Vibration Isolation Performance Enhancement Using Hybrid Nonlinear Inerter and Negative Stiffness Based on Linkage Mechanism

Wei Dai, Baiyang Shi, Jian Yang

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

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 and negative 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.

Original languageEnglish
Pages (from-to)837-855
Number of pages19
JournalJournal of Vibration Engineering and Technologies
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2024

Keywords

  • Geometric nonlinearity
  • Inerter
  • Nonlinear spring
  • Vibration isolator
  • Vibration power flow

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Mechanical Engineering

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