Method for measuring and calculating reverberation time in vehicle

Abstract

The invention provides a method for measuring and calculating the reverberation time in a vehicle. The method comprises a step S1 of calculating an original average value of the measured sound source sound pressure; a step S2 of setting a first value of the sound source sound pressure before attenuation and a second value after attenuation at each measuring point in the vehicle respectively according to the original average value of the sound source sound pressure; a step S3 of calculating the sound pressure attenuation slope at each measuring point according to the difference between the first value and the second value and the time of linear attenuation from the first value to the second value; and a step S4 of calculating the reverberation time of the measuring points according to the sound pressure attenuation slope at each measuring point. According to the invention, the average reverberation time in the vehicle is calculated according to the sound pressure attenuation slope, and in this way, the acoustical absorption coefficient of acoustic materials in the vehicle can be evaluated, so as to provide a basis for analyzing and improving the acoustic absorption property of the acoustic materials. In addition, the process is completed when the vehicle is in a static state, no frequent road test is required, the manpower and material resources and the cost are saved, and repeated verification and continuous improvement are carried out at all stages of development.

Description

Technical field [0001] The present invention relates to the technical field of automobile acoustics, in particular to a method for measuring and calculating the average reverberation time in a vehicle. Background technique [0002] In the process of automotive acoustic engineering development, the noise technical index system is generally set according to the in-vehicle acoustic performance of the market competing models. Obviously, the acoustic performance of the car directly depends on the human ear's auditory perception process of sound events, during which people make subjective judgments about the noise in the car. However, for automotive acoustic engineers, it is not enough to evaluate the acoustic characteristics of vehicles subjectively. Prior to this, acousticians have studied many objective acoustic parameters to describe sound quality, which provides important information for evaluating and improving the acoustic performance of vehicles. in accordance with. There are...

AI Technical Summary

Problems solved by technology

If the reverberation time is to be used to analyze and improve the listening environment in the car, several road tests are required for debugging or verification, which not only complicates the process, but also consumes a lot of manpower and material resources, which is very uneconomical

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