动力总成悬置系统全局稳健设计方法

Global robust design method of powertrain mounting system

针对稳健设计普遍存在的寻优效率低等问题,提出了一种结合全局优化算法与并行计算的稳健设计方法,并将其用于动力总成悬置系统的稳健设计。首先,通过全局搜索确定可行域。然后,应用并行计算完成可行域稳健性评价,从而有效提高了计算效率并降低了设计问题出现反复的可能性。以某动力总成悬置系统为例,采用本文设计方法完成了系统的稳健设计。结果表明,随着不确定水平的升高,稳健设计的必要性和优势越来越明显;模态解耦率标准差的变化幅度远大于平均值,解耦率稳健性的提高主要是通过减小标准差而实现的。

To overcome the problem that the traditional robust design method has low efficiency,a design method,which combines global optimal algorithm and parallel computation,was proposed to perform robust design of powertrain mounting system(PMS).First,the global optimal algorithm was employed to search the feasible region in design space.Then parallel computation was introduced to evaluate robustness of all feasible design points.This method can effectively improve computational efficiency and reduce possibility of repeated design.This method was used to perform robust design of one PMS.Results indicate that,with increasing of uncertainty,robust design becomes a necessary choice and its performance is better than deterministic design.As the standard deviation of modal decoupling ratio has a larger variation compared to its mean value,improvement of its robustness is implemented by decreasing of standard deviation.