水电站双排式机组厂房现场测试分析

Analysis of field vibration test for the hydropower house of two-row placed units

水电站双排式机组厂房的主要特点是,机组前后对应双排布置,双排压力钢管单层与蜗壳相连,双排尾水管双层出流。文中采用数学统计和Fourier变换的方法,详细分析单机运行和联合运行时厂房的振动测试数据。分析结果表明,双层尾水管水压脉动主要受各自结构尺寸的影响,单机运行和联合运行时,其变化趋势基本相同。尾水管水压脉动是双排式机组厂房两机墩振动的主要联系。这些为双排式机组厂房的振动评估和动力反馈计算提供可靠的依据。

The main characteristics of a hydropower house of two-row placed units are as follows： two units are arranged in fore-and-aft places, two-row penstocks are connected to spiral case in one altitude, water runs through two-row draft tubes in double layer. By using the methods of mathematical statistic and Fourier manipulation, the test data of the power house are analyzed in detail. According to the results, the water pressure fluctuation of two draft tubes is subjected to the physical dimension, and the pressure fluctuation trend of one generator operating is similar to that of two generators operating. The pressure fluctuation in draft tube is the ligament of the vibration of two supporting composite structures. These may be helpful to appraising power house vibration and response computation.