Publisher DOI: 10.1016/j.jsv.2018.09.002
Title: Computation of quasi-periodic localised vibrations in nonlinear cyclic and symmetric structures using harmonic balance methods
Language: English
Authors: Fontanela, F. 
Grolet, A. 
Salles, L. 
Hoffmann, N.  
Issue Date: 6-Jan-2019
Source: Journal of Sound and Vibration (438): 54-65 (2019-01-06)
Journal or Series Name: Journal of sound and vibration 
Abstract (english): In this paper we develop a fully numerical approach to compute quasi-periodic vibrations bifurcating from nonlinear periodic states in cyclic and symmetric structures. The focus is on localised oscillations arising from modulationally unstable travelling waves induced by strong external excitations. The computational strategy is based on the periodic and quasi-periodic harmonic balance methods together with an arc-length continuation scheme. Due to the presence of multiple localised states, a new method to switch from periodic to quasi-periodic states is proposed. The algorithm is applied to two different minimal models for bladed disks vibrating in large amplitudes regimes. In the first case, each sector of the bladed disk is modelled by a single degree of freedom, while in the second application a second degree of freedom is included to account for the disk inertia. In both cases the algorithm has identified and tracked multiple quasi-periodic localised states travelling around the structure in the form of dissipative solitons. © 2018 Elsevier Ltd
URI: http://hdl.handle.net/11420/2336
ISSN: 0022-460X
Institute: Strukturdynamik M-14 
Type: (wissenschaftlicher) Artikel
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