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구범우,Su Y. Choi,최영수,Guowei Cai,Lakmal Seneviratne,임춘택 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.4
In this paper, new tethered aerial robots including roaming tethered aerial robots (RTARs)for radioactive material sampling and stationary tethered aerial robots (STARs) for environmentmonitoring are proposed to meet extremely-long-endurance missions of nuclearpower plants. The flight of the proposed tethered aerial robots may last for a few days oreven a few months as long as the tethered cable provides continuous power. A high voltageAC or DC power system was newly adopted to reduce the mass of the tethered cable. TheRTAR uses a tethered cable spooled from the aerial robot and an aerial tension controlsystem. The aerial tension control system provides the appropriate tension to the tetheredcable, which is accordingly laid down on the ground as the RTAR roams. The STAR includesa tethered cable spooled from the ground and a ground tension control system, whichenables the STAR to reach high altitudes. Prototypes of the RTAR and STAR were designedand successfully demonstrated in outdoor environments, where the load power, powertype, operating frequency, and flight attitude of the RTAR and STAR were: 180 W, AC100 kHz, and 20 m; and 300 W, AC or DC 100 kHz, and 80 m, respectively.
이은수,구범우,이수길 한국철도학회 2020 한국철도학회논문집 Vol.23 No.3
In order to sense the distance between a leading train and a lagging train driving through a railroad track and prevent a rear-ender, a distance sensing system between trains, which adopts the magnetic induction method, is newly proposed in this paper. The proposed system can be adopted by all railroad systems having a conventional railroad track, and utilized independently together with a track circuit, ATC (Auto Train Control), ATS (Auto Train Stop), and CBTC (Communication Based Train Control), which systems are currently used to detect the positions of trains. To increase the magnetic coupling between Tx (Transmitter) & Rx (Receiver) coils and the railroad track, U-shaped dipole coils for Tx and Rx are used. Such Tx & Rx coils can be installed easily in the train so that the magnetic field generated from the track can be highly linked to the Rx coil. In this paper, the feasibility of the proposed system was verified using a Maxwell 3D simulation tool; results showed that the induced voltage in the Rx coil increases when the distance between trains decreases. As a result, 12.5V and 1.6V load voltages were obtained for d 12 = 10 m and 100 m, respectively, when the size of 6.810 -3 (m 3 ) for the Tx and Rx coils is adopted.