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Reliability Path와 Cut을 이용한 시스템의 신뢰도 계산방법에 관한 기초연구
이장일(Jangil Lee),박기준(Keejun Park),천환규(Hwankyu Chun),정충민(Choongmin Jeong),서명원(Myungwon Suh) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, System including aircraft, train, and ship is more complex and huger. Accordingly, Reliability calculation of these systems is more difficult. This paper is the study about reliability calculation algorithm using reliability path and cut of complex system that is difficult to analyze solution. If system has simple series structure or parallel structure in reliability block diagram, we can easily find analytical solution. But when system has very complex structure, we are very difficult to find analytical solution of the system. In this case, we can assess system reliability using failure enumeration method of reliability path and cut. This research represent reliability block diagram by adjacent matrix and define reliability path and cut. We can find any system status by failure enumeration of reliability path and cut. As a result, we can calculate any kinds of system reliability through this process. This result can be applied to RCM(Reliability Centered Maintenance) and web-based Reliability Information Management System that requires system reliability being composed by reliability of individual part.
유전자 알고리즘을 이용한 도시철도차량의 예방정비주기 최적화에 관한 연구
정충민(Choongmin Jeong),박기준(Keejun Park),이장일(Jangil Lee),신동준(Dongjun Shin),송아영(Ah-young Song),백우경(Wookyung Baik),서명원(Myungwon Suh) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, system including aircraft, train, and ship is more complex and huger. These systems are used to public transport to a lot of people. Accordingly, safety becomes to more important problem. But excessive maintenance cause a lot of maintenance cost. So we need maintenance cost reduce by efficiency operating. In this research, we found the optimum maintenance cycle using genetic algorithm. This result can be applied to RCM(Reliability Centered Maintenance) and web-based Reliability Information Management System that requires optimum maintenance cycle and cost.
알루미늄 압출재와 샌드위치 복합재 루프를 적용한 초고속 자기부상 열차의 차체 경량화 설계 연구
강승구(SeungGu Kang),신광복(KwangBok Shin),박기준(KeeJun Park),이은규(EunKyu Lee),윤일노(IllRo Yoon) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.10
본 논문의 목적은 알루미늄 압출재와 샌드위치 복합재를 사용한 초고속 자기부상 열차의 하이브리드 차체 경량화 설계를 제안하는 것이다. 샌드위치 복합재는 무게 감소를 위해 2차 부재인 루프에 적용되었다. 용접에 의한 샌드위치 복합재 루프와 알루미늄 압출재 사이드 프레임과 접합시키기 위해 샌드위치 복합재 네 옆면에 가이드 알루미늄 프레임을 갖도록 고안하였다. 가이드 알루미늄 프레임의 체결력은 3점 굽힘 시험을 통해 검증하였으며, 차체의 구조 안전성 및 충돌 안전도는 상용 유한요소해석 프로그램을 이용하여 철도안전법에 따라 평가하고 검증하였다. 연구결과, 알루미늄 압출재와 샌드위치 복합재로 이루어진 하이브리드 차체는 알루미늄 압출재로만 이루어진 차체에 비해 무게 절감 효과와 향상된 구조 성능을 얻을 수 있다. The purpose of this paper is to suggest a weight-reduction design method for the hybrid carbody of a high-speed maglev train that uses aluminum extrusion profiles and sandwich composites. A sandwich composite was used on the roof as a secondary member to minimize the weight. In order to assemble the sandwich composite roof and aluminum extrusion side frame of the carbody using welding, a guide aluminum frame located at the four sides of the sandwich composite roof was introduced in this study. The clamping force of this guide aluminum frame was verified by three-point bending test. The structural integrity and crashworthiness of the hybrid carbody of a high-speed maglev train were evaluated and verified according to the Korean Railway Safety Law using a commercial finite element analysis program. The results showed that the hybrid carbody composed of aluminum extrusion frames and a sandwich composite roof was lighter in weight than a carbody made only of aluminum extrusion profiles and had better structural performance.
iRams를 이용한 도시철도 전동차의 신뢰성 분석에 관한 연구
김세훈(Sehoon Kim),배철호(Chulho Bae),김현준(Hyunjun Kim),구태윤(Taeyun Koo),박기준(Keejun Park),이호용(Hoyong Lee),서명원(Myungwon Suh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Urban transit has grown to the principal public transportation during the past decades. In case that unexpected failures/accidents occur in urban transit, it can lead to confusion socially. Moreover, as urban transit is a complex system combined electrically and mechanically, it is necessary to perform more systematic maintenance to minimize occurrence of failures/accidents by reliability analysis. To analyze reliability of Urban Transit, this study applies iRams. After constructing bill of material and function/reliability block diagram of urban transit and its subsystem, on the basis of them, we estimate reliability of each subsystem. Finally, through result comparing estimated reliability with target reliability determined by ARINC, this study presents utility of reliability-based maintenance methodology.
3자유도 현가장치의 강인관측기 성능 평가를 위한 HIL 시스템
강종모(Jongmo Kang),김형래(Hyeongrae Kim),김영진(Youngjin Kim),김주연(Juyeon Kim),최유창(Yuchang Choi),임성진(Seongjin Yim),박기준(Keejun Park),오동호(Dongho Oh) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
A vertical 3-DOF model was constructed using MATLAB/Simulink to form a MILS(Model-In-the-Loop Simulation), and a robust observer was designed to verify its performance in simulation in our previous paper(1). To verify the performance of the designed robust observer in a real environment, this study configured HILS(Hardware-In-the-Loop Simulation) and conducted experiments. As For verifying the performance of the robust observer by attaching accelerometer and displacement sensors to the actual suspension device, but this is costly and requires vehicles for suspension device. Therefore, we designed a device that can measure actual vibration signals and change the physical properties of the model within the space constraints of the laboratory environment. To construct the HIL system, a vertical 3-DOF model was built. The vibration signal was measured by accelerometer and a laser displacement sensor, and the measured value was used for robust observer to estimate the value that was not directly measured.