大型抽水蓄能电站厂房局部结构自振频率特性研究分析

Research and Analysis on Natural Frequency Characteristics of Local Powerhouse Structure of Large Pumped Storage Power Plant

为了避免或解决大型抽水蓄能电站厂房局部结构共振问题,需要精准研究分析局部结构的自振频率特性。本文以已投运的某大型抽蓄电站厂房为研究对象,采用弹簧阻尼边界模拟厂房结构周边约束进行仿真计算,并且采用冲击法进行现场实测验证,准确分析获得了该抽水蓄能电站厂房局部结构自振频率特性。通过分析,全面了解了该抽水蓄能电站厂房的原型结构动力特性,并进行了共振复核分析。分析结果对比表明,采用合理的仿真建模分析和正确的测试试验分析,可以准确得到抽水蓄能电站厂房局部结构自振频率特征。

In order to avoid or solve the problem of local structural resonance of Large Pumped Storage Power Plant,it is necessary to accurately analyze the natural frequency characteristics of local structures.In this paper,taking a powerhouse structure of large pumped storage power plant which had been put into operation as the research object,spring damping boundary is used to simulate the surrounding constraints of the plant structure for simulation calculation,and the impact method is used for field measurement verification.The two methods are mutually verified,and the local structure natural frequency characteristics of the pumped storage power plant are accurately analyzed and obtained.The dynamic characteristics of the prototype structure of the pumped storage power plant were comprehensively understood through this analysis,And the resonance recheck analysis was carried out.The comparison of the analysis results showed that the exact natural frequency characteristics of the local structure of the pumped storage plant’s powerhouse could be obtained by using the reasonable simulation modeling analysis and the correct test analysis.