时频分析在油膜失稳与局部碰摩耦合故障中的应用  

APPLICATION OF TIME-FREQUENCY ANALYSIS TO COUPLING FAULTS WITH OIL-FILM INSTABILITY AND PARTIAL RUB-IMPACT

作　　者：马辉[1] 孟磊[2] 刘杰[1] 闻邦椿[1] 

机构地区：[1]东北大学机械工程与自动化学院,沈阳110004 [2]沈阳透平机械股份有限公司,沈阳110022

出　　处：《机械强度》2007年第5期699-703,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(50535010)~~

摘　　要：通过建立转子模型实验台,模拟油膜失稳和局部碰摩耦合故障,把实验采集到的发生故障的振动信号,利用三维谱振图对转子升降速过程进行粗略分析。在频率成分较复杂的地方,利用小波尺度图和再分配小波尺度图进行细化分析。结果表明,再分配小波尺度图具有高的时频分辨率,可以清楚地识别出频率成分接近的低频分量;油膜失稳引起的转定子碰摩故障,会产生一些低频成分,油膜振荡会产生半频成分;非线性油膜力是对系统起决定作用的重要因素,一般程度的碰摩对系统影响不大。A model test rig was set up to simulate coupling faults with oil-film instability and partial rub-impact. The collected vibration signals were roughly analyzed by 3-D waterfall spectra. In complicated frequency components domain, wavelet scalogram and reassigned wavelet scalogram were used to further analyze vibration signals. Results show that reassigned wavelet scalograin has higher time-frequency resolution than wavelet scalograIn and can well identify such close low-frequency components. The analysis results also in- dicate rub-impact faults induced by oil-film instability can produce some low-frequency components with small amplitude and oil whip can produce half frequency component; rob-impact with a common extent exerts a light influence on rotor systems and nonlinear oil-film force plays a decisive role in rotor systems.

关 键 词：时频分析 油膜失稳 碰摩 小波尺度图 耦合故障 

分 类 号：TH165.3[机械工程—机械制造及自动化] O347.6[理学—固体力学]