Article (Scientific journals)
Dark solitons, modulation instability and breathers in a chain of weakly nonlinear oscillators with cyclic symmetry
Fontanela, F.; Grolet, A.; Salles, Loïc et al.
2018In Journal of Sound and Vibration, 413, p. 467 - 481
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Keywords :
Breathers; Cyclic structures; Solitons; Vibration localisation; Localisation; Modulation instabilities; Non-linear phenomena; Nonlinear evolution equation; Nonlinear modulation; Undamped oscillators; Condensed Matter Physics; Mechanics of Materials; Acoustics and Ultrasonics; Mechanical Engineering; Nonlinear Sciences - Pattern Formation and Solitons
Abstract :
[en] In the aerospace industry the trend for light-weight structures and the resulting complex dynamic behaviours currently challenge vibration engineers. In many cases, these light-weight structures deviate from linear behaviour, and complex nonlinear phenomena can be expected. We consider a cyclically symmetric system of coupled weakly nonlinear undamped oscillators that could be considered a minimal model for different cyclic and symmetric aerospace structures experiencing large deformations. The focus is on localised vibrations that arise from wave envelope modulation of travelling waves. For the defocussing parameter range of the approximative nonlinear evolution equation, we show the possible existence of dark solitons and discuss their characteristics. For the focussing parameter range, we characterise modulation instability and illustrate corresponding nonlinear breather dynamics. Furthermore, we show that for stronger nonlinearity or randomness in initial conditions, transient breather-type dynamics and decay into bright solitons appear. The findings suggest that significant vibration localisation may arise due to mechanisms of nonlinear modulation dynamics.
Disciplines :
Mechanical engineering
Author, co-author :
Fontanela, F.;  Department of Mechanical Engineering, Imperial College London, London, United Kingdom
Grolet, A.;  Department of Mechanical Engineering, Arts et Métiers ParisTech, Lille, France
Salles, Loïc  ;  Université de Liège - ULiège > Aérospatiale et Mécanique (A&M) ; Department of Mechanical Engineering, Imperial College London, London, United Kingdom
Chabchoub, A.;  Department of Mechanical Engineering, Aalto University, Aalto, Finland ; School of Civil Engineering, The University of Sydney, Sydney, Australia
Hoffmann, N.;  Department of Mechanical Engineering, Imperial College London, London, United Kingdom ; Department of Mechanical Engineering, Hamburg University of Technology, Hamburg, Germany
Language :
English
Title :
Dark solitons, modulation instability and breathers in a chain of weakly nonlinear oscillators with cyclic symmetry
Publication date :
20 January 2018
Journal title :
Journal of Sound and Vibration
ISSN :
0022-460X
eISSN :
1095-8568
Publisher :
Academic Press
Volume :
413
Pages :
467 - 481
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
Funding text :
The first author thanks the financial support provided by the Brazilian agency  CNPq (project number 01339/2015-3 ). Appendix A
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