The Model Of Gear Fault Diagnosis Based On Virtual Prototype Technology And Explicit Dynamics

The construction of gear fault diagnosis model has become a common keyissues need to solve in all kinds of high-end equipment.To diagnose the gearcrack fault, we must be able to accurately measure the gear dynamic loadcurve.andto comprehensive use of the dynamic load curve, to analysis thefaultof gear by explicit dynamic.We can clear the gear crack of gear movementparameters which affect the obviously,andwith the parameters of the monitoringobject by experiment to verify the feasibility of the gear crack fault diagnosismodel.A pair cylindrical gear as research object in this paper,using virtualprototype technology to collect the gear dynamic load curve, then build thefinite element model based on implicit dynamics. on this basis of the elementmodel,dynamic load curve is input to analyze the normal gears and fault gearthrough finite element, then comparison of gear parameters such as velocity,acceleration, stress and strain curve characteristics.Choose obvious differencebetween the characteristic parameters of gear to realize on-line monitoring.This paper first briefly explainedthe developing situation of gear faultdiagnosis, and expoundthe necessity to select the theory of virtual prototypetechnology and explicit dynamics to study the gear fault. Then indicate theimportance of the gear crack fault detection.With the virtual prototypetechnology to build mechanical model in SolidWorks, construct upper computerwith LabVIEW and establish electrical control system with Ni softmotionfunction. master computer control the rotating speed of gear,then collect the geardynamic load curve; On a test machine to proceed the same operation, through the sensors of test machine to collect dynamic load curve in the real physicalenvironment. the comparison proves that the dynamic load curve whichcollected by virtual prototype hasreference and application. Established thefinite element model of gear according to explicit dynamics theory.inputdynamic load curves which were collected by the virtual prototype, obtainedstress contours, strain contours and acceleration curve and so on with finite-element analysis.The comprehensive analysis and comparison shows thatwhether the gear fault can be characterized by the acceleration curve. Analyzethe data which collect byvirtual prototype, the finite element analysis model andthe testing machine.to confirm acceleration as characteristic parameters tomonitorthe gear online. When gear acceleration anomalies we can think it ispossible for gear has produced cracks.Use the existing machineto collect experimentdata in the end.thencomparing experimental data and simulation data to show the accuracy of thefinite element analysis and prove the feasibility of the gear fault diagnosis modelon this subject and the practicability of the method to gear fault detection.Based on virtual prototype technology and explicit dynamics theory tobuild the gear crack fault diagnosis model can be applied to the gear box,transmission and gear reducer which would give priori ty to gear transmissiononline monitoring of the key parts of gear.Then predict gear crack occurred,timely change gear, and avoid unexpected accident with gear fault, reduceindustrial accident.