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Smart Structures and Systems
  Volume 31, Number 3, March 2023 , pages 213-227

A novel prismatic-shaped isolation platform with tunable negative stiffness and enhanced quasi-zero stiffness effect
Jing Bian, Xuhong Zhou, Ke Ke, Michael C.H. Yam, Yuhang Wang, Zi Gu and Miaojun Sun

    A passive prismatic-shaped isolation platform (PIP) is proposed to realize enhanced quasi-zero stiffness (QZS) effect. The design concept uses a horizontal spring to produce a tunable negative stiffness and installs oblique springs inside the cells of the prismatic structure to provide a tunable positive stiffness. Therefore, the QZS effect can be achieved by combining the negative stiffness and the positive stiffness. To this aim, firstly, the mathematical modeling and the static analysis are conducted to demonstrate this idea and provide the design basis. Further, with the parametric study and the optimal design of the PIP, the enhanced QZS effect is achieved with widened QZS range and stable property. Moreover, the dynamic analysis is conducted to investigate the vibration isolation performance of the proposed PIP. The analysis results show that the widened QZS property can be achieved with the optimal designed structural parameters, and the proposed PIP has an excellent vibration isolation performance in the ultra-low frequency due to the enlarged QZS range. Compared with the traditional QZS isolator, the PIP shows better performance with a broader isolation frequency range and stable property under the large excitation amplitude.
Key Words
    negative stiffness; quasi-zero stiffness; ultra-low frequency; vibration isolation
(1) Jing Bian, Xuhong Zhou, Ke Ke, Yuhang Wang:
School of Civil Engineering, Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, China;
(2) Michael C.H. Yam:
Department of Building and Real Estate, Chinese National Engineering Research Centre for Steel Construction, The Hong Kong Polytechnic University, Hong Kong, China;
(3) Zi Gu:
Department of Civil Engineering, Hunan University, Hunan, China;
(4) Miaojun Sun:
Powerchina Huadong Engineering Corporation Limited, Hangzhou 310014, China;
(5) Miaojun Sun:
Zhejiang Engineering Research Center of Marine Geotechnical Investigation Technology and Equipment, Hangzhou 310014, China.

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