Safety Analysis of Underwater Ultra-Long Fiber Optical Micro- Cables
- Xuesong Xu (Shanghai Jiaotong University) | Yan Meng (Shanghai Jiaotong University)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- cable dynamics, underwater vehicle, Fiber cable, safety analysis
- 0 in the last 30 days
- 24 since 2007
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The Fiber Optical Micro- Cable (FOMC) provides much facility for the operation of the deepsea Autonomous Remotely Vehicle (ARV). It avoids the expensive umbilical cable and the heavy winch which are necessary for the conventional Remotely Operated Vehicle (ROV). Due to the small diameter and low weight of FOMC, the deepsea ARV can get a large range of motion and much high maneuverability. However, the fiber optical micro-cable deployed in the deepsea ARV system is very long (>5000m), and is fragile to be broken by the current and the ARV motion. In that case, the underwater vehicle will miss communication with the supporting system on the mother ship, and lose in the ocean. To avoid this kind of disaster, the safety of the underwater fiber optical micro-cable should be analyzed before the underwater operation. The motion of the fiber optical micro-cable is simulated by a numerical calculation method. The shapes and tensions of the micro-cable are shown. A lot of practical conclusions are drawn. The dangerous cases for the ultra-long fiber optical micro-cable are highlighted to be avoided in the operations.
The FOMC has been widely used in a real-time control of underwater vehicle system. FOMC is a combination of an optical fiber for communicating and surrounding materials for providing tensile strength. Due to its small diameter, rapid signal transmission and good signal stability, FOMC is increasingly applied to the communication between supporting ship and underwater vehicles. Compared with traditional heavy cable, the advantages of using FOMC as a connection are as follows: (1) reducing the requirements for the winch and the supporting ship in surface; (2) enlarging the range of underwater vehicle motion and improving the maneuverability due to its low water resistance; (3) increasing the speed of signal transmission; (4) lowering the cost of underwater vehicle system.
Aoki et al. (1999) verified that the ”UROV7K” system developed by JAMSTEC enables high-speed communication with supporting vessels with light cable of diameter less than 1 mm, with the operators onboard operating the submersible vehicle through video. Similarly, Webster and Bowen (2003) demonstrated the feasibility of deploying a FOMC of 0.8 mm diameter in a real-time remote control solution of a hybrid remotely operated vehicle (HROV), which is a new type of underwater vehicle, and can be used both as a conventional ROV by connecting cable and as an untethered Autonomous Underwater Vehicle (AUV). By conducting a series of field tests, Young et al. (2006) validated the feasibility and utility of using a buffered fiber as a connection in the ROV mode.
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