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When does the method of harmonic balance give a correct prediction for mechanical systems? (English) Zbl 1517.37089

Summary: We investigate the validity of the harmonic balance method for nonlinear, multi-degree-of-freedom mechanical system with time-periodic forcing and linear damping. We provide conditions under which an approximate periodic solution obtained from this method correctly signals the existence of an actual periodic response of the full nonlinear system. These conditions improve classical results from the literature and provide a-priori computable conditions for the validity and accuracy of the harmonic balance method. Our proof is based on Newton’s method in Banach spaces for an appropriately chosen functional. We also derive error bounds for the harmonic balance method and illustrate these on mechanical examples.

MSC:

37M99 Approximation methods and numerical treatment of dynamical systems
49M15 Newton-type methods
70K42 Equilibria and periodic trajectories for nonlinear problems in mechanics

Software:

MATCONT
Full Text: DOI

References:

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