On the use of transmissibility rneasurements for finite element model updating

Conventional finite element updating techniques make use of measured frequency response functions and modal
parameter estimates to update the FE model parameters. This paper presents a new technique to update the FE model
from output-only transmissibility measurements assuming the location of the excitation force is known. A transmissibility
function is defined as the ratio between two (measured) responses. In general, the poles that are identified from
transmissibility measurements do not correspond with the systems poles. It can be proven that the peaks of the
transmissibility function coincide with the modal frequencies of the system with the excitation degree of freedom
constrained. The effectiveness of the proposed procedure will be illustrated by means of a case study.