• 제목/요약/키워드: Mechanical system

검색결과 19,894건 처리시간 0.048초

Design, Modeling and Analysis of a PEM Fuel Cell Excavator with Supercapacitor/Battery Hybrid Power Source

  • Dang, Tri Dung;Do, Tri Cuong;Truong, Hoai Vu Anh;Ho, Cong Minh;Dao, Hoang Vu;Xiao, Yu Ying;Jeong, EunJin;Ahn, Kyoung Kwan
    • 드라이브 ㆍ 컨트롤
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    • 제16권1호
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    • pp.45-53
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    • 2019
  • The objective of this study was to design and model the PEM fuel cell excavator with supercapacitor/battery hybrid power source to increase efficiency as well as eliminate greenhouse gas emission. With this configuration, the system can get rid of the internal combustion engine, which has a low efficiency and high emission. For the analysis and simulation, the governing equations of the PEM system, the supercapacitor and battery were derived. These simulations were performed in MATLAB/Simulink environment. The hydraulic modeling of the excavator was also presented, and its model implemented in AMESim and studied. The whole system model was built in a co-simulation environment, which is a combination of MATLAB/Simulink and AMESim software. The simulation results were presented to show the performance of the system.

전동차 제동기의 유압화에 관한 연구 (A Study on Application of Hydraulic Brake System)

  • 이한민;김길동;오세찬;박성환
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.169-171
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    • 2008
  • The brake systems of the rolling stocks are generally consisted of electrical and mechanical brake systems. Because of its inherent structure of the each brake system, the electrical brake system is mainly used at the high speed range while the mechanical brake system is used at the relatively lower speed range. It is desirable for the rolling stocks to apply the entire electrical brake system. However, since the brake force from electric brake system is not enough to stop the rolling stock within the legal stop distance. Therefore, the mechanical brake system is indispensable to rolling stocks. In general, the vast majority of the world trains are equipped with mechanical braking systems which use compressed air as the force to push block on to wheels or pads on to discs. These mechanical systems are known as air brake or pneumatic brakes. For the air brake system, basically huge scale air compressor is equipped and the long pipe line is complexively connected. Since mass of these air brake components, it is difficult to be a light weight equipment and the long pipe line raise the maintenance problem. In order to overcome these problems of air brake system, the hydraulic brake system is proposed in this research. The hydraulic brake system makes the whole weight of brake equipment be light and large braking force can be applied. Therefore, in this research, the validity and advantages of applying the hydraulic brake system are reviewed.

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다중재료 DLP 3차원 프린터의 개발 (Development of Multi-Material DLP 3D Printer)

  • 박세원;정민우;손용운;강태영;이치범
    • 한국생산제조학회지
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    • 제26권1호
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    • pp.100-107
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    • 2017
  • 3D printing is a technology that converts a computer-generated 3D model into a real object with additive manufacturing technology. A majority of 3D printing technologies uses one material, and this is considered a limitation. In this study, we developed a multi-material 3D printer by adopting dual resin vat and cleaning system with DLP (Digital Light Processing) 3D printing technology. The developed multi-material DLP 3D printer is composed of a manufacturing system, cleaning system, transporting system, and automatic resin recharging system. Various 3D structures were 3D printed with two materials, thus demonstrating the potential. Printing performance of the multi-material DLP 3D printer was studied by performing a comparative surface roughness test and tension test on specimens composed of one material as well as those composed of two materials.

철도차량 제동기의 압력제어에 관한 연구 (A Study on Pressure Control Method of Train Brake System)

  • 이한민;김길동;박성환
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 춘계학술대회 논문집
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    • pp.1909-1915
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    • 2008
  • The brake systems of the rolling stocks are generally consisted of electrical and mechanical brake systems. Because of its inherent structure of the each brake system, the electrical brake system is mainly used at the high speed range while the mechanical brake system is used at the relatively lower speed range. It is desirable for the rolling stocks to apply the entire electrical brake system. However, since the brake force from electric brake system is not enough to stop the rolling stock within the legal stop distance. Therefore, the mechanical brake system is indispensable to rolling stocks. In general, the vast majority of the world trains are equipped with mechanical braking systems which use compressed air as the force to push block on to wheels or pads on to discs. These mechanical systems are known as air brake or pneumatic brakes. For the air brake system, basically huge scale air compressor is equipped and the long pipe line is complexively connected. Since mass of these air brake components, it is difficult to be a light weight equipment and the long pipe line raise the maintenance problem. In order to overcome these problems of air brake system, the hydraulic brake system is proposed in this research. The hydraulic brake system makes the whole weight of brake equipment be light and large braking force can be applied. Therefore, in this research, the validity and advantages of applying the hydraulic brake system are reviewed.

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750kW급 풍력발전기의 부하 모니터링 시스템에 관한 연구 (A Study on the Mechanical loads Monitoring System of a 750kW Wind Turbine)

  • 남윤수;장후영;윤태준
    • 산업기술연구
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    • 제28권A호
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    • pp.63-69
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    • 2008
  • The exact load measurements for the mechanical parts of wind turbine are important step both for evaluation of specific wind turbine design and for a certification process. A wind turbine monitoring system is essential equipment for mechanical load analysis of a wind turbine. This monitoring system is based on IEC 61400-13 and strain gage are used to measure a mechanical load of wind turbine. Also this system monitors signals from a meteorological mast. The measured signals which are sampled at 200 Hz are automatically saved on a data file in the unit of ten minutes. A detail explanation for the developed wind turbine monitoring system is presented in this study.

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경전철 급전시스템의 최적설계에 관한 연구 (A Study on the Optimal Design for DC traction system of Light Rail Transit)

  • 전용주;조성준;백병산;김국진;김종구
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 B
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    • pp.1251-1253
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    • 2001
  • This paper presents on capacity design of DC-fed-traction system. The system is introduced including a characteristics of train, feeding network configuration, and design method of substation arrangements. Optimal design procedures is described, and program for capacity computation of the system is presented using the nodal equation, K.C.L, K.V.L, Ohm's law and superposition theory. For the proof of the proposed algorithm, we accomplished the simulation of DC traction system for HA-Nam LRT. By considering whole component in DC traction system the conclusion will be much precise.

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Evaluation of the characteristics of the reflection plate to measure defects in the invisible area using infrared thermography

  • Kim, Sang Chae;Park, Il Cheol;Kang, Chan Geun;Jung, Hyunchul;Chung, Woon Kwan;Kim, Kyeong Suk
    • Nuclear Engineering and Technology
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    • 제52권4호
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    • pp.856-862
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    • 2020
  • Defect inspection system for industrial applications takes the important portion. Non-destructive inspection method has been significantly improved. Infrared thermography, as one of method for non-destructive inspection, can provide relatively precise data and quick inspection time. This study, it was performed to measure defect according to the measurement limit of the non-visible areas such as the back surface of the pipe using reflection plate using reflection plate based on Infrared thermography. The materials of the reflection plate were determined in consideration of the space limitation and the thermal characteristics, and defects were detected by the manufactured reflection plate. Detection of defect in non-visible area using the candidate materials for reflection plate was conducted.

플라즈마 응용 고 에너지 점화 시스템 개발 및 적용 (Development and Application of High Energy Ignition System Using Plasma)

  • 강혜현;최두원;박진일;이종화;박경석;안종영
    • 한국자동차공학회논문집
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    • 제22권3호
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    • pp.148-156
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    • 2014
  • This study is a follow-up study of "Development of Plasma Ignition System" was presented at the 2013 KSAE spring conference. This study compares lean limit of conventional ignition system with plasma ignition system on constant volume combustion test & Engine Combustion test.

Development of a System for Diagnosing Faults in Rotating Machinery using Vibration Signals

  • Oh, Jae-Eung;Lee, Choong-Hwi;Sim, Hyoun-Jin;Lee, Hae-Jin;Kim, Seong-Hyeon;Lee, Jung-Youn
    • International Journal of Precision Engineering and Manufacturing
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    • 제8권3호
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    • pp.54-59
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    • 2007
  • It is widely recognized that increasing the accuracy and diversity of rotating machinery necessitates an appropriate diagnostic technique and maintenance system. Until now, operators have monitored machinery using their senses or by analyzing simple changes to root mean square output values. We developed an expert diagnostic system that uses fuzzy inference to expertly assess the condition of a machine and allow operators to make accurate judgments. This paper describes the hardware and software of the expert diagnostic system. An assessment of the diagnostic performance for five fault phenomena typically found in pumps is also described.