中文摘要：

在刚度链计算模型中直接利用真实主断面参数快速求解，是车身结构刚度链设计方法必须解决的关键问题．在建立和完善轿车车身弯曲静刚度链计算模型的基础上，以刚度链节点参数可控和工程化为目标，建立了刚度链节点参数与主断面截面属性参数的对应关系，研究了利用极坐标法控制真实主断面形状的参数化方法，以及由单一变量控制的复杂截面属性计算方法，实现了刚度链节点属性的参数化计算和刚度链模型计算参数的工程化，为基于真实主断面结构形状的车身静刚度优化分配研究打下了基础．最后用一个车身轻量化优化计算实例验证了研究方法的可行性．

英文摘要：

The fast calculation of stiffness chain model by directly using the parameters of real main section is the key problem which should be solved in the design of vehicle-body stiffness chain. Taking the control and engineering on the parameters of stiffness chain nodes as the target, this paper evaluated the relationship between the parameters of stiffness chain nodes and the parameters of main section property. Furthermore, the parameterized method of controlling the real shape of the main section was studied by using the polar coordinate method and computing method of complex section properties that considers sin- gle variable control theory based on an established and improved computing model for static stiffness chain of vehicle body. It achieves the targets of parameterized calculation for the stiffness chain nodes and the en- gineering for the parameters in stiffness chain model, which provides a foundation for the investigation on the optimal distribution of static stiffness based on real main section structure and shape. Finally, the pro- posed method was verified by a numerical example of a light-weight of vehicle body.