离散小波与傅里叶分析相结合的水电机组振动测试研究  

Vibration Test of Hydropower Unit by Combined with Discrete Wavelet and Fourier Analysis

作　　者：潘天航 郑源[1] 葛新峰[1] 

机构地区：[1]河海大学能源与电气学院,江苏南京211100

出　　处：《水电能源科学》2015年第6期154-157,共4页Water Resources and Power

基　　金：江苏省博士后基金(1102072c);云南电网公司科技项目(K-YN2012-452)

摘　　要：为了更为准确有效地诊断水电机组的振动情况,对国内某电站进行稳定性试验,实测变负荷情况下机组的上下机架、各导轴承的振动和摆度信号以及尾水管的压力脉动,分析振动峰峰值与负荷的变化规律,并结合离散小波与频谱分析对水导轴承的摆度信号进行处理,提取出信号的奇异点和能量的优频（集中在0~50Hz的中低频段内）。分析得出是机组的动不平衡引起的主轴碰磨和水力脉动引起机组的异常振动,需进行动平衡处理,通过实际检修验证了该方法的有效性。For accurately diagnose the vibration status of hydropower unit, the stability test of a domestic power plant is implemented. The vibration of the upper and lower bracket, shaft vibration of water guide bearing and the draft tube pressure pulsation are measured under conditions of variable load. The change law between vibratory peak-to-peak value and load is analyzed. Combination of discrete wavelet and spectrum analysis is used to cope with the shaft vibration signal of water guide bearing. The singularity and energy optimal frequency concentrating within 0-50 Hz low frequency band of the signal are extracted. After analysis, it is drawn a conclusion that the grinding spindle touch by dynamic imbalance and the hydraulic pulsation cause the abnormal vibration of the unit, which need to deal with the dynamic balance. Actual in- spection confirmed the effectiveness of the proposed method.

关 键 词：水电机组 振动试验 小波分析 频谱 故障诊断 

分 类 号：TV734.21[水利工程—水利水电工程]