• 기계와재료
• /
• v.24 no.2
• /
• pp.62-71
• /
• 2012

세계적으로 NOx 저감 및 규제치의 강화로 인해 디젤기관에서 발생되는 NOx 제거에 대한 연구가 활발히 진행 중이며, 암모니아 환원제와 배출가스의 NOx를 혼합하여 촉매 존재하에서 NOx를 제거하는 시스템이 개발되고 있다. 대부분 암모니아를 보관성이 용의한 요소(Urea) 수용액으로 대체하여 배기관 내에 직접 요소수를 분사하며 요소 수용액이 고온의 배기가스에 의해 증발되어 암모니아를 환원시키며, 촉매를 통하여 탈질을 하는 Urea-SCR 시스템을 채택하고 있다. 따라서 촉매전단에서 요소수가 완전히 증발되고, 또한 촉매 입구에서 요소수의 증발로 인해 환원된 암모니아의 분포도 균일해야 함으로 Urea-SCR 시스템이 배기가스 유동 및 온도에 최적화된 분무특성을 가지는 분사제어 시스템을 제시하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2017.11a
• /
• pp.204-205
• /
• 2017

항로표지는 선박의 안전과 운항능률의 증진에 필수적인 수단으로 해상교통에 필수적이다. 등명기는 육상 및 해상에서 광파표지로 다양하게 활용되고 있으며 최근들어 장수명 및 저전력 소비의 장점을 갖춘 LED 광원의 적용이 확산되고 있다. 본 연구는 다중 배광 및 픽셀라이팅 기술 구현을 통해 등부표의 회전 운동에도 수평빔 유지제어가 가능한 신형 LED 등명기를 개발하여 암전 영역 제거 및 등질 인지향상을 통해 해양 사고 방지 및 해양 안전 향상을 목표로 한다. 등부표용 신형 LED 등명기 개발을 위해 다중 렌즈 및 픽셀 라이팅과 같은 광원/광학 기술과 제어 구동 시스템 설계 기술의 적용하였다. 본 연구에서 개발한 신형 LED 등명기는 등부표에 최적화된 수평배광 유지가 가능한 세계 최초의 등명기 시스템으로 국제 표준 제안 등을 통해 향후 세계 시장 진출을 추진하고자 한다.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.11 no.5
• /
• pp.433-440
• /
• 2001

In this paper, we propose an automatic navigation system of ship using multivariable fuzzy control system in dynamic sea environment. The proposed multivariable fuzzy control system consists of two subsystems with three inputs and two outputs. The effectiveness of the proposed multivariable fuzzy control system is shown by simulation results.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.11 no.2 s.23
• /
• pp.83-96
• /
• 2005

As recently, 'International convention for the control and management of ship's ballast water and sediments' was adopted, it is necessary to accept the international convention in Korea The movements of foreign countries for ship's ballast water control and management were investigated, and domestic environment-related laws were reviewed and compared regarding the discharge of industrial wastewater and ship's ballast water. Alternative measures of domestic legislation were suggested for acceptance of the international convention.

• Journal of Institute of Control, Robotics and Systems
• /
• v.8 no.1
• /
• pp.67-73
• /
• 2002

This paper presents the development of development of stabilization and tracking algorithms for a shipboard satellite antenna system. In order to stabilize the satellite antenna system designed in the previous work, a model for each control axis is derived and its parameters are estimated using a genetic algorithm, and the state feedback controller is designed based on the linearized model. Then a tracking algorithm is derived to overcome some drawbacks of the step tracking. The proposed algorithm searches for the best position using gradient-based formulae and signal intensities measured according to a search pattern. The effectiveness of both the stabilization and tracking algorithms is demonstrated through experiment using real-world data.

• Journal of Institute of Control, Robotics and Systems
• /
• v.18 no.1
• /
• pp.13-20
• /
• 2012

This paper proposes a marine engine state monitoring system using a DPQ (Distributed Precedence Queue) mechanism which collects the state of bearings, temperature and pressure of engine through the CAN network. The CAN is developed by Bosch Corp. in the early 1980' for automobile network. The data from various sensors attached in the marine engine are converted to digital by the analog to digital converter and formatted to fit the CAN protocol at the CAN module. All the CAN modules are connected to the SPU (Signal Processing Unit) module for the efficient communication and processing. This design reduces the cost for wiring and improves the data transmission reliability by recognizing the sensor errors and data transmission errors. The DPQ mechanism is newly developed for the performance improvement of the marine engine system, which is demonstrated through the experiments.

• Journal of Institute of Control, Robotics and Systems
• /
• v.19 no.11
• /
• pp.968-973
• /
• 2013

In the transportation industry, especially in the shipbuilding process, 3D surface measurement of large-scale hull pieces is needed for fabrication and assembly. We suggest an efficient method for checking the shape of curved plates under the forming operation with short time by measuring 3D profiles along the multi lines of the target surface. For accurate profile reconstruction, 2D camera calibration and 3D calibration using gauge blocks were performed. The evaluation test shows that the measurement accuracy is within the boundary of tolerance required in the shipbuilding process.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.960-961
• /
• 2015

청정지역으로 규정된 제로에미션 지역을 통과하기 위해서는 배터리를 포함한 전기시스템을 사용하여 외력 특성과 무관하게 안정된 운전성능을 유지해야만 한다. 또한 전기시스템이 항구에서 완충된 상태로 출항이 진행되어서 목표지점에 도착한 경우 뿐만 아니라, 운항 중 발전기 시스템에서 배터리를 충전하고 회항지점에서 항구까지 안정된 전력을 유지해야만 한다. 그러나 운항이 진행되면서 선체에 작용되는 외력을 극복하기 위해 추진력을 급속히 변화하게 된다. 이러한 방법은 제한된 에네지를 사용하는 전기시스템에서 급격한 속도 변화는 에너지 사용량을 증가시키고, 진동, 발진등 추진체에 수명을 단축시키는 단점을 가지고 있다. 본 논문에서는 전기시스템의 전력 변화량을 기반으로 제로에미션을 운항하는 운전방법을 제안한다. 제안된 속도제어방법은 모드별로 선정된 속도변화량을 기준으로 모터의 토크응답성과 전력 변화특성을 PSIM을 사용하여 모의시험하였고, 구동부 하드웨어를 구현하여 성능을 부하 모의시험장치에서 검증하였다.

• Journal of Advanced Marine Engineering and Technology
• /
• v.22 no.6
• /
• pp.894-900
• /
• 1998

In this paper, a communication method is proposed for the development of a main engine remote control system. The main engine control system compriese three subsystems such as RCS (Remote Control System) BCS (Bridge Control System) and SS (Safety System), Thus it is required to exchange data each other among these subsystems. The communication method has simplified hardware through the minimization of communication components where the interrupt method are employed for receiving and the polling method for transmitting. We discuss a methodology of using a ring buffer for data storage physically which has two buffers virtually for the effective use of memory. This communication method presents a good performance in the system which has rather small numbers of communication data.

• Proceedings of the Korean Society of Marine Engineers Conference
• /
• 2005.06a
• /
• pp.268-273
• /
• 2005

The conventional PID controller has been widely used in many industrial control system because engineers can easily understand how to deal with three parameters of PID controller. The conventional tuning methods, however, have a tendency depend on experience and experiment. In this paper a real-coded genetic algorithm is used to search for the optimal parameters of PID controller for marine diesel engine. Simulation results compared with conventional PID controller tuning methods show the effectiveness and good performance of proposed scheme.