Molecular spring isolation system with cubic nonlinear damping

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (11) : 171-175.

YU Mu-chun CHEN Qian

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Abstract

The present study is concerned with the theoretical analysis and simulation of the effects of nonlinear viscous damping on vibration isolation of molecular spring isolation systems. Molecular spring isolator is a novel vibration isolator which has high-static-low-dynamic stiffness property. To build the nonlinear vibration isolation system, an MR damper is put in parallel with molecular spring isolator and PI feed-back control is used to realize the desired cubic damping property. Simulation is conducted to study the influence of cubic damping on vibration isolation. After that, the vibration isolation mechanism of cubic damping is analyzed by harmonic balance method. The research reveals that, for force transmissibility, only resonant region is modified by cubic damping and the non-resonant region remains unaffected. However, no similar properties of cubic damping can be found for displacement isolation.

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Vibration isolation / Cubic damping / Molecular spring isolator / MR damper

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YU Mu-chun CHEN Qian. Molecular spring isolation system with cubic nonlinear damping[J]. Journal of Vibration and Shock, 2017, 36(11): 171-175

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