Numerical and experimental analysis of a vibration isolator equipped with a negative stiffness system

Palomares, E.; Nieto, A.J.; Morales, A.L.; Chicharro, J.M.; Pintado, P.

doi:10.1016/j.jsv.2017.11.006

Cited by 86 publications

(44 citation statements)

References 24 publications

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“…where γ λ λ = − ( ) ( ) 1 2 . Figure 2 depicts the curves of the exact restoring force given by equation (6) and approximated one defined by equation (8).…”

Section: Force and Stiffness Characteristicsmentioning

confidence: 99%

“…The quasi-zero stiffness (QZS) vibration isolators have attracted the attention of many scholars in the past 10 years because of their great performance in isolating low-frequency vibration and bearing high load. 1,2 Alabuzhev et al 3 put forward some vibration protecting systems with quasi-zero stiffness long ago and gave the design method. In their monograph, it was shown that the QZS vibration isolator can be implemented by combining the linear vibration isolator with stiffness corrector which can provide negative stiffness in the direction of load movement.…”

Section: Introductionmentioning

confidence: 99%

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Beneficial performance of a quasi-zero stiffness vibration isolator with generalized geometric nonlinear damping

Cheng

2020

Noise & Vibration Worldwide

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Generalized geometric nonlinear damping based on the viscous damper with a non-negative velocity exponent is proposed to improve the isolation performance of a quasi-zero stiffness (QZS) vibration isolator in this paper. Firstly, the generalized geometric nonlinear damping characteristic is derived. Then, the amplitude-frequency responses of the QZS vibration isolator under force and base excitations are obtained, respectively, using the averaging method. Parametric analysis of the force and displacement transmissibility is conducted subsequently. At last, two phenomena are explained from the viewpoint of the equivalent damping ratio. The results show that decreasing the velocity exponent of the horizontal damper is beneficial to reduce the force transmissibility in the resonant region. For the case of base excitation, it is beneficial to select a smaller velocity exponent only when the nonlinear damping ratio is relatively large.

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“…where γ λ λ = − ( ) ( ) 1 2 . Figure 2 depicts the curves of the exact restoring force given by equation (6) and approximated one defined by equation (8).…”

Section: Force and Stiffness Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beneficial performance of a quasi-zero stiffness vibration isolator with generalized geometric nonlinear damping

Cheng

2020

Noise & Vibration Worldwide

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“…However, it is usually necessary to increase the stiffness of the isolator to maintain its stability when the mass of the payload increases. Negative-stiffness vibration isolators are isolators that use various kinds of restoring force, whether passive , semi-active [22][23][24][25][26][27][28], or active [29,30], to produce negative-stiffness characteristics, thus partially counteracting the positive stiffness within a micro-vibration stroke. And they have shown effective to produce high-static-low-dynamic stiffness characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Semi-active negative stiffness vibration isolators were proposed to realize the variable stiffness characteristic and to cope with the variation of excitation frequency or system parameters. Palomares [22] used linear pneumatic actuators instead of inclined springs to obtain adjustable negative stiffness, and the natural frequency was reduced by up to 58%. Christopher [23] proposed a fast and effective dynamically tunable stiffness structure using piezoelectric actuators.…”

Section: Introductionmentioning

confidence: 99%

Improving Low Frequency Isolation Performance of Optical Platforms Using Electromagnetic Active-Negative-Stiffness Method

et al. 2020

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To improve the low-frequency isolation performance of optical platforms, an electromagnetic active-negative-stiffness generator (EANSG) was proposed, using nano-resolution laser interferometry sensors to monitor the micro-vibration of an optical platform, and precision electromagnetic actuators integrated with a relative displacement feedback strategy to counteract the positive stiffness of pneumatic springs within a micro-vibration stroke, thereby producing high-static-low-dynamic stiffness characteristics. The effectiveness of the method was verified by both theoretical and experimental analyses. The experimental results show that the vertical natural frequency of the optical platform was reduced from 2.00 to 1.37 Hz, the root mean square of displacement was reduced from 1.28 to 0.69 μm, and the root mean square of velocity was reduced from 14.60 to 9.33 μm/s, proving that the proposed method can effectively enhance the low frequency isolation performance of optical platforms.

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“…It is a known fact that reducing the stiffness will result in a larger static deformation of the mass and degrade the stability of the isolator. 3,4 Thus, the means to achieve efficient isolation in low or ultra-low frequency band is a task in the subject of linear vibration isolation. Owing to the serious ranges of disturbances we have in real engineering application such as earthquakes and shocks in which the components of the disturbances contain low frequency, the condition for vibration isolation has become increasingly rigorous.…”

Section: Introductionmentioning

confidence: 99%

Vibration isolation using a bar and an Euler beam as negative stiffness for vehicle seat comfort

Oyelade

2019

Advances in Mechanical Engineering

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In this article, the behavior and the efficiency of a nonlinear passive vibration isolator based on a bar and an Euler beam are investigated analytically. The proposed isolator is specifically for isolating vehicle seat from unwanted disturbances in the low frequency range, thereby making the seat comfortable for the driver. The static characteristics of the negative stiffness as well as the nonlinear mathematical model are presented, and its dynamic characteristics are investigated using the harmonic balance method. In addition, the effect of the initial geometric imperfection of the Euler beam is included in the study. The study shows that the performance of the negative isolator has a large isolation frequency range than that of the linear isolator. The configuration parameter choice for the seat base will be vital for the suitable application of this isolator.

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Numerical and experimental analysis of a vibration isolator equipped with a negative stiffness system

Cited by 86 publications

References 24 publications

Beneficial performance of a quasi-zero stiffness vibration isolator with generalized geometric nonlinear damping

Beneficial performance of a quasi-zero stiffness vibration isolator with generalized geometric nonlinear damping

Improving Low Frequency Isolation Performance of Optical Platforms Using Electromagnetic Active-Negative-Stiffness Method

Vibration isolation using a bar and an Euler beam as negative stiffness for vehicle seat comfort

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