A real-time controllable electromagnetic vibration isolator based on magnetorheological elastomer with quasi-zero stiffness characteristic

Liu, Shaogang; Feng, Lifeng; Zhao, Dan; Shi, Xinxin; Zhang, Yapeng; Jiang, Junxiang; Zhao, Yue; Zhang, Chunjie; Lu, Chenyu

doi:10.1088/1361-665x/ab2e44

Cited by 39 publications

(9 citation statements)

References 32 publications

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“…In addition, the AHSLD isolator presents relative more hardening nonlinearity when it is adjusted to the lower stiffness condition. The quasi-zero stiffness nonlinear oscillator to achieve real-time controllable quasi-zero stiffness is proposed by Shaogang Liu et al in [12]. Negative stiffness is produced by comprising of two electromagnets with MR elastomer and the experimental results confirms this isolator has a wider frequency region for vibration attenuation than the corresponding linear isolator with the active control of stiffness.…”

Section: Introductionmentioning

confidence: 98%

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Danh

2021

Jurnal POLIMESIN

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As well known, nonlinear vibration isolation models may offer potential effectiveness for isolating low frequency vibrations. Therefore, this paper will introduce a nonlinear vibration isolation model, featuring asymmetrical and quasi-zero stiffness characteristics. Firstly, the physical model of the nonlinear vibration oscillation is shown, including a semicircular cam-roller and wedge-roller mechanism, in which cylinder adding auxiliary tank is worked as an elastic element. Secondly, its dynamic stiffness is built and numerically simulated. Based on these, the parameters which effect on dynamic stiffness of the system are identified. The analysis results confirmed that the proposed model can attain the quasi-zero stiffness by adjusting the pressure inside the cylinder of the stiffness corrected stiffness. Moreover, increasing the auxiliary tank volume will decrease the asymmetry of the stiffness curve. This study will furnish a useful insight to analyze and design a quasi-zero stiffness vibration isolator.

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Section: Introductionmentioning

confidence: 98%

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Danh

2021

Jurnal POLIMESIN

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“…The semi-active control based on MRE is rarely studied in the QZS system. Liu et al (2019) recently proposed a real-time controllable electromagnetic vibration isolator based on magnetorheological elastomer with QZS characteristics.…”

Section: Introductionmentioning

confidence: 99%

A semi-active quasi-zero stiffness vibration isolator based on magnetorheological elastomer with a fast convergence switch control

Lin

Wen

2023

Journal of Intelligent Material Systems and Structures

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Quasi-zero stiffness (QZS) isolators have attracted extensive attention due to their high-static–low-dynamic stiffness. The effectiveness of the traditional QZS (T-QZS) isolators to attenuate low-frequency vibration has been extensively studied. The T-QZS isolator, however, cannot usually provide satisfactory vibration mitigation performance under ultra-low frequency excitation. To tackle this challenge, we propose a semi-active QZS isolator featuring magnetorheological elastomer (SAQZS-MRE isolator). The prominent merit of the proposed design is that the applied MRE material can provide varying stiffness and damping to the proposed SAQZS-MRE isolator, making the isolator suitable for vibration isolation under wide-band low-frequency range. The dynamic viscoelasticity properties of the MRE are experimentally characterized, to formulate the dynamic modeling of the SAQZS-MRE isolator. The open-loop vibration isolation characteristics of the SAQZS-MRE isolator are assessed using the harmonic balance method (HBM). Subsequently, two semi-active control strategies including skyhook and fast convergence switch (FCS) are effectively utilized in the proposed SAQZS-MRE isolator to evaluate their closed-loop performance. The results demonstrate that the SAQZS-MRE isolator with FCS control can eliminate the resonance peak and reduce the initial isolation frequency. In the higher frequency range, it can also improve the vibration isolation performance compared with the SAQZS-MRE isolator with passive control.

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“…As one of the vibration isolation devices, the quasi-zero stiffness (QZS) isolation system has received much research attention [22][23][24][25][26][27][28][29]. The pioneer book of Alabuzhev et al [30], which was published in 1980, systematically introduced the vibration protecting system with QZS characteristics.…”

Section: Introductionmentioning

confidence: 99%

A new magnetorheological quasi-zero stiffness vibration isolation system with large zero stiffness range and highly stable characteristics

Deng

Sun

et al. 2023

Preprint

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Various quasi-zero stiffness (QZS) systems have been developed and applied in the vibration control domain in recent years. However, most QZS systems are usually unstable against external disturbances, and the QZS ranges of them are very limited. To address the above issues, this study develops a highly stable QZS vibration isolation system integrated with magnetorheological fluids (MRFs). The MRFs endow the vibration isolation system with stiffness variability in vertical and lateral directions against external disturbances, which innovatively solves the unstable problem of the QZS system. Meanwhile, the stiffness variability also makes the system adaptable to vibrations with different frequencies, so the system can deliver the best vibration isolation performance in response to various excitations. The system consists of a vertical isolation unit and a lateral isolation unit. Through paralleling a nonlinear positive stiffness QZS component with a nonlinear negative stiffness QZS component in the vertical isolation unit, a large QZS range in the vertical direction and smaller stiffness are realised, thus improving the vibration isolation performance. In this study, the vibration isolation system is designed and prototyped; its QZS characteristics and adjustable stiffness features in both the vertical and lateral directions are experimentally verified; the frequency responses of the system are obtained experimentally; the stability and the vibration isolation performance of the system are also evaluated by experiments. This study provides a solution to overcome the unstable problem of QZS systems and extend the limited QZS range, whilst realising QZS characteristics in both vertical and lateral directions, thus broadening the application of QZS systems.

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A real-time controllable electromagnetic vibration isolator based on magnetorheological elastomer with quasi-zero stiffness characteristic

Cited by 39 publications

References 32 publications

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A semi-active quasi-zero stiffness vibration isolator based on magnetorheological elastomer with a fast convergence switch control

A new magnetorheological quasi-zero stiffness vibration isolation system with large zero stiffness range and highly stable characteristics

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