A multi-directional vibration isolator based on Quasi-Zero-Stiffness structure and time-delayed active control

Xu, Jian; Sun, Xiuting

doi:10.1016/j.ijmecsci.2015.06.015

Cited by 80 publications

(17 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Naeeni et al [24] investigated the application of QZS isolators in vibration pickups, a vibration pickups by using of vibration isolation principle of QZS, and the experimental results showed that the QZS isolator pickups has better performance than the linear isolator pickups even if there are physical and geometric errors. Besides, some achievements are obtained mainly focusing on control methodology based on the QZS isolation system [25].…”

Section: Introductionmentioning

confidence: 99%

Design, Experiment, and Improvement of a Quasi-Zero-Stiffness Vibration Isolation System

et al. 2020

View full text Add to dashboard Cite

This paper proposes a new kind of quasi-zero-stiffness (QZS) isolation system that has the property of low-dynamic but high-static stiffness. The negative stiffness was produced using two magnetic rings, the magnetization of which is axial. First, the force–displacement characteristic of the two coupled magnetic rings was developed and the relationship between the parameters of the magnetic rings and the stiffness of the system was investigated. Then, the dynamic response of the QZS was analyzed. The force transmissibility of the system was calculated and the effects of the damping ratio and excitation amplitude on the isolation performance were investigated. The prototype of the QZS system was developed to verify the isolation effects of the system based on a comparison with a linear vibration isolation platform. Lastly, the improvement of the QZS system was conducted based on changing the heights of the ring magnets and designing a proper non-linear spring. The analysis shows the QZS system after improvement shows better isolation effects than that of the non-improved system.

show abstract

Section: Introductionmentioning

confidence: 99%

Design, Experiment, and Improvement of a Quasi-Zero-Stiffness Vibration Isolation System

et al. 2020

View full text Add to dashboard Cite

show abstract

“…One way to improve low-frequency vibration isolation without having excessive static deflection is to use a nonlinear isolator [1]. A simple way to model this type of isolator is to combine lateral linear springs with a linear (vertical) spring orthogonal to the lateral springs [2-5], resulting in an isolator that has high-static-low-dynamic-stiffness (HSLDS), and many studies have shown there are many ways to achieve this characteristic [1, [6][7][8][9][10][11]. Recently, this concept has been further developed as a two-stage isolator [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

High-static-low-dynamic-stiffness vibration isolation enhanced by damping nonlinearity

Brennan

Ding

2018

Sci. China Technol. Sci.

View full text Add to dashboard Cite

High-static-low-dynamic-stiffness (HSLDS) nonlinear isolators have proven to have an advantage over linear isolators, because HSLDS nonlinear isolators allow low-frequency vibration isolation without compromising the static stiffness. Previously, these isolators have generally been assumed to have linear viscous damping, degrading the performance of the isolator at high frequencies. An alternative is to use nonlinear damping, where the nonlinear behavior is achieved by configuring linear dampers so they are orthogonally aligned to the excitation direction. This report compares the performances of single-stage and two-stage isolators with this type of damping with the corresponding isolators containing only linear viscous damping. The results show that both isolators with linear viscous damping and nonlinear damping reduce the transmissibility around the resonance frequencies, but the results show that the isolators with nonlinear damping perform better at high frequencies.

show abstract

“…To the best of our knowledge, the design and study of variable negative stiffness are rarely reported. Only two ways have been found so far to realize variable negative stiffness: utilization of electromagnets [18][19][20] and application of actuator [21]. Zhou and Liu [18] and Francisco LedezmaRamirez et al [19,20] have presented a series of papers in which the negative stiffness is obtained by using two electromagnets and one (or two) permanent magnet.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the isolator with magnets is not suitable for vibration isolation at high temperature. Unlike the way of using the electromagnets, Xu and Sun [21] proposed a theoretical model with adjustable negative stiffness by applying actuators to the traditional negative stiffness mechanism shown in [5,6] to change the prestressed length of oblique springs. However, this regulating mode of the negative stiffness may be not very suitable for the practical application due to the empty trip phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…The magnitude of the negative stiffness is adjusted by the current; thus no auxiliary regulating mechanism is needed. It is not the intention here to address the advantage of the designed isolator compared with those impressing isolators proposed by [18][19][20][21] or how low frequency the designed isolator can work in. Rather the intention is to show a new way to achieve variable negative stiffness and validate it by simulation calculations and experimental tests.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Han

Liu

et al. 2018

Shock and Vibration

View full text Add to dashboard Cite

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.

show abstract

A multi-directional vibration isolator based on Quasi-Zero-Stiffness structure and time-delayed active control

Cited by 80 publications

References 30 publications

Design, Experiment, and Improvement of a Quasi-Zero-Stiffness Vibration Isolation System

Design, Experiment, and Improvement of a Quasi-Zero-Stiffness Vibration Isolation System

High-static-low-dynamic-stiffness vibration isolation enhanced by damping nonlinearity

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

Contact Info

Product

Resources

About