• 제목/요약/키워드: Point machine

검색결과 1,138건 처리시간 0.024초

엔진-발전기 시스템 모델링 및 제어특성에 관한 실험적 연구 (An Experimental Study upon Modeling and Control of Coupled Engine and Generator System)

  • 송승호;정세종;오정훈;함윤영;최용각;이광희
    • 한국자동차공학회논문집
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    • 제11권5호
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    • pp.163-169
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    • 2003
  • Modeling of engine-generator system and its control responses are investigated using high performance generator controller. The nonlinear engine is modeled using mean torque production model based on experimental engine map. In case of diesel engine. the amount of injected fief is decided by engine controller depending on the APS(Acceleration Position Sensor) value. An electromechanical generator model contains electrical circuits and moment of inertia. The generator controller maximizes the performance of generator using decoupling and linearized current feedback control. The generator control system consists of 3-phase IGBT inverter and controller board based on 32 bit floating point DSP. Field oriented control algorithm with digital current feedback control at 10kHz sampling enabled high performance torque and speed control of induction machine. Not only the steady state but also the transient state responses can be evaluated through a batch test of the engine generator system. Developed engine and generator modeling and control can be utilized in various applications such as Series Hybrid Electric Vehicle(SHEV), engine-generator for emergency, and other hybrid generation systems.

Fiber Sensor와 X-Y Robot을 이용한 용접선 추적에 관한 연구 (Study on the Seam Tracking by Using Fiber Sensor and X-Y Robot)

  • 배철오;박영산;이성근;김윤식;안병원
    • 한국정보통신학회논문지
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    • 제5권1호
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    • pp.144-149
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    • 2001
  • 산업현장의 열악한 작업중의 하나인 용접작업을 자동화하기 위한 방법으로 본 논문은 비접촉식 센서인 Fiber Sensor를 이용하여 용접선을 1차적으로 추적하고, 추적한 데이터를 텍스트 파일로 저장함과 통시에 2차적으로 추적한 용접선을 X-Y 로봇의 좌표값으로 다시 출력하여 용접을 하도록 하고 있다. Fiber Sensor를 통하여 읽어 들인 데이터는 Delphi Version 3.0을 이용하여 만들어진 프로그램을 통하여 처리하였고, I/O 입출력은 16 채널의 Relay Actuator 출력과 16 채널의 opto-isolated 입력이 가능한 PC의 ISA슬롯에 직접 삽입하여 사용하는 카드를 통해서 이루어졌다. 본 실험에서 용접선 추적은 직선, 기울기를 가진 직선 및 곡선에 관하여 추적을 행하였고, 추적한 데이터를 토대로 인버터 $CO_2$ 용접기를 사용하여 용접을 행하여 보았다.

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Fiber Sensor와 X-Y Robot을 이용한 용접선 추적에 관한 연구 (Study on the Seam Tracking by Using Fiber Sensor and X-Y Robot)

  • 배철오;이성근;김윤식;안병원;박영산
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2000년도 추계종합학술대회
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    • pp.558-561
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    • 2000
  • 산업 현장의 열악한 작업중의 하나인 용접작업을 자동화하기 위한 방법으로 본 논문은 비접촉식 센서인 Fiber Sensor를 이용하여 용접선을 1차적으로 추적하고, 추적한 데이터를 텍스트 파일로 저장함과 동시에 2차적으로 추적한 용접선을 X-Y 로봇의 좌표값으로 다시 출력하여 용접을 하도록 하고 있다 Fiber Sensor를 통하여 읽어 들인 데이터는 Delphi Version 3.0을 이용하여 만들어진 프로그램을 통하여 처리하였고, I/O 입출력은 16 채널의 Relay Actuator 출력과 16 채널의 opto-isolated 입력이 가능한 PC의 ISA 슬롯에 직접 삽입하여 사용하는 카드를 통해서 이루어졌다. 본 실험에서 용접선 추적은 직선, 기울기를 가진 직선 및 곡선에 관하여 추적을 행하였고, 추적한 데이터를 토대로 인버터 CO2용접기를 사용하여 용접을 행하여 보았다.

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A Classifiable Sub-Flow Selection Method for Traffic Classification in Mobile IP Networks

  • Satoh, Akihiro;Osada, Toshiaki;Abe, Toru;Kitagata, Gen;Shiratori, Norio;Kinoshita, Tetsuo
    • Journal of Information Processing Systems
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    • 제6권3호
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    • pp.307-322
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    • 2010
  • Traffic classification is an essential task for network management. Many researchers have paid attention to initial sub-flow features based classifiers for traffic classification. However, the existing classifiers cannot classify traffic effectively in mobile IP networks. The classifiers depend on initial sub-flows, but they cannot always capture the sub-flows at a point of attachment for a variety of elements because of seamless mobility. Thus the ideal classifier should be capable of traffic classification based on not only initial sub-flows but also various types of sub-flows. In this paper, we propose a classifiable sub-flow selection method to realize the ideal classifier. The experimental results are so far promising for this research direction, even though they are derived from a reduced set of general applications and under relatively simplifying assumptions. Altogether, the significant contribution is indicating the feasibility of the ideal classifier by selecting not only initial sub-flows but also transition sub-flows.

손목 착용형 웨어러블 기기의 가속도 센서를 사용한 사용자 인증 (User Authentication Using Accelerometer Sensor in Wrist-Type Wearable Device)

  • 김용광;문종섭
    • 정보처리학회논문지:컴퓨터 및 통신 시스템
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    • 제6권2호
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    • pp.67-74
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    • 2017
  • 본 논문은 손목 착용형 웨어러블 기기를 착용한 사용자의 걸음걸이에서 흔들리는 팔의 패턴을 통하여 사용자를 인증하는 방법을 제안한다. 기기에 내장된 가속도 센서를 이용하여 샘플링된 3축 가속도 센서 데이터를 수집한다. 수집한 데이터를 신호처리 기법을 통해 변환하여 걸음의 주기를 찾고, 푸리에 변환으로 걸음걸이의 주파수와 크기를 특징으로 추출하여, 2D 혼합 가우시안 모델(GMM)로 학습한 뒤, 신뢰구간 검증 방식으로 테스트한다. 실험결과 95%의 신뢰구간에서 사용자 평균 92%로 사용자를 인증함을 보였다.

최적합 구름 베어링용 Urea계 그리이스의 특성평가 연구 (A Study on Characteristics of the Optimum Urea Ope Grease for Rolling Bearings)

  • 한종대;김상근;박창남
    • Tribology and Lubricants
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    • 제21권1호
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    • pp.21-26
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    • 2005
  • Rolling bearings are assorted one of the most important machine elements. The various functions of bearings are greatly influenced by grease, and higher performance of rolling bearing greases is required to improve rolling bearing lubrication. The two conditions for optimum grease synthesis were selected by SSRED (Six Sigma Robust Engineering Design) program by using dropping points and OIT values respectively. And the optimized two urea/ether oil greases were synthesized to compare the performance. The typical physical properties of grease were investigated. And life test of these greases was conducted by rolling bearing grease life tester. The characteristics of the greases before and after life test were investigated using FTIR, microscope, SEM, TG/DSC, OIT and TAN meter. The optimized two greases showed longer life time than typical urea/ether oil grease. The optimized grease by means of OIT value showed higher performance such as long life time, low TAN value and high oil bleeding amount in comparison with the optimized grease using dropping point.

기술(技術)과 윤리(倫理)와 근대(近代) 이상도시(理想都市) Arcadia and Science Fiction (Technology, Morality and Modern Ideal Cities: Arcadia and Science Fiction)

  • 정진수
    • 건축역사연구
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    • 제7권1호
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    • pp.93-108
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    • 1998
  • The threads of this thesis are several theoretical issues of modern urban ideals. Modern architects and urban designers conceived their individual artifacts, which assumed to be laid out on the new settings totally different from the existing urban fabrics derived from inherently medieval ones. In the discussion of modern ideal society, the Industrial Revolution and the Enlightenment was a pivotal point. Innovations in technology and expanded living territories since the double revolution have been critical factors in the evolution of new ideas of urbanism. The tremendous success in science and technology led a way to the 'science-fiction' environment as a destined apocalyptic world. The dream, whether it was socialist or in any other believes, to a pastoral utopia beyond the capitalist society was represented through the ideal cities, which were modern versions of arcadia in the other approaches. Two sides of revolutionary ideas are presented as a futurist city and a garden city, which are on the separate notions but co-existed or overlapped in a single urban project such as in Le Corbusier urban schemes or even Tchumi's recent work, Parc de la Villette. Urban ideas in the twentieth century are based on urban naturalism, the notion of which was consistant from abbe Laugier to Le Corbusier, as well as machine aesthetics interpreted in terms of archeological research and modern technology.

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톱기계에서 절삭력 예측을 위한 역학모델 (A Mechanistic Model for the Prediction of Cutting Forces in Band Sawing)

  • 정훈;고태조;김희술
    • 한국정밀공학회지
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    • 제15권5호
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    • pp.145-152
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    • 1998
  • In this research, in order to predict the cutting force using a mechanistic model, specific cutting force was firstly obtained through the cutting experiments. Band sawing process is similar to a milling, that is multi-point cutting. Therefore it is not easy matter to evaluate specific cutting force. Thus, the thickness of workpiec was made smaller than one pitch of the saw in terms of fly cutting in the face milling process. Then the cutting force was predicted by analyzing the geometric shape of a saw tooth The tooth shape used in the research was raker set style that was generally used in band sawing. And a set of teeth is comprised of three teeth, those are ranked as left, straight and right. The mechanistic model was developed in this study considered those shapes of each tooth. From the validation experiments, the predicted cutting forces coincided well with the measured ones. Therefore the predicted cutting forces can be used for the adaptive control of saw engaging feed rate in the band sawing.

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Li2ZrO3 분리막의 제조와 이산화탄소 선택투과 전후의 기계적 특성 평가 (Fabrication of Li2ZrO3 Membrane and Evaluation on the Mechanical Properties Before and After CO2 Separation)

  • 박상현;이시우;유지행;우상국;이기성
    • 한국세라믹학회지
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    • 제44권1호
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    • pp.58-64
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    • 2007
  • In this study, we investigated $Li_2ZrO_3$ membrane as a candidate material for high-temperature $CO_2$ separation and evaluated mechanical property. $Li_2ZrO_3$ powder was synthesized by solid state reaction of $Li_2CO_3\;and\;ZrO_2$. Then we fabricated $Li_2ZrO_3$ tape using tape casting method. Dense $Li_2ZrO_3$ membrane prepared by sintering at $1600^{\circ}C$ for 2 h after pressing $Li_2ZrO_3$ tape using lamination machine. Mechanical properties before and after $CO_2$ absorption of fabricated $Li_2ZrO_3$ membrane such as Hertzian indentation, Victors hardness and 3-point bending testing were evaluated.

A Study on CFD Analysis Methods using Francis-99 Workshop Model

  • Le, Vu;Chen, Zhenmu;Choi, Young-Do
    • 한국유체기계학회 논문집
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    • 제19권5호
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    • pp.20-27
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    • 2016
  • The Francis-99 is a workshop initiated by the Norwegian University of Science and Technology (NTNU), Norway, and Lulea University of Technology (LTU), Sweden, in order to further validate the capabilities of the CFD technologies. The goal of the first workshop is to determine the state of the art of numerical predictions for steady operating conditions. When performing the CFD analysis, some geometry details are often neglected. In case of Francis Turbine, labyrinth seals are usually not include in the simulation domain, this may lead to inaccurate prediction of turbine efficiency. In this study, the CFD analysis for Francis-99 Workshop model has been performed for full domain of machine including top and bottom labyrinth seals. The efficiency value and distribution of velocity and pressure have been investigated and compared to the experimental data obtained from NTNU. By comparing the results, it was found that: With the top and bottom labyrinth seals in the domain, the CFD result was significantly improved in prediction of efficiency at all the operating point, especially at part load.