Date: 07 Nov 2012

An Analysis of Vehicle Engine Vibration Signals with Digital Order Tracking Approaches

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This chapter presents an application of Digital Order Tracking to vibration signal analysis of automobile engines. By using a tacho probe to detect the variation of engine speeds and an accelerometer to collect the vibration signals of the engine,the FFT-based analysis are performed in order spectra. Data processing is implemented by digital manipulation—adding zeros, interpolations, oversampling and resampling. Zoom factor D and decimation d are thoughtfully selected. A comparisons between tracking and non-tracking spectra is made and the order spectra are plotted in different forms. Referring to the analyzed results, a successful engine diagnoses have been presented.