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Smart Structures and Systems Volume 27, Number 3, March 2021 , pages 525-536 DOI: https://doi.org/10.12989/sss.2021.27.3.525 |
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Analysis and optimization of a typical quasi-zero stiffness vibration isolator |
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Huan Li, Yang Yu, Jianchun Li and Yancheng Li
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| Abstract | ||
| To isolate vibration at a low-frequency range and at the same time to provide sufficient loading support to the isolated structure impose a challenge in vibration isolation. Quasi-zero stiffness (QZS) vibration isolator, as a potential solution to the challenge, has been widely investigated due to its unique property of high-static & low-dynamic stiffness. This paper provides an in-depth analysis and potential optimization of a typical QZS vibration isolator to illustrate the complexity and importance of design optimization. By carefully examining the governing fundamentals of the QZS vibration isolator, a simplified approximation of force and stiffness relationship is derived to enable the characteristic analysis of the QZS vibration isolator. The explicit formulae of the amplitude-frequency response (AFR) and transmissibility of the QZS vibration isolator are obtained by employing the Harmonic Balance Method. The transmissibility curves under force excitation with different values of nonlinear coefficient, damping ratio, and amplitude of excitation are further investigated. As the result, an optimization of the structural parameter has been demonstrated using a comprehensive objective function with considering multiple dynamic characteristic parameters simultaneously. Finally, the genetic algorithm (GA) is adopted to minimise the objective function to obtain the optimal stiffness ratios under different conditions. General recommendations are provided and discussed in the end. | ||
| Key Words | ||
| quasi-zero stiffness; vibration isolation; dynamic characteristics optimization; genetic algorithm | ||
| Address | ||
| (1) Huan Li, Yang Yu, Jianchun Li, Yancheng Li: School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo 2007, Australia; (2) Jianchun Li: Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin, 300384, China; (3) Yancheng Li: College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China. | ||