Performance analysis of a quasi-zero stiffness vibration isolation system with scissor-like structures
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O R I G I NA L
Wei Zou · Chun Cheng
· Ran Ma · Yan Hu · Weiping Wang
Performance analysis of a quasi-zero stiffness vibration isolation system with scissor-like structures
Received: 22 April 2020 / Accepted: 18 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To isolate low-frequency vibration, a novel single-degree-of-freedom vibration isolation system with quasi-zero stiffness (QZS) and nonlinear damping using geometric nonlinearity is proposed in this study. One of the remarkable features of this system is the use of scissor-like structures (SLSs) to achieve the nonlinear stiffness and damping. The length difference between the connecting rods in SLS is considered. First, both the stiffness and damping characteristics are derived and analyzed in detail. Then, the frequency response and force transmissibility are obtained using the harmonic balance method. Finally, the effects of structural parameters on the isolation performance are investigated. Theoretical results show that the proposed QZS vibration system can not only isolate low-frequency vibration but also suppress the high-amplitude vibration in the resonant region. Besides, increasing nonlinear damping has little influence on the isolation performance in high frequencies. The proposed QZS vibration system can outperform a classical counterpart. Keywords Vibration isolation · Quasi-zero stiffness · Geometric nonlinearity · Nonlinear damping 1 Introduction Vibrations exist everywhere in engineering applications such as construction machinery, aerospace, vehicles, and precision equipment. High-amplitude vibration could result in disastrous accidents [1]. Moreover, how to isolate low-frequency vibration effectively is a challenging research hot spot. Vibrations can be generally suppressed by applying passive vibration isolators, absorbers [2], or active control methods [3–5]. Compared with other techniques, passive vibration isolators are more widely used in engineering because of high reliability and low cost. However, linear vibration isolators have a common dilemma that decreasing the natural frequency can lead to the reduction of bearing capacity. Therefore, it is necessary to design nonlinear vibration isolators that can isolate the low-frequency vibration effectively. The design of quasi-zero stiffness (QZS) vibration isolator has always been the focus of research [6]. The QZS vibration isolators are generally obtained by combining the linear vibration isolator with the negative stiffness corrector (NSC) which is used to produce the negative stiffness in the direction of vibration isolation using a geometric relationship [7]. The positive stiffness can be counteracted by the negative one, which can result in zero stiffness at the equilibrium position by designing appropriate structural parameters. Therefore, a high-static-low-dynamic stiffness (HSLDS) is obtained, which can make sure that the vibration isolator has a small static deflection and a low natural frequency simultaneously [8]. There are various NSCs to r
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