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Experimental modal analysis of a beam travelled by a moving mass using Hilbert Vibration Decomposition
Bertha, Mathieu; Golinval, Jean-Claude
2014
 

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Keywords :
Modal identification; Time-varying systems; Hilbert transform; Instantaneous frequency
Abstract :
[en] In this paper the problem of modal identification of time-varying system is investigated. To do so, a technique based on the sifting process of the Hilbert Vibration Decomposition (HVD) method is presented. The key idea is to estimate the instantaneous frequency of the dominant mode, to extract its corresponding component by demodulation of the recorded signals and then to iterate with the subsequent dominant mode. In the case of multiple recorded signals, a source separation method is used as a preprocessing step to facilitate the identification of the instantaneous frequency for the following demodulation step. To illustrate the method, an experimental set-up consisting in a beam travelled by a non negligible mass is considered. The whole structure is randomly excited during the travel of the mass and some responses on the beam are recorded.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Bertha, Mathieu ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Golinval, Jean-Claude  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Language :
English
Title :
Experimental modal analysis of a beam travelled by a moving mass using Hilbert Vibration Decomposition
Publication date :
July 2014
Event name :
9th International Conference on Structural Dynamics, EURODYN 2014
Event place :
Porto, Portugal
Event date :
30 June - 2 July 2014
Audience :
International
Available on ORBi :
since 02 September 2014

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