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Acoustic pressure simulation and experiment design in seafloor mining environment

海底采矿环境下声场建模及实验设计

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Abstract

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.

摘要

针对海底采矿环境下, 悬浮泥沙对换能器声场分布影响严重的问题, 基于KZK (Khokhlov-Zabolotkaya-Kuznetsov)方程,提出了混浊水域中声场分析方法。首先,对清洁水域声吸 收和悬浮泥沙引起的粘滞声吸收进行分析,并由此建立采矿环境下声衰减系数随频率变化的规律曲 线。然后,利用MATLAB,通过KZK 方程的频域求解方法,对清洁水域和混浊水域中换能器轴向声 场进行数值计算。仿真结果表明,悬浮泥沙对近场距离内轴向声压的影响不大,而随着距离的增大, 换能器轴向声压幅值很快衰减,悬浮泥沙使远场区声压幅值严重降低。模拟采矿实验测量频率为 200 kHz,波束角为7.5°换能器的轴向声压分布,结果表明,仿真结果与实验结果的一致性较好,KZK 方程可以有效描述混浊水域中的声场分布。

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Hai-ming Zhao  (赵海鸣), Yan-li Wang  (王艳丽), Feng-lin Han  (韩奉林) & Ya-qian Ji  (姬雅倩)

  2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China

    Hai-ming Zhao  (赵海鸣) & Feng-lin Han  (韩奉林)

  3. National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology, Hunan University of Science and Technology, Xiangtan, 411201, China

    Bo-wen Luo  (罗柏文)

Authors
  1. Hai-ming Zhao  (赵海鸣)
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  2. Yan-li Wang  (王艳丽)
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  3. Feng-lin Han  (韩奉林)
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  4. Ya-qian Ji  (姬雅倩)
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  5. Bo-wen Luo  (罗柏文)
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Corresponding author

Correspondence to Feng-lin Han  (韩奉林).

Additional information

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

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Zhao, Hm., Wang, Yl., Han, Fl. et al. Acoustic pressure simulation and experiment design in seafloor mining environment. J. Cent. South Univ. 25, 1409–1417 (2018). https://doi.org/10.1007/s11771-018-3836-2

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  • DOI: https://doi.org/10.1007/s11771-018-3836-2

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