• 전기학회논문지
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• 제66권4호
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• pp.701-708
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• 2017

This paper proposes an optimum design method using Teaching-Learning-based optimization for the fuzzy PID controller of Magnetic levitation rail-guided vehicle. Since an attraction-type levitation system is intrinsically unstable, it is difficult to completely satisfy the desired performance through the conventional control methods. In the paper, a fuzzy PID controller with fixed parameters is applied and then the optimum parameters of fuzzy PID controller are selected by Teaching-Learning optimization. For the fitness function of Teaching-Learning optimization, the performance index of PID controller is used. To verify the performances of the proposed method, we use a Maglev model and compare the proposed method with the performance of PID controller. The simulation results show that the proposed method is more effective than conventional PID controller.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1817-1823
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• 2007

In this study, we have studied rail infrastructure related to emergency action to manage the risk when emergency caused by faults of facility or rail vehicle during operation happens. Especially we have compared the effect of emergency action with examining the structure of vehicle, tunnel, bridge and access road, etc which are related to emergency action. Also, we have tried to analyze effects of radio and communication equipment, lifesaving and refuge which could be used for rolling stock, station, control room, tunnel, bridge and etc, and we have presented the way of reporting the emergency to the train driver or crew, control room, outside networks which could be used by passengers in vehicle, station, railroad line. Based on these, we have analyzed the conduct of emergency action in length of time when emergency happens in railway and high-speed railway, and studied the method of which passengers could be guided safely and escape from the scene of the accident.

• 시스템엔지니어링학술지
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• 제9권1호
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• pp.1-11
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• 2013

In this study, unattended Light Rail Transit System (K-AGT) is a general-purpose standards safety requirements of IEC 62267 based System Engineering Process (SEP) was used. Functional analysis and physical architecting for each requirements through the vehicle was classified into sub-systems, design was analyzed in terms of SE. The analysis of the proposed system engineering process, unattended train operation (UTO), driverless train operation(DTO) design of the safety measures to be used as the basis is studied.

• Journal of Biosystems Engineering
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• 제31권6호
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• pp.489-499
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• 2006

Since the application of chemicals in confined spaces under the canopy of an orchard is hazardous work, it is needed to develop an autonomous guidance system for an orchard sprayer. The autonomous guidance system developed in this research could steer the vehicle by tracking an overhead guidance rail, which was installed on an existing frame structure. The autonomous guidance system consisted of an 80196 kc microprocessor, an inclinometer, two interface circuits of actuators for steering and ground speed control, and a fuzzy control algorithm. In addition, overhead guidance rails for both straight and curved paths were devised, and a trolley was designed to move smoothly along the overhead guidance rails. Evaluation tests showed that the experimental vehicle could travel along the desired path at a ground speed of 30 $\sim$ 50 cm/s with a RMS error of 5 cm and maximum deviation of less than 12 cm. Even when the vehicle started with an initial offset or a deflected heading angle, it could move quickly to track the desired path after traveling 2 $\sim$ 3 m. The vehicle could also complete turns with a curvature of 1 m. However, at a ground speed of 50 cm/s, the vehicle tended to over-steer, resulting in a zigzag motion along the straight path, and tended to turn outward from the projected line of the guidance rail.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1501-1514
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• 2008

Recently, so as to solve the urban transportation problem the LRT(Light Rail Transit) system has been studied on the essential technology and the engineering know-how, which lead lower construction cost and higher reliability. The localization development of rubber tired AGT(Automatic Guided Trainsit) system has performed from 1999 to 2004, as a national project of the Minister of Land, Transport and Maritime Affairs. For the application of the rubber tired AGT system in Busan Subway 3-2 Line, this study is focused on the reliability of aluminium profiles vehicle carbody and the establishment of the test and evaluation technologies. In this paper, 3D modeling simulation was applied to the load test of aluminium vehicle carbody. The reliability of the vehicle carbody was estimated as the fatigue test of welded aluminium profiles. From the test and simulation results, it could be concluded that the developed rubber tired AGT shows a good structural reliability and integrity.

• 전기학회논문지
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• 제60권1호
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• pp.85-92
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• 2011

Main characteristic in railroad is the guided movement of the wheel by the track through a metal-to-metal contact, conferring to the rail vehicle a single degree of freedom. There are defects such as head check, shelling, corrugation, squats etc in surface of the rail by interface between the wheel and rail. These defects bring about reducing the life-cycle of rails and track components and increasing noises. In case of bad conditions, it is possible to happen to full-scale accident such as derailment. Recently, the track capacity has been increased for increasing speed and operation efficiency. So, maintenance and indirect cost have been increased. Currently, a coating method of rail construction is proposed by using the ceramics in Korea. Rails are used as the earth in electrical railroad systems. Currently traction return current is flowed through wheels of trains. In case of rails coated, problems are caused in the contact power between wheel and coating material of spray. In this paper, electric model is presented in the AT feeding method. In case of rails coated, electric model is presented. Also, standard resistance of the ceramic is demonstrated by contact power between wheel and coating material of spray.

• 한국지능시스템학회논문지
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• 제24권3호
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• pp.279-284
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• 2014

본 논문에서는 최적화 기법과 퍼지 PID제어기를 이용한 자기부상시스템의 부상제어기를 제안한다. 흡인식 자기부상시스템은 일반적으로 비선형 특성을 포함하는 불안정한 시스템이기 때문에 일반적인 선형 제어기를 적용할 경우 우수한 성능을 얻기에는 어려운 점이 있다. 본 논문에서 제안된 제어기는 고정파라미터를 갖는 퍼지 PID제어기를 이용하였으며, 퍼지 PID 제어기 파라미터들은 유전자 알고리즘을 이용하여 최적화를 수행하였으며 유전알고리즘의 목적함수로는 일반적으로 사용되는 성능지수 함수를 사용하였다. 제안된 퍼지 PID 제어기를 적용한 자기부상시스템의 성능을 평가하기 위하여 Matlab을 이용하여 시뮬레이션을 수행하였으며, 고전적 PID제어기와 성능을 비교 분석하였다. 제안된 제어기를 적용한 자기부상시스템의 성능이 고전 PID제어기에 비하여 더 우수한 성능을 보임을 시뮬레이션을 통하여 검증하였다.

• 한국지능시스템학회논문지
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• 제22권2호
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• pp.239-245
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• 2012

본 논문에서는 시간영역 및 주파수영역 성능지수와 클론 선택기반 유전자 알고리즘을 이용한 자기부상 RGV(Rail-Guided Vehicle)의 최적 PID 제어기 설계 기법을 제안한다. 일반적으로 RGV에 적용되는 흡인식 자기부상시스템은 시스템 자체의 불안정성을 내포하고 있으며, 오버슈트 및 정착시간을 고려한 설계가 요구되기 때문에 기존의 성능지수함수로는 원하는 성능을 얻기에 어려움이 있다. 본 논문에서는 먼저 PID 제어기 설계에 사용되는 성능지수함수를 분석하고, 자기부상 RGV에 적합한 시간영역 및 주파수영역 성능을 고려한 새로운 성능지수 함수를 제안하였다. 또한, 클론선택 최적화기법을 적용하여 성능이 향상된 클론 선택기반 유전자 알고리즘을 제안하였다. 제안된 최적화 알고리즘과 성능지수함수의 성능을 평가하기 위하여 단순 유전자 알고리즘과 기존의 군집 최적화 기법인 PSO(Particle Swarm Optimization)를 이용하여 비교 시뮬레이션을 하였다. 제안된 알고리즘이 기존의 최적화 기법들에 비해 자기부상 RGV의 최적 제어기 설계에 더 효과적임을 시뮬레이션을 통해 보였다.

• 산업공학
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• 제15권4호
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• pp.364-373
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• 2002

This paper developed an operating software for the manufacturing cell of a model plant. The model plant, which was manufactured by Fishertechnik, consists of an assembly cell, a machining cell, and supplementary material handling equipments. Each I/O module of the model plant communicates with the INTERBUS controller devices via High-level Language Interface(HLI). The machining center has two machining cells, which consists of 4 machines respectively, two 3-axis portal transporters, and a rail guided vehicle(RGV). The Petri-Net was used to investigate the dynamics of each machining cell, e.g., the relation of material handling equipments and machines. The operating software was analyzed and designed by Object Oriented Technique. The software was implemented using Delphi 3.0 under Windows 95/NT operating system.

• 전기학회논문지P
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• 제57권3호
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• pp.215-224
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• 2008

In this paper, we introduced a linear motor-based transfer system with an active pid controller which can be replaced with an automated guided vehicle (AGV) for the port automation. This system, which is named LMCTS(liner motor-based container transfer system), is based on PMLSM (permanent magnetic linear synchronous motor) which basically consists of stator modules on the rail and shuttle car. Therefore more progressive and adaptive control mechanisms should be required to control a system with large variation of container weight, the difference of each characteristic of stator modules, a stator module's trouble etc. We introduced an active control mechanism with an online tuning scheme using modified evolutionary strategy. Some computer simulations are implemented to assess the robustness of the proposed system.