Noise source recognition method for vehicle acceleration noise

Abstract

The invention relates to a method for indentifying a noise source that produces noise when a vehicle accelerates, and belongs to the technical field of vehicle noise control. The method comprises the following steps: when the vehicle accelerates or travels at a uniform speed, the noise source signal, the vibration source signal, the speed signal, the response point sound pressure signal, the vehicle position signal and the like are collected; the transfer function matrix from the noise source and the vibration source to the response point is calculated; the changing response point sound pressure during the process of acceleration is synthesized and computed; and the sensitivity and the contribution degree of each noise source and vibration source are calculated. The invention has the following advantages: the noise source signal, the vibration source signal, the vehicle travelling state signal, and the ground response point sound pressure signal, which are collected during the running of the vehicle, can be utilized for accurately identifying the noise source that produces noise during the acceleration; and the quantitative relationship between the response point noise signal and each noise source is obtained and can provide a reliable basis for the reduction of noise produced by the acceleration of a running vehicle.

Description

Technical field [0001] The invention relates to a method for identifying a noise source of vehicle acceleration noise, and belongs to the technical field of vehicle noise control. Background technique [0002] Automobile noise is the main source of noise pollution. Many countries, including my country, have formulated strict regulations to control automobile noise (such as my country’s recently formulated national standard GB1495-2002). The reduction of automobile noise is an important factor in the development of today’s automobile technology. The subject has received extensive attention from all countries and major vehicle manufacturers and parts companies in the world. Accurate identification of the sound source is the key to reducing the acceleration noise outside the car. [0003] The current noise testing, including ISO362 testing and acoustic holography testing, uses different devices and methods. The former is like B&K's PULSE system (Vehicle pass-by noise test, www.bksv....

AI Technical Summary

Problems solved by technology

This test does not collect the noise source and vibration source information on the vehicle, but mainly records the relationship between the acceleration noise outside the vehicle and the vehicle running speed and accelerator operation, so the identification of the noise source outside the vehicle is not possible.

Acoustic holographic test (surface sound field analysis method of high-speed moving objects, invention patent 00132123.4 China) can test the surface sound field of the vehicle, but cannot identify the noise source and vibration source on the car corresponding to the sound field

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