Abstract
For a strongly non-linear multi-degree-of-freedom system, in general, one cannot consider one mode at a time as in linear modal analysis. In the absence of external excitation, the natural vibration often involves more than one mode at a time resulting in quasi-periodic or multi-periodic (toroidal) vibration. The normal multi-mode in free vibration have been formulated by means of the action-angle transformation and the resulting ordinary differential equations embedded in partial differential equations. Final multi-periodic solutions have been obtained by extending the newly developed Toeplitz Jacobian matrix method with multi-periodic fast Fourier transforms.
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