Updating model parameters from frequency domain data via reduced order models

Abstract

Methods to update the parameters of finite element models using measured vibration data usually use the experimentally derived modal model, that is the system natural frequencies, damping coefficients and mode shapes. The frequency response functions have been used directly to update condensed analytical models and so avoid the sometimes difficult step of deriving the modal model. This paper suggests algorithms to update selected physical parameters of a full finite element model using the frequency response functions. These algorithms are tested on a simulated example.