Applied Mathematics and Mechanics (English Edition) ›› 2024, Vol. 45 ›› Issue (8): 1371-1386.doi: https://doi.org/10.1007/s10483-024-3135-6

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Theoretical and experimental investigations on an X-shaped vibration isolator with active controlled variable stiffness

Zeyu CHAI1, J. T. HAN2, Xuyuan SONG1,3,*(), Jian ZANG1, Yewei ZHANG1, Zhen ZHANG1   

  1. 1 College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China
    2 Jacobs School of Engineering, University of California San Diego, San Diego CA 92122, U. S. A.
    3 Key Laboratory of Vibration and Control of Aero-Propulsion System, Ministry of Education, Northeastern University, Shenyang 110819, China
  • Received:2024-03-04 Online:2024-08-03 Published:2024-07-31
  • Contact: Xuyuan SONG E-mail:songxuyuan@163.com
  • Supported by:
    the National Natural Science Foundation of China(12022213);the National Natural Science Foundation of China(12002329);the National Natural Science Foundation of China(U23A2066);the National Natural Science Foundation of China(12272240);the National Natural Science Foundation of China(12002217);Project supported by the National Natural Science Foundation of China (Nos. 12022213, 12002329, U23A2066, 12272240, and 12002217)

Abstract:

A novel X-shaped variable stiffness vibration isolator (X-VSVI) is proposed. The Runge-Kutta method, harmonic balance method, and wavelet transform spectra are introduced to evaluate the performance of the X-VSVI under various excitations. The layer number, the installation angle of the X-shaped structure, the stiffness, and the active control parameters are systematically analyzed. In addition, a prototype of the X-VSVI is manufactured, and vibration tests are carried out. The results show that the proposed X-VSVI has a superior adaptability to that of a traditional X-shaped mechanism, and shows excellent vibration isolation performance in response to different amplitudes and forms of excitations. Moreover, the vibration isolation efficiency of the device can be improved by appropriate adjustment of parameters.

Key words: bionic vibration isolation, X-shaped structure, variable stiffness structure, nonlinear dynamics, prototype experiment

2010 MSC Number: 

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