Vibration reduction efficiency and damping connection type of multi-scale series nonlinear energy sinks

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (10) : 147-153.

CHEN Jian’en，ZHANG Weixing，LIU Jun，GE Weimin

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Abstract

The vibration reduction efficiencies of series nonlinear energy sinks with decreasing parameters under impact and sweep excitations are studied, and the effect of damping grounded type on the vibration reduction efficiency is analyzed. The efficiencies of the series NESs are compared with those of the single-degree-of-freedom NESs. The non-dimensional dynamic equations of the systems are derived and the effects of each purely cubic oscillator in the two series NESs on the energy dissipation are analyzed by numerical method. The results show that, when the excitation amplitude is relatively low, the NESs with ungrounded damping are more effective than the NESs with grounded damping, and the grounded series NES has a significant advantage when the system is imposed in a wide range of excitation amplitude. In addition, the energy dissipation of each purely cubic oscillator varies with the increase of the excitation amplitudes, and the lightest third oscillator dissipates the most energy.

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Nonlinear energy sink / vibration control / impact / sweep excitation / grounded damping

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CHEN Jian’en，ZHANG Weixing，LIU Jun，GE Weimin. Vibration reduction efficiency and damping connection type of multi-scale series nonlinear energy sinks[J]. Journal of Vibration and Shock, 2022, 41(10): 147-153

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