SOCS analysis for vibration signal in transmission shaft of vehicle

In order to compute the exact position of default in vehicle´s transmission shaft, the cyclostationary of vibration signal in vehicle´s transmission shaft is analyzed, and the method about extracting imbalance vibration signal characteristic of transmission shaft by using SOCS(second order cyclostationary) is proposed, then through comparing the SOCS-peaks in different imbalance conditions, the imbalance direction of transmission shaft was found out. Experimental result shows that using the method of SOCS, the demodulation of signal can be effective, the special frequency in vibration signal of transmission shaft can be extracted, and the characteristic is obvious in base-frequency, and half of base-frequency of signal in vehicle´s transmission shaft.