On the usefulness of antiresonances in structural dynamics

Resumo

In this paper a study focusing the zeros of frequency response functions (FRFs) of linear mechanical systems is presented. Two major aspects are focused: the underlying theory, including a physical interpretation of the zeros of both transfer and driving point FRFs in terms of structural modifications, and the possibility of practical exploration of the FRF in some structural dynamics applications, namely: finite element updating, structural damage identification and vibration attenuation using dynamic vibration absorbers. After presentation of the theory, some results of applications performed on both numerically simulated and experimental mechanical systems are presented o illustrate the practical use of the zeros.