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This paper describes simulation results of WEC(Wave Energy Converter), and the associate results are application to the commercially available WEC for buoy. Maximum performance is derived from resonance condition. This type of resonance occurs when one of the parameters in an oscillator varies periodically. The water column in WEC oscillates under the effect of gravity and the compression of an air chamber. The WEC characteristics is defined with assuming independence of the buoy heaving motion and the motion of the water column within the center cylinder.
Generally, cooling system for electric propulsion system of under water vehicles is consisted of fresh water system and sea water system. A primary cooling is used for cooling in motor and inverter with fresh water, and the fresh water is cooled by a secondary cooling system with sea water. Secondary cooling system is to use seawater fur cooling fresh water and fresh water is used to cool the heat load of entire under water vehicle. Cooling fresh water which is controlled by valve consequently fur adjusting fresh water temperature. This paper suggests the method f3r saving energy by controlling the pump RPM using PID controller to change sea water flow rate according to fresh water temperature. This paper confirmed the stability of control system through simulations.
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
Generally, cooling system for electric propulsion system of under water vehicles is consisted of fresh water system and sea water system. A primary cooling is used for cooling in motor and inverter with fresh water, and the fresh water is cooled by a secondary cooling system with sea water. Secondary cooling system is to use seawater for cooling fresh water and fresh water is used to cool the heat load of entire under water vehicle. Cooling fresh water which is controlled by valve consequently for adjusting fresh water temperature. This paper suggests the method for saving energy by controlling the pump RPM using PID controller to change sea water flow rate according to fresh water temperature. This paper confirmed the stability of control system through simulations.
Fuel represents a significant portion of the operating costs of voyages of the vessel. Under this situation, dramatic increase in fuel price caused a problem that earnings of ship becomes decreased seriously. Pumps in a cooling system of the vessel are often operated inefficiently. The reasons will vary from process to process and application to application. Inefficiency of pumps is one of the reason for making the cost of operating the vessel increased. This paper suggests energy-effective cooling system that controls sea water pumps with inverters to reduce energy consumption in vessel by conducting simulation with LabVIEW. Results shows that electric energy consumption of pumps are significantly deceased. If this energy-effective cooling system is applied to other systems which need cooling, it could be useful in reducing electric energy wastage.
The fuel charge is getting higher in navigation cost. Therefore, shipowner tries to find method for reducing oil consumption. ESS(Energy Saving System) is one of the method. ESS is the system consisted with two inverters, ESS control unit and monitoring system. Two inverters control two main sea water cooling pumps. In the ESS control Unit, control algorithm finds optimized point to decrease a power consumption of main sea water cooling pumps. Monitoring system observes ESS not to work improperly. ESS is experimented in the laboratory with real condition and analyzed in every view. After experiment, the result of the experiment shows that the control algorithm works correctly and safely.
Recently, the research and development of the fish cage in open sea from domestic is active and it is almost complement with commercial scale test on 'seogwipo'. But domestic technology is not sufficient of management monitoring system with advanced country, so it is difficult that maintenance and monitor of fish cage in open sea. In this paper, we show the building method of remote vision system and propose suitable method of vision system on the sea in actual field test.
Ammoniac nitrogen excretion is not able to be removed in ocean fish farm, It is the min reason for fish being dead in large quantities or declining feeding activity that ammoniac nitrogen is not removed efficiently in ocean fish farm. Because of declining with feeding activity, it is true that feed is wasted for the present. To solve this problem, NH₃?, dissolved oxygen, temperature, ph which are environment factors in ocean fish farm, monitoring system is suggested to be farmed in this paper.
레거시 소프트웨어를 재사용하기 위해서는 소스코드의 구조와 행위, 연관관계를 파악하는 것이 중요하다. 소스코드 분석을 통해 레거시 소프트웨어의 구조를 얻어내고 이에 대한 수정을 통해 소스코드에 반영하고자 하는 연구가 활발히 진행되고 있다. 그러나 기존의 역공학 도구들은 레거시 소프트웨어를 객체지향 다이어그램으로 정확히 추출해내지 못하였고 또한 호환성이 떨어지는 문제점을 가지고 있다. 본 연구에서는 기존의 역공학 툴들의 문제점을 보안하고 호환성을 높이며 재사용성을 향상시키기 위한 방법을 제시한다. 자바 소스코드로부터 UML클래스 다이어그램을 추출하기 위해 본 논문에서는 자바 소스코드의 파싱을 통해 클래스 다이어그램 생성에 필요한 AST를 추출하여 XML로 저장함으로써 상호운영성을 높이며 클래스간의 연관관계를 상세히 표현하기 위한 방법을 제시한다.
특수선 분야는 SWATH, SES, 여객선 등의 민수분야 특수선과 구축함, 잠수함, HOVERCRAFT 등의 군수분야 특수선으로 나눌 수 있다. 이러한 특수선 분야는 차세대 조선분야 핵심 사업으로 미국, 독일, 노르웨이 등의 선직국이 주도하는 차세대 핵심 조선 사업 분야이다. 본 연구에서는 특수선박의 구성 체계를 연구조사하고, 이를 통하여 체계적인 개발계획 및 연구방향을 수립하고, 더불어 연구가능분야를 제시하고자 한다.
This paper is analyzed the characteristic of multi-phase inverter for the electric propulsion system. It is designed with BLDC motors Y connection type with three phases and electric independence type 3 phases motors, shows simulates of it, compares with the characteristic. From the simulation result, independence shape 3 phases motor causes comparing Y connection motor's each phase voltage to increase it's voltage. The characteristic of reducing amperage will be displayed. With the reduce of each phase current, the current pluse be reduced, torque pulsation has been reduced. So the independence type inverter is suitable propulsion BLDC motor.