Structural Engineering and Mechanics

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A passive vibration isolator with bio-inspired structure and inerter nonlinear effects

  • Jing Bian (School of Civil Engineering, Chongqing University) ;
  • Xu-hong Zhou (School of Civil Engineering, Chongqing University) ;
  • Ke Ke (School of Civil Engineering, Chongqing University) ;
  • Michael CH Yam (Department of Building and Real Estate, The Hong Kong Polytechnic University) ;
  • Yu-hang Wang (School of Civil Engineering, Chongqing University) ;
  • Yue Qiu (Grimwade Centre for Cultural Materials Conservation, School of Historical and Philosophical Studies, Faculty of Arts, The University of Melbourne)
  • Received : 2022.05.08
  • Accepted : 2023.08.17
  • Published : 2023.11.10
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Abstract

This paper developed and examined a novel passive vibration isolator (i.e., "X-inerter") motivated by combining a bio-inspired structure and a rack-pinion inerter. The bio-inspired structure provided nonlinear stiffness and damping owing to its geometric nonlinearity. In addition, the behavior was further enhanced by a gear inerter that produced a special nonlinear inertia effect; thus, an X-inerter was developed. As a result, the X-inerter can achieve both high-static-low-dynamic stiffness (HSLDS) and quasi-zero stiffness (QZS), obtaining ultra-low frequency isolation. Furthermore, the installed inerter can produce a coupled nonlinear inertia and damping effect, leading to an anti-resonance frequency near the resonance, wide isolation region, and low resonance peak. Both static and dynamic analyses of the proposed isolator were conducted and the structural parameters' influence was comprehensively investigated. The X-inerter was proven to be comparatively more stable in the ultra-low frequency than the benchmarking QZS isolator due to the nonlinear damping and inertia properties. Moreover, the inertia effect could suppress the bio-inspired structure's super- and sub-harmonic resonance. Therefore, the X-inerter isolator generally possesses desirable nonlinear stiffness, nonlinear damping, and unique nonlinear inertia, designed to achieve the ultra-low natural frequency, the anti-resonance property, and a wide isolation region with a low resonance peak.

Keywords

Acknowledgement

This research is financially supported by National Natural Science Foundation of China (Grant No. 52178111, 51890902 and) and China Postdoctoral Science Foundation (Grant No. 2022M720576).

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