Article (Scientific journals)
A two-harmonic homotopy method to experimentally uncover isolated resonances
Raze, Ghislain; Kerschen, Gaëtan
2025In Mechanical Systems and Signal Processing, 232, p. 112670
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Keywords :
Nonlinear vibration testing; Secondary resonance; Two-harmonic forcing; Simultaneous resonance; Isola; Homotopy
Abstract :
[en] Secondary resonances of nonlinear systems may appear as isolated branches of solutions, challenging their characterization and making them particularly difficult to observe experimentally. This work exploits a two-harmonic homotopy method that leverages two-harmonic forcing as a proxy to connect primary and secondary resonances. An experimental implementation with simple feedback controllers is presented. This approach is then validated with an electronic Duffing oscillator and a doubly clamped beam featuring a distributed geometrical nonlinearity. It is shown to experimentally uncover isolas in both of these examples.
Disciplines :
Aerospace & aeronautics engineering
Mechanical engineering
Author, co-author :
Raze, Ghislain  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
A two-harmonic homotopy method to experimentally uncover isolated resonances
Publication date :
June 2025
Journal title :
Mechanical Systems and Signal Processing
ISSN :
0888-3270
eISSN :
1096-1216
Publisher :
Elsevier
Volume :
232
Pages :
112670
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
Ghislain Raze is a Postdoctoral Researcher of the Fonds de la Recherche Scientifique - FNRS which is gratefully acknowledged.
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since 12 April 2025

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