Acoustic pressure simulation and experiment design in seafloor mining environment

作     者：ZHAO Hai-ming WANG Yan-li HAN Feng-lin JI Ya-qian LUO Bo-wen 赵海鸣;壬艳丽;韩奉林;姬雅倩;罗柏文

作者机构：School of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China State Key Laboratory of High Performance Complex ManufacturingCentral South UniversityChangsha 410083China ~.National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety TechnologyHunan University of Science and TechnologyXiangtan 411201China ~ Central South University Press and Springer-Verlag GmbH Germanypart of Springer Nature 201 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2018年第25卷第6期

页      面：1409-1417页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0804[工学-仪器科学与技术] 

基　　金：Project(51374245) supported by the National Natural Science Foundation of China Project(10C0681) supported by Education Department of Hunan Province, China 

主　　题：seafloor mining acoustic pressure KZK equation turbid seawater sound attenuation 

摘      要：Since the suspended sediments have severe influence on acoustic radiated field of transducer, it is significant for sonar system to analyze the influence of suspended sediments on acoustic pressure in the seafloor mining environment. Based on the KZK （Khokhlov-Zabolotkaya-Kuznetsov） equation, the method of sound field analysis in turbid water is proposed. Firstly, based on the analysis of absorption in clean water and viscous absorption of suspended sediments, the sound attenuation coefficient as a function of frequency in the mining environment is calculated. Then, based on the solution of KZK equation in frequency domain, the axial sound pressure of transducer in clear water as well as turbid water is simulated using MATLAB. Simulation results show that the influence of the suspended sediments on the pressure of near field is negligible. With the increase of distance, the axial sound pressures of transducer decay rapidly. Suspended sediments seriously affect the pressure in far-field. To verify the validity of this numerical method, experiment is designed and the axial sound pressure of transducer with a frequency of 200 kHz and a beam width of 7.5~ is measured in simulated mining experiment. The results show that the simulation results agree well with the experiments, and the KZK equation can be used to calculate the sound field in turbid water.