Affiliations: Departamento de Engenharia Mecânica e Industrial,
Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516
Caparica, Portugal | Department of Mechanical Engineering, Instituto
Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais,
1049-001 Lisboa, Portugal
Abstract: When deriving an experimental model from Frequency Response
Functions (FRFs), it may happen that the measurement of certain FRFs is
impossible. This may be an important issue, mainly in the field of condition
monitoring and damage detection, since some points of interest may become
inaccessible in operational conditions. In this circumstance, it is useful to
have some tools that can provide the prediction of such dynamic information.
The transmissibility concept, extended to a general multiple degree-of-freedom
system, can play an important role to circumvent these situations. The authors
have shown in previous works that the estimation of such FRFs can be made
possible by invoking important properties associated with the transmissibility
function. The objective of this work is to evaluate different sets of FRFs,
estimated by using the transmissibility concept and its associated properties,
in an actual continuous structure to which different patterns of structural
modification are applied. A supplementary study in this work shows that some of
the sets for applied forces/known responses can better estimate the FRF data.
Keywords: Transmissibility, structural modification, Frequency Response Functions
