新疆阜康抽水蓄能电站地下主厂房结构振动特性分析

Analysis on Vibration Characteristics of Underground Powerhouse Structure at Xinjiang Fukang Pumped Storage Power Station

为了实现双碳目标,国家大力发展抽水蓄能电站。大型抽水蓄能电站由于具有转速高、水头高、双向运行及工况转换频繁等特点,其地下主厂房极易发生振动。为了复核新疆阜康抽水蓄能电站地下主厂房结构的抗振设计是否合理,通过建立地下主厂房结构的三维有限元模型,进行厂房固有振动频率计算和共振复核,采用瞬态分析方法,根据模型试验结果计算了水轮机脉动压力作用下厂房的振动反应。结果表明:局部立柱结构的自振频率与水轮机叶片数频率的错开度较小,有可能产生共振;但在脉动压力作用下,楼板和立柱结构的振动反应均在允许范围内,分析结果表明地下厂房结构设计是合理的。

In order to achieve the carbon peaking and carbon neutrality goals,China has been vigorously developed pumped storage power stations.Due to the characteristics of high rotating speed,high head,bidirectional operation and frequent transformation of working conditions,the underground powerhouse structure of large-scale pumped storage power station is prone to vibration.In order to check the rationality of anti-vibration design of underground powerhouse structure of Xinjiang Fukang pumped storage power station,a three-dimensional finite element model of the underground powerhouse structure is established to study the natural vibration frequency and the possibility of resonance.The transient analysis method is used to calculate the vibration response of the powerhouse structure under the action of fluctuating pressure of the water turbine obtained by the model test results.The results show that there is a small deviation between the natural vibration frequency of the local columns and blade number frequency,which may produce resonance.However,under the action of fluctuating pressure,the vibration response of the floors and columns is in allowable range,which indicates that the design of the underground powerhouse structure is reasonable.