车身壁板自由阻尼层稳健性优化设计

在车身壁板自由阻尼层的优化设计中,提出了考虑阻尼材料参数不确定性波动的稳健性优化设计方法。首先,在车身防火墙、地板和顶棚等区域全敷阻尼材料;其次,以等效辐射声功率(ERP)为优化目标对阻尼层布局进行拓扑优化并验证优化效果;最后,以阻尼层厚度为随机设计变量,损耗因子和弹性模量为随机变量,质量最小为优化目标,并结合径向基函数(RBF)近似模型、蒙特卡洛模拟(MCS)和序列二次规划算法(SQP)对阻尼层进行6σ稳健性优化设计。结果表明,优化后车身自由阻尼层的总质量减少了50.45%,并且车身结构噪声性能达到了6σ质量水平,实现了保证车身轻量化要求下的阻尼层稳健性优化的目标。

Robust Optimization Design for Free Damping Layer of Vehicle Body Panel

In the optimization design of the free damping layer of the vehicle body panel,a robust optimization design method considering uncertain fluctuation of damping material parameters is proposed.Firstly,damping materials are full-coated on the body areas such as firewall,floor and ceiling.Secondly,topological optimization of the damping layer layout is carried out taking the equivalent radiated power(ERP)as the optimization objective and the optimization effect is verified.Finally,the six sigma robust optimization design of the damping layer is carried out by taking the thickness of the damping layer as random design variable,the loss factor and elastic modulus as random variables,and the minimum mass as optimization objective,and combining the radial basis function(RBF)approximation model,Monte Carlo simulation(MCS)and sequential quadratic programming(SQP).The results show that the total mass of the free damping layer is reduced by 50.45%after optimization,and the noise performance of the body structure reaches the six sigma quality level,which achieves the goal of robust optimization of the damping layer under the requirement of lightweight body.