Noise simulating calculation method for automotive alternating current generator

Abstract

The invention relates to a noise simulating calculation method for an automotive alternating current generator. The method comprises the following steps of initializing basic data, performing setting and grid division on a simulating calculation area, calculating an unsteady aerodynamic characteristic equation set of the generator at specific rotating speed by adopting finite volume method-based commercial CFD (computational fluid dynamics) software, verifying correctness, verifying the correctness of a simulating numerical value calculation result, testing and measuring the aerodynamic performance and the noise of the alternating current generator, and performing noise reduction structure optimization design on the alternating current generator according to a comparison result of the simulating numerical value calculation result and a practical verification result. According to the method, the far-field radiation aerodynamic noise characteristics of a main aerodynamic noise source part, different turbulence model for predicting the nose of the alternating current generator, aerodynamic noise time-frequency characteristics under different working conditions and the like are researched and analyzed; an experimental research method is adopted for verifying the aerodynamic noise characteristics of the alternating current generator; on such a basis, the noise reduction structure of the alternating current generator is optimized.

Description

technical field [0001] The invention belongs to the field of automobile noise reduction, and in particular relates to an automobile alternator noise simulation calculation method. Background technique [0002] As power equipment ranging from small machines to large machines, motors are used in a wide range of fields. With the rapid development of the economy and the improvement of people's living standards, the number of automobiles has increased rapidly in recent years. As one of the key components of automobiles, automobile motors have not only changed greatly in quantity and variety, but also in structure Great changes have also taken place. According to statistics, each ordinary car uses at least 15 micro-motors, luxury cars use 40-50 micro-motors, and luxury cars are equipped with 70-80 micro-motors. At present, automotive motors in the world have accounted for about 13% of the total micro motors. [0003] A car alternator is a device that converts mechanical energy ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of aerodynamic noise of alternators, the present invention provides an automotive alternator noise simulation calculation method, which studies and analyzes the far-field radiation aerodynamic noise characteristics of main aerodynamic noise sources, different turbulence models for alternator aerodynamic noise prediction, and different working conditions. time-frequency characteristics of aerodynamic noise, etc.

Images