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抽水蓄能电站厂房楼板振动测试分析研究

Research on the Floor Vibration Site Test of Pumped Storage Power Station

  • 摘要: 结合某抽水蓄能电站实际工程开展了多种工况下厂房楼板振动测试,研究了楼板结构的振动特性。结果表明:稳态运行工况下楼板的振动较小且频率组成稳定;而100%甩负荷和抽水事故停机等非稳态工况尽管仅持续几秒时间,但是产生的振动很大,其频率组成复杂且不稳定,优势频率随时间的变化与机组转速变化过程相关;在稳态运行工况下,靠近机组下机架基础的楼板振动更为明显,而在甩负荷工况靠近机组流道的水轮机层楼板振动更为明显。

     

    Abstract: Combined with a practical project,vibration field test of the floor slabs of a pumped storage power station under various working conditions is carried out to study the vibration characteristics of floor slabs. The results show that the vibrations of the floors are small and the frequency composition is stable under the steady-state operation conditions. However,the unsteady conditions such as 100% load rejection condition and pumping accident shutdown condition only last a few seconds,the structural vibration is very large,and the frequency composition is complex and unstable,while the time-dependent change of the dominant frequency corresponds with the change of unit rotating speed. Under steady-state operating conditions,the vibrations of the floor slab near the unit lower bearing bracket foundations are more obvious while the vibrations of floor slab near the unit flow passage are more obvious under load rejection conditions.

     

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