Safety, environmental protection and energy conservation are the three hot issues facing the car. How to improve the anti-collision ability of the car body is one of the problems that need to be solved in the passive safety of the car. The finite element method is used to simulate the car collision process, which involves nonlinear problems such as large deformation, which is different from the general finite element analysis. Because simulation calculation can save expensive real vehicle crash test funds, and simulation analysis is the only analysis method in the design stage, domestic and foreign automobile companies generally adopt this method. The LSDYNA module in ANSYS software is often used for simulation analysis of car crash processes. 3. Vehicle dynamics simulation analysis The multi-body (rigid body and soft body) dynamics analysis method is used to simulate the vehicle dynamics, and the dynamic performance of the vehicle can be predicted in the research stage. These performances are optimized to improve product performance, shorten development time and reduce development costs. the goal of. Taking the handling stability of the whole vehicle as an example, because the influencing factors involve tires, suspension, steering and other aspects, it is difficult to obtain reasonable conclusions from simple calculations, even qualitative conclusions are often not reliable. To this end, a variety of mechanical dynamics simulation software has been developed. It is worth mentioning that the American ADAMS software of MDI is widely used for dynamic simulation of vehicle handling stability and vehicle ride comfort. The TIRE module in ADAMS provides several tire models for analysis to accurately model the dynamics of the tire. The CAR module in ADAMS is designed for automotive dynamics simulation and is very easy to use. Many domestic automobile companies have used the software to carry out dynamic simulation analysis of trucks, cars, car trains and buses, and achieved good results. Third, the specific implementation of CAE and software introduction As an analytical tool, CAE can be implemented separately and used with other CAXs. For example, finite element analysis software generally provides corresponding front and rear processing modules, which can be used alone or integrated with CAD software. The following is a brief introduction to the implementation process and software of finite element analysis and mechanical dynamics simulation. 1. Finite element analysis process and finite element software for auto parts Several dozen finite element analysis commercial software can be listed. Only the most widely used IDEAS, ANSYS and NASTRAN in the analysis of the structure of automotive parts are presented here. SDRC's IDEAS software is integrated software including CAD, CAE, CAPP/CAM, PDM and so on. Entity modeling, network partitioning, application of loads and constraints, solution and post-processing can be done by different modules of the software. ANSYS' ANSYS software is a specialized finite element analysis software. The pre- and post-processing and solution can also be done by this software. MSC's NASTRAN finite element software has a special pre- and post-processing software PATRAN. The analysis process is similar to IDEAS and ANSYS. The above shows that each company's finite element software can complete the finite element analysis task independently. Of course, the various software described above also provides an interface to a variety of CAD software. In general, the modeling capabilities of finite element software are not as powerful as specialized CAD software. Only by combining them can you better use their functions. When analyzing the bending strength of the cross shaft of the automotive transmission parts, the author takes the following route: First, the geometric model of the cross shaft is established by Pro/E and the network division is completed, and the ANSYS file format is used. The ans output model is then read into the model by ANSYS and the subsequent analysis is completed. Figure 1 shows a cross-axis model modeled and meshed by Pro/E. Of course, ANSYS can also be read directly into Pro/E. The subsequent tasks of prt file, meshing and finite element analysis are all done by ANSYS. Previous Next Folding Table,Trestle Tables,Outdoor Table Shoe Rack,Shoe Cabinet Co., Ltd. , http://www.nsstoragebox.com
2. Application of passive safety of automobiles 
Figure 1 Cross-axis model modeled by Pro/E and meshed