谐波小波变换在转子—轴承系统多故障监测中的应用
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摘要
以谐波小波变换为工具,分析了转子—轴承系统出现裂纹与碰摩耦合故障时的振动特征,并分别讨论了油膜力、裂纹与碰摩的影响,为工程实际中转子系统的多非线性故障监测和诊断提供一种方案。结果表明,支承滑动轴承的非线性油膜力对转子系统的影响比较大,且裂纹与碰摩引起的耦合故障不是单裂纹和单碰摩故障的线性叠加。因此,转子系统多故障监测和诊断过程中,各个非线性因素应该得到充分考虑,并应从时域和频域同时进行分析,才能取得更为合理的结果。
Harmonic wavelet transform (HWT) is applied to the vibration analysis of a cracked rotor bearing system with rubs of its stators and rotors. Three nonlinear factors are taken into account. Using the time-frequency maps of HWT, the characteristics and energy distribution of rotor system can be described in detail. And the effect of the three nonlinear factors is investigated. Result shows that the nonlinear oil film force can weaken the faults characteristics, and the effect of the crack and rub-impact force must be considered simultaneously. In addition, the multi-nonlinear factors should be taken into account in both time domain and frequency domain to detect the faults of rotor bearing systems.
Harmonic wavelet transform (HWT) is applied to the vibration analysis of a cracked rotor bearing system with rubs of its stators and rotors. Three nonlinear factors are taken into account. Using the time-frequency maps of HWT, the characteristics and energy distribution of rotor system can be described in detail. And the effect of the three nonlinear factors is investigated. Result shows that the nonlinear oil film force can weaken the faults characteristics, and the effect of the crack and rub-impact force must be considered simultaneously. In addition, the multi-nonlinear factors should be taken into account in both time domain and frequency domain to detect the faults of rotor bearing systems.
引文
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[2]MallatS.A theory for multi-resolution signal decomposition: the wavelet representation[J].IEEE Trans.PatternAnal.MachineIntell.,1989,11(7):674-693.
[3]UnserM,AldroubiA.A review of wavelets in biomedicalapplications[J].Proc.IEEE,1996,84:626-638.
[4]范留明,黄润秋,吉随旺.地震信号的小波分析[J].物探化探计算技术,2000,22(1):1-4.FanLiuming,HuangRunqiu,JiSuiwang.Wavelet analysis of ground motion signals[J].ComputingTechniques forGeophysical andGeochemicalExploration,2000,22(1):1-4.(inChinese)
[5]杨建国,夏松波,须根法.基于小波的周期信号中瞬态冲击特征提取[J].航空动力学报,1999,14(4):343-347.YangJianguo,XiaSongbo,XuGenfa.Extracting the characteristics of transient impact from periodic signals based on wavelet[J].Journal ofAerospacePower,1999,14(4):343-347.(inChinese)
[6]刘献栋,李其汉.小波变换在转子系统动静件早期碰摩故障诊断中的应用[J].航空学报,1999,20(3):220-223.LiuXiandong,LiQihan.Application of wavelet transform to the diagnosis of early rub-impact faults between rotor and stator[J].Acta.AeronautAstronauticaSinica,1999,20(3):220-223.(inChinese)
[7]NewlandD E.Harmonic wavelet analysis[J].Proc.R.Soc.Lond.A,1993,443:203-225
[8]赵玉成.旋转机械故障诊断理论及方法的研究[D].西安:西安交通大学,2000.ZhaoYucheng.Research on diagnostic theory and method for rotating machinery[D].Xi抋n:Xi抋nJiaotongUniversity,2000.(inChinese)
[9]MengGuang.The nonlinear influences of whirl speed on the stability and response of a cracked rotor[J].Journal ofMachineVibration,1992,6(4):216-230
[10]AdamsM L,Abu-MahfouzI A.Exploratory research on chaos concepts as diagnostic tools for assessing rotating machinery vibration signatures[A].Proceedings ofIFTOMM FourthInternationalConference onRotorDynamics[C].Chicago,USA,September,1994.29-39.
[11]褚福磊,张正松,冯冠平.碰摩转子系统的混沌特性[J].清华大学学报(自然科学版),1996,36(7):52-57.ChuFulei,ZhangZhengsong,FengGuanping.Chaotic behavior of a rub rotor model[J].Journal ofTsinghuaUniversity(Sci.&Tech.),1996,36(7):52-57.(inChinese)
[12]钟一谔,何衍宗,王正,等.转子动力学[M].北京:清华大学出版社,1987.ZhongYi抏,HeYanzong,WangZheng, et al.Rotor dynamics[M].Beijing:TsinghuaUniversityPress,1987.(inChinese)
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