河床式水电站副厂房GIS室隔振研究

摘要

The effect of a damping-spring isolator on the vibration response of GIS room in auxiliary powerhouse of an in-stream hydropower station under fluctuating pressures was analyzed with the finite element method based on one actual hydropower station.The results showed that the GIS room vibration isolation system has a small influence on the vibration characteristics of the global auxiliary powerhouse;but the differences between vibration characteristics of its floor and those of its supporting structure are obvious;when the natural frequency of the vibration isolation system is between 3 . 5 to 4.5 Hz,the vibration of the floor induced by both low and high frequency fluctuating pressures can be isolated;especially,the large vibration velocity and acceleration caused by fluctuating pressures with high frequencies can be reduced effectively,therefore,the vibration isolation system is beneficial to structural vibration control.%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"4．5 Hz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。