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수중 Surveillance 시스템용 압전 복합 재료를 이용한 초음파 트랜스듀서의 설계
채민구(Min-Gu Chae),김대환(Dae-Han Kim),김영진(Young-Jin Kim),조영준(Young-June Cho),표기형(Gi-Hyong Pyo),우종식(Jong-Sik Woo),장미경(Mi-Kyung Jang),박상진(Sang-Jin Park),이재익(Jae-Ik Lee) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.4
FSRU(Floating Storage and Regasification Unit : 부유식 LNG 처장 및 재기화 플랜트) 주변 수중의 영상을 획득하여 접근 물체에 대한 감시 및 경보 시스템으로 수중 Surveillance 시스템이 필요하다. 이 시스템용 Transducer의 압전재료로 Piezo composite를 이용하여 대역폭을 증가시키고 압전 세라믹 대비 side lobe가 개선되도록 설계 및 제작하고, 수조에서 TVR, RVS, Beam pattern을 측정함으로써 설계 사양을 검중하였다.
FSRU LNGC 병렬계류를 위한 간격정보 검출 알고리즘 개발
김영진(Young-Jin Kim),조영준(Young-June Cho),장미경(Mi-Kyung Jang),박상진(Sang-Jin Park),표기형(Gi-Yong Pyo),우종식(Jong-Sik Woo),채민구(Min-Gu Chae),김대환(Dae-Han Kim),이재익(Jae-Ik Lee) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.4
When a LNGC(Liquefied Natural Gas Carrier) comes alongside a FSRU(Floating Storage Regasification Unit) in order to off-load, LNG may be in danger of explosion. Such being the case, it is critical to maintain the tension of the mooring line between FSRU and LNGC. And while it is mooring, a jackknifing effect may occur due to currents and waves, by which the mooring line tension of the bow may increase and the fender of the stem may be overloaded. In the case of the present side-by-side mooring, the pretension of the mooring line depends on the operator's' intuition, and then during off-loading, it is not managed particularly for safety. And when an unallowable tension is applied to the ORH(Quick Release Hook) due to outward influence, the mooring line is released from QRH and the loading arm is also separated automatically. The load cell may malfunction in that it measures the interval between floating units only with the tension of the mooring line. In such a case, it becomes difficult to check the interval between vessels and thus becomes impossible to maintain the tension continuously. Accordingly in this study, a safe berthing control system was developed by the use of the two-dimensional scanning LASER, the displacement sensor and the underwater ultrasonic sensor, and an interval detecting algorithm was developed for the side-by-side mooring. In comparison with previous systems, they are expected to stably control the tension of the mooring line between a FSRU and a LNGC and to effectively control the mooring of vessels.