The Finite Element Analysis And Optimization Of The Electric Vehicle Frame

Frame is one very important part in vehicle assembly, especially in electrictruck with half bearing body, in which the frame not only bears the body, engineassembly, chassis system, adornment and the loading goods, but also bears variouscomplicated static load and dynamic load transferring from the road and engineassembly. This paper uses finite element skill to analyze and optimize the framewhich is very important for frame. Using finite element skill not only can accuratelyjudge if frame’s various performances reach the requirement of design and use, butalso can improve vehicle’s various performance with low design and manufacturecost.First of all, this paper introduced in detail the domestic and internationalresearch status and development potential of finite element technique, the frame’s3Dmodel establishing in CATIA, the frame’s finite element model creating ANSYSWorkbench, and also this paper appropriately simplified the structure which had alittle influence on dynamic and static performance so that saving a lot of time andimproving the accuracy of calculation.And then through the dynamic performance analysis, we not only got thenatural frequency of the electric truck frame, but also obtained its normal vibrationmode which was compared and analyzed with external vibration so that we canknow if the frame occurred resonance to improve its modal parameter; through thestatic research, we got its equivalent displacement map and equivalent stress map onthe two typical conditions of bending and twisting with full load to discuss if theframe’s stiffness and strength meet the design requirement.At last, the frame was carried out shape optimization under four differentconditions, such as horizontal bending, front-wheel hanging torsion, rear-wheelhanging torsion and diagonal-wheels hanging torsion, therefore, we determined theframe’s basic layout structure and verified this layout under the above mentioned fourdifferent conditions. This not only could give higher vehicle performance but alsocould improve the market competitiveness with lower design and manufacturing cost.