关键词: 齿轮振动;故障诊断;Kolmogorov-Smirnov检验;变载荷;信号处理

Abstract:

Varying load can cause changes in a measured gearbox vibration signals,however,conventional techniques for fault diagnosis are based on the assumption that changes in vibration signals are only caused by deterioration of the gearbox.Gear motion residual signals,which represent the departure of time synchronous averaging signals from the average tooth-meshing vibration,were analyzed as source data due to its lower sensitiveness to the alternating load conditions.The gear motion residual signals in gear healthy state were used as reference sample,and the residual signals in unknown gear states were used as objective sample.A two-sample Kolmogorov-Smirnov test was then performed.The statistical distance of the test was used as a fault parameter which was capable of diagnosing the gear crack effectively with a higher level of confidence.The other statistical measures such as kurtosis,variance were also analyzed and computed.The performance of the technique was demonstrated using a full lifetime gear shaft vibration data history.

Key words: gear vibration;fault diagnosis;Kolmogorov-Smirnov test;fluctuating load condition;signal processing