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A two degree of freedom stable quasi-zero stiffness prototype and its applications in aseismic engineering

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Abstract

In this paper, an archetypal aseismic system is proposed with 2-degree of freedom based on a smooth and discontinuous (SD) oscillator to avoid the failure of electric power system under the complex excitation of seismic waves. This model comprises two vibration isolation units for the orthogonal horizontal directions, and each of them admits the stable quasi-zero stiffness (SQZS) with a pair of inclined linear elastic springs. The equation of motion is formulated by using Lagrange equation, and the SQZS condition is obtained by optimizing the parameters of the system. The analysis shows that the system behaves a remarkable vibration isolation performance with low resonant frequency and a large stroke of SQZS interval. The experimental investigations are carried out to show a high sonsistency with the theoretical results, which demonstrates the improvement of aseismic behavior of the proposed model under the seismic wave.

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Authors and Affiliations

  1. School of Astronautics, Harbin Institute of Technology, Harbin, 150001, China

    GuangNan Zhu, JiYe Liu & QingJie Cao

  2. China Electric Power Research Institute, Beijing, 100055, China

    YongFeng Cheng, ZhiCheng Lu & ZhuBing Zhu

Authors
  1. GuangNan Zhu
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  2. JiYe Liu
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  3. QingJie Cao
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  4. YongFeng Cheng
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  5. ZhiCheng Lu
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  6. ZhuBing Zhu
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Corresponding author

Correspondence to QingJie Cao.

Additional information

The first three authors acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 11572096, 11732006).

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Zhu, G., Liu, J., Cao, Q. et al. A two degree of freedom stable quasi-zero stiffness prototype and its applications in aseismic engineering. Sci. China Technol. Sci. 63, 496–505 (2020). https://doi.org/10.1007/s11431-018-9524-2

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  • DOI: https://doi.org/10.1007/s11431-018-9524-2

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