Theoretical and experimental investigations on semi-active quasi-zero-stiffness dynamic vibration absorber

Chang, Yaopeng; Zhou, Jiaxi; Wang, Kai; Xu, Daolin

doi:10.1016/j.ijmecsci.2021.106892

Cited by 47 publications

(6 citation statements)

References 58 publications

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“…In recent studies, a new curved surface-based vibration isolation mechanism and some mechanical metamaterials with QZS characteristics have obtained full-band vibration isolation under passive vibration isolation (Wang and Wang, 2022; Wu et al, 2020; Zhang et al, 2021), but these QZS isolators have complex structures. Semi-active control and active control are applied to QZS systems to tackle the limitations of the T-QZS isolators in low-frequency vibration isolation without increasing the structural complexity of the QZS systems (Chang et al, 2022; Chen et al, 2022; Sun et al, 2014; Yang et al, 2021). While active control systems provide significant performance gain over passive systems, they demand large power to generate the required force for vibration isolation.…”

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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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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“…Zhao et al [34] refined the three-spring structure by using two pairs of oblique springs instead of one pair in the previous design to increase the quasi-zero stiffness region, thus improving the isolation performance. Other QZS structures [35][36][37][38][39][40][41] have also been developed, for instance, Zhou et al [42] proposed a QZS system based on the mechanism of cam-roller-spring; Liu et al [43] reported a structure that parallels a linear spring with the Euler buckled beams; Shaw et al [44] presented a design consisting of linear springs in parallel with the transverse flexure of a composite bistable plate.…”

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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“…They compared it with an equivalent QZS vibration isolation system. Chang et al [6] examined semi-active quasi-zero-stiffness DVA Theoretically and experimentally. Their results showed the SAQZS DVA enabled vibration absorption at an ultralow frequency, and the anti-resonance frequency for vibration absorption can be tuned effectively.…”

Section: Introductionmentioning

confidence: 99%

Parameters optimization of a nonlinear dynamic absorber for a nonlinear system

Nazari

Rahi

2023

Arch Appl Mech

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One of the important methods to prevent the intensification of the main vibration system is using a dynamic vibration absorber (DVA). A DVA is a mechanical subsystem used to reduce Vibration amplitude and prevent the main vibration system from resonance. This paper aims to use a nonlinear dynamic absorber as a cantilever beam with a concentrated mass at its end to reduce the amplitude of the intensified oscillator vibration. The primary vibration system consists of mass, nonlinear spring, and viscous damping, and a harmonic excitation force is applied to it, resonance the system. In this case, using a nonlinear dynamic absorber reduces the vibration amplitude. For this purpose, first, the kinetic energy and the potential energy of the vibration system are calculated, and then, using Lagrange equations, the governing equations are extracted. Due to the nonlinearity of the equations of motion, the multiple scales method is used to solve the governing equations. In the results, the effect of nonlinear DVA on reducing the amplitude of intensified oscillator vibration is well visible. The effect of the main parameters of nonlinear dynamic absorbers on the vibration amplitude of the initial system is also investigated. Finally, the vibration amplitude of the system is optimized as a target function by the genetic algorithm method, and the optimal parameters of the nonlinear dynamic absorber and the optimal vibration amplitude are studied. Considering the main resonant vibration system as a structure under earthquake, the results of this research in reducing the vibration amplitude can be widely used in earthquake engineering.

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Theoretical and experimental investigations on semi-active quasi-zero-stiffness dynamic vibration absorber

Cited by 47 publications

References 58 publications

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

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

Parameters optimization of a nonlinear dynamic absorber for a nonlinear system

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