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Chin. Phys. B, 2023, Vol. 32(5): 054303    DOI: 10.1088/1674-1056/acb75c
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Method for measuring the low-frequency sound power from a complex sound source based on sound-field correction in a non-anechoic tank

Hongzhe Xu(徐宏哲)1,2,3, Qi Li(李琪)1,2,3, Rui Tang(唐锐)1,2,3,†, and Dajing Shang(尚大晶)1,2,3
1 Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China;
2 Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University), Ministry of Industry and Information Technology, Harbin 150001, China;
3 College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
Abstract  Similar to air reverberation chambers, non-anechoic water tanks are important acoustic measurement devices that can be used to measure the sound power radiated from complex underwater sound sources using diffusion field theory. However, the problem of the poor applicability of low-frequency measurements in these tanks has not yet been solved. Therefore, we propose a low-frequency acoustic measurement method based on sound-field correction (SFC) in an enclosed space that effectively solves the problem of measuring the sound power from complex sound sources below the Schroeder cutoff frequency in a non-anechoic tank. Using normal mode theory, the transfer relationship between the mean-square sound pressure in an underwater enclosed space and the free-field sound power of the sound source is established, and this is regarded as a correction term for the sound field between this enclosed space and the free field. This correction term can be obtained based on previous measurements of a known sound source. This term can then be used to correct the mean-square sound pressure excited by any sound source to be tested in this enclosed space and equivalently obtain its free-field sound power. Experiments were carried out in a non-anechoic water tank (9.0 m m×3.1 m m×1.7 m) to confirm the validity of the SFC method. Through measurements with a spherical sound source (whose free-field radiation characteristics are known), the correction term of the sound field between this water tank and the free field was obtained. On this basis, the sound power radiated from a cylindrical shell model under the action of mechanical excitation was measured. The measurement results were found to have a maximum deviation of 2.9 dB from the free-field results. These results show that the SFC method has good applicability in the frequency band above the first-order resonant frequency in a non-anechoic tank. This greatly expands the potential low-frequency applications of non-anechoic tanks.
Keywords:  non-anechoic tank      complex sound source      sound-field correction      low-frequency sound power  
Received:  08 August 2022      Revised:  01 December 2022      Accepted manuscript online:  31 January 2023
PACS:  43.30.+m (Underwater sound)  
  43.58.+z (Acoustical measurements and instrumentation)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11874131) and Open Fund Project of Key Laboratory of Underwater Acoustic Countermeasures Technology (Grant No. 2021-JCJQ-LB033-05).
Corresponding Authors:  Rui Tang     E-mail:  tangrui@hrbeu.edu.cn

Cite this article: 

Hongzhe Xu(徐宏哲), Qi Li(李琪), Rui Tang(唐锐), and Dajing Shang(尚大晶) Method for measuring the low-frequency sound power from a complex sound source based on sound-field correction in a non-anechoic tank 2023 Chin. Phys. B 32 054303

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