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해양플랜트 장비 성능 모니터링 시스템을 위한 데이터베이스 설계
유승열,서주완,이재철,황세윤,황호진,이순섭,Yoo, Seung-Yeol,Seo, Ju-Wan,Lee, Jae-Chul,Hwang, Se-Yun,Hwang, Ho-Jin,Lee, Soon-Sup 해양환경안전학회 2020 海洋環境安全學會誌 Vol.26 No.5
안전한 해양플랜트 운용을 위해 장비 성능평가를 실시하고 그 결과를 모니터링 할 수 있는 시스템이 필요하다. 현재는 육상으로부터 멀리 떨어진 해양플랜트의 특성상 장비 성능평가를 위해 정기적으로 계측 데이터를 저장매체에 저장한 후 육상으로 운반해야한다. 이로인해 성능평가 주기가 길어지고, 다음 성능평가가 시행되기 전까지의 장비의 성능 저하 정도를 알 수 없어 장비의 고장을 방지하기 어렵다. 따라서 육상이 아닌 해양플랜트 내에 온보드(on-board) 형태의 장비 성능 모니터링 시스템을 구축할 필요가 있다. 본 논문에서는 해양플랜트 내에서 장비 성능을 평가하고 그 결과를 가시화하는 장비 성능 모니터링 시스템을 개발하기 위한 초기 단계로, 장비 성능 모니터링 시스템의 데이터베이스를 설계 및 구축하고자 한다. 이를 위해 주요 장비의 태그 데이터를 선정하여 분석을 진행하였다. 최종적으로 장비 상태를 실시간으로 계측한 데이터를 해양플랜트 내에서 저장 및 관리하기 위해 온보드 형태의 장비 성능 모니터링 시스템을 위한 데이터베이스를 설계 및 구축 하였다. To ensure the safe operation of offshore plants, a system is needed for evaluating the equipment performance and for monitoring the results. Currently, owing to the operating environments of of shore plants situated far from the land, measurement data must be periodically stored in storage devices and carried on the land for evaluating the equipment performance. Consequently, it is difficult to prevent equipment failure because the performance evaluation cycle is long. Furthermore, until the next performance evaluation is conducted, it is difficult to determine the equipment's degree of performance degradation. Hence, it is necessary to install an onboard equipment performance monitoring system within the offshore plant. In this study, to evaluate and visualize the results of equipment performance within an offshore plant, a database was designed as the initial step towards the development of an equipment performance monitoring system. The tag data of major equipment were selected and analyzed. Furthermore, in order to store and manage the data measured in real time within the offshore plant, a database was developed for the onboard equipment performance monitoring system.
RBM 방법론을 이용한 BOG 회수 시스템 의사결정 지원 시스템 개발
유승열(Seung-Yeol Yoo),송덕용(Duckyong Song),강동훈(Donghoon Kang),이재철(Jae-Chul Lee),이순섭(Soon-Sup Lee) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.4
Failure of a BOG re-liquefaction system of a floating LNG power plant can cause accidents such as fire or explosion. To prevent the failure of the BOG re-liquefaction system, operators have to maintain the system in correct maintenance methods. However, it is not easy to decide appropriate maintenance methods. Operators need to find the methods to minimize the amount of damage caused by the failure while considering of economic feasibility. To this end, systematic things must be in place to help the operators make appropriate decisions. In this paper, we developed a decision making assistance system for the BOG re-liquefaction system using risk based maintenance methodology. The developed system estimated risk of equipment in consideration of failure rate and severity of the equipment failure. Afterwards, the developed system found maintenance methods that can minimize damage caused by the equipment failure. Finally, after economic evaluation, the developed system proposed the maintenance methods to operators.
유승열(Seung-Yeol Yoo),장준교(Jun-gyo Jang),이재철(Jae-Chul Lee),김영훈(Young-Hun Kim),민천홍(Cheon-hong Min),이순섭(Soon-Sup Lee) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.3
In shipyard, transporters are essential transportation equipment. However, during transporting blocks by transporters, the blocks overturning accident can incur by changed the center of gravity of them. Current transporters are tried to transport the blocks in safety on the basis of operator experience and judgment. Unfortunately the methods are ineffective to prevent the blocks overturning accidents. In fact, these accidents are happening continuously. Therefore, it is necessary to take measures to prevent the accidents in advance by informing operators of the blocks transportation state of the transporters. In this paper, to prevent the blocks overturning accidents, a monitoring system for blocks transportation state of transporter was developed. The requirements of field workers were analyzed and the development system was designed. In addition, performance evaluations were conducted on development systems to complete performance verification.
유승열(Seung-Yeol Yoo),이재철(Jae-Chul Lee),설예인(Ye-In Seol),이순섭(Soon-Sup Lee) (사)한국CDE학회 2018 한국CDE학회 논문집 Vol.23 No.2
It is important to measure and analyze offshore platform motion data for the safety of offshore platforms that are installed in an extreme environmental conditions. Especially, in the Gulf of Mexico, because of the hurricane and loop current that has been strengthened due to changes in the ocean environment, a monitoring system is necessary to measure the offshore platform motion data in real time, as well as simultaneously analyze it for safe operation and accident prevention. In order to develop such a monitoring system, it is extremely critical to obtain accurate data. However, since data measured in real time is not suitable for analysis due to quality problems, the data must be processed. The problem is that the processed data differs depending on the processing methods being employed, and results in entirely different analysis results. Incorrect results can mislead the current state of the offshore platform causing missed maintenance periods or, in the worst case, major accidents. Therefore, verifying both the adequacy of the methods used to process the data and the accuracy of the results is most vital. In this paper, improving reliability of the monitoring system that can measure offshore platform motion data and analyze data in real time, the validity of the method used in measurement data processing and the accuracy of the processed data were verified.
유승열(Seong Yeol Yoo),김우연(Woo yeon Kim),김승종(Seung Jong Kim),이욱륜(Wook Ryun Lee),배용채(Yong Chae Bae),노명규(Myounggyu Noh) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.4
본 논문에서는 환형 영구자석을 이용한 스러스트 베어링의 최적설계에 대하여 기술하였다. 영구자석형 스러스트 베어링은 두 조의 환형 영구자석으로 이루어지며, 한 조의 영구자석이 다른 한 조의 영구자석 내부에 위치한다. 영구자석간의 축방향 변위 (엇갈림)에 의해 축방향 힘이 발생하고 이를 통해 스러스트 베어링 역할을 하게 된다. 최소한의 영구자석으로 베어링 부하용량을 만족하는 베어링 설계 파라미터를 구하기 위해 본 논문에서는 등가전류판 방법을 이용하여 해석적 설계식을 유도하고, 적절한 제한 조건을 설정하여 최적 설계를 수행하였다. 최적 설계 결과는 3 차원 유한요소해석을 통해 검증하였다. 본 논문에서 고려한 축방향 배열과 Halbach 배열의 스러스트 베어링 중 Halbach 배열이 축방향 배열에 비해 동일한 부피의 영구자석으로 더 큰 부하용량을 얻을 수 있음을 확인하였다. 등가전류판 방법의 유효성을 3 차원 유한요소해석을 통해 검증하였고, 축 방향 배열보다Halbach 배열이 등가전류판 방법의 가정에 좀 더 민감하게 영향을 받는 것을 알 수 있었다. In this paper, we describe a process for optimally designing a ring-type permanent magnet thrust bearing. The bearing consists of two sets of permanent magnet rings. One set is located inside the other set. An axial offset between the two sets creates axial force, which results in a thrust bearing function. In order to realize an optimal design of the bearing where the required load capacity of the bearing is achieved with the least magnet volume, we derived analytical design equations by adopting the equivalent current sheet (ECS) method. We considered the following two types of magnet arrays: axial arrays and Halbach arrays. These two types of arrays are optimized using the analytical design equations. The results of the optimization are verified using three dimensional (3D) finite element analyses (FEA). The results show that the Halbach array can achieve the required load capacity with less amount of permanent magnet than the axial array does. The efficacy of the ECS method is also verified by using 3D FEA. It is found that the accuracy of ECS method is more sensitive to the underlying assumptions for the Halbach array than for the axial array.