Main contribution structure prediction method for vibration noise of an electric drive axle of a new energy automobile

Abstract

The invention relates to a main contribution structure prediction method for vibration noise of an electric drive axle of a new energy automobile, which comprises the following steps: S1, establishinga multi-body dynamics calculation model of the electric drive axle based on a multi-body dynamics method, and calculating an excitation force caused by a gear transmission error and bearing contact;S2, establishing a dynamic finite element model of the electric drive axle based on a finite element dynamic method, and calculating the frequency response of the drive axle under the action of the excitation force calculated in the step S1; And S3, establishing a boundary element model of the electric drive axle noise radiation based on a boundary element theory, and performing numerical calculation on the electric drive axle noise radiation based on the data obtained in the step S2. According to the method, the prediction time of the main noise contribution structure is saved, the experimentcost is reduced, and the accuracy of the important noise contribution structure under the predicted peak frequency is improved.

Description

technical field [0001] The invention relates to the field of advanced design and manufacture of automobiles, and more specifically, relates to a method for predicting the main contribution structure of vibration and noise of electric drive axles of new energy vehicles. Background technique [0002] Noise is a key factor in judging the comfort of modern vehicles, and the vibration and noise of the transmission system are often ignored in internal combustion engine vehicles. In electric vehicles, since there is no engine, the noise of the transmission system is highlighted, becoming the most important noise source affecting the comfort of electric vehicles. Therefore, reducing the vibration and noise of the transmission system can greatly reduce the vibration and noise of the whole vehicle, and the main vibration and noise in new energy vehicles is caused by the drive axle. [0003] At present, the main research idea on the vibration and noise of drive axles is numerical calc...

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Problems solved by technology

In addition, there is a certain gap between this method and the actual working process of the automobile drive axle. It is difficult to obtain accurate time-varying excitation of the gear mesh and cannot accurately describe the time-varying excitation that changes with the rotation of the bearing and is finally transmitted to the casing to cause the casing to vibrate. a process

Therefore, it is impossible to obtain an accurate numerical solution of the vibration and noise of the drive axle, and thus it is impossible to accurately predict the noise and the structural panel with a large contribution

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