Research On Test And Fault Diagnosis System For Small Gearbox

This thesis is mainly concerned with problems of test and diagnosis system for small gearbox.Taking the gearbox of a type of lawn mower as objects, we studied the common principle and method of the test diagnosis system for small gearbox. This paper presents a test and fault diagnosis system for gearbox which can provide a simulated working condition for gearbox and perform various experiments according to industry standard or client's demands, so that the performance of gearbox can be described from different angles, fault can be located by analysis of its vibration signal and testing report form can be automatically formed.This paper introduces modern test and fault diagnosis methods and then discusses common principle and method for design of its hardware, software and interface with the background study on lawn mower. A fault diagnosis system based on gear vibration signal analysis is presented with theoretical basis of "Tri-frequency spectrum and Di-time domain" synthetical diagnosis, and the principleand structure of hardware and software are taken into consideration. Electromagnetism interference is analyzed and anti-jamming measure is provided in the light of both software and hardware.The principle and method showed fits not only small gearbox of lawnmower but also that of motorcycle, etc.