在车辆碰撞仿真实际应用中 ,计算的精度和时间是一对不可调和的矛盾 ,而网格密度的划分对这两者有着极为显著的影响 笔者以有限元显式中心差分法为理论基础 ,定量分析了有限元网格密度划分对计算精度的影响 ,并推导了计算效率随网格密度的变化关系 ,说明网格划分并非越细越好 ,最后通过一个实际模型的仿真计算加以验证结论的正确性 这些结果对于汽车及其零部件的碰撞仿真研究具有较大的指导意义 In the practical application of vehicle crash simulation, the calculation accuracy and time are a pair of irreconcilable contradictions, and the division of the grid density has a very significant impact on both. Based on the finite element explicit center difference method, the quantitative The influence of the finite element mesh density on the calculation accuracy is analyzed and the relationship between the calculation efficiency and the mesh density is deduced. The result shows that the mesh is not as fine as possible. Finally, the simulation results of the actual model are correct. These results have great guiding significance for the research of crash simulation of vehicles and their components