Practical design of the QZS isolator with one pair of oblique bars by considering pre-compression and low-dynamic stiffness

Various quasi-zero stiffness (QZS) vibration isolators have been developed by using the structures of oblique springs and bars. Towards a practical design, this paper further theoretically and experimentally studies the static and dynamic force of the QZS isolator with one pair of oblique bars by co...

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Bibliographic Details
Published in:Nonlinear dynamics 2022-06, Vol.108 (4), p.3313-3330
Main Authors: Zhao, Feng, Cao, Shuqian, Luo, Quantian, Li, Liqing, Ji, Jinchen
Format: Article
Language:English
Subjects:
Automotive Engineering
Bars
Classical Mechanics
Control
Design
Dynamical Systems
Engineering
Equilibrium
Frequencies
Laboratories
Mechanical Engineering
Original Paper
Springs (elastic)
Static equilibrium
Stiffness
Vibration
Vibration isolators
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Summary:Various quasi-zero stiffness (QZS) vibration isolators have been developed by using the structures of oblique springs and bars. Towards a practical design, this paper further theoretically and experimentally studies the static and dynamic force of the QZS isolator with one pair of oblique bars by considering pre-compression of horizontal springs and producing an extremely low-dynamic stiffness. By designing the new parameter configuration, two simple formulations are derived on the basis of two QZS conditions to design an improved QZS isolator with a constant low-dynamic stiffness in a wide region around the static equilibrium position. A detailed comparison between the proposed and the existing isolators is made to show the significant improvement on isolation performance. On the basis of the derived formulations, a prototype is fabricated and tested to verify the theoretical formulations and constant low-dynamic stiffness. The experimental results show that the designed QZS isolator can achieve a much wider QZS region to isolate vibration in a larger frequency band and demonstrate a lower displacement transmissibility for the external excitation.
ISSN:0924-090X
1573-269X
DOI:10.1007/s11071-022-07368-9