Time-Frequency Domain Analysis of Vibration Signals for MachineryDiagnostics.(4): Interpretation Using Image Processing Techniques

摘要

A system which uses image processing techniques to assist in the automaticinterpretation of gear vibration signatures for early failure detection and fault diagnosis is described. The time signature of an individual gear in a gearbox is extracted by the time domain synchronous averaging technique from the total vibration signal measured in the gearbox casing. The time frequency distribution of the gear vibration signature, determined from the local power spectral density, is treated as an image, and the early failure detection and fault diagnosis are performed by interpreting the patterns in the image by the procedures of segmentation, connectivity analysis, and feature extraction. The implementation of the technique, the criteria for analysis of the image, and experimental examples are described.