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Chin. Phys. B, 2022, Vol. 31(6): 064302    DOI: 10.1088/1674-1056/ac3812

Improving sound diffusion in a reverberation tank using a randomly fluctuating surface

Qi Li(李琪)1,2,3, Dingding Xie(谢丁丁)1,2,3, Rui Tang(唐锐)1,2,3,†, Dajing Shang(尚大晶)1,2,3, and Zhichao Lv(吕志超)4
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;
4 College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China
Abstract  Underwater reverberation environments that satisfy the conditions of uniformity and isotropy of the diffuse field can be used to measure the acoustic characteristics of underwater targets. This study combines two practical indicators — the standard deviation of the absolute sound pressure field (to indicate uniformity) and the analysis of the wavenumber spectrum in the spherical harmonics domain (to indicate isotropy) — for an accurate evaluation of the diffusion of the sound field in a reverberation tank. A method is proposed that can improve the narrow-band diffusion of the sound field by employing a randomly fluctuating surface. An acoustic experiment was performed in a reverberation water tank (1.2 m×1 m×0.8 m), where a randomly fluctuating surface was generated by making waves. The experimental results show that as the wave motion contributes effectively to the random reflection of sound rays in all directions, the uniformity and isotropy are improved significantly when the surface is fluctuating randomly. This work helps to ensure accurate measurements of the characteristics of underwater targets in reverberation tanks.
Keywords:  sound diffusion      reverberation tank      randomly fluctuating surface      acoustic measurements  
Received:  30 July 2021      Revised:  17 October 2021      Accepted manuscript online:  10 November 2021
PACS:  43.30.+m (Underwater sound)  
  43.58.+z (Acoustical measurements and instrumentation)  
  43.55.+p (Architectural acoustics)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11874131).
Corresponding Authors:  Rui Tang     E-mail:

Cite this article: 

Qi Li(李琪), Dingding Xie(谢丁丁), Rui Tang(唐锐), Dajing Shang(尚大晶), and Zhichao Lv(吕志超) Improving sound diffusion in a reverberation tank using a randomly fluctuating surface 2022 Chin. Phys. B 31 064302

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