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On the characteristics of an ultra-low frequency nonlinear isolator using sliding beam as negative stiffness

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Abstract

A novel structured ultra-low frequency nonlinear passive isolator is presented. The isolator is composed of a knife-edge supported sliding beam which offers negative stiffness and a vertical mechanical spring in parallel to get quasi-zero dynamic stiffness. The static characteristics of the isolator are studied. Assuming light viscous damping, the dynamic behavior is investigated and the response under harmonic excitation is derived using a simple approximation. Frequency response curves (FRCs), which exhibit complex double jump phenomenon, are obtained by harmonic balance method (HBM). The limitation of the excitation force level is obtained. The force transmissibility is derived and compared with an equivalent linear system with the same damping ratio. The isolation performance of the nonlinear isolator is shown to outperform the linear system for providing a wider isolation region. The influence of system parameters on the transmissibility is examined and some useful guidelines are given.

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Authors and Affiliations

  1. Institute of Vibration, Shock & Noise, Shanghai Jiao Tong University, Shanghai, 200240, China

    Xiuchang Huang, Xintian Liu & Hongxing Hua

  2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China

    Hongxing Hua

Authors
  1. Xiuchang Huang
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  2. Xintian Liu
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  3. Hongxing Hua
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Corresponding authors

Correspondence to Xiuchang Huang or Hongxing Hua.

Additional information

Recommended by Associate Editor Ohseop Song

X. Ch. Huang received his Ph.D. from the School of Mechanical Engineering at Shanghai Jiao Tong University. He is now a lecturer at the School of Mechanical Engineering. His research interests include vibration analysis and control.

X. T. Liu received his Ph.D. from the School of Mechanical Engineering at Shanghai Jiao Tong University. He is now an engineer at China Aerospace Science and Technology Corporation. His research interests include vibration analysis and control.

H. X. Hua received his Ph.D. from the University of Brussels in Belgium. He is a Professor and Doctoral Supervisor at the School of Mechanical Engineering. His research interests include vibration and shock analysis; vibration and shock control.

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Huang, X., Liu, X. & Hua, H. On the characteristics of an ultra-low frequency nonlinear isolator using sliding beam as negative stiffness. J Mech Sci Technol 28, 813–822 (2014). https://doi.org/10.1007/s12206-013-1205-5

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  • DOI: https://doi.org/10.1007/s12206-013-1205-5

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