Design of magnetic-air hybrid quasi-zero stiffness vibration isolation system

Jiang, Youliang; Song, Chunsheng; Ding, Chenmiao; Xu, Binghui

doi:10.1016/j.jsv.2020.115346

Cited by 65 publications

(27 citation statements)

References 9 publications

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“…Compared to the passive one, the semi-active tunable system could further widen the bandwidth of vibration isolation and improve the isolation performance near the natural frequency. Jiang et al [81] designed a magnetic-air hybrid QZS vibration isolator shown in Fig. 7(e).…”

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: Semi-active Approachmentioning

confidence: 99%

Section: Semi-active Approachmentioning

confidence: 99%

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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“…Inspired by the shape of animal limbs, Zeng et al [19] proposed a QZS isolator with a folded torsional spring structure. Moreover, magnetic springs have been studied by many researchers [20][21][22][23] and have been used to achieve the QZS.…”

Section: Introductionmentioning

confidence: 99%

A quasi-zero-stiffness isolator with a shear-thinning viscous damper

Wen

Lin

2022

Appl. Math. Mech.-Engl. Ed.

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Quasi-zero-stiffness (QZS) vibration isolators have been widely studied, because they show excellent high static and low dynamic stiffnesses and can effectively solve low-frequency and ultralow-frequency vibration. However, traditional QZS (T-QZS) vibration isolators usually adopt linear damping, owing to which achieving good isolation performance at both low and high frequencies is difficult. T-QZS isolators exhibit hardening stiffness characteristics, and their vibration isolation performance is even worse than that of linear vibration isolators under a large excitation amplitude. Therefore, this study proposes a QZS isolator with a shear-thinning viscous damper (SVD) to improve the vibration isolation performance of the T-QZS isolators. The force-velocity relation of the SVD is obtained, and a dynamic model is established for the isolator. The dynamic responses of the system are solved using the harmonic balance method (HBM) and the Runge-Kutta method. The vibration isolation performance of the system is evaluated using force transmissibility, and the isolator parameters are analyzed. The results show that compared with the T-QZS isolators, the proposed QZS-SVD isolator achieves the lower initial vibration isolation frequency and peak value, and exhibits better vibration isolation performance at medium and high frequencies. Moreover, the proposed isolator can withstand a large excitation amplitude in the effective vibration isolation range.

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“…Pu et al [28] arranged the coaxial coils and magnets in multiple layers to expand the adjustable area of negative stiffness. Jiang et al [29] obtained a good isolation effect by connecting the air spring and ES in parallel. In addition, other structures such as a circular ring [30], disc springs [31], a rope structure [32], flexible rods [33], and an X-shaped structure [34] can also obtain QZS characteristics.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Novel Quasi-Zero Stiffness Isolator under Variable Loads

Xie¹,

Niu²,

Sun³

et al. 2022

Mathematical Problems in Engineering

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The designed load of most quasi-zero stiffness (QZS) isolators is constant. The isolation performance will drop sharply once the load changes. A novel QZS isolator that can adapt to variable loads is proposed in this paper to improve the range of application of the isolator. The isolator is designed by paralleling the electromagnetic spring (ES), which provides negative stiffness, and the pneumatic spring (PS), which provides positive stiffness. The positive and negative stiffness can be adjusted by changing the pressure and coil current, which provides the possibility for the isolator to adapt to variable loads. This paper derived the conditions for the isolation system to obtain QZS characteristics, proposed the dynamic model of the isolation system, derived and verified the analytical expressions of the amplitude-frequency response and force transmissibility (FT), and discussed the change of FT and displacement transmissibility(DT) under different loads. Theoretical analysis shows that changing the pressure and coil current in the same proportion can maintain the superior low-frequency isolation performance when the load changes, thanks to the preservation of the QZS characteristics of the system after adjusting the pressure and coil current. Finally, the simulation results fg and isolation frequency band over the linear isolation system and PS isolation system. Furthermore, the proposed isolator can be adjusted online.

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Design of magnetic-air hybrid quasi-zero stiffness vibration isolation system

Cited by 65 publications

References 9 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

A quasi-zero-stiffness isolator with a shear-thinning viscous damper

Design and Analysis of a Novel Quasi-Zero Stiffness Isolator under Variable Loads

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