Cepstrum Analysis and Fault Diagnosis of Combine Harvester Transaxle

摘要

Head-feed combine harvester transaxle transmits motive force to the header and driving system, with adverse working conditions transaxle is especially prone to failure. It is not easy to detective and recognize faults of transaxle with traditional diagnostic methods as "Listening, Observation and Touch", because it has complex inner structures, especially number of meshing gears. In order to find fault components and distinguish failure types, analyzing the vibration signal of the transaxle. In the present paper, vibration signals of a certain type head-feed combine harvester transaxle are extracted by SENDIG S956Y vibration analyzer; fault shaft (frequency is 6.34Hz) and meshing gears (quefrency is 3.9ms) of the transaxle are located by cepstrum and the zoom amplitude spectrum and failure types of fault shaft and meshing gears are diagnosed out based on the exclusive characteristics of vibration signal of different faults in rotating machine. The results show that cepstrum and the zoom amplitude spectrum approaches that are proposed in the paper are successfully to ascertain the combine harvester transaxle fault.