General Information
    • ISSN: 1793-821X
    • Frequency: Quarterly (2013-2014); Bimonthly (Since 2015)
    • DOI: 10.18178/JOCET
    • Editor-in-Chief: Prof. Haider F. Abdul Amir
    • Executive Editor: Ms. Julia S. Ma
    • Abstracting/ Indexing: EI (INSPEC, IET), Electronic Journals Library, Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, Google Scholar, ProQuest and DOAJ.
    • E-mail: jocet@ejournal.net
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Editor-in-chief
School of Science and Technology Universiti Malaysia Sabah, Malaysia.
I would like to express my appreciation to all authors, reviewers and edtors.
JOCET 2017 Vol.5(4): 314-319 ISSN: 1793-821X
DOI: 10.18178/JOCET.2017.5.4.390

Operating Frequency of Cobalt-Rich Crust Micro-terrain Detection in Simulative Deep-Sea Mining

Haiming Zhao, Yaqian Ji, and Qi Hao
Abstract—In the real-time micro-terrain detection of deep-sea cobalt-rich crust, the sonar detection performance is seriously influenced by the suspended sediments stirred up by the mining hob. To analyze the optimum detection frequency in deep-sea mining environment, a simulative system of deep-sea mining was built in laboratory. The acoustic attenuation in simulative deep-sea mining was calculated using the parameters measured in experiment, such as the temperature, salinity and concentration of suspended sediments. On this basis, the transmission loss and the volume reverberation were studied as a function of detection frequency and suspended sediment concentrations with a detection distance of two meters. Subsequently, the optimum detection frequency in severe reverberation environment was calculated with the help of active sonar equation. With the further consideration of vertical detection accuracy, the detection frequency in simulative deep-sea mining was finally determined. Results indicate that: 1) in simulative deep-sea mining,the suspended sediments induced acoustic attenuation and volume reverberation have a significant effect on detection frequency and cannot be ignored; the impact of suspended sediments on acoustic attenuation is much greater than volume reverberation; 2) both the transmission loss and the volume reverberation increase with increasing suspended sediment concentrations and detection frequency, and the detection frequency of the sonar detection system decreases with increasing particle concentrations; 3)the detection frequency in simulative deep-sea mining environment is confirmed to be 158KHz by taking acoustic attenuation, volume reverberation and vertical detection accuracy into account.

Index Terms—Simulative deep-sea mining, cobalt-rich crust, suspended sediments, acoustic attenuation, volume reverberation, detection frequency.

Haiming Zhao is with State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083 China (e-mail: zhm0097@126.com).
Yaqian Ji and Qi Hao are with School of Mechanical and Electrical Engineering, Central South University, Changsha 410083 China (e-mail: saqlag_yaqian@sina.cn, qicai321@sina.com).

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Cite:Haiming Zhao, Yaqian Ji, and Qi Hao, "Operating Frequency of Cobalt-Rich Crust Micro-terrain Detection in Simulative Deep-Sea Mining," Journal of Clean Energy Technologies vol. 5, no. 4, pp. 314-319, 2017.

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