多连杆式后悬架系统整体强度分析

Strength analysis of integrated multi-link rear suspension system

有限元法在汽车悬架系统结构件的强度分析中应用广泛,但大多仅针对单个零件进行强度校核,由于系统各部件间是运动关系,载荷及边界条件难以精确确定,对计算结果的准确性造成影响。以某轿车多连杆式后悬系统为例,提出悬架系统整体结构有限元强度分析方法,并以后轴焊接总成在悬架系统中的分析结果与单件分析的结果进行对比,比较其结果的差异性。研究结果表明,由于单件分析连接位置采用固定约束,受到的载荷为集中载荷,导致单件分析的应力水平过高;而系统整体强度分析考虑到各部件间的运动关系,其准确度相对较高。

Finite element method is widely used in the structural analysis of vehicle suspension ,but the vast majority of applications are limited to individual parts analysis . Boundary conditions and loading are difficult to define because of mutual movement between each component ,affecting the accuracy of the calculation results .The paper ,taking an automobile multi-link rear suspension as an example ,presents a strength analysis method of integrated suspension system .Compared with the result of rear axle welding assemble in the suspension system ,it analyzes the single unit and studies the differences .The results show that the stress level of a single piece is too high because of connection position with fixed constrains and by mostly concentrated load .The overall analysis system can fully consider the movement of each component , so the accuracy of the results is relatively high .This method is important for the design and development of suspension system .