Influence of Active Damping on a High-Static-Low Dynamic Stiffness (HSLDS) Isolation System

Abstract

This paper presents the influence of active damping on the dynamic response of a high- static-low-dynamic stiffness (HSLDS) isolation system. First, a model of a single-degree- of-freedom (SDOF) HSLDS isolation system is presented, and the approximate solution to the equation of motion is determined by the Harmonic Balance method (HBM), to the first order expansion. Then, the effect of active damping on the motion transmissibility performance is studied, accompanied by a comparison with passive damping to demonstrate the advantages of the actively damped HSLDS isolation system. In particular, the boundary of the stability region of the system is determined based on Floquet’s theory to demonstrate the effect of active damping on the system transmissibility performance. The results have shown that the increment of active damping produces more dynamically stable system.