GEAR CRACK EARLY DIAGNOSIS USING BISPECTRUM DIAGONAL SLICE  

作　　者：Li WeihuaZhang GuicaiShi TielinYang ShuziSchool of Mechanical Scienceand Engineering,Huazhong University of Scienceand Technology,Wuhan 430074, China 

出　　处：《Chinese Journal of Mechanical Engineering》2003年第2期193-196,共4页中国机械工程学报（英文版）

基　　金：This project is supported by 95 Pan Deng Program of China (No.PD952l908); National Key Basic Research Special Foundation of China (No.Gl998020320);Provincial Natural Science Foundation of Hubei, China (No.2000J125)

摘　　要：A study of bispectral analysis in gearbox condition monitoring is presented.The theory of bispectrum and quadratic phase coupling (QPC) is first introduced, and then equationsfor computing bispectrum slices are obtained. To meet the needs of online monitoring, a simplifiedmethod of computing bispectrum diagonal slice is adopted. Industrial gearbox vibration signalsmeasured from normal and tooth cracked conditions are analyzed using the above method. Experimentsresults indicate that bispectrum can effectively suppress the additive Gaussian noise andchracterize the QPC phenomenon. It is also shown that the 1-D bispectrum diagonal slice can capturethe non-Gaussian and nonlinear feature of gearbox vibration when crack occurred, hence, this methodcan be employed to gearbox real time monitoring and early diagnosis.A study of bispectral analysis in gearbox condition monitoring is presented.The theory of bispectrum and quadratic phase coupling (QPC) is first introduced, and then equationsfor computing bispectrum slices are obtained. To meet the needs of online monitoring, a simplifiedmethod of computing bispectrum diagonal slice is adopted. Industrial gearbox vibration signalsmeasured from normal and tooth cracked conditions are analyzed using the above method. Experimentsresults indicate that bispectrum can effectively suppress the additive Gaussian noise andchracterize the QPC phenomenon. It is also shown that the 1-D bispectrum diagonal slice can capturethe non-Gaussian and nonlinear feature of gearbox vibration when crack occurred, hence, this methodcan be employed to gearbox real time monitoring and early diagnosis.

关 键 词：condition monitoring gear crack early diagnosis quadratic phase coupling bispectrum diagonal slice 

分 类 号：TH132.4[机械工程—机械制造及自动化]