Linear single-stage vibration isolation systems have a limitation on their performance, which can be overcome passively by using linear two-stage isolations systems. It has been demonstrated by several researchers that linear single-stage isolation systems can be improved upon by using nonlinear stiffness elements, especially for low-frequency vibrations. In this paper, an investigation is conducted into whether the same improvements can be made to a linear two-stage isolation system using the same methodology for both force and base excitation. The benefits of incorporating geometric stiffness nonlinearity in both upper and lower stages are studied. It is found that there are beneficial effects of using nonlinearity in the stiffness in both stages for both types of excitation. Further, it is found that this nonlinearity causes the transmissibility at the lower resonance frequency to bend to the right, but the transmissibility at the higher resonance frequency is not affected in the same way. Generally, it is found that a nonlinear two-stage system has superior isolation performance compared to that of a linear two-stage isolator.
On the Performance of a Two-Stage Vibration Isolation System Which has Geometrically Nonlinear Stiffness
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 18, 2014; final manuscript received August 18, 2014; published online September 11, 2014. Assoc. Editor: Guilhem Michon.
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Lu, Z., Yang, T., Brennan, M. J., Li, X., and Liu, Z. (September 11, 2014). "On the Performance of a Two-Stage Vibration Isolation System Which has Geometrically Nonlinear Stiffness." ASME. J. Vib. Acoust. December 2014; 136(6): 064501. https://doi.org/10.1115/1.4028379
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