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다물체 연성효과를 고려한 부유체의 동적거동 안전성 해석
김영복,김무현,김용욱,Kim, Young-Bok,Kim, Moo-Hyun,Kim, Yong-Yook 대한조선학회 2009 大韓造船學會 論文集 Vol.46 No.6
Recently, there are several problems in space, contiguity and facility of the existing harbors issued due to the trend of enlarging the container capacity of the large container vessel, the Mobile Harbor has been proposed conceptually as an effective solution for those problems. This concept is a kind of transfer loader of the containers from the large container ship, which is a floating barge with a catamaran type in the underwater part, and so prompt maneuverability and work effectiveness. For the safe mooring of two floating bodies, a container and the mobile harbor, in the near sea apart from the quay, a robot arm mooring facility specially devised would be designed and verified through comparison study under various environmental sea condition in the inner and outer harbor. DP system (Dynamic Positioning System) using the azimuth thruster and a pneumatic fender, etc, will be considered as a next research topic for the mooring security of multi-body floaters.
$H^$\infty$$ Gain-Scheduling 기법을 이용한 컨테이너 크레인의 흔들임 제어에 관한 연구
김영복,정용길,Kim, Yeong-Bok,Jeong, Yong-Gil 제어로봇시스템학회 2001 제어·로봇·시스템학회 논문지 Vol.7 No.7
The sway control problem of the pendulum motion of a container hanging on the trolly, which transports containers from a container ship to trucks, is considered in the paper. In the container crane control problem, suppressing the residual swing motion of the container at the end of acceleration, deceleration or the case of that the unexpected disturbance input exists is main issue. For this problem, in general, the trolley motion control strategy is introduced and applied. In this paper, we introduce and synthesize a new type of swing motion control system in which a small auxiliary mass is installed on the spreader. The actuator reacting against the auxiliary mall applies inertial control forces to the container to reduce the swing motion in the desired manner. In this paper, we apply the $H^$\infty$$ based gain-scheduling control technique to the anti-swing motion control system design problem of the controlled plant. In this control system, the controller dynamics are adjusted in real-time according to time-varying plant parameters. And the simulation result shows that the proposed control strategy is shown to be useful for the case of time-varying system and, robust to disturbances such as winds and initial sway motion.
김영복(Young-Bok Kim),박준수(Jun-Soo Park),김용욱(Yong-Yook Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
In this study, the calculation scheme of workability by the evaluation of the motion response based on the wave scattered diagram on site was investigated for the prediction of the ability of on-board crane work on the mobile harbor deck. The Hanuri ship and Gunwoo barge were substituted for a container ship and the mobile harbor, respectively, for the numerical calculation and the site experiment. At first, the 6-DOF motion RAOs are calculated, and then the 6-DOF motion responses are obtained from the manipulation of the wave spectra based on the wave scattered diagram on site(Busan coastal area) and the 6-DOF motion RAOs, and the current and the wind effects are also reflected to a certain degree. Next, the workabilities are estimated based on the wave occurrence probability in the wave scattered diagram on site. The results could be used as the order instruction of on-board crane work of the mobile harbor according to the day weather forecasting report. The study result was verified by the on-site experiment in Busan coastal area.
컨테이너선과 다중 모바일하버의 유체동력학적 상호작용해석
김영복(Young-Bok Kim),김무현(Moo-Hyun Kim),김영훈(Young-Hun Kim),김용욱(Yong-Yook Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
As the size of container ships continues to increase, not many existing harbors can host the super-container ship with its increased draft and the corresponding dredging requires huge budget. In addition, the minimization of waiting and offloading time is the most important factor in harbor competitiveness. In this regard, mobile-harbor concept has been developed in Korea to achieve much improved harbor capacity and efficiency. In developing the concept, one of the most important elements is the operability of crane between two or more large floating bodies in side-by-side arrangement. The container ship is to be stationed through a hawser connection to a fixed-pile station at a near-shore region with the depth allowing its large draft. The mobile harbors with cranes are berthed to the side of its hull for container loading/offloading and transportation. The relative motions between the two or more floating bodies with hawser connection have to be within allowable range for the effective crane operation. Therefore, the reliable prediction of the relative motions of the multiple floating bodies with hawser/mooring/fender is essential to find the best hull particulars, hawser/mooring arrangement, and docking-station design. Time-domain multi-hull-mooring coupled dynamic analysis program is used to assess the global performance of the moored system and the hydrodynamic interactions among the multiple floating bodies. In particular, the behaviors of the whole system in non-collinear wind-wave-current environment are simulated and compared to those of collinear cases.
문지용,김영복,이지영,정기호,Moon, Ji-Yong,Kim, Young-Bok,Lee, Ji-Young,Jeong, Gi Ho 한국분석과학회 2001 분석과학 Vol.14 No.5
본 연구에서는 2000년 3월부터 9월까지 울산지역의 대기 중 미세먼지를 포집하여 중금속의 분포 특성을 살펴보고 그 오염 정도를 파악하고자 하였다. 시료는 마이크로파를 이용하여 전처리를 하였으며, 중금속(크롬, 구리, 아연, 카드뮴, 니켈, 비소, 그리고 납)에 대한 분석은 유도결합 플라스마 질량분석기를 사용하여 정량하였다. 대기 중 미세 먼지의 최대 양은 $85.6{\mu}g/m^3$로 타났으며 평균은 $37.1{\mu}g/m^3$였다. 각 중금속의 최대 농도는 철 $2.5{\mu}g/m^3$ (여천동), 아연 $0.41{\mu}g/m^3$ (남목2동), 카드뮴 $0.061{\mu}g/m^3$ (여천동), 납 $0.20{\mu}g/m^3$ (여천동), 니켈 $0.037{\mu}g/m^3$ (여천동), 구리 $0.88{\mu}g/m^3$ (야음동), 크롬 $0.042{\mu}g/m^3$ (야음동), 그리고 비소는 $0.015{\mu}g/m^3$ (온산)를 나타냈다. 중금속 농도 사이의 상관성을 살펴본 결과 남목2동에서 니켈과 아연이 상관계수 0.87로 가장 높은 상관관계를 나타내었다. In this study, we collected PM10(particulate matter less than $10{\mu}m$) by using a high volume air sampler from March 2000 to September 2000 to investigate the contamination level and the distribution characteristics of heavy metals in the ambient air in Ulsan area. Samples were pretreated by the microwave extraction methods, and heaby metals (Cr, Cu, Zn, Cd, Ni, As, and Pb) were quantified by using and ICP-MS system. The highest PM10 concentrations in the ambient air were $85.6{\mu}g/m^3$ and the aberage value was $37.1{\mu}g/m^3$. The maximum levels of each heavy metal were as follows: $2.5{\mu}g/m^3$ for Fe(Yeocheon-dong), $0.41{\mu}g/m^3$ for Zn(Nammok-2-dong), $0.061{\mu}g/m^3$ for Cd(Yeocheon-dong), $0.20{\mu}g/m^3$ for Pb(Yeocheon-dong), $0.037{\mu}g/m^3$ for Ni(Yeoncheon-dong), $0.88{\mu}g/m^3$ for Cu(Yaeum-dong), $0.042{\mu}g/m^3$ for Cr(Yaeum-dong), and $0.015{\mu}g/m^3$ for As(Onsan). Among concentration of heavy metals, Ni and Zn compounds were highly correlated with a correlation coefficient of 0.87 at Nammok-2-dong.