子结构方法是进行汽车侧面碰撞约束系统优化设计的重要手段。该文分析了利用子结构方法进行侧面碰撞约束系统优化设计的流程,采用PAM-CRASH软件建立了整车侧面碰撞仿真模型和子结构仿真计算有限元模型,对约束系统结构参数变化后整车模型和子结构模型的计算结果进行了对比分析。结果表明:子结构模型适用于对填充材料、车门内饰板、车门外形等进行优化分析。该研究对于侧面碰撞仿真中子结构方法的应用具有参考价值。 The substructure method is an important means to optimize the design of the automobile side impact restraint system. This paper analyzes the process of substructure optimization for side impact restraint system. The finite element model of vehicle side impact simulation and substructure simulation is established by using PAM-CRASH software. After the structural parameters of restraint system are changed, Structural model of the results of a comparative analysis. The results show that the substructure model is suitable for the optimization analysis of filling materials, door trim, door profile and so on. This research has reference value for the application of the method of neutron structure in side impact simulation.