A bistable nonlinear energy sink conceived to mitigate the vibrations of host structural systems is considered in this paper. The hosting structure consists of two coupled symmetric linear oscillators (LOs), and the nonlinear energy sink (NES) is connected to one of them. The peculiar nonlinear dynamics of the resulting three-degree-of-freedom system is analytically described by means of its slow invariant manifold derived from a suitable rescaling, coupled with a harmonic balance procedure, applied to the governing equations transformed in modal coordinates. On the basis of the first-order reduced model, the absorber is tuned and optimized to mitigate both modes for a broad range of impulsive load magnitudes applied to the LOs. On the one hand, for low-amplitude, in-well, oscillations, the parameters governing the bistable NES are tuned in order to make it functioning as a linear tuned mass damper (TMD); on the other, for high-amplitude, cross-well, oscillations, the absorber is optimized on the basis of the invariant manifolds features. The analytically predicted performance of the resulting tuned bistable nonlinear energy sink (TBNES) is numerically validated in terms of dissipation time; the absorption capabilities are eventually compared with either aTMD and a purely cubic NES. It is shown that, for a wide range of impulse amplitudes, the TBNES allows the most efficient absorption even for the detuned mode, where a single TMD cannot be effective.

The tuned bistable nonlinear energy sink / Habib, Giuseppe; Romeo, Francesco. - In: NONLINEAR DYNAMICS. - ISSN 0924-090X. - STAMPA. - 89:1(2017), pp. 179-196. [10.1007/s11071-017-3444-y]

The tuned bistable nonlinear energy sink

HABIB, Giuseppe;ROMEO, Francesco
2017

Abstract

A bistable nonlinear energy sink conceived to mitigate the vibrations of host structural systems is considered in this paper. The hosting structure consists of two coupled symmetric linear oscillators (LOs), and the nonlinear energy sink (NES) is connected to one of them. The peculiar nonlinear dynamics of the resulting three-degree-of-freedom system is analytically described by means of its slow invariant manifold derived from a suitable rescaling, coupled with a harmonic balance procedure, applied to the governing equations transformed in modal coordinates. On the basis of the first-order reduced model, the absorber is tuned and optimized to mitigate both modes for a broad range of impulsive load magnitudes applied to the LOs. On the one hand, for low-amplitude, in-well, oscillations, the parameters governing the bistable NES are tuned in order to make it functioning as a linear tuned mass damper (TMD); on the other, for high-amplitude, cross-well, oscillations, the absorber is optimized on the basis of the invariant manifolds features. The analytically predicted performance of the resulting tuned bistable nonlinear energy sink (TBNES) is numerically validated in terms of dissipation time; the absorption capabilities are eventually compared with either aTMD and a purely cubic NES. It is shown that, for a wide range of impulse amplitudes, the TBNES allows the most efficient absorption even for the detuned mode, where a single TMD cannot be effective.
2017
Bistable vibration absorber; Invariant manifold; Nonlinear energy sink; Nonlinear vibration absorber; Tuned mass damper; Control and Systems Engineering; Aerospace Engineering; Ocean Engineering; Mechanical Engineering; Applied Mathematics; Electrical and Electronic Engineering
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The tuned bistable nonlinear energy sink / Habib, Giuseppe; Romeo, Francesco. - In: NONLINEAR DYNAMICS. - ISSN 0924-090X. - STAMPA. - 89:1(2017), pp. 179-196. [10.1007/s11071-017-3444-y]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/979198
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