A semi-active negative stiffness dynamic vibration absorber

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 123-128.

XING Zhaoyang1, SHEN Yongjun1,2, XING Haijun1, LI Xianghong3

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Abstract

Introducing negative stiffness into vibration control system can effectively suppress its resonance amplitude, but due to characteristics of negative stiffness, the system’s response in low frequency range can be amplified. Here, in order to improve this situation, the control strategy based on frequency identification was applied in the negative stiffness dynamic vibration absorber, and the short-time Fourier transform was used to do the time-frequency analysis for external excitation signal, track variation of its frequency versus time, and change negative stiffness of the system accordingly. Compared with the existing models under harmonic excitation and non-stationary excitation, it was shown that the proposed model has better low-frequency vibration reduction performance and can attenuate system vibration in the whole frequency domain.

Key words

dynamic vibration absorber / semi-active control / short-time Fourier transform / negative stiffness

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XING Zhaoyang, SHEN Yongjun, XING Haijun, LI Xianghong. A semi-active negative stiffness dynamic vibration absorber[J]. Journal of Vibration and Shock, 2021, 40(15): 123-128

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