河床式水电站副厂房GIS室隔振研究

结合某河床式水电站实际工程，采用有限单元法，对尾水管内水流脉动压力作用下阻尼弹簧隔振装置对副厂房GIS室的振动影响进行了研究。结果表明：GIS室楼板由隔振弹簧支承于梁柱上后，对副厂房整体结构的振动特性影响很小，GIS室楼板与其支承结构的振动特性差异明显；当隔振系统自振频率在3.5~4.5Hz时，隔振措施能兼顾隔离低频和高频脉动压力的振动影响，特别是能有效减小因高频脉动压力引起的高振动速度和加速度，对结构振动控制十分有利。

Research on Vibration Isolation of GIS Room in Auxiliary Powerhouse of In-stream Hydropower Station

The effect of damping-spring isolator on the vibration response of GIS room in auxiliary powerhouse of in-stream hydropower station under fluctuating pressure was analyzed by finite element method based on one practical hydropower station. The results show that vibration isolation system has small influence on the vibration characteristic of global auxiliary powerhouse, but the difference of vibration characteristic between floor and its supporting structure is obvious. When the natural frequency of vibration isolation system is between 3.5 and 4.5 Hz, the vibration of floor induced by both low and high frequency fluctuating pressure can be isolated. It’s notable that the vibration responses, especially large vibration velocity and acceleration caused by fluctuating pressure with high frequency, can be reduced to a great extent. Therefore, the vibration isolation system is beneficial to the control of structural vibration.