Research and Analysis of Quasi-Zero-Stiffness Isolator with Geometric Nonlinear Damping

Meng, Qing; Yang, Xuefeng; Li, Wei; Lu, En; Sheng, Lianchao

doi:10.1155/2017/6719054

Cited by 20 publications

(16 citation statements)

References 17 publications

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“…With these two precompressed coil springs, a negative stiffness can be got in vertical direction but cannot be adjusted as there is no adjustment mechanism. A similar negative stiffness device realized by using the mechanical coil spring was presented by Meng et al [7]. Besides, another way to achieve negative stiffness is utilizing structure buckling phenomena.…”

Section: Introductionmentioning

confidence: 85%

A New Approach to Achieve Variable Negative Stiffness by Using an Electromagnetic Asymmetric Tooth Structure

Han

Liu

et al. 2018

Shock and Vibration

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Traditional passive nonlinear isolators have been paid much attention in recent literatures due to their excellent performance compared to linear vibration isolators. However, they are incapable of dealing with varying conditions such as changing excitation frequency due to the nonadjustable negative stiffness. To solve this drawback, a new approach to achieve variable negative stiffness is proposed in this paper. The negative stiffness is realized by an electromagnetic asymmetric magnetic tooth structure and can be changed by adjusting the magnitude of the input direct current. Analytical model of the electromagnetic force is built and simulations of magnetic field are conducted to validate the negative stiffness. Then the EATS is applied to vibration isolation and an electromagnetic vibration isolator is designed. Finally, a series of tests are conducted to measure the negative stiffness experimentally and confirm the effect of the EATS in vibration isolation.

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Section: Introductionmentioning

confidence: 85%

A New Approach to Achieve Variable Negative Stiffness by Using an Electromagnetic Asymmetric Tooth Structure

Han

Liu

et al. 2018

Shock and Vibration

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“…Figure 5(a) shows the restoring force property obtained from equations (5) and (2). Figure 5(b) shows the stiffness property obtained from equations (6) and (3). It is clear that the result of the Taylor expansion coincides with that of the original expression when the displacement is small, so the Taylor expansion in (5) and (6) is able to respect the quasi-zero stiffness property of the isolator.…”

Section: Static Analysis Of a Mechanical Systemmentioning

confidence: 99%

Research on a nonlinear quasi-zero stiffness vibration isolator with a vibration absorber

Liu

Ding

2020

Science Progress

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A negative stiffness mechanism consisting of a spring and cylinder is proposed, and a grounded dynamic vibration absorber is designed based on a quasi-zero stiffness vibration isolator to constitute the vibration isolator with a vibration absorber system. The range of parameters for attaining zero stiffness is derived from static analysis. The dynamic analysis of the vibration isolator with a vibration absorber system is carried out by a multiscale method, and the amplitude–frequency response equation of the system is obtained. The influence of different system parameters on the amplitude–frequency response is analyzed. The amplitude–frequency response of the quasi-zero stiffness vibration isolator is compared with that of the vibration isolator with a vibration absorber, and the linear and nonlinear analytical solutions of the vibration isolator with a vibration absorber system are also compared. The results show that the designed vibration isolator with a vibration absorber is an ideal choice for low-frequency vibration isolation, with no large resonance peak throughout the system and significantly improved reliability of the system.

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“…In recent years, QZS vibration isolation has become a research hotspot because of its large bearing capacity and extremely low natural frequency, which can effectively isolate low frequencies. It has various forms, such as cam roller [4][5][6], oblique spring [7][8][9], disk spring combined with vertical linear springs [10], circular ring [11], magnet [12], inert elements [13], X-shaped structure [14], strut structure [15,16], and other structural forms [17][18][19][20]. And some researchers studied the resonance response of nonlinear vibration [21] and the damping characteristics [22].…”

Section: Introductionmentioning

confidence: 99%

Design and Research of Semiactive Quasi‐Zero Stiffness Vibration Isolation System for Vehicles

Feng

Zhao

2021

Shock and Vibration

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The vehicle-mounted equipment is easy to be disturbed by external vibration excitations during transportation, which is harmful to the measurement accuracy and performance of the equipment. Aiming at the vibration isolation of the vehicle-mounted equipment, a semiactively controlled quasi-zero stiffness (QZS) vibration isolator with positive and negative stiffness is proposed. The vertical spring is paralleled with a magnetorheological (MR) damper, and the semiactive on-off control scheme is adopted to control the vibration. The analytical expression of the isolator’s displacement transmissibility is derived via the averaging method. Then, the vibration isolation performance under different road excitations and different driving speeds is simulated and compared with the uncontrolled passive QZS vibration isolator. In addition, the mechanical structure of the semiactive QZS isolator is designed and manufactured, and the test system is built by LabVIEW software and PXI embedded system. The isolation effect of the semiactive QZS isolator is verified through test data. It is found that the proposed semiactive QZS isolator shows excellent vibration isolation performance under various road excitations, while the passive QZS isolator is effective only under harmonic excitations. The vertical acceleration of vehicle-mounted device can be decreased over 70% after isolation, and the vibration isolation effect is remarkable. The design idea and research results of the semiactive QZS isolator may provide theoretical guidance and engineering reference for vibration isolation.

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Research and Analysis of Quasi-Zero-Stiffness Isolator with Geometric Nonlinear Damping

Cited by 20 publications

References 17 publications

A New Approach to Achieve Variable Negative Stiffness by Using an Electromagnetic Asymmetric Tooth Structure

A New Approach to Achieve Variable Negative Stiffness by Using an Electromagnetic Asymmetric Tooth Structure

Research on a nonlinear quasi-zero stiffness vibration isolator with a vibration absorber

Design and Research of Semiactive Quasi‐Zero Stiffness Vibration Isolation System for Vehicles

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