基于逆子结构法的振源耦合虚拟传递路径分析方法

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

摘要:

传递路径分析方法是当前诊断机械系统振动和噪声最通用的手段。针对现有TPA方法的局限性,本文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。

关键词:传递路径分析;频响函数 逆子结构法;振源耦合

Abstract:

Transfer path analysis is now the most common tool in noise and vibration diagnosis of a mechanical system. In order to avoid the limitations of the existing TPA methods, a novel transfer path analysis method is proposed base on the FRF(frequency response function)-based substructure dynamic characteristic identification theory. It is applied to a simplified finite element model used to simulate the powertrain and the body of a car. The dynamic characteristics of the substructures in free state and the joint properties are obtained in coupled condition by a spectral-based inverse substructuring approach. And then the coupled system behavior can be described in terms of the free substructure FRFs and coupling dynamic stiffness by FRF-based substructuring approach. Thus, vibration path contribution analysis is carried out and the dominant paths and substructure FRFs are identified.

Key words:transfer path analysis; frequency response function; inverse substructuring method; coupled vibration source