Vibration isolation performance enhancement using hybrid nonlinear inerter and negative stiffness based on linkage mechanism

Dai, Wei; Shi, Baiyang; Yang, · Jian

Abstract

Purpose: To suppress the low-frequency vibration of dynamic systems such as underwater vehicles, this research proposes a novel geometrically nonlinear vibration isolator using hybrid nonlinear inertial andnegative stiffness element. Methods: A spring and an inerter are integrated together into a 4-rod linkage structure to form geometric nonlinearity. The performance of isolator under force or base-motion excitation is analysed. The performance of the proposed isolator in a flexible base structure simulating vibration isolation in ships is also considered. The transmissibilities and vibrational energy transfer are used to evaluate the effectiveness of isolation. Results: The results demonstrate better performance in low-frequency vibration isolation comparing to conventional linear isolator. The combined use of spring and inerter in the linkage mechanism can create a frequency band of ultra-low transmissibility and energy flow at low frequencies. Conclusion: Structural parameters of the proposed hybrid nonlinear element can be designed to alter the dynamic characteristic of the nonlinear isolator to attenuate low-frequency vibration transmission. The proposed nonlinear isolator demonstrates a strong potential for application in naval architecture.

• Journal Article Type: Article
• Acceptance Date: Jan 25, 2023
• Online Publication Date: Feb 14, 2023
• Publication Date: Jan 31, 2024
• Deposit Date: Feb 15, 2023
• Publicly Available Date: Feb 15, 2024
• Journal: Journal of Vibration Engineering and Technologies
• Print ISSN: 2523-3920
• Electronic ISSN: 2523-3939
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Pages: 837–855
• DOI: https://doi.org/10.1007/s42417-023-00879-8
• Keywords: Geometric nonlinearity; Vibration power flow; Vibration isolator; Inerter; Nonlinear spring
• Public URL: https://uwe-repository.worktribe.com/output/10461525
• Publisher URL: https://link.springer.com/article/10.1007/s42417-023-00879-8