A system response prediction approach based on global transmissibilities and its relation with transfer path analysis methods

Abstract

In this paper, a response prediction approach based on global transmissibilities is proposed to improve transfer path analysis (TPA) methods. The method allows predicting the system response when a subsystem becomes connected to the ground using easily measured variables of the original system. It avoids the necessity to perform demounting tests and to measure, or indirectly determine operational forces. The mathematical relationships between the proposed method and TPA methods are derived. Four TPA relations are discussed: the classical TPA relation, the OPA relation, the Advanced TPA relation and the Component-based TPA relation. The advantage of this method is that it estimates the properties of a mechanical system or subsystems using in-situ measurements. These properties are the transmissibility between two sets of responses, the coupled and uncoupled transfer functions between responses and forces. The TPA relationships are validated by numerical and experimental case studies.