本文根据汽车车架结构的特点,应用薄壁杆系有限单元法,对汽车车架的固有频率和主振型进行了计算。由于计算中考虑了约束扭转的影响并采用了一致质量矩阵的方案,因而降低了对计算机容量的要求。在国产TQ-16机上进行了计算,达到了较高的计算精度。这为今后进一步开展汽车振动的研究,包括动态响应的分析、整车结构的模态综台技术以及汽车舒适性等方面的研究打下了基础。 According to the characteristics of automobile frame structure, the finite element method of thin-walled pole is applied to calculate the natural frequency and main vibration mode of automobile frame. Due to computational considerations of the effect of constraint twisting and the adoption of a consistent quality matrix approach, the requirement for computer capacity is reduced. Calculated on the domestic TQ-16 machine, reaching a higher accuracy. This laid the foundation for further research on vehicle vibration in the future, including the analysis of dynamic response, the modal integrated platform technology of vehicle structure and the car comfort.