Title
Operational modal analysis of time varying systems using an exogenous multi-sine excitation Operational modal analysis of time varying systems using an exogenous multi-sine excitation
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
conferenceObject
Publication
[*]
Subject
Engineering sciences. Technology
Source (book)
International Conference on Noise and Vibration Engineering (ISMA2006), September 18-20, 2006, Louvain, Belgium
ISBN
978-90-73802-83-4
ISI
000246669504046
Carrier
E
Target language
English (eng)
Abstract
A basic assumption when using modal analysis parameter identification procedures is that the structure under test is time invariant. In many practical structural dynamics applications, however, these assumptions are violated (because either the boundary conditions or the structural parameters change in time). In this paper we will introduce a new and simple method to estimate the modal parameters of a system together with their variation in time during the experiment. The method uses measurements of a structure under operational excitation combined with an exogenous multi-sine excitation. The initial modal parameters of the structure are identified from the operational response signals and the time variation is estimated by tracking the amplitude of the force and the response related to the exogenous multi-sine excitation. The method will be validated on a computer simulation and on three experimental cases: (a) a water tank with a decreasing water volume coupled on a beam, (b) a cracked U-profile and (c) a scale-model airplane placed in a wind tunnel.
E-info
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