High-Static–Low-Dynamic Stiffness Isolator With Tunable Electromagnetic Mechanism

Sun, Yi; Zhao, Jinglei; Wang, Min; Sun, Yuwen; Pu, Huayan; Luo, Jun; Peng, Yan; Xie, Shaorong; Yang, Yi

doi:10.1109/tmech.2019.2954910

Cited by 64 publications

(12 citation statements)

References 31 publications

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“…(III) Active approach to tuning the working range of QZS isolators Early in 2010, a tunable method has been proposed to improve the isolation performance [77] . In recent several years, many researchers used current control method to tune or adjust the working range of QZS or HSLDS vibration isolators [79][80]86,88] . This method has advantages of easy to implement and control; however, the robust under complex condition is still a challenge.…”

Section: Discussionmentioning

confidence: 99%

“…The negative stiffness was generated by the electromagnetic force between the coils and the magnets and could be tuned online by controlling the current. Then, Sun et al [80] proposed an HSLDS isolator with tunable electromagnetic mechanisms as shown in Fig. 7(d), where the stiffness could be tuned by regulating the current.…”

Section: Semi-active Approachmentioning

confidence: 99%

“…-Fig. 7 Tunable semi-active QZS isolators with electromagnetics: (a) tunable HSLDS isolator with a magnetic spring and a pair of electromagnetics [77] , (b) tunable vibration isolator consisting of ring magnets and electromagnetic coils [78] , (c) multi-layer electromagnetic spring with tunable negative stiffness [79] , (d) HSLDS isolator with tunable electromagnetic mechanisms [80] , and (e) magnetic-air hybrid QZS vibration isolator [81] (color online)…”

Section: Semi-active Approachmentioning

confidence: 99%

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A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

Yan

Chen

2022

Appl. Math. Mech.-Engl. Ed.

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Vibration isolation is one of the most efficient approaches to protecting host structures from harmful vibrations, especially in aerospace, mechanical, and architectural engineering, etc. Traditional linear vibration isolation is hard to meet the requirements of the loading capacity and isolation band simultaneously, which limits further engineering application, especially in the low-frequency range. In recent twenty years, the nonlinear vibration isolation technology has been widely investigated to broaden the vibration isolation band by exploiting beneficial nonlinearities. One of the most widely studied objects is the “three-spring” configured quasi-zero-stiffness (QZS) vibration isolator, which can realize the negative stiffness and high-static-low-dynamic stiffness (HSLDS) characteristics. The nonlinear vibration isolation with QZS can overcome the drawbacks of the linear one to achieve a better broadband vibration isolation performance. Due to the characteristics of fast response, strong stroke, nonlinearities, easy control, and low-cost, the nonlinear vibration with electromagnetic mechanisms has attracted attention. In this review, we focus on the basic theory, design methodology, nonlinear damping mechanism, and active control of electromagnetic QZS vibration isolators. Furthermore, we provide perspectives for further studies with electromagnetic devices to realize high-efficiency vibration isolation.

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Section: Discussionmentioning

confidence: 99%

Section: Semi-active Approachmentioning

confidence: 99%

Section: Semi-active Approachmentioning

confidence: 99%

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A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

Yan

Chen

2022

Appl. Math. Mech.-Engl. Ed.

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“…Stiffness control is one of the key unit technologies of a vibration isolation system [ 9 , 10 , 11 , 12 ]. If the positive and negative stiffness mechanisms are combined reasonably, the system characteristics such as zero stiffness and infinite stiffness can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimentation of a Self-Sensing Actuator for Active Vibration Isolation System with Adjustable Anti-Resonance Frequency Controller

Liu

et al. 2021

Sensors

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The vibration isolation system is now indispensable to high-precision instruments and equipment, which can provide a low vibration environment to ensure performance. However, the disturbance with variable frequency poses a challenge to the vibration isolation system, resulting in precision reduction of dynamic modeling. This paper presents a velocity self-sensing method and experimental verification of a vibration isolation system. A self-sensing actuator is designed to isolate the vibration with varying frequencies according to the dynamic vibration absorber structure. The mechanical structure of the actuator is illustrated, and the dynamic model is derived. Then a self-sensing method is proposed to adjust the anti-resonance frequency of the system without velocity sensors, which can also reduce the complexity of the system and prevent the disturbance transmitting along the cables. The self-sensing controller is constructed to track the variable frequency of the disturbance. A prototype of the isolation system equipped with velocity sensors is developed for the experiment. The experiment results show that the closed-loop transmissibility is less than −5 dB in the whole frequency rand and is less than −40 dB around, adding anti-resonance frequency which can be adjusted from 0 Hz to initial anti-resonance frequency. The disturbance amplitude of the payload can be suppressed to 10%.

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“…Besides, typical oblique coiled springs were used to provide negative stiffness. Some other forms of negative stiffness structure are proposed and studied, such as disk spring [20,21], notched flexure [22], magnetic spring [23][24][25], Euler buckled beam [26][27][28], cam roller spring [29][30][31], scissor-like structure [32][33][34], and other novel structures [35][36][37]. Different negative stiffness elements have their advantages.…”

Section: Introductionmentioning

confidence: 99%

An Improved Structural Analysis Method for Isolator with Quasi‐Zero‐Stiffness Characteristic

Zhang

et al. 2021

Shock and Vibration

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A typical quasi-zero-stiffness (QZS) vibration isolator consisting of a vertical spring and two oblique springs has been widely researched on its static and dynamic characteristics. A general criterion for determining structural parameters of QZS isolator is to achieve low nondimensional stiffness around the equilibrium position. However, lower nondimensional stiffness of linear isolator means lower isolation frequency, which may be invalid on QZS isolator. Because there is an implicit relationship between geometric parameter and stiffness ratio of QZS isolator, this study presents an improved optimization criterion for determining the optimal structural parameters of the typical QZS isolator. The optimization criterion is that the QZS isolator has the maximum displacement range around the equilibrium position without exceeding given natural frequency, rather than given nondimensional stiffness. The results show that isolator with these optimal parameters can achieve lower stiffness around the equilibrium position and better vibration isolation performance. Furthermore, an extended QZS isolator consisting of vertical spring with fixed stiffness and prestressed oblique springs is discussed to further improve stiffness characteristic. Better stiffness performance can be obtained when the prestressed oblique springs have softening stiffness and the exponent of the nonlinear stiffness is 2. Considering the existence of friction in practical application, the influence of friction on both static and dynamic characteristics is investigated. The analysis reveals that friction has little influence on its stiffness characteristic around the static equilibrium position and friction damping produced by friction affects the response amplitude and resonant frequency in dynamics.

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High-Static–Low-Dynamic Stiffness Isolator With Tunable Electromagnetic Mechanism

Cited by 64 publications

References 31 publications

A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

Design and Experimentation of a Self-Sensing Actuator for Active Vibration Isolation System with Adjustable Anti-Resonance Frequency Controller

An Improved Structural Analysis Method for Isolator with Quasi‐Zero‐Stiffness Characteristic

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