Orthogonal six-DOFs vibration isolation with tunable high-static-low-dynamic stiffness: Experiment and analysis

Abstract

In order to suppress the low-frequency vibration of a high-precision instrument, an orthogonal six-DOFs vibration isolation system with tunable high-static-low-dynamic stiffness characteristics is studied using experimental and analytical methods. The current-controlled magnetic spring is used to obtain the tunable orthogonal six-DOFs HSLDS, which adapts to different suspended masses. A dynamical model of electromagnetic nonlinear vibration isolation system with orthogonal six-DOFs is developed to investigate the experimental results. Moreover, the harmonic balance analysis together with arc-length continuation are used to analyze the frequency response function of force transmissibility. Both experimental and analytical results are shown that as a controlled current increases, the isolation frequency range is widened. Parametric studies of this study demonstrate that increasing the electromagnetic coefficient and decreasing the onset distance can decrease the isolation start frequency. It is obtained that proper parameter is necessary to achieve broadband frequency range, and this article also provides a relevant explanation of these results.