Research-based Fault Diagnosis System Of Mechanical Transmission Of The The Hoc Virtual Instrument

The fault diagnosis of mechanical transmission is very important among mechanical equipments. The use of gear transmission is prevalent. This paper chose the gear transmission for studying the technology of extracting fault features in mechanical transmission systems, using higher order cumulants (HOC) which is a new technology of signal processing. And the virtual instrument (VI) of fault diagnosis based on HOC was developed.This paper discussed the characteristics of HOC in details and analyzed the technologies of signal processing based on HOC. The excellent ability of HOC in treating with non-linear characteristics of stochastic signals was also discussed. The signal processing technologies based on HOC and their estimates, which includeBispectra, Bicoherence and 1(1/2)-spectra, were studied. Then this paper introducedthose technologies into fault diagnosis of mechanical transmission systems and examined them in experiments. The results showed that HOC had good recognizing ability of fault features.Virtual instrument is a new technology in measurement field and the development of VI is cheaper, needs less developing time and has stronger expansibility. This paper introduced the design process and structure of the diagnosis VI for fault transmission system based on HOC technology. In the diagnosis system,BP-ANN was used for pattern recognizing and the 1(1/2)-spectra of vibration signalswas used for characteristic information. Then the paper examined the system in experiments. For the using of HOC technology, the fault recognizing ability of diagnosis system is enhanced.The paper is supported by graduate starting seed fund of Northwestern Polytechnical University (No. Z200524).