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针对汽轮机碰磨故障产生的轴系振动的微弱冲击信号,通过小波变换对测量信号进行滤波处理,在特定的尺度上提取碰磨产生的瞬时冲击成分,并对该冲击成分进行希尔伯特解调分析,用瞬时冲击信号的幅值包络反映信号在碰磨故障作用下产生的突变.对幅值包络信号进行小波奇异值检测,从而确定碰磨故障引起的信号突变点位置和持续作用时间.以某核电汽轮机组实际振动监测信号为例进行了分析,结果表明:采用小波奇异值检测方法对碰磨引起的突变信息进行检测,可以明显改善微弱碰磨故障特征的提取效果.
Aiming at the weak impact signal of shaft vibration caused by turbine rubbing failure, the measurement signal is filtered by wavelet transform, and the instantaneous impact component generated by impacting is extracted at a specific scale, and the Hilbert solution The amplitude envelope of the instantaneous impact signal reflects the sudden change of the signal under the impact of the touch-grinding fault.The detection of the amplitude envelope signal by the wavelet singular value is carried out to determine the location and persistence of the signal sudden change point caused by the touch- Time.The actual vibration monitoring signal of a nuclear power turbine unit is taken as an example to analyze the results. The results show that using the wavelet singular value detection method to detect the abrupt change information caused by abrasion can obviously improve the extraction effect of the fault characteristics of the weak touch.