Theoretical Design and Dynamic Analysis of a Quasi-Zero Stiffness Device Using Precompressed Springs as Negative Stiffness Component
Publication: Journal of Engineering Mechanics
Volume 150, Issue 2
Abstract
Based on the principle of parallel connection of positive and negative stiffness structures, a new quasizero stiffness (QZS) isolation device is proposed in which the negative stiffness structure is designed by a nonlinear precompressed spring system. The mechanical model of the device is dimensionless, and the parameter conditions required to achieve QZS at the static equilibrium position are derived. The agreement between the theoretical mechanical model and the experimental mechanical model of the device is further verified by static experiments. The dynamic model of the QZS system is investigated by using the approximate analytical and numerical methods of nonlinear vibration, which reveals the influence of the device parameters on its nonlinear dynamic characteristics and vibration isolation performance. Shaking table test were conducted to compare and analyze the dynamic response characteristics and isolation performance of the QZS system with the equivalent linear system. The results showed that the new device can effectively extend the isolation frequency range, reduce the isolation amplitude, and have good isolation performance.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was substantially supported by the National Key Research and Development Program of China (2017YFCO703600).
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Published In
Journal of Engineering Mechanics
Volume 150 • Issue 2 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 21, 2022
Accepted: Jul 18, 2023
Published online: Nov 22, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 22, 2024
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