水电站主厂房附属机电设备隔振有限元分析

Vibration Isolation of Electromechanical Equipment in Main Powerhouse of a Hydropower Station

结合某坝后式水电站厂房实际工程,采用有限单元法,在流道脉动压力作用下弹簧阻尼隔振体系对水电站厂房内调速器设备的隔振效果进行了分析研究。结果表明:在15 Hz脉动压力作用下厂房出现整体竖向振动,发电机层楼板振幅急剧增大,对布置在其上的机电设备有很强的冲击作用;当隔振体系自振频率为4.5 Hz^5.0 Hz时,隔振体系对低频脉动压力引起的振动有轻微的放大作用,对中高频脉动压力引起的振动有显著的隔振效果;隔振体系阻尼能有效减小共振区脉动压力引起的振动,对振动控制有利。

The effect of a damping-spring isolator on the vibration response of electromechanical equipment in main powerhouse of a hydropower station under fluctuating pressure was analyzed with the finite element method based on an actual powerhouse of a hydropower station at dam toe. The results showed that the amplitude of the equipment foundation increases rapidly under the action of fluctuating pressure of 15 Hz,which have a strong impact on electromechanical equipment arranged on it. When the natural vibration frequency of vibration isolation system is around 4. 5 Hz ～ 5. 0 Hz,the system has a little amplication on the vibration caused by pressure fluctuations of low frequency. At the same time,the system could isolate vibration efficiently caused by fluctuating pressure of medium and high frequency. The damping of vibration isolation system could absorb vibration caused by fluctuating pressure of resonance,which is beneficial to control vibration.