Non-stationary Vibration Signal Analysis for a Diesel Engine Based on Cyclic Spectrum Theory

摘要

Aimed at the problem of the feature of non-stationary vibration signal of diesel engine can not be extracted easily, the cyclic spectrum theory was introduced in this paper. At first, the theory of second-order cyclic spectrum (SOCS) and the non-stationary data acquiring principle was brought in; then, the non-stationary vibration signals of diesel engine were analyzed by the method of SOCS. The result showed that the method of SOCS can effectively extract the fault feature frequencies hiding in the accelerating vibration signals.