Large stroke quasi-zero stiffness vibration isolator using three-link mechanism

Yan, Ge; Zou, Hong‐Xiang; Wang, Sen; Zhao, Lingmin; Gao, Qiu‐Hua; Tan, Ting; Zhang, Wenming

doi:10.1016/j.jsv.2020.115344

Cited by 124 publications

(22 citation statements)

References 40 publications

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“…e system is excited at its base (the casing) by an imposed displacement y, as illustrated in Figure 1(b), so that the suspended mass can oscillate inside its casing. A viscous damper c is introduced as a generic dissipative term, which is a practical assumption validated by some recent experimental works on similar suspension configurations [17][18][19]. e relative displacement between the mass and the casing is indicated by z, so that when z = 0 the mass is located at the centre of the casing.…”

Section: Force-deflection Characteristicmentioning

confidence: 99%

“…In this paper, a softening-hardening behaviour is achieved by simply arranging linear springs in an X-shaped mechanical configuration, realizing a quasi-zero stiffness effect for large deflections. Following the preliminary idea presented in [16], a series of research works have recently addressed its exploitation to develop innovative vibration isolators [17][18][19], and it is believed that such characteristic may be of interest to other applications, so that it is further studied in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Parameters on the Design of a Suspension System with Four Oblique Springs

Gatti

2021

Shock and Vibration

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This paper presents the fundamental static and dynamic characteristics of a suspension system consisting of four linear springs arranged in an X-shaped configuration to achieve geometric nonlinearity. The particular interest is towards the design of a softening spring geometry realizing a quasi-zero stiffness behaviour at large deflections, and the influence of the system parameters is investigated. The static performance is studied in terms of the force-deflection curve and the dynamic performance in terms of the frequency response curve. The softening-hardening behaviour of the suspension leads to a frequency response which bends to the lower frequencies reaching a well-defined minimum. It is found that both the static and dynamic behaviours may be described in terms of a single parameter, and a simple closed-form expression is determined which links the damping in the system to the excitation amplitude to achieve the lowest possible resonance frequency.

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Section: Force-deflection Characteristicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Parameters on the Design of a Suspension System with Four Oblique Springs

Gatti

2021

Shock and Vibration

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“…The numerical solution of the Runge-Kutta method (RKM) [30] is used to verify the accuracy of the HBM, and the parameter of vibration isolation system is selected as: m = 0.529 kg; ζ = 0.3; k 1 = 33.9376; k 2 = 76.0736; k 3 = 6723.2; Λ = 0.05 m/s 2 ; ω = 7.262 Hz. The analytical and numerical results of the vibration isolation system are shown in Figure 9, and the approximate analytical solution obtained by the HBM agrees well with the numerical solution obtained by the RKM.…”

Section: Modelingmentioning

confidence: 99%

Post-Buckling Spring Vibration Isolator Using Silicone Gel Column: A Theoretical and Experimental Study

Yang

Han

et al. 2021

Applied Sciences

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Based on the design of a post-buckling silicone gel column (SGC), a novel type of low-frequency vibration isolator is presented, and the vibration isolation performance of this isolator is studied by combining theoretical analysis and experimental verification. The stiffness characteristics of the post-buckling SGC are derived, and its recovery force curves with different parameters are analyzed using two kinds of elliptic integral functions. Displacement transmissibility is formulated using harmonic balance method (HBM), and the influences of the excitation amplitude, damping ratio, SGC section diameter, and Young’s modulus are discussed in terms of the transmissibility. The performance of the SGC system is verified through a series of experimental studies based on the developed experimental prototype. The result shows that the proposed post-buckling spring vibration isolator has a good vibration isolation effect, especially in the low-frequency domain, which may provide a feasible novel design idea for a low-frequency vibration isolator.

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“…Zhao et al [9][10][11] proposed new limb-like QZS systems with two pairs and three pairs of oblique springs to enlarge the QZS range and isolation frequency band. Similarly, Yan et al [12] proposed a large stroke QZS vibration isolator using a three-link mechanism, which is less sensitive to vibration amplitude than the traditional QZS isolator.…”

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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Large stroke quasi-zero stiffness vibration isolator using three-link mechanism

Cited by 124 publications

References 40 publications

Effect of Parameters on the Design of a Suspension System with Four Oblique Springs

Effect of Parameters on the Design of a Suspension System with Four Oblique Springs

Post-Buckling Spring Vibration Isolator Using Silicone Gel Column: A Theoretical and Experimental Study

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

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