基于逆子结构法的振源耦合虚拟传递路径分析方法

针对现有传递路径分析(TPA)方法的局限性,根据基于频响函数的逆子结构法,提出一种振源耦合状态下的虚拟传递路径分析方法,并建立了该方法的具体流程.将这方法用于一个模拟动力总成和车身的有限元模型,通过逆子结构法识别振源耦合状态下的子结构及连接件的动态特性,结合子结构综合法合成系统传递函数,实现路径贡献量分析并找到了对系统响应峰值占主要贡献量的传递路径和影响最大的子结构传递函数,验证了该方法准确可行和工程应用简便的特点.

A Novel Visual Transfer Path Analysis Method with Coupled Vibration Source Based on Inverse Substructuring Technique

Due to the limitations of the existing transfer path analysis (TPA) methods, a novel TPA method with coupled vibration source is proposed based on the frequency response function (FRF) based substructuring technique and the detailed process of the method is also proposed. The new method is applied to a simplified finite element model simulating the powertrain and the body of a vehicle. The dynamic characteristics of the substructures and the joints can be identified in coupled condition by the inverse substructuring approach. And then the FRFs of the coupled system can be obtained through the FRFs of the substructures by substructuring approach. Furthermore, the vibration transfer path contribution analysis is carried out and the dominant paths and substructure FRFs are found. The novel method is proved to be feasible and convenient to be applied in the engineering.