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Cable switching and fault isolation 1

Cabled seafloor observatories 1

Coded voltage signal 1

Constant current input 1

Embedded processor 1

IEEE 1588 1

Junction boxes 1

Maximum bit frequency 1

Non-ideal power supply 1

Ocean observation system 1

Power monitoring and protection 1

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air–sea interface observation 1

ambient vibration 1

deep-sea observation platform 1

equipment development 1

formation mechanisms 1

instability analysis 1

marine scientific equipment 1

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Use of a coded voltage signal for cable switching and fault isolation in cabled seafloor observatories None

Zhi-feng ZHANG, Yan-hu CHEN, De-jun LI, Bo JIN, Can-jun YANG, Jun WANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 11, Pages 1328-1339 doi: 10.1631/FITEE.1601843

Abstract:

Cabled seafloor observatories play an important role in ocean exploration for its long-term, real-timeIn establishing a permanent, reliable, and robust seafloor observatory, a highly reliable cable switching

Keywords： Cabled seafloor observatories Cable switching and fault isolation Coded voltage signal Maximum bit frequency

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Developing a power monitoring and protection system for the junction boxes of an experimental seafloor

Jun WANG,De-jun LI,Can-jun YANG,Zhi-feng ZHANG,Bo JIN,Yan-hu CHEN

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 12, Pages 1034-1045 doi: 10.1631/FITEE.1500099

Abstract: system based on an embedded processor was designed for the junction boxes (JBs) of an experimental seafloor

Keywords： Power monitoring and protection Embedded processor Seafloor observatory network IEEE 1588 Junction

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Vibration testing of a steel girder bridge using cabled and wireless sensors

Dapeng ZHU, Yang WANG, James BROWNJOHN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3, Pages 249-258 doi: 10.1007/s11709-011-0113-y

Abstract: Nineteen wireless and nineteen cabled accelerometers are first installed along the sidewalk of two neighboringThe performance of the wireless sensing system is compared with the high-precision cabled sensing system

Keywords： wireless sensing structural health monitoring (SHM) signal conditioning operating deflection analysis ambient vibration

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Progress and Prospect of Seafloor Instability Research

Gao Weijian, Li Wei

Strategic Study of CAE 2023, Volume 25, Issue 3, Pages 109-121 doi: 10.15302/J-SSCAE-2023.03.010

Abstract:

Seafloor instability and secondary submarine geohazards are widely presentHowever, formation mechanisms and controlling factors of seafloor instability are still poorly understoodTo improve the understanding, based on the history and development of seafloor instability, thisfactors, and engineering geohazards risks, and summarizes popular quantitative analysis methods for seafloorseabed instability, this study proposed the development direction and countermeasures of future seafloor

Keywords： seafloor instability submarine geohazards formation mechanisms risk assessment instability analysis

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Research Progress of Marine Scientific Equipment and Development Recommendations in China

Song Xiancang, Du Junfeng, Wang Shuqing, Li Huajun

Strategic Study of CAE 2020, Volume 22, Issue 6, Pages 76-83 doi: 10.15302/J-SSCAE-2020.06.010

Abstract: platforms, namely air–sea interface observation platform, mobile underwater observation platform, and seafloorsuch as the marine remote-sensing satellites, marine research ships, deep-diving submersibles, and seafloor

Keywords： equipment deep-sea observation platform air–sea interface observation mobile underwater observation seafloor

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Optimal communication frequency for switching cabled ocean networks with commands carried over the power Research Article

Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10, Pages 1331-1343 doi: 10.1631/FITEE.1900125

Abstract: s with tree or ring topologies play an important role in real-time ocean exploration. Due to the time-consuming need for field maintenance, technology that can actively switch the power on/off on certain branches of the network becomes essential for enhancing the reliability and availability of the network. In this paper, a novel switching-control method is proposed, in which we invert the power transmission polarity and use the current on the power line as the digital signal at low frequency to broadcast information with the address and commands to the network, and the corresponding (BU) can decode and execute the switching commands. The cable’s parasitic parameters, the network scale, and the number of BUs, as the influencing factors of the on the power line, are theoretically studied and simulated. An optimized frequency that balances the executing accuracy and rate is calculated and proved on a simulated prototype. The results showed that the technology with optimized frequency can enhance the switching accuracy and configuring rate.

Keywords：海缆开断；海洋观测网；分支单元；传输线理论；通信频率

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A new approach for analyzing the effect of non-ideal power supply on a constant current underwater cabled Personal View

Yu-jia ZANG, Yan-hu CHEN, Can-jun YANG, De-jun LI, Ze-jian CHEN, Gul MUHAMMAD

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 4, Pages 604-614 doi: 10.1631/FITEE.1800737

Abstract: The effect of a constant current (CC) power supply on the CC ocean observation system is a problem that once was neglected. The dynamic characteristics of the CC power supply may have great influence on the whole system, especially the voltage behavior in the event of load change. This needs to be examined. In this paper, a method is introduced to check whether the CC power supply can satisfy the dynamic requirements of the CC ocean observation system. An equivalent model to describe the non-ideal CC power supply is presented, through which the dynamic characteristics can be standardized. To verify the feasibility of this model, a minimum system of a single node in the CC ocean observation system is constructed, from which the model is derived. Focusing on the power failure problem, the output voltage responses are performed and the models are validated. Through the model, the dynamic behavior of the CC power supply is checked in a practical design.

Keywords： Non-ideal power supply Constant current input Ocean observation system