Research on Seismic Horizontal Deformation Control of Low-Frequency Vibration Isolation Platform

Low-frequency vibration isolation platform is widely used in the vibration control of ultra-precision engineering. It is of great significance to study the horizontal deformation control excited by earthquake action. In this paper, the seismic horizontal deformation with different damping ratios is investigated firstly. The results show that the large increase of damping ratio cannot significantly reduce the seismic horizontal deformation. For this reason, bidirectional horizontal viscous dampers attached to the vibration isolation platform are adopted here. The results show that the bidirectional viscous dampers can significantly reduce the horizontal deformation excited by the