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Title:: Advances in Acoustic Parameter Testing Technology of Underwater Acoustic Materials

Author(s):: CAO Zeng; TONG Haoyang; YI Yan; YAN Shiling; HUANG Weichun; LI Shui; CHEN Yi; ZHAO Han; 1.Hangzhou Institute of Applied Acoustics, National Defence Underwater Acoustic Metrology Center,Hangzhou 311400, China2.National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences,Nanjing University, Nanjing 210093, China

Keywords:: underwater acoustic materials; acoustic tube; free field; pressure tank; low frequency; high pressure; edge diffraction

Abstract:: Underwater acoustic material is the basis of underwater acoustic system capabilities, and its acoustic parameter testing technology is an important guarantee to ensure the functional realization of underwater acoustic material components. However, the current testing technology of underwater acoustic material components faces technical challenges brought by low frequency and high pressure. The acoustic tube testing of underwater acoustic material can be divided into the standing wave tube method, the pulse tube method and the traveling wave tube method. These three methods complement each other in terms of applicability. However, it is difficult to clarify the overall characteristics of the structure due to the small size of the test component, and the gap between the component and the pipe wall causes measurement inaccuracy.Free field test and pressure tank test technologies are effective methods for largearea underwater acoustic material testing, but there is a problem that the measurement accuracy is reduced due to the edge diffraction of test components. In this paper, the currently used underwater acoustic material testing technologies and their research status are reviewed. The difficulties and challenges of various testing technologies are discussed, and the future development direction of underwater acoustic material components testing is prospected.