中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2012年
8期
951-956
,共6页
任达千%杨世锡%吴昭同%严拱标
任達韆%楊世錫%吳昭同%嚴拱標
임체천%양세석%오소동%엄공표
旋转机械%故障诊断%转子裂纹%局域均值分解%端点效应
鏇轉機械%故障診斷%轉子裂紋%跼域均值分解%耑點效應
선전궤계%고장진단%전자렬문%국역균치분해%단점효응
rotating machinery%fault diagnosis%cracked rotator%local mean decomposition(LMD)%end effect
为评估局域均值分解(LMD)受端点效应影响的程度,提出了一种基于能量的端点效应评价指标,并将LMD的端点效应与经验模态分解(EMD)的端点效应进行了比较。因包络线的定义方法不同,LMD在端点附近未定义的包络线较短,端点效应的程度也较轻。提出的端点效应镜像延拓抑制方法经仿真证明效果良好。将LMD应用于提取转子裂纹的故障特征,可获得满意的实验结果。
為評估跼域均值分解(LMD)受耑點效應影響的程度,提齣瞭一種基于能量的耑點效應評價指標,併將LMD的耑點效應與經驗模態分解(EMD)的耑點效應進行瞭比較。因包絡線的定義方法不同,LMD在耑點附近未定義的包絡線較短,耑點效應的程度也較輕。提齣的耑點效應鏡像延拓抑製方法經倣真證明效果良好。將LMD應用于提取轉子裂紋的故障特徵,可穫得滿意的實驗結果。
위평고국역균치분해(LMD)수단점효응영향적정도,제출료일충기우능량적단점효응평개지표,병장LMD적단점효응여경험모태분해(EMD)적단점효응진행료비교。인포락선적정의방법불동,LMD재단점부근미정의적포락선교단,단점효응적정도야교경。제출적단점효응경상연탁억제방법경방진증명효과량호。장LMD응용우제취전자렬문적고장특정,가획득만의적실험결과。
An index was developed based on energy for evaluating the end effect of LMD.The end effects of LMD and EMD(empirical mode decomposition) were compared.Because the envelop definition was different,in LMD the undefined envelop near border was shorter than that in EMD.LMD end effect is not as seriously as EMD.A mirror extension method was developed to reduce the end effect.The simulation results are quite good.LMD is applied in cracked rotor diagnosis,and the experimental results are also quite good.