Design and Low-frequency Vibration Isolation Characteristics of Seahorse Exoskeleton Hexagonal Structures

doi:10.3901/JME.260096

Abstract

Abstract: With the large-scale and lightweight trend of aerospace equipment, low-frequency vibrations induced by complex excitations have become a critical factor affecting accuracy, stability, and reliability. Inspired by the biomechanical principle of seahorse exoskeleton has the ability of protecting its vertebrae from injury under strong external impacts, a hexagonal vibration isolation structure mimicking the seahorse exoskeleton is proposed. The dynamic theoretical model is established, and the effects of structural parameters on the static stiffness and loading capacity of the seahorse exoskeleton inspired hexagonal structure are investigated. The dynamic equations are established based on the Lagrange formulation, the approximate transmissibility is obtained with the harmonic balance method. The effects of the structural parameters on the low-frequency vibration isolation performance are evaluated. An experimental system was built to validate the dynamic model of the seahorse exoskeleton hexagonal vibration isolation structure and its low-frequency vibration isolation performance. The results show that the seahorse exoskeleton hexagonal vibration isolation structure has a large quasi-zero stiffness working range, and the peak frequency of 1.9 Hz can be obtained by adjusting the structural parameters, and it has a better vibration isolation effect in the low-frequency band. This research offers theoretical and experimental guidance for the design and development of seahorse-inspired vibration isolation structures.

Key words: bio-inspired vibration isolation, quasi-zero stiffness, nonlinear vibration, low-frequency vibration isolation

CLC Number:

O328
TH113

WANG Shangwen, LING Peng, MA Hongye, WU Chuanyu, YAN Bo. Design and Low-frequency Vibration Isolation Characteristics of Seahorse Exoskeleton Hexagonal Structures[J]. Journal of Mechanical Engineering, 2026, 62(3): 435-445.

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