• Title/Summary/Keyword: 모터링

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Effect of Stroke Changes on the In-Cylinder Flow Field in a Four-Valve SI Engines (Stroke변화가 Four-Valve SI 엔진 실린더내 유동장에 미치는 영향)

  • 유성출
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.1-8
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    • 2001
  • The flow field inside a cylinder of four-valve Sl engine was investigated quantitatively using a three-dimensional Laser Doppler Velocimetry system, to determine how stroke changes affect the flow field. The purpose of this work was to develop quantitative methods which correlate in-cylinder flows to engine performance. For this study, the sane intake manifold, engine head, cylinder, and the piston were used to examine the flow characteristics in different strokes. Quantification of the flow field was done by calculating three major parameters which are believed to adequately characterize in cylinder motion. These quantities were TKE, tumble and swirl ratios. The LDV results reveal that flow patterns are similar, the flow velocities scale with piston speed but another parameters such as TKE, and tumble and swirl numbers are not the same for different stroke systems.

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A Study on the Characteristics of In-Cylinder Air Flow with 3-D LDV Measurement (3차원 LDV를 이용한 실린더내 공기 유동특성에 관한 연구)

  • Yoo, S.C.
    • Journal of ILASS-Korea
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    • v.11 no.1
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    • pp.39-47
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    • 2006
  • In-cylinder flows in a motored 3.5L four-valve SI engine were investigated quantitatively using three-component LDV system, to determine how engine configuration affects the flow field. The purpose of this work was to develop quantitative methods which correlate in-cylinder flows to engine performance. For this study, two distinct intake/piston arrangements were used to examine the flow characteristics. Quantification of the flow field was done by calculating two major parameters which are believed to characterize adequately in-cylinder motion. These quantities were turbulent kinetic energy(TKE) and tumble ratio in each plane at each crank angle. The results showed that in-cylinder flow pattern is dominated by the intake effects and two counter rotating vortices, developed during the intake stroke, produced relatively low tumble ratio. Therefore, the applicability of these quantities should be carefully considered when evaluating characteristics resulting from the complex in-cylinder flow motions.

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A Prediction Model of Piston Slap Induced Vibration Velocity of Engine Block Surface (피스톤 슬랩에 의해 발생되는 엔진 블록의 표면 진동 속도 예측 모델)

  • 안상태;조성호;김양한;이동수
    • Journal of KSNVE
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    • v.9 no.3
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    • pp.587-592
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    • 1999
  • Piston slap is one of the sources producing engine block surface vibration and mechanical noise. To analyze piston slap-induced vibration, a realistic but simple model is proposed and verified experimentally. A piston is modeled by 3 degree of freedom system and an impact point between piston skirt and cylinder wall by 2 degree of freedom system. Numerical simulation estimates impact forces of piston in cylinder, and the engine block surface vibration response is predicted by the convoluton of the impact forces with measured impulse responses. Experimental verification on the predicted response has been also performed by using a commercial 4-cylinder diesel engine. the predicted and experimental vibration responses confirm that the suggested model is practically useful.

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Remote control for Fan Unit with BLDC Motor using DeviceNet (DeviceNet을 이용한 BLDC모터헝 FAN UNIT의 원격제어 연구)

  • Lee, J.B.;Sung, H.K.;Kim, Y.O.;Lim, J.H.
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.126-128
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    • 2002
  • 본 논문은 일반적으로 클린룸 시스템등에서 사용되는 여러개의 BLDC모터를 장착한 Fan Unit를 산업용 네트워크인 DeviceNet을 이용하여 버스형태인 2Line으로 제어기에서 제어하고 또한 Local에서 발생되는 상황을 모니터링 하는 방식에 대한 것이다. 클린룸등에서 사용되는 Fan은 대부분 100여개 이상 사용되므로 Controller Area Network(CAN)기반인 DeviceNet으로 아주 효율적으로 제어가 가능하며 본 논문에서는 이를 실험을 통하여 제시하였다.

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In-Cylinder Air Flow Measurements and Turbulent Kinetic Energy Analyses (실린더 내 공기유동 측정 및 난류운동에너지 해석)

  • Yoo, S.C.
    • Journal of Power System Engineering
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    • v.11 no.4
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    • pp.5-11
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    • 2007
  • 본 연구는 SI기관 실린더 내의 유동장 변이 과정을 3차원 LDV 측정 기술을 사용하여 흡입과 압축과정 동안 정량적으로 분석하였다. 실험은 헤드에 각각 2개의 흡입밸브와 배기밸브를 갖는 기관이 모터링되는 공회전 상태에서 실시하였다. 지난 30년 동안 텀블과 스월은 실린더 내의 평균 유동 정량화에, 난류운동에너지는 난류 측정에 많이 사용되어 왔다. 그러나 텀블은 solid body 회전 유동을 비교하는데 적절하며, 서로 다른 유동 패턴 비교에는 부적절 하다는 것이 보고되고 있는 실정이다. 3차원 LDV시스템의 우수한 공간 분석 능력은 순간적인 유동장구조와 더불어 상대적으로 미세한 유동장의 구조 까지도 측정이 가능 하도록 하였다. 따라서 측정한 결과로부터 유동장의 난류운동에너지 등가면을 계산할 수 있었다. 본 실험 결과는 실린더 내의 난류 유동장 특성을 난류운동 에너지 등가면 정보를 이용하여 세심하게 관찰할 수 있음을 제시하고 있다.

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A study on TDC crank angle determination by motoring pressure measurement (모터링 압력측정을 통한 상사점 결정방법에 관한 연구)

  • 한정옥;이영주;김승수
    • Journal of the korean Society of Automotive Engineers
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    • v.10 no.6
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    • pp.39-47
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    • 1988
  • A disk photo sensor system was constructed and installed on engine for the crank angle measurement. Statically measured TDC crank angle data were compared with those obtained from engine motoring. Two groups of cylinder pressure data were compared each other, one measured by pressure transducer mounted flush on the combustion chamber and the other obtained with the help of spark plug type adaptor. A simple analysis on the gas flow in the spark plug type pressure transducer displayed reasonably good agreement with those from engine motoring tests. In various firing tests, the IMERs obtained from the spark plug type pressure transducer turned out to be higher than those from the flush mounted one at low engine speed while those two were nearly the same at high engine speed. As the engine load decreased the relative difference in IMEP measurement between the two types tended to be enlarged.

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Development of a Separate Type Rotary Engine (Separate Type Rotary Engine 개발)

  • Ki, Dockjong;Choi, Heeju
    • Journal of the Korean Society of Propulsion Engineers
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    • v.21 no.4
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    • pp.71-78
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    • 2017
  • New concept rotary engine initial prototype has been developed. Engine motoring, compressor pressure and fuel combustion were tested for engine mechanism and operability check. Merits and demerits, applicable areas of the engine have been investigated against reciprocating and Wankel rotary engines. It was found that this engine is best fit for small aircraft and it is better than existing engines for motorcycle, portable and hybrid car Genset too.

Multi Axis control system using Embedded Web Server (임베디드 웹 서버를 이용한 다축제어 시스템)

  • 김윤업;주형민;곽군평
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.775-778
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    • 2002
  • In this paper, we've studied multi axis control system using embedded web server which is controlling and monitoring the state data of moors. NanoWit2 Board has been ported Linux Operating System and fabricated Web Sorrel by GCC. Motion controller is used MCS-40 of e-MOTION Tek Co., Ltd. which receiving control signal, controlling motors and sending the state data to Web Server.

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Drill Wear Modelling based on Motor Current and Application to Real-time Wear Estimation (모터전류를 기초로 한 드릴 마멸 모델링과 실시간 마멸 추정)

  • Kim, H.Y.;Ahn, J.H.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.5
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    • pp.77-87
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    • 1995
  • In-process detection of drill wear is one of the most important technoligies for automatic, unmaned machining systems. In this study, an on-line drill wear estimation model based on spindle/Z-axis motor currents generated during the drilling process is proposed. The theoretical model is obtained by integrating the drilling process model and the servomechanism model. The drilling process model describes the relationship of drill wear and drilling torque/ thrust force, whereas the servomechanism model describes the relationship of drilling torque/ thrust force applied to motor and spindle/Z-axis motor current. Evaluation tests have shown that the proposed model is a good real-time estimator for drill wear.

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Structural Design and Analysis of Coiling Arm Unloading Machine for Submarine Cable (해저케이블 하역용 코일링 암 구조설계 및 해석)

  • Kim, Myung-Hwan;Kim, Dong-Hyun;Ryu, Gyeong-Joong;Sim, Jae-Park;Choo, Heon-Ho;Lee, Seung-Min
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.574-578
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    • 2011
  • 본 논문에서는 해저케이블 부두 하역용 장비인 코일링 암(coiling arm)에 대한 구조설계 및 해석을 수행하였다. 본 연구에서는 구조설계를 위해 3차원 CAD프로그램을 이용하여 모델링하였고 구조해석 프로그램을 이용하여 유한요소법에 기초한 전산해석 기법으로 해석을 수행하였다. 코일링 암의 목적에 맞추어 케이블을 케이블 탱크에 가이드 할 수 있도록 베어링 및 롤러를 설계하여 메인 암이 회전하고 케이블 가이드가 이동할 수 있도록 하였고, 기존의 외국 모델에서 사용하던 와이어 및 모터 시스템을 이용한 케이블 가이드 작동방식을 유압 시스템을 이용한 작동방식으로 변경하여 설계 및 제작이 쉽고 사용자가 직관적으로 작동할 수 있도록 설계하였다. 자중 및 케이블 하중에 대한 응력 해석을 수행하였고, 유압시스템에 의한 파손 가능성을 고려하였다. 케이블 가이드에 이동 및 지면 경사도에 따른 전복해석을 수행하였으며, 설치 장소를 고려한 풍하중 효과도 추가로 고려하였다. 본 연구를 통해 코일링 암의 작동방식을 개선하였으며 설계 및 해석 방법을 확립과 더불어 국내 최초로 실제 코일링 암을 제작 및 설치하였다.

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