动力总成悬置支架的多工况拓扑优化

Topology Optimization of Powertrain Mount Bracket with Multi Load Conditions

为保证车辆低振动噪声和高耐久性等性能,动力总成悬置支架的刚度、模态、应力和质量都必须符合一定要求。采用多工况拓扑优化方法对动力总成悬置支架进行改进设计:选择Optistruct作为拓扑优化工具;以最小加权柔度作为目标函数;以模态>650Hz、应力<120MPa、体积<原体积的80%作为约束函数。优化结果表明,新支架一阶模态高于设定目标值,应力水平小于材料的屈服极限,质量比原支架轻了0.4kg。

The stiffness,mode,stress and weight of the powertrain mount bracket must meet specified requirements in order to assure vehcile＇s high durability and low vibration noise.In this paper,the method of topology optimization with multi load conditions is applied to improve the design of powertrain mount bracket--Optistruct is selected as the topology optimization tool,minimum weighted flexibility is selected as object function,mode 〉650 Hz,strain 〈120 MPa and volume 〈 80 % original volume are selected as constraint function.The optimization results show that one-order mode of new bracket is higher than the setting object value,the stress is smaller than the material yield limit,and the weight is 0.4 kg lithter than the original bracket.