Practical design of the QZS isolator with one pair of oblique bars by considering pre-compression and low-dynamic stiffness
- Publisher:
- SPRINGER
- Publication Type:
- Journal Article
- Citation:
- Nonlinear Dynamics, 2022, 108, (4), pp. 3313-3330
- Issue Date:
- 2022-06-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| Practical design of the QZS isolator with one pair of oblique.pdf | 2.39 MB |
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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.
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