CN106649903A - Hybrid grid partitioning method of truck torsion bar type turnover mechanism finite element model - Google Patents
Hybrid grid partitioning method of truck torsion bar type turnover mechanism finite element model Download PDFInfo
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Abstract
The invention discloses a hybrid grid partitioning method of a truck torsion bar type turnover mechanism finite element model. The method comprises the steps that a geometric model of a truck torsion bar type turnover mechanism is constructed; grid partitioning software is utilized for carrying out geometric Boolean operation on the contact face between a torsion bar arm, a torsion bar shaft and a spherical hinge in the geometric model, so that the contact face between the torsion bar arm, the torsion bar shaft and the spherical hinge achieves node merging; the contact face of the torsion bar arm is expanded to form a transition area, and geometric cutting partitioning is carried out to obtain a transition area and a complex area; the torsion bar shaft and the spherical hinge are subjected to full hexahedron grid partitioning, pentahedron grid portioning is adopted for the transition area of the torsion bar arm, tetrahedral grid portioning is adopted for the complex area of the torsion bar arm, and hybrid grid portioning of the torsion bar type turnover mechanism is completed. The truck torsion bar type turnover mechanism can be subjected to fast finite element grid portioning, calculation precision is not influenced, meanwhile, pretreatment efficiency can be improved, the product development quality can be improved, time can be saved, and the human cost can be reduced.
Description
Technical field
The present invention relates to the finite element model analysis technology of lorry torsion bar type switching mechanism, and in particular to a kind of mixed mesh method of lorry torsion bar type switching mechanism FEM model.
Background technology
Lorry torsion bar type switching mechanism is to overcome the gravitational moment of driver's cabin to realize the mechanism of driver's cab turnover using the torsional moment of torsion bar on a kind of lorry。Lorry torsion bar type switching mechanism includes torsion bar shaft, torsion bar arm and ball pivot, and torsion bar shaft is respectively arranged at the two ends with a torsion bar arm, and each torsion bar arm is provided with a ball pivot.The upset of major part light truck cab over engine at present, all it is to be realized by the switching mechanism of torsion bar type, compared to hydraulic mechanism, the features such as torsion bar mechanism has easy arrangement, operation light and flexible, reliability is high, makes driver's cabin front support have supporting, vibration damping, the Trinitarian effect of turn over function.The upset performance of driver's cabin is directly influenced as the size of the important composition component of lorry, torsion bar rigidity and pre- torsional angle, therefore in the exploitation early stage of product, finite element stimulation is carried out to torsion bar structure and is also particularly important.In the middle of the finite element analysis process to torsion bar type switching mechanism, what is most made the effort should be the stress and strain model of pretreatment stage, due to the spherical hinge structure of torsion bar arm and its cooperation it is typically complex, stress and strain model is a complexity and time-consuming process, the development efficiency of product is leveraged, while so that the process of structure optimization also becomes difficult.
At present when FEM meshing is carried out to torsion bar type switching mechanism, typically using single trellis-type：All using tetrahedral grid unit and all using hexahedral mesh unit.When all using tetrahedral grid unit, such pre-treatment time takes short, and all kinds of complicated structures can be easily accomplished, but computational accuracy is not high, stress concentration easily occurs in main stress region；When all using hexahedral mesh unit, the realization of whole hexahedral mesh units is more difficult, particularly complicated structure, typically first structure can be simplified, then division that hexahedral mesh is carried out with more energy is being taken a long time, although it is relatively easy that the result for so dividing calculates convergence, substantial amounts of time and efforts is consumed, while the simplification in some labyrinth regions also can produce some unknown impacts to result of calculation.It is in the shortcoming that FEM meshing is carried out to torsion bar type switching mechanism at present：（1）, Meshing Method it is single：Stress and strain model is carried out to torsion bar type switching mechanism and has its obvious shortcoming using full tetrahedron or complete hexahedral grid cell.（2）, result of calculation it is not accurate enough：The result of calculation of the switching mechanism divided using full tetrahedral grid unit is not accurate enough, and when using hexahedral mesh to divide, due to the over-simplification of partial geometry, can also cause computation structure to be affected.（3）, expend time and efforts：Can be taken a substantial amount of time using all-hexahedral element mesh dividing elements and energy, reduce operating efficiency.（4）, affect development efficiency：Existing method can reduce the process of product development in implementation process, affect development efficiency and development quality.Therefore a kind of efficiently and effectively method of lorry torsion bar type switching mechanism FEM model stress and strain model how is set up, it has also become a key technical problem urgently to be resolved hurrily.
The content of the invention
The technical problem to be solved in the present invention：For the problems referred to above of prior art, there is provided one kind can carry out rapid finite unit stress and strain model to lorry torsion bar type switching mechanism, while computational accuracy is not affected, pre-treatment efficiency, improving product development quality, the mixed mesh method of the lorry torsion bar type switching mechanism FEM model of time-consuming and human cost can be improved.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：
A kind of mixed mesh method of lorry torsion bar type switching mechanism FEM model, step includes：
1）Create the geometrical model of lorry torsion bar type switching mechanism；
2）Respectively geometry Boolean calculation is carried out to the contact surface between the contact surface in geometrical model between torsion bar shaft, torsion bar arm, torsion bar arm and ball pivot using stress and strain model software, make the contact surface between the contact surface between torsion bar shaft, torsion bar arm, torsion bar arm and ball pivot reach the requirement of conode；
3）Torsion bar arm diametrically extends respectively the transitional region that the distance specified forms torsion bar arm with the contact surface of torsion bar shaft, ball pivot, the transitional region include torsion bar arm respectively with torsion bar shaft, the transitional region of ball pivot；Torsion bar arm is carried out into geometry cutting to divide, transitional region and the complex region in addition to transitional region is obtained；
4）All-hexahedral element mesh division is carried out to torsion bar shaft and ball pivot, tetrahedron or pyramidal pentahedron stress and strain model are adopted to the transitional region of torsion bar arm, the complex region of torsion bar arm is divided using tetrahedral grid, the mixed mesh of torsion bar type switching mechanism is completed.
Preferably, the step 2）In stress and strain model software specifically refer to Hypermesh softwares.
Preferably, the step 2）The step of before carrying out geometry Boolean calculation, also including being simplified geometrical model, remove the details position that stress and computational accuracy are not affected on geometrical model.
The mixed mesh method tool of lorry torsion bar type switching mechanism FEM model of the present invention has the advantage that：
1st, the present invention stress and strain model and pre-treatment are carried out to the FEM model of lorry torsion bar type switching mechanism, by taking torsion bar type switching mechanism different structure position different grid cell and division methods, rapid finite unit stress and strain model can be carried out to lorry torsion bar type switching mechanism, while computational accuracy is not affected, pre-treatment efficiency, improving product development quality can be improved, has the advantages that grid processes convenient effective, time-consuming and human cost.
2nd, mixed mesh method of the invention includes that geometry Boolean calculation, transitional region are formed and the cutting division of torsion bar arm geometry, the process of stress and strain model, the basic procedure of the mixed mesh method of a clear easy lorry torsion bar type switching mechanism FEM model is defined, it is easy to operate.
3rd, mixed mesh method of the invention carries out all-hexahedral element mesh division to torsion bar shaft and ball pivot, tetrahedron or pyramidal pentahedron stress and strain model are adopted for the transitional region of torsion bar arm, divided using tetrahedral grid for the complex region of torsion bar arm, complete the mixed mesh of torsion bar type switching mechanism, wasting time and energy of avoiding that all-hexahedral element mesh brings is inaccurate with the result of calculation that full tetrahedral grid brings, make full use of the loading characteristic of switching mechanism, rational deployment grid cell type, has accomplished the balance of computational accuracy and computational efficiency.
4th, for the FEM model grid pre-treatment work of other similar structures is also with very high reference value, the development efficiency and simulation capacity level for lift technique personnel provides certain guidance foundation to the present invention.
Description of the drawings
Fig. 1 is the basic procedure schematic diagram of present invention method.
Fig. 2 is the geometrical model of the lorry torsion bar type switching mechanism created in the embodiment of the present invention.
Fig. 3 is that torsion bar arm carries out the geometrical model after geometry cutting is divided in the embodiment of the present invention.
Fig. 4 completes the geometrical model partial schematic diagram that mixed mesh is obtained for the embodiment of the present invention.
Marginal data：1st, torsion bar shaft；2nd, torsion bar arm；3rd, ball pivot.
Specific embodiment
As shown in figure 1, the step of mixed mesh method of the present embodiment lorry torsion bar type switching mechanism FEM model includes：
1）The geometrical model of lorry torsion bar type switching mechanism is created, as shown in Fig. 2 geometrical model includes torsion bar shaft 1, torsion bar arm 2 and ball pivot 3, torsion bar shaft 1 is respectively arranged at the two ends with a torsion bar arm 2, and each torsion bar arm 2 is provided with a ball pivot 3.
2）Respectively geometry Boolean calculation is carried out to the contact surface between the contact surface between torsion bar shaft in geometrical model 1, torsion bar arm 2, torsion bar arm 2 and ball pivot 3 using stress and strain model software, make the contact surface between the contact surface between torsion bar shaft 1, torsion bar arm 2, torsion bar arm 2 and ball pivot 3 reach the requirement of conode；By geometry Boolean calculation, torsion bar shaft 1 is combined with torsion bar arm 2, torsion bar arm 2 with the contact surface of the structure of ball pivot 3, using the network style of conode not high and convergence difficulties the problem of computational accuracy that multiaspect is brought with face binding was avoided；
3）Torsion bar arm 2 is diametrically extended respectively the transitional region that the distance specified forms torsion bar arm 2 with the contact surface of torsion bar shaft 1, ball pivot 3（Region A and region B in Fig. 3）, the transitional region include torsion bar arm 2 respectively with torsion bar shaft 1, the transitional region of ball pivot 3, as shown in Figure 3；Torsion bar arm 2 is carried out into geometry cutting to divide, transitional region is obtained（The region A and region B of torsion bar arm 2 in Fig. 3）And the complex region in addition to transitional region（Region of the torsion bar arm 2 in addition to region A and region B in Fig. 3）；
4）All-hexahedral element mesh division is carried out to torsion bar shaft 1 and ball pivot 3, tetrahedron or pyramidal pentahedron stress and strain model are adopted to the transitional region of torsion bar arm 2, the complex region of torsion bar arm 2 is divided using tetrahedral grid, the mixed mesh of torsion bar type switching mechanism is completed, the geometrical model after mixed mesh is finally given as shown in Figure 4.
Torsion bar shaft 1 is considered in the present embodiment and the structure of ball pivot 3 is relatively easy, and result of calculation is also high spot reviews position, it is possible to divided using all-hexahedral element mesh；And the general structure of torsion bar arm 2 is complicated, it is difficult to all-hexahedral element mesh, therefore can be divided using hybrid grid type, torsion bar arm 2 is carried out into geometry cutting to divide, obtain transitional region and the complex region in addition to transitional region, as shown in figure 3, transitional region include torsion bar arm 2 respectively with torsion bar shaft 1, the transitional region of ball pivot 3, pentahedron stress and strain model is adopted for the transitional region of torsion bar arm 2, is divided using tetrahedral grid for the complex region of torsion bar arm 2.Respectively the contact with torsion bar shaft 1 and the structure of ball pivot 3 of torsion bar arm 2 is extended into certain distance towards diametric(al), the part and torsion bar arm 2 are cut open to come, the part is using tetrahedron or pyramidal pentahedron stress and strain model, respectively with the tetrahedral grid conode of the other parts of torsion bar arm 2, with the hexahedral mesh of torsion bar shaft 1 and ball pivot 3 conode is kept.The present embodiment carries out rational geometric layout to switching mechanism FEM model, respectively different grid cell types is adopted to different positions, the pre-treatment time is saved so as to reach, ensure FEM calculation precision, improve the purpose of product development efficiency, it is advantageous that the pluses and minuses for giving full play to various trellis-types, reasonable utilization is on the finite-element preprocessing of complicated switching mechanism, substantial amounts of time and manpower are saved, ensure that computational accuracy, to develop designer for the finite element simulation pre-treatment of lorry torsion bar type switching mechanism and other similar products provides detailed Technical Reference.
The present embodiment step 3）In stress and strain model software specifically refer to Hypermesh softwares.In addition, can also as needed using other specialty stress and strain model softwares, equally can also realize carrying out geometry Boolean calculation to the contact surface between the contact surface between torsion bar shaft 1, torsion bar arm 2, torsion bar arm 2 and ball pivot 3, its principle is identical with the present embodiment, will not be described here.
In the present embodiment, step 2）Before carrying out geometry Boolean calculation, also include being simplified geometrical model, remove the details position that stress and computational accuracy are not affected on geometrical model（Such as details position such as the screw thread at the two ends of torsion bar shaft 1）The step of, the simplification at the details position by not affecting stress and computational accuracy on above-mentioned geometrical model can simplify the data processing of mixed mesh, accelerate the time of mixed mesh, lift the efficiency of mixed mesh.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of mixed mesh method of lorry torsion bar type switching mechanism FEM model, it is characterised in that step includes：
1）Create the geometrical model of lorry torsion bar type switching mechanism；
2）Respectively geometry Boolean calculation is carried out to the contact surface between the contact surface in geometrical model between torsion bar shaft, torsion bar arm, torsion bar arm and ball pivot using stress and strain model software, make the contact surface between the contact surface between torsion bar shaft, torsion bar arm, torsion bar arm and ball pivot reach the requirement of conode；
3）Torsion bar arm diametrically extends respectively the transitional region that the distance specified forms torsion bar arm with the contact surface of torsion bar shaft, ball pivot, the transitional region include torsion bar arm respectively with torsion bar shaft, the transitional region of ball pivot；Torsion bar arm is carried out into geometry cutting to divide, transitional region and the complex region in addition to transitional region is obtained；
4）All-hexahedral element mesh division is carried out to torsion bar shaft and ball pivot, tetrahedron or pyramidal pentahedron stress and strain model are adopted to the transitional region of torsion bar arm, the complex region of torsion bar arm is divided using tetrahedral grid, the mixed mesh of torsion bar type switching mechanism is completed.
2. the mixed mesh method of lorry torsion bar type switching mechanism FEM model according to claim 1, it is characterised in that the step 2）In stress and strain model software specifically refer to Hypermesh softwares.
3. the mixed mesh method of lorry torsion bar type switching mechanism FEM model according to claim 1 and 2, it is characterised in that the step 2）The step of before carrying out geometry Boolean calculation, also including being simplified geometrical model, remove the details position that stress and computational accuracy are not affected on geometrical model.
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| CN111259536A (en) * | 2020-01-13 | 2020-06-09 | 上海应用技术大学 | Unit division method for irregular structure and embedded structure entity |
| CN111324984A (en) * | 2020-03-31 | 2020-06-23 | 福沃克汽车技术（苏州）有限公司 | Finite element modeling method for rubber body and outer pipe in auxiliary support bushing |
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