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针对振动敏感型设备地震响应隔离问题,研究一种滚动隔震平台,并给出凹形复位板曲面轮廓。建立隔震平台的运动微分方程,通过数值仿真对El-Centro地震波响应进行分析,结果表明隔震平台可消减地震加速度向其承载设备的传递,并且曲面轮廓限制了设备的相对位移。在仿真分析的基础上,对滚动隔震平台的隔震性能进行实验验证,结果显示滚动隔震平台水平方向共振频率在0.5 Hz~1 Hz之间,对于0~16 Hz内的随机激励,隔震后的加速度RMS值下降90%以上;在隔震区,对单频激励也有较好的衰减效果。
Aiming at the problem of seismic response isolation of vibration-sensitive equipment, a kind of rolling isolation platform is studied and the concave profile plate surface profile is given. The differential equations of motion of the isolation platform are established. The response of the El-Centro seismic wave is analyzed by numerical simulation. The results show that the isolation platform can reduce the transmission of seismic acceleration to its load-bearing device and the curved profile limits the relative displacement of the device. Based on the simulation analysis, the isolation performance of the rolling isolation platform is verified by experiments. The results show that the horizontal resonance frequency of the rolling isolation platform is between 0.5 Hz and 1 Hz. For random excitation within 0-16 Hz, After the earthquake, the RMS value of acceleration decreased by more than 90%. In the isolated area, the single-frequency excitation also had better attenuation effect.