Experimental Estimation of FRFs Using the Transmissibility Concept

The dynamic characteristics of a structure are often derived from measured frequency response functions (FRFs). However, it may happen that the measurement of certain FRFs is impossible as they are related to some points of interest that are not physically accessible. In this circumstance, it is useful to have some tools that can provide the prediction of such dynamic information. The transmissibility concept can play an important role to circumvent these situations. In fact, as the authors have shown in a previous work, there are important properties associated to the transmissibility - the relationship between two sets of responses, for a given set of applied forces, extended to a general multiple degree-of-freedom system. The objective of this paper is to demonstrate the potentialities of the transmissibility concept to predict un-measurable FRFs in an actual continuous structure.