Recent Advances in Quasi-Zero-Stiffness Vibration Isolation Systems

Niu, Fu; Meng, Ling Shuai; Wu, Wen Juan; Sun, Jing; Su, Wei; Meng, Guang; Rao, Zhu Shi

doi:10.4028/www.scientific.net/amm.397-400.295

Cited by 21 publications

(5 citation statements)

References 28 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The QZS isolator enables an isolation system to achieve low resonance in vibration while keep a high supporting capacity in static scenarios, which has demonstrated great advantages especially in solving low-frequency vibration isolation problems (Niu et al, 2013;Li et al, 2020;Yan et al, 2022). The QZS is a non-linear mount composed of a negative stiffness component and a positive stiffness component as shown in Figure 6A, where k v ; k h are the vertical and horizontal stiffness, respectively; l v ; l h are the length of the vertical and horizontal spring under the load f. The force-displacement (F − D) characteristic of a QZS is illustrated in Figure 6B, showing the high static (k v ) low dynamic (k d ) stiffness property.…”

Section: The Quasi-zero Stiffness Isolatormentioning

confidence: 99%

Analysis and design of non-linear seismic isolation systems for building structures—An overview

Zhu

Lang²,

Fujita³

et al. 2023

Front. Built Environ.

View full text Add to dashboard Cite

In this paper, the development of non-linear building isolation systems is overviewed. The study summarizes commonly used linear building isolation systems in two categories, which are building base isolation systems and building inter-storey isolation systems. Typical isolators including Lead-Rubber Bearings Friction Pendulum Bearings inter-storey viscous damper and Tuned Mass Damper are reviewed. The analysis and design of linear building isolation systems are also reported. After that, non-linear building isolation systems are introduced from two aspects based on their dynamic characteristics. They are (i) non-linear stiffness isolators including Quasi-Zero Stiffness isolators and Non-linear Energy Sink and (ii) non-linear damping isolators including power-law viscous dampers and magnetorheological dampers. Practical implementations of these non-linear isolators are introduced. Finally, the analysis and design of non-linear building isolation systems are discussed. Traditional equivalent linearization approaches and advanced non-linear frequency design approaches are introduced. The promising applications of the non-linear frequency design approaches to building isolation systems are also demonstrated in this review paper.

show abstract

Section: The Quasi-zero Stiffness Isolatormentioning

confidence: 99%

Analysis and design of non-linear seismic isolation systems for building structures—An overview

Zhu

Lang²,

Fujita³

et al. 2023

Front. Built Environ.

View full text Add to dashboard Cite

show abstract

“…Now, it has been widely studied for more than 60 years [5][6] . The key of QZS is to realize the negative stiffness [7] . According to the existing studies, the structure can be classified into two typical kinds, i.e., geometric nonlinearity and intrinsic nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Modeling, analysis, and simulation of X-shape quasi-zero-stiffness-roller vibration isolators

Mao

Yin

Ding

et al. 2022

Appl. Math. Mech.-Engl. Ed.

View full text Add to dashboard Cite

Existing quasi-zero stiffness (QZS) isolators are reviewed. In terms of their advantages, a novel X-shape QZS isolator combined with the cam-roller-spring mechanism (CRSM) is proposed. Different from the existing X-shape isolators, oblique springs are used to enhance the negative stiffness of the system. Meanwhile, the CRSM is used to eliminate the gravity of the loading mass, while the X-shape structure leaves its static position. The existing QZS isolators are demonstrated and classified according to their nonlinearity mechanisms and classical shapes. It is shown that the oblique spring can realize negative stiffness based on the simplest mechanism. The X-shape has a strong capacity of loading mass, while the CRSM can achieve a designed restoring force at any position. The proposed isolator combines all these advantages together. Based on the harmonic balance method (HBM) and the simulation, the displacement transmissibilities of the proposed isolator, the X-shape isolators just with oblique springs, and the X-shape isolators in the traditional form are studied. The results show that the proposed isolator has the lowest beginning isolation frequency and the smallest maximum displacement transmissibility. However, it still has some disadvantages similar to the existing QZS isolators. This means that its parameters should be designed carefully so as to avoid becoming a bistable system, in which there are two potential wells in the potential energy curve and thus the isolation performance will be worsened.

show abstract

“…As a result, linear vibration isolators are not competent for low-frequency vibration isolation. Therefore, quasi-zero-stiffness vibration isolators (QZS-VIs) have become a research hotspot because they have both high static and low dynamic stiffness [2]. The high static stiffness makes the QZS-VI have a high bearing capacity, while the low dynamic stiffness makes the QZS-VI possess a low natural frequency.…”

Section: Introductionmentioning

confidence: 99%

Beneficial performance of a quasi-zero-stiffness vibration isolator with displacement-velocity feedback control

Cheng

et al. 2022

Nonlinear Dyn

View full text Add to dashboard Cite

A displacement-velocity feedback control method is proposed to enhance the isolation performance of a quasi-zero-stiffness vibration isolator (QZS-VI). Time delay is considered in the controlled QZS-VI system. First, the steady-state solutions are obtained using the averaging method and further validated by a numerical method. The jump phenomenon and frequency island phenomenon could occur, and the stability analysis is implemented. Then, the effects of time delay and feedback gain on the frequency response and stability of solutions are analyzed in detail. And then, the force transmissibility is defined to evaluate the isolation performance of the controlled QZS-VI system. The results show that the time delay mainly affects the stability of the controlled system and has a weak influence on the isolation performance. The proposed displacement-velocity feedback control method can suppress the vibration in the resonant region effectively without affecting the performance in the isolation region. Finally, the vibration control effect is illustrated by the concept of an equivalent damping ratio.

show abstract

Recent Advances in Quasi-Zero-Stiffness Vibration Isolation Systems

Cited by 21 publications

References 28 publications

Analysis and design of non-linear seismic isolation systems for building structures—An overview

Analysis and design of non-linear seismic isolation systems for building structures—An overview

Modeling, analysis, and simulation of X-shape quasi-zero-stiffness-roller vibration isolators

Beneficial performance of a quasi-zero-stiffness vibration isolator with displacement-velocity feedback control

Contact Info

Product

Resources

About