system determines (Fig. 4) by the principal direction of beam.
Reference axis (such as Z axis) perpendicular to the ground has been determined, then the principal direction definition of beam is judged according still further to X, Y-axis,
If straight line parallel in X-axis, the principal direction of beam is<0,1,0>, if straight line parallel, in Y-axis, the principal direction of beam is<1,0,
0>, otherwise defined according to the cosine of the straight line and X-axis angle α and with the sine of Y-axis angle, it may be assumed that<cos α, sin α, 0>.
Claims (1)
1. a kind of general frame finite element model method for fast establishing, which comprises the following steps:
Step 1: general frame is simplified, a series of beams are reduced to, which is welded or be spirally connected by profile；
Step 2: classifying to simplified beam；
Step 3: determining the coordinate system of general frame, determines the extreme coordinates of each beam, provide computational accuracy, Error processing
First selected beam-ends point, and the intersecting point coordinate between Liang Yuliang is calculated；
Step 4: determine load and constraint condition, and by the intersecting point coordinate of load and constraint condition applied between point and beam
It is determined as hard spot；
Step 5: establishing general frame finite element model by PCL programming；
Step 6: determining the unit coordinate system of each beam element.
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| CN201410752819.3A CN105739958B (en) | 2014-12-10 | 2014-12-10 | A kind of general frame finite element model method for fast establishing |
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| CN201410752819.3A CN105739958B (en) | 2014-12-10 | 2014-12-10 | A kind of general frame finite element model method for fast establishing |
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| CN105739958A CN105739958A (en) | 2016-07-06 |
| CN105739958B true CN105739958B (en) | 2019-02-15 |
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Families Citing this family (1)
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| CN106777743B (en) * | 2016-12-28 | 2017-10-24 | 石家庄铁道大学 | The finite element modeling method of hydraulic suspension structure |
Citations (3)
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|---|---|---|---|---|
| JPH06317506A (en) * | 1992-11-09 | 1994-11-15 | Mitsubishi Electric Corp | Operation processing device and piping layout position setting method |
| CN101281659A (en) * | 2008-04-28 | 2008-10-08 | 南京航空航天大学 | Method for modeling finite element of multi-frame integral structure component |
| CN102254061A (en) * | 2011-06-09 | 2011-11-23 | 山东电力研究院 | Finite element modeling and bearing method for line-tower coupling system of power transmission tower |
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2014
- 2014-12-10 CN CN201410752819.3A patent/CN105739958B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06317506A (en) * | 1992-11-09 | 1994-11-15 | Mitsubishi Electric Corp | Operation processing device and piping layout position setting method |
| CN101281659A (en) * | 2008-04-28 | 2008-10-08 | 南京航空航天大学 | Method for modeling finite element of multi-frame integral structure component |
| CN102254061A (en) * | 2011-06-09 | 2011-11-23 | 山东电力研究院 | Finite element modeling and bearing method for line-tower coupling system of power transmission tower |
Non-Patent Citations (2)
| Title |
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| 《MSC.NASTRAN 中偏心梁的有限元建模问题》;孙秀峰 等;《弹箭与制导学报》;20050228;第25卷(第1期);第249-251页 |
| 《钢管混凝土框架结构力学性能非线性有限元分析》;王文达 等;《建筑结构学报》;20081231;第29卷(第6期);第75-83页 |
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