低频隔振基台地震水平变形控制研究
Research on Seismic Horizontal Deformation Control of Low-Frequency Vibration Isolation Platform

低频隔振基台在超精密工程振动控制中应用广泛，研究其地震作用下的水平变形控制具有重要意义。本文先开展了不同阻尼比条件下的地震水平变形研究，结果显示阻尼比的大幅增加并不能显著降低地震水平变形；为此，考虑在隔振基台附加双向水平粘滞阻尼器，结果显示双向粘滞阻尼器可以显著降低地震水平变形，阻尼器出力曲线饱满，能够较好地发挥控制作用。本研究对于低频隔振基台的地震水平变位控制具有一定的指导作用。
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 seismic vibration, and the output curve of the damper is plump, and it indicates that the dampers can play a better control role. This study has a certain guiding role for the seismic horizontal displacement control of low-frequency vibration isolation base platform.