基于响应面近似模型的汽车后桥桥壳优化

Optimization of automobile rear axle housing based on response surface approximation model

为进一步提高汽车后桥桥壳的设计强度和疲劳寿命进而提升整车性能,运用多体动力学软件ADAMS建立整车动力学模型,将后桥的三维模型与桥壳材料、单元类型相结合进行有限元网格划分,并针对Bump工况进行ABAQUS有限元静力学分析,然后采用响应面近似模型对汽车后桥桥壳进行优化.结果表明:优化后后桥桥壳在极端工况Bump下的最大应力为45. 76 MPa,相比优化前减少了约10%,疲劳寿命延长了约17%,优化效果明显.

In order to improve the design strength and fatigue life of the automobile rear axle housing and further improve the vehicle performance,ADAMS was used to establish the vehicle dynamics simulation model,finite element mesh generation was made by combining the three-dimensional model of axle housing material and unit type.ABAQUS was used to carry out finite element statics analysis of the automobile rear axle housing according to Bump working condition,and response surface approximation model was used to optimize the automobile rear axle housing.The results showed that the maximum stress of the rear axle shell under extreme conditions of Bump was reduced by about 10%and the fatigue life was prolonged by about 17%.