Noise source separation method of uniform speed noise

Abstract

A noise source separation method of uniform speed noise comprises the steps of: obtaining a test value L of a sound pressure level in an outdoor road test vehicle running uniformly at a set speed; obtaining a test value L1 of the sound pressure level in the outdoor road test vehicle sliding at a neutral gear with the engine off; obtaining a test value L2 of the sound pressure level in the outdoor road test vehicle running uniformly at the set speed when the vehicle drives a hub in a semi-anechoic chamber; obtaining the test value L3 of the sound pressure level in the outdoor road test vehicle running at a uniform speed when the semi-anechoic chamber is in a neutral gear engine off state and the hub drives the vehicle; according to the test values L, L1, L2, and L3 of the sound pressure level in the outdoor road test vehicle, obtaining separated sound pressure levels and noise energy contribution ratios by means of calculation; and according to the sound pressure levels and noise energy contribution ratios, determining a main noise source. According to the invention, the noise sources in the uniformly running process of the vehicle are separated, so that the NVH performance of the whole vehicle can be rapidly and effectively optimized, the noise of the whole vehicle is reduced, and the performance and the comfort of the vehicle are improved.

Description

technical field [0001] The invention relates to the field of noise detection, in particular to a noise source separation method for uniform velocity noise. Background technique [0002] With the development of today's automobile market, NVH (Noise, noise; Vibration, vibration; Harshness, roughness) performance has gradually become an important factor for people to consider when buying a car, and the uniform speed noise inside the car is an important factor for evaluating the overall performance. An important factor in vehicle NVH performance. [0003] The noise inside the car at a constant speed mainly includes the powertrain noise, tire noise, wind noise, and road noise transmitted to the car. Existing separation methods for uniform velocity noise mainly rely on the experience of NVH engineers, including spectrum analysis and subjective evaluation methods. Specific contributions of assembly noise, tire noise, wind noise, and road noise. Such as figure 1 As shown in the ...

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Problems solved by technology

Existing separation methods for uniform velocity noise mainly rely on the experience of NVH engineers, including spectrum analysis and subjective evaluation methods. Specific contributions of assembly noise, tire noise, wind noise, and road noise

like figure 1 As shown in the figure, the noise spectrogram of a certain car when driving at a constant speed of 100km/h can be seen from the spectrogram that the noise inside the car is relatively high near the center frequencies of 80Hz and 700Hz. is the powertrain noise, but it is not possible to obtain the ratio of r

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