Transmission bearing fault diagnosis based on adaptive immune detector

LI Hongfang1, ZHANG Qinghua2

(1.Department of Electronic Engineering, Shanxi Vocational College of Economic and Trade, Taiyuan 030024,

China; 2.Guangdong Provincial Key Lab of Fault Diagnosis of Petrochemical Equipment, Maoming 525000, China)

Abstract: Aiming at the nonstationary characteristics of transmission bearing fault vibration signals and the difficulty to extract the feature, the dimensionless parameters are not sensitive to be changed in the amplitude and frequency of vibration signal of as the characteristic parameter,and the characteristic parameters were divided into selfmodel and nonselfmodel. An adaptive immune detector was designed to overcome the limitations of conventional diagnosis method based on the artificial immune principle. The adaptive mutation and suppression threshold were redefined. In the transmission bearing test rig, firstly, vibration acceleration information of bearing under the six states were measured. Secondly, five dimensionless characteristic parameters were obtained by calculating the dimensionless index of vibration information. And then, the detectors generation by utilizing those feature parameters were matured to train the proposed detector. Finally, the five bearing faults were diagnosed by mature detectors. The experimental results indicate that, the adaptive immune detector presented to diagnose transmission bearing faults is feasible and effective.

Key words: fault diagnosis; dimensionless parameter; adaptive immune detector; transmission bearing