Engine gear howling noise identification method

Abstract

The invention discloses an engine gear howling noise identification method. The method comprises the following steps that step 1, an audio frequency when an engine operates is collected; 2, the audio frequency of the engine is converted into a color map; 3, according to the color map, the howling noise of the engine gear is manually recognized; 3.1, the starting frequency f1= w1 / 60*n of the order characteristic is calculated, w1 is the idling speed, n is the number of problem orders, and n is approximate to the tooth number of an engine gear; 3.2, an end frequency f2= w2 / 60*n of the order feature is calculated, wherein w1 is a calibrated rotating speed; and 3.3, whether an order oblique line exists in an area between f1 and f2 on the collomap or not is recognized, if yes, the engine gear generates howling noise, and if not, the engine gear does not generate howling noise, and the engine is qualified. The engine gear howling noise identification method can realize identification of engine gear howling noise, and is rapid in identification and high in precision.

Description

technical field [0001] The invention relates to a method for detecting engine NVH performance, in particular to an identification method for engine gear whistling noise. Background technique [0002] As users have higher and higher requirements for vehicle comfort, automobile manufacturers have increasingly stringent requirements for powertrain NVH (Noise, Vibration, Harshness, that is, noise, vibration, and harshness). During the production process of the engine, due to the influence of various factors of materials or assembly, the engine gear may produce whistling noise after the assembly is completed. At present, whether the engine gears whine can be judged subjectively by the inspectors. Since the sound of the engine contains the sounds produced by various parts, such as the whine of the supercharger, the inspectors are subject to other factors when subjectively judging the gear whine. Due to the interference of the sound, it is impossible to accurately judge whether th...

AI Technical Summary

Problems solved by technology

This evaluation method is used to judge engine supercharger whine. The noise frequency of supercharger whine and gear whine is different, so it cannot be used to judge engine gear whine. Moreover, the processing process of this evaluation method is complicated and the processing efficiency is low. It cannot be applied to the situation where the output of the production line is large

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