A multiple-input multiple-output smoothing technique: Theory and application to aircraft data

The aim of the research described in this article is to propose a technique for curve-fitting a modal model to frequency response functions (FRFs) in order to deal with multi-input multi-output (MIMO) systems with highly coup led modes, usually encountered in vibration testing. This new formulation p ermits a global model for the structure under test to be determined by esti mating directly at the first step both poles and participation factors. Res ults related to numerical simulations and to the analysis of experimental d ata measured on an aircraft before performing a flight-flutter test complet e the article. (C) 2001 Academic Press.