Weight Lighting Of The City Bus Body By FEM Analysis

Skeleton of vehicle body is one of the most important components for passenger car. It’s weight is about one third of the completed vehicle kerb mass. The weight lighting of skeleton is of great importance to reduce the vehicle weight. This dissertation seeks feasible method for the weight lighting of the vehicle body by FEM (finite element method) analysis. The work of this dissertation includes passenger body theory, FEM theory, ANSYS application, the static and dynamic tests and so on. There are many special topics such as establishing and predigestion of FEM model, post-processor of ANSYS, prepare of test and cautions.With application of the FEA software ANSYS and shell element which has high precision, this dissertation optimizes the size and thickness of skeleton section and seeks steel pipes which still have strength and stiffness surplus under static state working condition: sinkage of 240mm of rear wheel. It is fully loaded in the state of static bending and torsion. After that, amelioration is achieved for even strength design. During the research, a static state strength and stiffness test has been made so that a comparison can get between simulation results and test results. Furthermore, after that a dynamic test was hold in DingYuan standard testing ground of Anhui province. The experiment results are used to modify the FEM model.Since the bus body has too many stems and dimension, the method used in the research is the combine .of alternant amelioration and orthogonal calculation. This research had done a large number of calculations in different working condition for different stems.The results show that this combine method is fit for the whole skeleton of bus body weight lighting. The weight lighting of this bus body is about 128Kg.