摘要
传统的悬置系统分析建立在刚性基础的假设之上,忽略了动力总成与车身、轮胎的耦合作用。建立了包括车身及车轮在内的13自由度动力总成-整车耦合模型,通过模态试验验证了模型的准确性。针对新的耦合系统模型提出了广义解耦率概念,描述动力总成和车身、车身和车轮之间的能量解耦,同时还提出了用来评价动力悬置系统性能的怠速工况、启停工况、路面激励工况。采用新的模型及评价方法对某MPV车型的动力悬置系统进行分析,并采用NSGA-II多目标遗传算法对悬置刚度进行优化。实车试验结果显示,优化后的车内乘员耳边噪声得到有效改善。
A traditional powertrain mounting model is constructed based on tire rigidity assumption, which ignored tire coupling effect between the body and wheels. This paper firstly built a 13 DOF rigid model for the powertrain mounting system including the body and wheels and the effectiveness of this model was further verified through modal tests. Secondly, the concept of generalized decoupling rate was established for this novel coupled system and was used to describe the effect of decoupled energy between the powertrain and body and between the body and wheels. Thirdly, three kinds of driving conditions including idling, key-off/ on, and road excitation were applied to assess the performance of the powertrain mounting system. Finally, the proposed method was employed to analyze a MPV＇ s powertrain mounting system, and by optimizing the mount stiffness througb the multi-objective genetic algorithm （NSGA-II）, the acoustic pressure response of the driver＇s ear is improved.
出处
《汽车工程学报》
2017年第5期357-367,共11页
Chinese Journal of Automotive Engineering
基金
湖南大学汽车车身先进设计制造国家重点实验室自主研究课题(31175002)
重庆理工大学汽车零部件教育部重点实验室2014年开放课题(2014KLMT04)
柳州市柳东新区科学技术研究与技术开发计划项目(柳东科攻20130301)
