• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2010년도 춘계학술대회 논문집
• /
• pp.827-828
• /
• 2010

• 전기학회논문지
• /
• 제63권1호
• /
• pp.70-75
• /
• 2014

TMR(triple modular redundant) digital excitation system with simulator is developed for tuning optimal control parameters during commissioning test and coping with system faults rapidly. A new system which mocks up virtual generator, turbine, grid can simulate as if excitation system is connected to a real generator system by setting four switches. The maintenance crew using the simulator is able to test perfectly the phase controller rectifiers, field breaker, sequence relays as well as TMR controller of the excitation system. Commissioning and performance results about the excitation system with simulator is discussed. The trial product was installed and operated at a 500MW thermal power plant after the commissioning test.

• 산업공학
• /
• 제25권4호
• /
• pp.382-392
• /
• 2012

Reactor protection system to keep nuclear safety and operational economy of plants requires high reliability. Such a high reliability of the system can be achieved through the redundant design of components. However, common cause failures of components reduce the benefits of redundant design. Thus, the common cause failure analysis, to accurately calculate the reliability of the reactor protection system, is carried out using alpha-factor model. Analysis results to 24 operating months are that 1) the system reliability satisfies the reliability goal of EPRI-URD and 2) the common cause failure contributes 90% of the system unreliability. The uncertainty analysis using alpha factor parameters of 0.05 and 0.95 quantile values shows significantly large difference in the system unreliability.

• 제어로봇시스템학회논문지
• /
• 제17권11호
• /
• pp.1067-1073
• /
• 2011

In this paper, the methodology of a CA (Control Allocation) based FTNCS (Fault-Tolerant Networked Control System) is proposed. Control allocation is a control surface management technique by redistributing the redundant control surfaces in overactuated systems. In modern high performance aircrafts, they adopt many redundant control surfaces to provide high performance and to satisfy various tactical requirements. Moreover, redundant control surfaces provide an opportunity to compensate performance degradation due to failures in more than one actuator by re-allocating redundant control surfaces. Simulation results with an F-18 HARV demonstrate that the proposed CA based FTNCS can achieve a fast and accurate tracking performance even in the presence of actuator faults.

• International Journal of Reliability and Applications
• /
• 제8권1호
• /
• pp.83-94
• /
• 2007

In this paper, we consider a standby redundant structure with a function of switchover processing which may not be not perfect. The switchover processing is governed by a control module whose failure may cause the failure of the whole system. The parameters measuring such an effect of failure of the control module is included in our reliability model. We compute several reliability measures such as reliability function, failure rate, MTBF, mean residual life function, and the steady state availability. We also compare a single unit structure and the redundant structure with regard to those reliability measures. An example is given to illustrate our results.

• 대한산업공학회지
• /
• 제21권2호
• /
• pp.183-194
• /
• 1995

This research paper describes several possible suggestions which are essential to develop for Built-In-Test(BIT) related systems, such as more precise BIT parameter analysis, sensitivity analysis of the impact of BIT on redundant systems, statistical inference of field data for BIT performance parameters, methods of reducing BIT false alarms, BIT application in industrial automation and remote control, prevent the system from the impact of BIT failure, undetections and false alarms, life cycle cost analysis for BIT. And, it is mainly focused on redundancy technique for solving BIT diagnostic problems. Algorithms for redundant systems : overlapping technique, flexible redundant BITs are presented and case study will be shown based on various experiment.

• 한국위성정보통신학회논문지
• /
• 제9권2호
• /
• pp.58-62
• /
• 2014

본 논문에서는 링크의 지속적인 안정성을 위해 중심국 모듈을 이중화로 구성하고 이중화로 구성된 모듈을 제어하는 위성 통신 시스템에 대해 소개하고자 한다. 위성 통신 시스템의 중심국 구성 모듈을 이중화함으로써 불안정한 링크나 중심국의 구성 모듈의 오류 등으로 인한 서비스 중단을 최소화할 수 있다. 이를 통해 차세대 VSAT 서비스 및 방송 서비스에의 효율적인 활용 기술을 확보할 수 있을 것으로 예상해 본다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2003년도 ICCAS
• /
• pp.687-690
• /
• 2003

This paper presents the development of Programmable Logic Controller (PLC) and network to design the redundant control system in order to control the high priority process. The industrial process that cannot be shutdown or the effect of the shutting down takes abundantly damage. In this article, we say that the high priority process. The redundant systems are designed for controlling the high priority process that the control system must have many controllers to instead the main controller when it has some error. This paper we designed the redundancy control system by the advantage of the high-speed communication on the PLC’s network. The temperature control system and the traffic light control system used as the case study. Each example processes consist of two sets of controller. Our scheme we can increase the reliability prevents process down time and reduces the cost of opportunity to loss also.

• 한국항공우주학회지
• /
• 제32권10호
• /
• pp.60-66
• /
• 2004

위성의 자세제어 시스템의 신뢰도를 높이기 위하여 여유 추력기를 장착하는데, 이를 활용하기 위해서 효율적인 관리 방안이 요구된다. 본 논문에서는 조종력 할당 기법을 위성의 여유 추력기 관리 방안으로 제안한다. 조종력 할당 기법은 최척화 기법을 이용해서 원하는 모멘트 입력을 구현하는 여유 조종력을 결정하는 방법이다. 여기에서는 여유 추력기에 대한 할당 문제는 선형 프로그래밍 문제로 표현할 수 있음을 보인다. 또한 수치예제를 통해서 제안한 방법이 기존의 방법에 비해 효율적임을 보인다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
• /
• pp.258-263
• /
• 1991

Optimal configurations for redundant TDOF (Two Degree Of Freedom) sensor systems are proposed. The determinant of error covariance matrix is used as the performance index, and optimal configurations for 2 TDOF sensor system and 3 TDOF sensor system are evaluated by minimizing the index.