On the force transmissibility of a vibration isolator with quasi-zero-stiffness

Carrella, A., Brennan, M.J., Kovacic, I. and Waters, T.P. (2009) On the force transmissibility of a vibration isolator with quasi-zero-stiffness. Journal of Sound and Vibration, 322 (4-5), 707-717. (doi:10.1016/j.jsv.2008.11.034).

Record type: Article

Abstract

In this article the force transmissibility of a quasi-zero-stiffness (QZS) isolator is considered. The isolator comprises a vertical spring and two oblique springs that are either linear, linear with pre-stress or softening nonlinear with pre-stress. The force transmissibility of such a system is derived and compared with that of a linear system. Assuming light damping, simple approximate expressions for the maximum transmissibility and jump-down frequencies are derived. It is shown that there are advantages in having nonlinear and pre-stressed oblique springs compared to the other configurations, and that all the QZS systems can outperform the linear system provided that the system parameters are chosen appropriately.

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