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Measuring method for average sound absorption coefficient of reverberation pool wall surface

A technology of pool wall and sound absorption coefficient, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, instruments, and analyzed materials, etc., can solve the problems of differences in acoustic characteristics of reverberation pools, difficulty in measuring reverberation time, etc., to achieve easy evaluation, Easy operation, obvious experimental effect

Active Publication Date: 2019-02-12
HARBIN ENG UNIV
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Problems solved by technology

[0004] To sum up, since the ratio of the impedance of the water in the reverberation pool to the impedance of the wall of the reverberation pool is between 2-6 times, the absolute hard boundary conditions are not satisfied, which leads to the fact that the acoustic characteristics of the reverberation pool are different from those of the reverberation chamber. At the same time, the reverberation time in the reverberation pool is much smaller than the reverberation time in the reverberation room under the same conditions, which also brings difficulties to the measurement of the reverberation time. No one has measured the absorption of the reverberation pool wall. Sound coefficient

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  • Measuring method for average sound absorption coefficient of reverberation pool wall surface
  • Measuring method for average sound absorption coefficient of reverberation pool wall surface
  • Measuring method for average sound absorption coefficient of reverberation pool wall surface

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Embodiment Construction

[0066] The present invention will be further described below in conjunction with the accompanying drawings.

[0067] figure 1 Middle: 1-Anechoic pool; 2-Spherical transducer; 3-Standard hydrophone; 4-Measurement amplifier; 5-Multi-channel test system; 6-First computer; 7-Second computer; 8-Acquisition Device; 9-power amplifier; 10-sound-absorbing wedge;

[0068] figure 2 Middle: 2-spherical transducer; 4-measurement amplifier; 5-multi-channel test system; 6-first computer; 7-second computer; 8-collector; 9-power amplifier; 11-non-anechoic pool ;12-128 hydrophone arrays;

[0069] image 3 Middle: 3-standard hydrophone; 11-non-anechoic pool; 12-128 hydrophone array;

[0070] Figure 4 Middle: 2-spherical transducer; 11-non-anechoic pool; 12-128 hydrophone arrays;

[0071] Figure 5 Middle: 2-spherical transducer; 11-non-anechoic pool; 12-128 hydrophone arrays;

[0072] Image 6 Middle: 2-spherical transducer; 3-standard hydrophone; 4-measurement am...

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Abstract

The invention belongs to the field of acoustic measurement, and specifically relates to a measuring method for the average sound absorption coefficient of a reverberation pool wall surface. The measuring method comprises the following steps: measuring standard spherical sound source radiation sound work level SWL; measuring the average sound pressure level (SPL) of a reverberation pool standard spherical sound source space; and measuring the average sound absorption coefficient of the reverberation pool wall surface. The measuring method is simple, easy in operation, obvious in experiment effect and easy to assess; compared with a method for measuring the sound absorption coefficient of a material by measuring reverberation time in a reverberation room, space average measurement is carriedout on 128 points simultaneously to obtain a measuring result, the efficiency is higher, and the uncertainty is lower; and the measuring method solves the problem of accurate measurement for the average sound absorption coefficient of the reverberation pool wall surface, so that the method is of significance in understanding the pool constant of a reverberation pool and completing the calibrationof the reverberation pool.

Description

technical field [0001] The invention belongs to the field of acoustic measurement, in particular to a method for measuring the average sound absorption coefficient of the wall surface of a reverberation pool. Background technique [0002] The wall of the reverberation chamber in the air is considered to be an absolute hard boundary, and the sound absorption coefficient of the wall is close to zero. The wall of the reverberation pool has a large absorption, and the wall does not meet the absolute hard boundary conditions. Knowing the sound absorption coefficient of the reverberation pool wall is of great significance for the study of the sound field characteristics in the reverberation pool and the measurement of the sound power radiated by the sound source in the reverberation pool. [0003] The sound absorption coefficient is an important parameter to characterize the acoustic performance of the reverberation pool wall. There are many methods for measuring the sound absor...

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/023
Inventor 尚大晶李琪唐锐任超朱杰
Owner HARBIN ENG UNIV
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