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 coupled modes, usually encountered in vibration testing. This new formulation permits a global model for the structure under test to be determined by estimating directly at the first step both poles and participation factors. Results related to numerical simulations and to the analysis of experimental data measured on an aircraft before performing a flight-flutter test complete the article.