Article (Scientific journals)
Comparison of different methodologies for the computation of damped nonlinear normal modes and resonance prediction of systems with non-conservative nonlinearities
Sun, Yekai; Yuan, Jie; Vizzaccaro, Alessandra et al.
2021In Nonlinear Dynamics, 104 (4), p. 3077 - 3107
Peer reviewed
 

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Keywords :
Nonlinear damping; Damped nonlinear normal modes; Nonlinear vibration; Nonlinear modal analysis
Abstract :
[en] The nonlinear modes of a non-conservative nonlinear system are sometimes referred to as damped nonlinear normal modes (dNNMs). Because of the non-conservative characteristics, the dNNMs are no longer periodic. To compute non-periodic dNNMs using classic methods for periodic problems, two concepts have been developed in the last two decades: complex nonlinear mode (CNM) and extended periodic motion concept (EPMC). A critical assessment of these two concepts applied to different types of non-conservative nonlinearities and industrial full-scale structures has not been thoroughly investigated yet. Furthermore, there exist two emerging techniques which aim at predicting the resonant solutions of a nonlinear forced response using the dNNMs: extended energy balance method (E-EBM) and nonlinear modal synthesis (NMS). A detailed assessment between these two techniques has been rarely attempted in the literature. Therefore, in this work, a comprehensive comparison between CNM and EPMC is provided through two illustrative systems and one engineering application. The EPMC with an alternative damping assumption is also derived and compared with the original EPMC and CNM. The advantages and limitations of the CNM and EPMC are critically discussed. In addition, the resonant solutions are predicted based on the dNNMs using both E-EBM and NMS. The accuracies of the predicted resonances are also discussed in detail.
Disciplines :
Mechanical engineering
Author, co-author :
Sun, Yekai
Yuan, Jie
Vizzaccaro, Alessandra
Salles, Loïc  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Vibration of Turbomachines ; Imperial College London > Mechanical Engineering > Vibration University Technology Center
Language :
English
Title :
Comparison of different methodologies for the computation of damped nonlinear normal modes and resonance prediction of systems with non-conservative nonlinearities
Publication date :
2021
Journal title :
Nonlinear Dynamics
ISSN :
0924-090X
eISSN :
1573-269X
Volume :
104
Issue :
4
Pages :
3077 - 3107
Peer reviewed :
Peer reviewed
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