Constant QZS isolator based on the negative stiffness mechanism of two pairs of oblique bars

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 52-59.

ZHAO Feng1,2，HUO Yaqi1，CHEN Lumin1，DU Wenliao1，CAO Shuqian2，FENG Guizhen3

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Abstract

There exists problem that the dynamic stiffness of QZS isolators increases when the loaded mass deviates from the static equilibrium position, which influences the performance of vibration isolation at low frequency. A novelty constant QZS isolator is proposed herein based on the negative stiffness mechanism of two pairs of oblique bars. The force and stiffness expressions are derived. The QZS conditions are derived by considering that stiffness and its second order derivation are equal to zero at the static equilibrium position. The parameter conditions of nonlinear stiffness, constant QZS and zero stiffness are determined via discussing the influence of parameters on stiffness features. According to the static analysis, a constant QZS prototype is designed and tested for force-displacement curves, which shows better accordance with theoretical prediction. Furtherly, the constant QZS prototype and the corresponding linear isolator are tested by using laser vibrometer to respectively obtain their displacement responses and transmissibility. The dynamic experiment results show that the transmissibility of the constant QZS isolator is wholly lower than that of the corresponding linear isolator, the initial frequency of vibration isolation of the constant QZS isolator is less than 1.5 Hz but 4.5 Hz for the corresponding linear isolator. In summary, the proposed constant QZS isolator not only can realize any value of constant QZS but also can be conveniently fabricated by using ordinary bars and springs, which presents superior performance of vibration isolation at low frequency.

Key words

Quasi-zero stiffness / Vibration isolator / Displacement transmissibility / Two pairs of oblique bars / Experiments

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ZHAO Feng1,2，HUO Yaqi1，CHEN Lumin1，DU Wenliao1，CAO Shuqian2，FENG Guizhen3. Constant QZS isolator based on the negative stiffness mechanism of two pairs of oblique bars[J]. Journal of Vibration and Shock, 2024, 43(2): 52-59

References

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