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.%In order to protect vibration-sensitive equipment from seismic excitation, a rolling platform is presented for vibration isolation and its concave surface profile is investigated. The nonlinear kinematic equation of the platform is established and its response to the El-Centro earthquake is analyzed. Numerical simulation of the platform is carried out to analyze its response to the EL-Centro seismic wave. Numerical results show that this isolation platform can eliminate the transmission of seismic acceleration to the equipment and the concave profile can limit the relative displacement of the equipment. Experiments are also conducted to verify the vibration isolation performance of the platform. The test results demonstrate that the horizontal resonance frequency of the rolling isolation platform is within 0.5 Hz-1 Hz. For random excitation in the frequency range of 0-16 Hz, the RMS value of acceleration is reduced by more than 90%. And for periodical excitation in the isolation area, the platform can also have better attenuation effect.
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