Train through passage sound insulation property testing method based on reverberation room and anechoic room

Abstract

The invention discloses a train through passage sound insulation property testing method based on a reverberation room and an anechoic room, and belongs to the field of the sound insulation property measurement method of a rail train through passage device. The method comprises the following steps that: firstly, constructing a joint acoustical laboratory which is big enough to contain a tested train through passage and comprises the reverberation room and the anechoic room, giving a specific anechoic room construction index, definitely giving the specific arrangement positions of a non-direction sound source used for generating reverberation field stimulation and three reverberation field microphones, definitely giving the layout position and the sound insulation property index parameter of a sound insulation plugging tool, and also giving an empirical formula used for calculating a train through passage sound insulation amount under the environment of the reverberation room and the anechoic room. By use of the method, in virtue of the insulation function of the anechoic room for environment noise, external disturbances are avoided, the accuracy of acoustic data is greatly improved, and the data analysis and calculation of the train through passage sound insulation property testing method based on the environment of the reverberation room and the anechoic room can be implemented.

Description

technical field [0001] The invention belongs to the field of sound insulation performance measurement methods for rail passenger car passageway devices, and in particular relates to a method for testing sound insulation performance of train passageways based on reverberation chambers and anechoic chambers. Background technique [0002] Prior art related to this patent one [0003] Such as figure 1 As shown, the passageway 1 of the rail passenger car is a scalable flexible passageway similar to an accordion bellows structure, which is formed by connecting multiple link frames in series through flexible skins. Curves on the track are possible. [0004] In order to optimize the noise reduction performance of the through channel, it is necessary to carry out the acoustic test of the sound insulation performance, so as to obtain the sound insulation performance parameters of the through channel, which can be used as the basis for noise reduction optimization. [0005] The seco...

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Problems solved by technology

[0025] In order to solve the problem that the existing through-channel sound insulation performance test method based on the reverberation-reverberation chamber and its sound pressure-sound pressure method is not sufficient due to the large volume of the through-channel and its flexible expansion characteristics. The huge reverberation-reverberation chamber that accommodates the entire through-channel, but only half of the through-channel structure is tested. Therefore, the experimental results cannot completely replace the sound insulation characteristics analysis results of the complete through-channel, and the confidence level is not ideal; As well as the existing sound pressure-sound pressure method's algorithmic formula is not reasonable enough, the error is large, and the analysis speed is relatively slow. The present invention provides a method for testing the sound insulation performance of train passages based on reverberation chambers and anechoic chambers.

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