云南电力技术
雲南電力技術
운남전력기술
YUNNAN ELECTRIC POWER
2014年
6期
1-4
,共4页
冯源%葛新峰%潘天航%郑源
馮源%葛新峰%潘天航%鄭源
풍원%갈신봉%반천항%정원
水轮机组%小波分析%故障分析%Lipschitz指数%特征提取
水輪機組%小波分析%故障分析%Lipschitz指數%特徵提取
수륜궤조%소파분석%고장분석%Lipschitz지수%특정제취
hydraulic turbine unit%wavelet analysis%vibration fault diagnosis%Lipschitz index%feature extraction
通过小波变换的手段对国内某水轮机组的振动异常进行故障分析，详细的阐明了小波奇异性检测的原理以及小波基函数选择的要求。采用Mallat算法，选用Db4小波在多分辨分析下对机组摆度信号进行处理成功提取出故障点的位置，并结合不同的频率分析出机械因素和水力因素造成故障的原因。最后运用连续小波变换的模极大值与尺度的对数关系进行图像拟合，计算出奇异点的 Lipschitz指数，以此作为故障信号的特征。通过比较两种不同因素影响的奇异点处的Lipschitz指数，证明其作为故障信号的特征参数对衡量机组故障程度有指导意义。
通過小波變換的手段對國內某水輪機組的振動異常進行故障分析，詳細的闡明瞭小波奇異性檢測的原理以及小波基函數選擇的要求。採用Mallat算法，選用Db4小波在多分辨分析下對機組襬度信號進行處理成功提取齣故障點的位置，併結閤不同的頻率分析齣機械因素和水力因素造成故障的原因。最後運用連續小波變換的模極大值與呎度的對數關繫進行圖像擬閤，計算齣奇異點的 Lipschitz指數，以此作為故障信號的特徵。通過比較兩種不同因素影響的奇異點處的Lipschitz指數，證明其作為故障信號的特徵參數對衡量機組故障程度有指導意義。
통과소파변환적수단대국내모수륜궤조적진동이상진행고장분석，상세적천명료소파기이성검측적원리이급소파기함수선택적요구。채용Mallat산법，선용Db4소파재다분변분석하대궤조파도신호진행처리성공제취출고장점적위치，병결합불동적빈솔분석출궤계인소화수력인소조성고장적원인。최후운용련속소파변환적모겁대치여척도적대수관계진행도상의합，계산출기이점적 Lipschitz지수，이차작위고장신호적특정。통과비교량충불동인소영향적기이점처적Lipschitz지수，증명기작위고장신호적특정삼수대형량궤조고장정도유지도의의。
By means of wavelet transform to analyze the abnormal vibration of domestic turbine units and combining theoretical deri-vation and Matlab simulation to illustrates the principle of wavelet singularity detection and the requirements of selecting wavelet ba-sis function.Under the multi-resolution analysis, using Db4 wavelet to decompose the shaft vibration signal with the algorithm of Mallat and in different frequency range,the analysis shows that the causes of abnormal vibration are mechanical and hydraulic fac -tors.Finally, make the image of modulus maxima of wavelet continuous transform and scale's logarithmic relationship to calculate the Lipschitz index of singular points, which is as the characteristic of the fault signal.Comparing the Lipschitz index of singular points caused by two different factors, it proves that as a fault signal's characteristic parameters, the Lipschitz index has a guiding signifi-cance to measure unit fault degree.
