CN102750409A - Mesh layout method for simulating deformation of free surfaces of rubber spherical hinge - Google Patents
Mesh layout method for simulating deformation of free surfaces of rubber spherical hinge Download PDFInfo
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- CN102750409A CN102750409A CN201210189974XA CN201210189974A CN102750409A CN 102750409 A CN102750409 A CN 102750409A CN 201210189974X A CN201210189974X A CN 201210189974XA CN 201210189974 A CN201210189974 A CN 201210189974A CN 102750409 A CN102750409 A CN 102750409A
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Abstract
The invention provides a mesh layout method for simulating deformation of free surfaces of a rubber spherical hinge. The method includes marking out a position where distortion emerges first through initial mesh division and extrusion analysis and performing vertical subdivision at the position so as to guide further emerging distortion; dividing a rubber spherical hinge model into a central area and an end area through a main subdivision line and dividing the end area into five sections through a main depth subdivision line and an auxiliary depth subdivision line; and performing meshing on request at last, performing parameterization configuration on the meshes along with surface depth, laying out meshes in a suitable quantity on each free surface, and finishing the mesh layout through regulation of the mesh density. According to the mesh layout method, shape features and loading characteristics of the free surfaces of the rubber spherical hinge are reflected by the divided meshes, therefore mesh setting requirements in a high distortion area can be satisfied, stress results of the high distortion area is predicted accurately, and a premise is provided for finishing the deformation simulation of the free surfaces of the rubber spherical hinge.
Description
Technical field
The present invention relates to the grid layout technical field of finite element analysis simulation rubber bushing free face distortion, more particularly, relate to a kind of layout method of simulating the grid of rubber bushing free face distortion.
Background technology
Rubber bushing can provide the degree of freedom and the distortion of six direction as connecting the joint, is widely used in fields such as engineering machinery, railway and boats and ships.In actual use, need to satisfy fatigue lifetime of rubber bushing certain requirement.At present; In order to promote the fatigue lifetime of rubber bushing; Earlier rubber bushing is carried out extruding to a certain degree before use, through analysis software the motion state of rubber bushing is carried out analog simulation then, to guarantee that rubber bushing remains compressing stress state in load bearing process.
At present, the analog simulation to the distortion of rubber bushing free face adopts grid dividing software to realize.Existing grid layout method is following:
At first create the cad model of rubber bushing; And be converted into the model file of def (a kind of file extension of simulating defined file) form; Import general grid dividing software (like hypermesh) to model file then, and the generating mesh model, the integral grid size of model is set subsequently; And closeer unit number is set on free margins, adopt hybrid-element method to generate rubber grid at last.
But; The grid that adopts prior art to divide only is based on the shape facility of model of fit, and the carrying stress characteristic according to model does not carry out layout, and the method for therefore existing grid layout can only reflect the shape facility of model; And can't reflect the bearer properties of model structure; This causes in the analogue simulation process, and the unit of some regional area on rubber bushing surface tends to because of the high distortion distortion appears in the free face, causes certain node of unit to penetrate the face at place, affiliated unit thereby make unit itself produce large deformation; Even occur from abnormal metaboly such as trivial; Finally cause analyzing and to carry out, promptly can't accomplish simulation, just can't guarantee that also rubber bushing remains compressing stress state in load bearing process the distortion of rubber bushing free face.
In sum; How a kind of layout method of simulating the grid of rubber bushing free face distortion is provided; So that the grid reaction of dividing goes out the style characteristic and the bearer properties of rubber bushing free face; And then, be present those skilled in the art's problem demanding prompt solution for the simulation of accomplishing the distortion of rubber bushing free face provides prerequisite.
Summary of the invention
The purpose of this invention is to provide a kind of layout method of simulating the grid of rubber bushing free face distortion; Make the grid reaction that marks off go out the style characteristic and the bearer properties of rubber bushing free face, and then be that the simulation of accomplishing the distortion of rubber bushing free face provides prerequisite.
In order to achieve the above object, the present invention provides following technical scheme:
A kind of layout method of simulating the grid of rubber bushing free face distortion comprises:
1) the rubber bushing model is divided initial mesh and pushed analysis, and identify four positions of torsional deformation at first;
2) do respectively perpendicular to the surperficial main degree of depth subdivision line in place, four positions; And interior ironware that extends to said rubber bushing model and outer ironware; Form two and go up contact point and two following contact points; Connect two said upward contact points respectively and connect two main subdivision lines of two the said formation of contact points down, said main subdivision line is divided into Zhong Qu and two petiolareas about district's symmetrical distribution in said with said rubber bushing model;
3) said main degree of depth subdivision line is divided into first free margins, second free margins and the 3rd free margins successively with the free margins of said petiolarea; Choosing a bit respectively on said first free margins with on said the 3rd free margins near said main degree of depth subdivision line; And make the secondary degree of depth subdivision line of putting said surface perpendicular to this; Second subarea and the 3rd subarea and the 4th subarea and the 5th subarea that said main degree of depth subdivision line and said secondary degree of depth subdivision line are divided into said petiolarea first subarea and are symmetrically distributed about said first subarea;
4) the rubber bushing model is repartitioned grid; Grid number on the said main degree of depth subdivision line is identical with grid number on the said secondary degree of depth subdivision line and be not less than 2; In said first subarea: the grid number on the free margins of said petiolarea is not less than 4; And the length value of said main degree of depth subdivision line and the grid number purpose ratio on it respectively greater than said free margins length value and the grid number purpose ratio on it and with the length value of the non-free margins of said petiolarea and the grid number purpose ratio on it; In said second subarea, said the 3rd subarea, said the 4th subarea and said the 5th subarea in any one: the grid number average on the free margins of said petiolarea is not less than 2, and the length value of said secondary degree of depth subdivision line and the grid number purpose ratio on it respectively greater than the length value of coupled said free margins and the grid number purpose ratio on it and with the length value of the non-free margins of said petiolarea and the grid number purpose ratio on it;
5) the rubber bushing model conversation that will repartition grid is a hexahedron solid element model, pushes and analyzes and the extraction and analysis result, judges whether said analysis result restrains, if not, then get into step 6); If then accomplish the grid layout;
6) progressively increase mesh-density according to step 4), and return step 5).
Preferably, in the above-mentioned layout method, it is that two sections the point of 4:6 is made secondary degree of depth subdivision line that said step 3) is selected on said first free margins it is divided into length ratio; Selecting on said the 3rd free margins it is divided into length ratio is that two sections the point of 4:6 is made secondary degree of depth subdivision line.
The layout method of the grid of simulation rubber bushing provided by the invention free face distortion; At first divide and push to analyze and find the position that occurs torsional deformation at first through initial mesh; And carrying out rectilinear subdivision in this position, district and petiolarea in through main subdivision line the rubber bushing model being divided into then are divided into five sections through main degree of depth subdivision line and secondary degree of depth subdivision line with petiolarea; Repartition grid at last as requested, accomplish the grid layout.The layout method of the grid of simulation rubber bushing provided by the invention free face distortion; Rectilinear subdivision is done in position occurring torsional deformation at first; In order to guiding the torsional deformation of further appearance, and the grid of rubber Free Surface carries out the parametrization configuration with case depth, arranges the grid of suitable quantity in each free face; And through adjustment mesh-density completion grid layout; Then above-mentioned layout method, the grid that marks off have reflected the style characteristic and the load characteristic of rubber bushing free face, and then the grid that can satisfy high distortion zone is provided with requirement; The regional stress result of the high distortion that calculated to a nicety is for the simulation of accomplishing the distortion of rubber bushing free face provides prerequisite.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of the layout method of the grid that the simulation rubber bushing free face that Fig. 1 provides for the embodiment of the invention is out of shape;
Rubber bushing structure of models synoptic diagram in the layout method of the grid that the simulation rubber bushing free face that Fig. 2 provides for the embodiment of the invention is out of shape;
The synoptic diagram that occurs the position of torsional deformation in the layout method of the grid that the simulation rubber bushing free face that Fig. 3 provides for the embodiment of the invention is out of shape at first;
Whole vertical main degree of depth subdivision is carried out synoptic diagram in the layout method of the grid that the simulation rubber bushing free face that Fig. 4 provides for the embodiment of the invention is out of shape;
Whole main subdivision is carried out synoptic diagram in the layout method of the grid that the simulation rubber bushing free face that Fig. 5 provides for the embodiment of the invention is out of shape;
The petiolarea subdivision is carried out synoptic diagram in the layout method of the grid of the simulation rubber bushing free face distortion that Fig. 6 embodiment of the invention provides;
Petiolarea grid cloth office synoptic diagram in the layout method of the grid that the simulation rubber bushing free face that Fig. 7 provides for inventive embodiments is out of shape;
Form the synoptic diagram of the rubber bushing model of quadrilateral mesh in the layout method of the grid of the simulation rubber bushing free face distortion that Fig. 8 inventive embodiments provides;
The hexahedron solid element model synoptic diagram that forms in the layout method of the grid of the simulation rubber bushing free face distortion that Fig. 9 inventive embodiments provides.
Among last Fig. 1-9:
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Among this paper, the free margins of petiolarea is meant in the rubber bushing model, the limit that rubber 2 does not link to each other with outer ironware 3 with interior ironware 1; The non-free margins of petiolarea is meant in the rubber bushing model, the limit that rubber 2 links to each other with interior ironware 1 or outer ironware 3.
Please refer to accompanying drawing 1-Fig. 9, the invention provides a kind of layout method of simulating the grid of rubber bushing free face distortion, comprising:
Step S01: the rubber bushing model is divided initial mesh and pushed analysis, and identify four positions of torsional deformation at first;
The bearer properties that can reflect the rubber bushing free face for the grid that guarantees to mark off; Need through existing grid dividing method the rubber bushing model to be divided earlier; Utilize existing extruding analytical technology, find out and identify the position that occurs torsional deformation at first.The rubber bushing structure of models is as shown in Figure 2; Because the special construction of rubber bushing model; The position that occurs torsional deformation at first must appear on the easy on and off limit of rubber 2 of rubber bushing model; And quantity be 4 concrete, this position is as shown in Figure 3, is respectively primary importance A, second place B, the 3rd position C, the 4th position D.
Step S02: the rubber bushing model is divided into Zhong Qu, two petiolarea three parts;
Vertical surface formula subdivision is carried out in four positions occurring torsional deformation at first; Promptly make main degree of depth subdivision line 24 respectively perpendicular to surface, place, four positions; And extend to the interior ironware 1 and outer ironware 3 of rubber bushing model; Form two and go up contact point and two following contact points, as shown in Figure 4, connect two respectively and go up contact point and connect two main subdivision lines 25 of two following contact points formation; Main subdivision line 25 is divided into Zhong Qu and two petiolareas that are symmetrically distributed about middle district with the rubber bushing model, and is as shown in Figure 5.
Step S03: the petiolarea of rubber bushing model is divided into five sub-areas;
Main degree of depth subdivision line 24 is divided into first free margins 21, second free margins 22 and the 3rd free margins 23 successively with the free margins of petiolarea; Like Fig. 4 and shown in Figure 5; On first free margins 21, choose near the one point union of main degree of depth subdivision line 24 and make secondary degree of depth subdivision line 26 perpendicular to this surface, some place; On the 3rd free margins 23, choose near the one point union of main degree of depth subdivision line 24 and make secondary degree of depth subdivision line 26 perpendicular to this plane, some place; The second subarea b and the 3rd subarea c and the 4th subarea d and the 5th subarea e that main degree of depth subdivision line 24 and secondary degree of depth subdivision line 26 are divided into petiolarea the first subarea a and are symmetrically distributed about the first subarea a, as shown in Figure 6;
Step S04: the rubber bushing model is repartitioned grid;
The rubber bushing model is repartitioned grid, and the requirement of dividing grid is following:
Grid number on the main degree of depth subdivision line 24 is identical with grid number on the secondary degree of depth subdivision line 26 and be not less than 2; In the first subarea a: the grid number on the free margins of petiolarea be not less than 4 and the length value of main degree of depth subdivision line 24 and the grid number purpose ratio on it respectively greater than the length value of free margins and the grid number purpose ratio on it and with the length value of the non-free margins of petiolarea and the grid number purpose ratio on it; In any one of the second subarea b, the 3rd subarea c, the 4th subarea d and the 5th subarea e: the grid number average on the free margins of petiolarea is not less than 2, and the length value of secondary degree of depth subdivision line 26 and the grid number purpose ratio on it respectively greater than the length value of coupled free margins and the grid number purpose ratio on it and with the length value of the non-free margins of petiolarea and the grid number purpose ratio on it.
Above-mentioned requirements can be represented through formula; As shown in Figure 7; The free margins in each subarea (among the first subarea a, the second subarea b, the 3rd subarea c, the 4th subarea d and the 5th subarea e any) and the length of non-free margins are Li, and the unit number on the free margins in each subarea and the non-free margins is Mi, and the length of the degree of depth subdivision line in each subarea is Hi; Unit number on the degree of depth subdivision line in each subarea is Ni, and Li, Mi, Hi, Ni satisfy following the requirement:
L
01, L
11, L
02, L
22, L
03, L
33>=0 and M
1, M
3>=2, M
2>=4 (1)
H
1,H
2,H
3≥0?and N
1=N
2=N
3≥2 （2）
According to above-mentioned grid dividing requirement; Emphatically three quadrilateral subareas of petiolarea are divided; In each quadrilateral subarea, mate quadrature formula (coupling; Be meant that there is certain quantitative relation in the grid number on the limit of each sub-areas, also there are some relations in the grid number on the adjacent limit, subarea, shown in above-mentioned formula (1)-(5); Quadrature is meant that main degree of depth subdivision line 24 is vertical subdivision line with secondary degree of depth subdivision line 26), the grid layout of parametrization (shown in above-mentioned formula (1)-(5)).
After the rubber bushing model is divided, form the rotational symmetry quadrilateral mesh, the integral grid layout is as shown in Figure 8.
Step S05: the rubber bushing model conversation that will repartition grid is a hexahedron solid element model, pushes then and analyzes and the extraction and analysis result, and whether the discriminatory analysis result restrains, if not, then get into step S06; If then accomplish the grid layout;
The rubber bushing model conversation of generating mesh is become hexahedron solid element model, as shown in Figure 9, push and analyze and the extraction and analysis result, if analysis result is successfully restrained, then recommend analysis result, grid dividing is successful, has promptly accomplished the layout of grid; If analysis result convergence failure then gets into step S06.
Step S06: progressively increase mesh-density according to step S04, and return step S05;
If analysis result convergence failure then according to the requirement of formula (1) ~ (5), progressively increases mesh-density, regenerate rotational symmetry quadrilateral units and hexahedron solid element, analyze once more, up to analyzing successfully convergence, then accomplish the grid layout.
The layout method of the grid of the simulation rubber bushing free face distortion that the embodiment of the invention provides; At first divide and push to analyze and find the position that occurs torsional deformation at first through initial mesh; And carrying out rectilinear subdivision in this position, district and petiolarea in through main subdivision line 25 the rubber bushing model being divided into then are divided into five section with secondary degree of depth subdivision line 26 with petiolarea through main degree of depth subdivision line 24; Repartition grid at last as requested, accomplish the grid layout.
The layout method of the grid of the simulation rubber bushing free face distortion that the embodiment of the invention provides; The subdivision grid of vertical surface formula is carried out in the position that occurs twisting at first on rubber 2 surfaces, and in order to guide the torsional deformation of further appearance, this grid layout can reflect the style characteristic and the load characteristic of the free face of rubber 2 simultaneously; Thereby the grid that can satisfy the high distortion zone fully is provided with requirement; The stress result in the high distortion that can calculate to a nicety zone, and, the grid that forms at the Free Surface of rubber 2; Can realize high-quality quadrilateral mesh requirement, mesh quality can be up to 0.75; Simultaneously, can guarantee that the grid of the Free Surface division of rubber 2 can be according to the size of amount of compression,, parametrization close from dredging adjusted the mesh-density of the Free Surface of rubber 2, and then makes the grid of the Free Surface of rubber 2 carry out the parametrization configuration with case depth.
In a word; The layout method of the grid of the simulation rubber bushing free face distortion that the embodiment of the invention provides; According to the amount of compression of rubber bushing model with carry size, but quadrature formula, parametrization adjustment grid are mated the needs of amount of compression and operating load, mesh-density progressively increases from small to large; Thereby the Free Surface at rubber 2 marks off the grid layout that can adapt to the high distortion state, and mesh quality reaches the tetragonal rubber grid more than 7.5.The layout method of the grid that the foregoing description provides; The grid that marks off has reflected the style characteristic and the load characteristic of rubber bushing free face; And then the grid that can satisfy the high distortion zone is provided with requirement; The regional stress result of the high distortion that calculated to a nicety is for the simulation of accomplishing the distortion of rubber bushing free face provides prerequisite.
In the layout method of the grid of the simulation rubber bushing free face distortion that the foregoing description provides; Through progressively increasing mesh-density; Can further improve the mesh quality that reflects its bearer properties; And mesh quality can be up to more than 0.85, thus the stress result in the high distortion zone that calculates to a nicety out, for the simulation of accomplishing the distortion of rubber bushing free face provides prerequisite.
Preferably, in the layout method of the grid of simulation rubber bushing free face that the foregoing description provides distortion, selecting among the step S03 on first free margins 21 it is divided into length ratio is that two sections the point of 4:6 is made secondary degree of depth subdivision line 26; Selecting on the 3rd free margins 23 it is divided into length ratio is that two sections the point of 4:6 is made secondary degree of depth subdivision line 26.Divide petiolarea like this, and then divide grid, make the grid of dividing more can embody the bearer properties of rubber bushing model, make mesh quality higher.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (2)
1. a layout method of simulating the grid of rubber bushing free face distortion is characterized in that, comprises step:
1) the rubber bushing model is divided initial mesh and pushed analysis, and identify four positions of torsional deformation at first;
2) do respectively perpendicular to the surperficial main degree of depth subdivision line (24) in place, four positions; And extend to the interior ironware (1) and the outer ironware (3) of said rubber bushing model; Form two and go up contact point and two following contact points; Connect two said upward contact points respectively and connect two the said formation of contact points down two main subdivision lines (25), said main subdivision line (25) is divided into Zhong Qu and two petiolareas about district's symmetrical distribution in said with said rubber bushing model;
3) said main degree of depth subdivision line (24) is divided into first free margins (21), second free margins (22) and the 3rd free margins (23) successively with the free margins of said petiolarea; Upward with on said the 3rd free margins (23) choose a bit respectively at said first free margins (21) near said main degree of depth subdivision line (24); And make the secondary degree of depth subdivision line (26) of putting said surface perpendicular to this; Second subarea (b) and the 3rd subarea (c) and the 4th subarea (d) and the 5th subarea (e) that said main degree of depth subdivision line (24) and said secondary degree of depth subdivision line (26) are divided into said petiolarea first subarea (a) and are symmetrically distributed about said first subarea (a);
4) the rubber bushing model is repartitioned grid; Grid number on the said main degree of depth subdivision line (24) is identical with grid number on the said secondary degree of depth subdivision line (26) and be not less than 2; In said first subarea (a): the grid number on the free margins of said petiolarea is not less than 4; And the length value of said main degree of depth subdivision line (24) and the grid number purpose ratio on it respectively greater than the length value of said free margins and the grid number purpose ratio on it and with the length value of the non-free margins of said petiolarea and the grid number purpose ratio on it; In said second subarea (b), said the 3rd subarea (c), said the 4th subarea (d) and said the 5th subarea (e) in any one: the grid number average on the free margins of said petiolarea is not less than 2, and the length value of said secondary degree of depth subdivision line (26) and the grid number purpose ratio on it respectively greater than the length value of coupled said free margins and the grid number purpose ratio on it and with the length value of the non-free margins of said petiolarea and the grid number purpose ratio on it;
5) the rubber bushing model conversation that will repartition grid is a hexahedron solid element model, pushes and analyzes and the extraction and analysis result, judges whether said analysis result restrains, if not, then get into step 6); If then accomplish the grid layout;
6) progressively increase mesh-density according to step 4), and return step 5).
2. layout method according to claim 1 is characterized in that, select said first free margins (21) to go up in the said step 3) it being divided into length ratio is that two sections the point of 4:6 is made secondary degree of depth subdivision line (26); Select said the 3rd free margins (23) to go up it being divided into length ratio is that two sections the point of 4:6 is made secondary degree of depth subdivision line (26).
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| CN111159954B (en) * | 2020-01-02 | 2023-04-14 | 株洲时代新材料科技股份有限公司 | Free-form surface mesh layout and finite element analysis method, system and medium for elastic element |
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| CN102750409B (en) | 2015-02-25 |
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