Determining method of numerical value of vibration noise of axle housing of drive axle

Abstract

The invention relates to a determining method of the numerical value of vibration noise of an axle housing of a drive axle. The method includes the following steps of firstly, establishing a dynamics analysis model of a drive axle system; secondly, calculating the vibration response of the drive axle system under the excitation of different gear transmission errors; thirdly, calculating a dynamic load of a boundary node of an axle housing bearing; fourthly, calculating the vibration response of a finite element model of a complete axle housing body unit; fifthly, calculating the noise radiation of an axle housing acoustic boundary element model. The dynamics modeling and calculating of the drive axle system are realized by means of a modal comprehensive model containing a nonlinear bearing unit, the obtained axle housing bearing boundary dynamic load is used for calculating the numerical value of the vibration noise of the complete axle housing finite element model, the defect that the nonlinear bearing rigidity coupling of a transmission system and the axle housing is not considered in an existing method, the axle housing boundary dynamic excitation load can not be accurately obtained, and meanwhile the defect that the calculating result of the vibration noise of the complete axle housing model can not be directly obtained through the modal comprehensive model is overcome.

Description

technical field [0001] The invention relates to a method for determining the vibration and noise value of a drive axle housing, in particular to a method for determining the vibration and noise value of a drive axle housing considering the influence of a gear transmission system, and belongs to the technical field of mechanical transmission. Background technique [0002] The research shows that the transmission error of the spiral bevel gear of the drive axle main reducer is the main cause of the vibration and noise of the drive axle. The dynamic excitation generated by the gear transmission error is transmitted to the axle housing through the drive shaft and bearings, causing the vibration of the axle housing and sending it to the outside world. Therefore, when determining the vibration and noise of the drive axle housing, the coupling effect between the gear transmission system and the axle housing should be accurately considered. [0003] Existing studies usually use the ...

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Problems solved by technology

[0003] Existing studies usually use the finite element method to numerically model and calculate the driving axle system. Although the structural characteristics of the driving axle system can be simulated more accurately, because the driving axle system contains multiple rolling bearings and there are a large number of contact relationships, the convergence is limited. However, due to the limitations of the nature and calculation scale, it is difficult to consider the contact relationship between the bearing roller and the raceway in the dynamic analysis model of the drive axle, so the existing research often ignores the nonlinear stiffness characteristics of the bearing when modeling and analyzing the drive axle system. , cannot accurately reflect the dynamic characteristics of the drive axle system

[0004] The invention patent with the patent number ZL201310502912.4 discloses a multi-support shafting finite element method considering the coupling nonlinearity of bearing stiffness. Modeling and analysis of multi-support shafting, but in order to realize the nonlinear numerical solution of the drive axle system model containing multiple bearings, it is usually necessary to perform modal comprehensive shrinkage transformation on the finite element model of the axle housing containing a large number of node degrees of freedom, Only the node degrees of freedom at the connection position between the axle housing and the transmission system bearings are reserved, and the node degrees of freedom inside the axle housing are all reflected in the form of modal degrees of freedom. Linear bearing stiffness coupling, but due to dimension reduction of the axle housing model, the vibration response results of the complete axle housing model cannot be obtained directly

At present, there is still a lack of a numerical determination method for the vibration and noise of the drive axle housing considering the influence of the transmission system

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