Large stroke quasi-zero stiffness vibration isolator using three-link mechanism

Quasi-zero stiffness (QZS) is beneficial for low-frequency vibration isolation. However, most isolators based on QZS have a small working stroke and a limited load capacity, which hinders applications in many environments. Here, a large stroke QZS vibration isolator using three-link mechanisms (TLMs...

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Veröffentlicht in:Journal of sound and vibration Jg. 478; S. 115344
Hauptverfasser: Yan, Ge, Zou, Hong-Xiang, Wang, Sen, Zhao, Lin-Chuan, Gao, Qiu-Hua, Tan, Ting, Zhang, Wen-Ming
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Amsterdam Elsevier Ltd 21.07.2020
Elsevier Science Ltd
Schlagworte:
Adjustable load capacity
Amplitudes
Dynamic models
Euler-Lagrange equation
Frequencies
Large stoke
Load
Low frequencies
Numerical analysis
Passive vibration isolator
Polygons
Quasi-zero stiffness
Resonant frequencies
Springs (elastic)
Stiffness
Vibration analysis
Vibration control
Vibration isolators
Adjustable load capacity
Quasi-zero stiffness
Passive vibration isolator
Large stoke
ISSN:0022-460X, 1095-8568
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Zusammenfassung:Quasi-zero stiffness (QZS) is beneficial for low-frequency vibration isolation. However, most isolators based on QZS have a small working stroke and a limited load capacity, which hinders applications in many environments. Here, a large stroke QZS vibration isolator using three-link mechanisms (TLMs) is proposed. We design a symmetric polygon structure consisting of two three-link structures which exhibits a linear negative stiffness with large displacement. Then, the quasi-zero stiffness with large stroke could be realized by parallel connection of the symmetric polygon structure and linear springs. In addition, the load capacity of the proposed QZS system is extended by 1.5–2 times compared with a single polygon structure and can be flexibly adjusted. The design philosophy and operation principle of QZS isolator using TLMs are described in detail. The dynamic model is established based on the Lagrange equation. Numerical and experimental results demonstrate that the large stroke QZS vibration isolator has a lower resonant frequency and outperforms the linear counterpart especially at low frequencies. Moreover, the proposed isolator is less sensitive to vibration amplitude than the traditional QZS isolator. This novel design may provide a feasible method for large amplitude low frequency vibration control and isolation.
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ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2020.115344