• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (5): 157-168.doi: 10.3901/JME.2024.05.157

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Dynamic Characteristics of a Two-stage Quasi-zero-stiffness Vibration Isolation System with Electromagnetic Shunt Damping

MA Zhaozhao1,2, ZHOU Ruiping1, YANG Qingchao3, LEE Heow Pueh2, CHAI Kai3   

  1. 1. School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063;
    2. Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore;
    3. College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033
  • Received:2023-04-14 Revised:2023-11-28 Online:2024-03-05 Published:2024-05-30

Abstract: Two-stage quasi-zero-stiffness vibration isolator (TQZS VI) can effectively suppress low-frequency vibrations and quickly attenuate high-frequency vibrations. An electromagnetic shunt damping (ESD) has also been proven to be a feasible way to harvest energy from vibrating structures. By integrating the TQZS VI and the ESD, a novel TQZS VI that realizes dual functions of vibration control and energy harvesting is proposed. Both layers of quasi-zero-stiffness are achieved by a vertical spring connected in parallel with two symmetrical transverse springs, and electromagnetic shunt damping as a viscous dissipative element between the upper and lower layers is provided by an ESD connected to an external resonant resistance-capacitance-inductance (RCI) series circuit. First, the mechanical and mathematical models of the two-stage quasi-zero-stiffness vibration isolator with electromagnetic shunt damping (ESD-TQZS VI) are established. Then, the amplitude-frequency response equation of the ESD-TQZS VI is solved using the harmonic balance method (HBM) and the arc length continuation method. Moreover, the force transmissibility and output power of the ESD-TQZS VI are defined, and the effects of system parameters on vibration isolation and energy harvesting are analyzed. It is found that a sizeable damping ratio is beneficial for attenuating resonance peaks while having a negligible effect on energy harvesting. Significant shunt resistance is not conducive to attenuating resonant peaks and can narrow the isolation frequency band of the system. Finally, the bifurcation and attractor coexistence characteristics of the ESD-TQZS VI system after parameter optimization are revealed. The results indicate that the ESD-TQZS VI can considerably attenuate resonance peaks of low-frequency vibration and achieve vibration energy harvesting at the same time.

Key words: quasi-zero-stiffness, two-stage vibration isolation, low-frequency vibration, energy harvesting, electromagnetic shunt damping

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