A Measuring Method of Average Sound Absorption Coefficient of Reverberation Pool Wall

A technology of pool wall and sound absorption coefficient, which is applied to the analysis of solids, materials, and instruments using sound waves/ultrasonic waves/infrasonic waves. Easy operation and low uncertainty effect

Active Publication Date: 2022-01-07
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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  • A Measuring Method of Average Sound Absorption Coefficient of Reverberation Pool Wall
  • A Measuring Method of Average Sound Absorption Coefficient of Reverberation Pool Wall
  • A Measuring Method of Average Sound Absorption Coefficient of Reverberation Pool Wall

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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] Figure 6 Middle: 2-spherical transducer; 3-standard hydrophone; 4-measurement a...

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Abstract

The invention belongs to the field of acoustic measurement, and in particular relates to a method for measuring the average sound absorption coefficient of the wall of a reverberation pool, comprising the following steps: measuring the radiated sound power level SWL of a standard spherical sound source; measuring the spatial average sound pressure of a standard spherical sound source of the reverberation pool class <spl>; Measure the average sound absorption coefficient of the wall of the reverberation pool. The measurement method of the present invention is simple, easy to operate, and the experimental effect is obvious and easy to evaluate; compared with the method of measuring the sound absorption coefficient of the material by measuring the reverberation time in the reverberation chamber, the present invention simultaneously measures 128 points and performs spatial The measurement results are obtained by averaging, with higher efficiency and lower uncertainty; the invention solves the problem of accurate measurement of the average sound absorption coefficient of the reverberation pool wall, which is useful for understanding the pool constant of the reverberation pool and completing the calibration of the reverberation pool important meaning.< / spl>

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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