Abstract: As the influence of uncertainty factors such as manufacturing error of suspension stiffness on PMSs, a reliable design flow was proposed to perform reliable design of PMS. Variations  of reliability were analyzed under different design states. Analysis results of deterministic design was used to show necessity of enhancing reliability of systems. A three-step flow, including performing, choosing and decision was proposed to perform reliable design of a PMS. Finally, this flow was used to perform reliable design of one PMS. Results indicate that a reasonable decision contributes to commonly enhance system reliability. In some cases, a continuously stable region may be found in feasible field at multiple levels of uncertainties, this is an ideal result and it also shows effectiveness of the proposed design flow.

Key words: powertrain mounting system(PMS), decoupling design, deterministic design, reliable design, choosing and decision

摘要： 针对悬置刚度的制造误差等不确定因素对系统性能的影响，提出了一种适用于动力总成悬置系统的可靠设计流程，并将其用于某悬置系统的可靠设计。分析了悬置系统在不同设计状态下的可靠度变化，通过对确定设计结果的分析指出了提高系统可靠度的必要性，提出了一种用于悬置系统可靠设计的规划—筛选—决策3步设计流程。以某动力总成悬置系统为例，采用所提出的可靠设计流程完成了系统的可靠设计。结果表明，制定合理的决策标准有助于筛选出能普遍提高系统可靠度的设计方案，甚至能够在可行域中找到在多个不确定性水平下均能保持稳定可靠的区域，而这正是可靠设计的理想结果，也反映了所提出的可靠设计流程是有效的。

关键词: 动力总成悬置系统, 解耦设计, 确定设计, 可靠设计, 筛选决策