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With regards to the cyclostationarity of gear vibration, a novel indicator based on cyclic spectral analysis is proposed to assess localized gear damage. The cyclic spectral density of amplitude modulation and frequency modulation signals is deduced, and its properties in joint cyclic frequency-frequency domain are summarized. The ratio between the sum of cyclic spectral density magnitude along frequency...
Gear vibration signals are mainly due to the gear rotating, gear pair meshing and their coupling effects, and are usually modeled as amplitude modulation and frequency modulation (AMFM) processes. The modulation feature of vibration signals is related to the health status of gears. As well, their statistics change periodically with gear rotation, i.e. they are cyclostationary, so cyclostationary analysis...
The crack is a very serious defect in the rotor system. However, compared with any other defects, diagnosis of the rotor crack is more difficult, and its potential harm is similarly very serious. Therefore, it is very urgent and necessary to detect and diagnose the rotor crack effectively. In this paper, an approach of bispectrum analysis based on blind identification of time series model is proposed,...
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