Article
Engineering, Mechanical
Kan Ye, J. C. Ji
Summary: In this study, an origami-inspired vibration isolator with quasi-zero-stiffness (QZS) property is proposed using a truss-spring based stack Miura-ori (TS-SMO) structure. The unique structure uses coil spring sets to replace deformable creases, improving physical realization in engineering applications. Nonlinear force response and QZS feature are achieved through geometric nonlinearity and specific Poisson's ratio profile, with isolation performance discussed under variable viscous damping effects.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mathematics
Zhen Wang, Chuanlin He, Yan Xu, Dong Li, Zhanyuan Liang, Wei Ding, Lei Kou
Summary: This paper presents a novel 6-DOF QZS vibration isolation platform based on leaf spring structure, and draws conclusions through static and dynamic analysis. By improving the damping and length of the suspension spring, the dynamic vibration isolation effect of the system can be enhanced.
Article
Acoustics
Jia-Jia Lu, Ge Yan, Wen-Hao Qi, Han Yan, Jun-Wei Shi, Ao Chen, Wen-Ming Zhang
Summary: In this study, a load-adaptive electromagnetic QZS vibration isolator (LEQVI) is proposed, which can achieve a wide vibration isolation bandwidth and effective vibration attenuation by flexibly adjusting its rated load through regulating the excitation current.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Construction & Building Technology
Tao Liu, Aiqun Li, Hengyuan Zhang
Summary: Compared with the linear isolation system, the quasi-zero-stiffness (QZS) nonlinear isolation system has better low-frequency vibration isolation performance due to its high static stiffness and low dynamic stiffness. To optimize the isolation performance, a new isolation device based on the parallel connection of oblique springs and vertical springs was proposed, which can expand the interval of quasi-zero-stiffness through parameter optimization design. The vibration isolation performance of the QZS system was analyzed and compared with the linear system through a shaking table test.
STRUCTURAL CONTROL & HEALTH MONITORING
(2023)
Article
Engineering, Mechanical
Guilin Wen, Junfeng He, Jie Liu, Yu Lin
Summary: This study aims to expand the effective displacement range of quasi-zero stiffness systems through a semi-active control strategy. A novel vibration isolation system based on oblique springs and a coil spring is proposed, along with a feedback displacement strategy for stiffness adjustment. Theoretical analysis and virtual prototype simulation results show significant advantages in low-frequency vibration isolation performance for the proposed system.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Song Zuo, Dayang Wang, Yongshan Zhang, Quantian Luo
Summary: This paper investigates a parabolic cam-roller (PCR) quasi-zero stiffness (QZS) vibration isolator, which outperforms circular cam-roller (CCR) isolator in terms of vibration isolation performance. Experimental results show that the proposed PCR QZS isolator can withstand larger amplitudes of excitation and has lower stiffness and transmissibility around the equilibrium position compared to the CCR QZS isolator.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Ming Li, Wei Cheng, Ruili Xie
Summary: This paper introduces a passive quasi-zero-stiffness vibration isolator using a cam mechanism, which can generate ideal simplest restoring force directly and eliminate approximation errors. Experimental results confirm the proposed design principle and show the advantages of the QZS isolator in vibration tests, with wider isolation frequency bandwidth and weaker resonance effect compared to linear counterparts. The specific isolation efficiency and the effect of excitation amplitudes on vibration attenuation performance are comprehensively compared.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Acoustics
Yishen Tian, Xiaoyun Zhang, Chao Chen, Bo Fang, Dengqing Cao
Summary: This study investigates the nonlinear transverse vibration of a beam with one end free and the other end simply supported with a torsion spring. A torsional quasi-zero-stiffness vibration isolator is employed at the fixed end of the beam for vibration isolation. Differential equation of motion and natural characteristics of the beam are obtained using Hamilton's principle. The quasi-zero-stiffness vibration isolation system shows superior performance compared to the linear torsion spring, reducing the first resonant frequency and providing wide effective isolation range at low frequency.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Ge Yan, Zhi-Yuan Wu, Xin-Sheng Wei, Sen Wang, Hong-Xiang Zou, Lin-Chuan Zhao, Wen-Hao Qi, Wen-Ming Zhang
Summary: Various quasi-zero stiffness (QZS) vibration isolators have been successfully applied in low-frequency vibration isolation in recent years. However, the current approach is limited to compensating the negative stiffness of bistable structures using linear springs. This study proposes a nonlinear compensation method and verifies its effectiveness through a confirmatory system.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Junhan An, Guoping Chen, Xi Deng, Chen Xi, Tao Wang, Huan He
Summary: This paper examines the dynamic phenomenon of a pneumatic QZS isolator with mistuned mass and analyzes the amplitude-frequency relationship and force transmissibility. The results show that, in the case of a large mass mistuning, the system exhibits possible response periods and chaos phenomena. Mass detuning leads to a more complex nonlinear response of the QZS isolator, and the dynamic response becomes more sensitive to changes in parameters such as external excitation frequency, amplitude, and damping ratio. These findings are helpful for improving the structure of the pneumatic QZS vibration isolator and determining the applicable working frequency.
NONLINEAR DYNAMICS
(2022)
Article
Acoustics
Bo Yan, Ning Yu, Zhihao Wang, Chuanyu Wu, Sen Wang, Wenming Zhang
Summary: This study presents a lever-type quasi-zero stiffness vibration isolator (L-QZS-VI) to improve vibration isolation performance. The lever ratio, tip mass of the lever, and nonlinear stiffness of the magnetic spring are analyzed for their effects on the performance. Experimental results show that the vibration isolation performance can be greatly improved by adjusting these parameters.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
Yisheng Zheng, Xinong Zhang, Yajun Luo, Shilin Xie, Yahong Zhang
Summary: In this study, a six-degrees-of-freedom quasi-zero-stiffness isolation platform constructed using compressed-spring structures is proposed. Static and dynamic analysis show that the presence of static load results in linear cross-coupling effects, affecting the isolation performance of the platform in coupling directions.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Engineering, Mechanical
Chun Cheng, Yan Hu, Ran Ma, Weiping Wang
Summary: A displacement-velocity feedback control method is proposed to improve the isolation performance of a quasi-zero-stiffness vibration isolator (QZS-VI). The study considers the effect of time delay and analyzes its impact on system stability and frequency response. The results show that the proposed control method can effectively suppress vibration in the resonant region without affecting the performance in the isolation region.
NONLINEAR DYNAMICS
(2023)
Article
Mechanics
Yanqi Liu, Wen Ji, Erjie Deng, Xin Wang, Chunfang Song
Summary: This study presents a two degree-of-freedom quasi-zero stiffness (QZS) vibration isolator based on the anti-resonance characteristics of a multi-degree-of-freedom system. Nonlinear inclined springs (NIS) are used to achieve the nonlinear stiffness, with both linear and cubic stiffness terms. The effects of various mechanical and structural parameters on the stiffness characteristics are analyzed, and the dynamic response and force transmissibility are numerically discussed. The results show that the system can achieve smaller stiffness and wider low-stiffness range near equilibrium position by using smaller structural parameters and nonlinear inclined springs with softening stiffness.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Mechanical
Tengfei Chen, Yuxuan Zheng, Linhui Song, Xiumin Gao, Zhiming Li
Summary: This paper proposes a quasi-zero-stiffness (QZS) isolator with a new design of positive stiffness configuration, which exhibits beneficial nonlinearity and enhances the vibration isolation performance compared to previous designs.
NONLINEAR DYNAMICS
(2023)
