基于振动能量分布的模态振型识别及频率继承性分析

Modal shape identification based on kinetic-energy distribution and relevance ratio research

在商用车振动系统中,对乘坐舒适性影响最大的是驾驶室悬置和前后主悬架。这两个参数对整车模态频率的分布起着关键的作用。为了研究整车频率分布与两者的关系,本文在整车多体动力学振动模型的基础上,分别建立驾驶室隔振系统模型和悬上质量(驾驶室和车架)隔振系统模型,并且提出以振动能量分布来识别振型的方法,确定整车振动系统中各阶模态来源。最后提出频率继承率的概念,并以此评价识别出的对应模态间联系的密切程度。模态来源与频率继承率将为后续的优化改进提供重要参考。

In commercial vehicle vibration system, the body suspension and main suspension have great impact on the ride comfort. The two parameters critically influence the distribution of vehicle ＇ s modal frequencies. To study the relevance between these two parameters and vehicle＇ s modal frequency＇ s distribution, body suspension vibration model and suspended mass （body and frame） vibration model are built respectively based on the multi -body dynamics vibration model of complete vehicle in ADAMS/view. In order to discern the source of each modal frequency in complete vehicle vibration system, a new method based on kinetic - energy distribution is proposed. And to evaluate the relevance between two relative modes, the concept of relevance ratio is put forward. The modal source and the relevance ratio would serve for the future improvement as an import reference.