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Computation of quasi-periodic localised vibrations in nonlinear cyclic and symmetric structures using harmonic balance methods
Publikationstyp
Journal Article
Date Issued
2019-01-06
Sprache
English
Institut
TORE-URI
Journal
Volume
438
Start Page
54
End Page
65
Citation
Journal of Sound and Vibration (438): 54-65 (2019-01-06)
Publisher DOI
Scopus ID
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.