Iterative finite element model updating in the time domain

An iterative time domain formulation for finite element model updating in structural dynamics is presented. The approach is supported on a derivation showing that the discrepancy between observations and model predictions can be expressed as a convolution between the state of the system and a sequence of pseudo-Markov parameters which are linear in the change of the free parameters. The approach is illustrated by updating all the stiffness and damping parameters of a twenty degree of freedom shear beam using four noise contaminated measurements.

► Finite element model updating in the time domain. ► The proposed method is capable of updating stiffness and damping parameters. ► High ratio of updatable parameters to number of measurements. ► Robustness against measurement noise. ► Low correlation between estimation errors of multiple parameters.