中文摘要：

以某重型卡车后驱动桥壳为例,基于Solid Works建立了桥壳的三维参数化模型,运用Workbench对其进行了静力强度、振动模态和疲劳寿命的有限元分析,得出桥壳的应力分布、前5阶固有频率和振型以及疲劳寿命图。有限元分析结果表明：桥壳在刚度和强度上存在较大的裕度。在此基础上,采用目标驱动优化方法,建立了以桥壳质量最小为设计目标,以强度和变形量为约束条件的优化模型,进行了轻量化设计。优化结果显示：桥壳质量减轻了18.03kg,减轻约7.6%,轻量化效果明显。最后对轻量化后的桥壳进行了振动模态、疲劳寿命的有限元验证,以及桥壳的台架试验验证,验证结果共同表明桥壳的轻量化设计是可行的。

英文摘要：

A three -dimensional parametric model of the rear drive axle housing is established based on SolidWorks. The distributions of stress, 1 st to 5 th natural frequencies and fatigue life cloud are obtained by the finite element analysis of drive axle housing with Workbench. Finite element analysis results indicate that drive axle housing has a large margin in stiffness and strength. On this basis, an optimization model is conducted with goal of minimum mass and the constraint of strength and deformation with goal-driven optimization scheme,optimization results indicate： the axle housing weight has fallen to 219.15kgfrom 237.18kg obviously after optimization with reduction of 7.6%. Finally, the finite element analysis results tf the drive axle housing on vibration mode and fatigue life in combination with the bench test results verify that the optimization of drive axle housing is feasible.