| The driving axle housing is helpful to fix the left and right driving wheel,and also to protect the main reducer and differential,and to bear the weight of the vehicle,it is one of the most important part of the vehicle.In the process of driving,the driving axle housing suffers from complex forces,its reliability directly affects the reliability of the whole vehicle.The related studies show that the main failure form of the driving axle housing is fatigue failure,so it is necessary to study the fatigue strength and fa tigue life of the driving axle housing.The reliability test is an important means to ensure the reliability of the vehicle parts,it can be divided into road test and field test and indoor bench test.Road test and field test are of highest precision,however,the road test is of poor repeatability,long cycle and high cost.Field test is expensive and easily influenced by the weather,driving habits and other objective factors.Indoor bench test is favored by enterprise with safety,good repeatability and price.At present,the method of driving axle housing test is mainly using single axis pulsating and sine force,which is not consistent with the multi-axle dynamic stress in the actual road condition,and it may lead to over test or under test.Therefore,it is very critical to carry out multi axle road simulation test for automobile drive axle housing.Aiming at the shortcomings of the existing driving axle housing,a multi axle road simulation test system is built combined with the finite element analysis method and virtual prototype technology and remote parameter control method.It is of great scientific significance and engineering application value for the reliability assessment,structural optimization and lightweight design of automotive drive axle housing.To begin with this paper,according to the,stress condition of the driving axle housing under several limit conditions is analyzed in theory based on the driving axle housing offered by a certain enterprise.Combined with the vary stress condition of the driving axle housing,we select the constraint and load in different ways.The driving axle housing stress analysis and strength evaluation under typical working conditions is done by finite element software.The stress characteristics and weaknesses of dr iving axle housing is obtained based on the analysis,so as to provide the basis for the selection of remote parameter control point.Secondly,a set of drive axle multi axis road test device is designed based on driving axle housing's real load and constraints,combined with the driving axle housing made by an enterprise and MTS hydraulic control system components and existing hardware.According the results of finite element analysis,the components of the test bench is of enough reliability and stability.On this basis,multi rigid body model bench is built by importing the three-dimensional model multi-body dynamics software ADAMS and adding material properties and constraints.The rigid flexible coupling model is established with result of modal analysis of driving axle housing.The loading mode of actuator based on force control is effective based on the virtual simulation analysis of the coupling dynamics model.According to the location and size of the stress,the iteration point under dynamic loading position was basically confirmed.Finally,based on the design scheme of the driving axle housing bench test device in chapter three,a multi axis road simulation test system is built.The system installation,commissioning and the selection of the final remote control points are analyzed in detail.Finally,we extract the desire response signal of three points to conduct the iterative simulation test based on force remote parameter control.The iteration tests was terminated by adjust the gain value when the error of response signals of the three iteration point is less than 10% after 15 times iterations,the critical stress of the driving axle in the actual road are accurately repeated,then we extract the excitation spectrum which called multi axial excitation spectrum of road simulation.Therefore,an effective control method was provided for driving axle housing multi axis road simulation test. |
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