刘子建+饶俊威+刘瑜+秦欢

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.

关键词：车身结构静刚度链；主断面；参数化；刚度优化分配

中图分类号：U463.82 文献标志码：A

Fast Calculation for Stiffness Chain of Vehicle-body

Structure Based on Parameters of Main Section

LIU Zijian，RAO Junwei，LIU Yu，QIN Huan

（State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body， Hunan University， Changsha 410082， China）

Abstract：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 single 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 engineering 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 proposed method was verified by a numerical example of a light-weight of vehicle body.

Key words：static stiffness chain of vehicle-body structure； main section； parameterization； stiffness optimum distribution

汽车正向开发流程的车身工程设计阶段分为概念设计和详细设计.概念设计是车身结构设计的前期阶段，任务是为详细设计提供结构可行的方案.车身的整体结构及性能都取决于概念设计的结果，一旦留下设计缺陷，在后续流程中将难以弥补.现代轿车的车身一般采用承载式结构，车身需抵御汽车行驶的复杂载荷，因此，车身的刚度性能尤为重要.车身主断面是分布在车身各个重要位置，用以描述车身结构细节的横截面，它既是控制车身结构和性能的关键点，也是描述车身结构概念设计方案的重要工具.车身主断……