• Title/Summary/Keyword: 동력 흐름

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A Study on Mass Flow Control and FEA of Plate Spring Attached in Piezoelectric Ceramic (세라믹 압전체에 부착된 판 스프링의 유한요소해석과 질량 흐름 제어에 관한 연구)

  • Lee, S.K.;Kim, Y.S.
    • Journal of Power System Engineering
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    • v.7 no.4
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    • pp.61-66
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    • 2003
  • In this paper, the relation between displacement of piezoelectric material and electric field was proposed. FEA was introduced to predict the displacement and reaction force of plate spring attached in the piezoelectric material. The relation between displacement of piezoelectric material forced by plate spring and applied electric field were further verified by experimental investigation. Also, the flow rate of gas in piezoelectric valve was examined by experiment. Finally, the relation between electric field and gas flow was derived. Based on these results, these relations can be used in the design of mass flow controller.

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Power Flow Analysis for Manufacturing of Planetary Gears in an 8-speed Automatic Transmission (II): 4-8 Speeds (8단 자동변속기의 유성기어 가공을 위한 동력 흐름 해석 (2) : 4-8단)

  • Lee, Kyoung-Jin;Kim, Jeong-Min
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.5
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    • pp.57-65
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    • 2016
  • The power flow of an 8-speed automatic transmission was analyzed using a lever analogy for the manufacturing of planetary gears. From the analysis, we found that the engine power was split between the first and second double-pinion planetary gears (DPPG1 and DPPG2), and was then passed to the DPPG3 for the fourth speed. For the fifth speed, the engine power was split between the DPPG1 and DPPG3. For the speeds 6-8, the engine power was passed only to SPPG2, while the seventh speed contained the power circulation.

A Study of Heat Transfer Phenomena in a Sensor Tube of a Mass Flow Controller (질량흐름 제어기의 센서 튜브에서 열전달현상에 관한 연구)

  • Lee, S.K.;Kim, Y.S.
    • Journal of Power System Engineering
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    • v.7 no.3
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    • pp.35-39
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    • 2003
  • In this paper, the heat transfer phenomena in the sensor tube of a mass flow controller(MFC) were studied by experiments. In the sensor tube of MFC, the difference of temperature between inlet and outlet was necessary for calculating the mass flow rate. Therefore, the relations of flow rate, generated heat by heating wire, sensor location and tube thickness were investigated to find the optimized condition. Based on this study, static and dynamic characteristics of sensor can be used for mass flow controller.

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A Study of Flow Characteristics using Reynold's Equation on Mass Flow Controller Actuated by Piezoelectric Material (압전체로 구동되는 질량흐름 제어기에서 레이놀즈 방정식을 이용한 유량 특성 연구)

  • Lee, S.K.;Kim, Y.S.
    • Journal of Power System Engineering
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    • v.7 no.3
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    • pp.69-73
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    • 2003
  • In this paper, the relation between displacement of piezoelectric disk and electric field was proposed. From Navier-Stokes equation and Reynold's equation, the relation between flow and gap of plate was determined. This models were further verified by experiments. Based on theoretical study and experimental verification, the proposed model between flow rate and voltage can be used in the design of mass flow controller in gas supplying system.

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Power Flow and Efficiency of Input Coupled type CVT combined Differential Gear Unit (차동기어장치를 적용한 입력축 연결방식 무단변속기의 동력흐름 및 효율해석에 관한 연구)

  • Kim, Yeon-Su;Choi, Sang-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.141-150
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    • 2000
  • Continuously variable transmission(CVT) combined differential gear unit has many advantages, which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral. It is known that such CVT can be classified into the input coupled type and the output coupled type according to the coupling location of continuously variable unit(CVU). In this paper, six different configurations of input coupled type CVT combined V-belt CVU and 2K-H I type differential gear unit are proposed. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. The propriety of derived formula and theoretical analysis are proven by various experiments.

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Analysis of Power Transmission Characteristics for Hydro-mechanical Transmission Using Extended Tetwork theory (확장된 네트워크기법을 이용한 정유압 기계식 번속장치의 동력전달 특성해석)

  • Kim, Won;Chung, Soon-Bae;Kim, Hyun-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.5
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    • pp.1426-1435
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    • 1996
  • In this paper. a network theory for generaltransmission systme was extended considering the direction of power flow. Also, a modified network model was suggested for a node with 4 shafts in order to verify the power flow. Based on the extended network theory, a simulation program was developed to analyze a hydro-mecaanical tranmission(HMT) system consistion of two hydrostatic pump motors, severeal planetary gear trains steer differential gear. The simulation result showed that the extendednotwork analysis program develped can predict the power circulation as well as the magnitude of torque and speed for each transmission element and can be used design tool for genaral power transmission system.

세계 각국의 전차의 발전추세 (2)

  • Park, Seong-Won
    • Defense and Technology
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    • no.4 s.182
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    • pp.58-71
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    • 1994
  • 제2차 세계대전이후 화력향상, 기동력 증대 방어력 보강 등에 중점을 두어 전차 개발이 이루어졌는데, 이런 흐름의 집대성이 독일의 Leopard, 미국의 M1, 영국의 Challenger의 등장으로 나타났다.

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The Development and Application of the Quasi-dynamic Wetness Index and the Dynamic Wetness Index (유사 동력학적 습윤지수와 동력학적 습윤지수의 개발과 적용)

  • Han, Ji-Young;Kim, Sang-Hyun;Kim, Nam-Won;Kim, Hyun-Jun
    • Journal of Korea Water Resources Association
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    • v.36 no.6
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    • pp.961-969
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    • 2003
  • Formulation of quasi-dynamic wetness index was derived to predict the spatial and temporal distribution of the soil moisture. The algorithm of dynamic wetness index was developed through introducing the convolution integral with the rainfall input. The spatial and temporal behaviors of the wetness index of the Sulmachun Watershed was calculated using the digital elevation model(DEM) and the rainfall data for two years. The spatial distribution of the dynamic wetness index shows most dispersive feature of flow generation among the three assumptions of steady, quasi-dynamic and dynamic. The statistical distribution of the quasi-dynamic wetness index and the dynamic wetness index approximate to the steady state wetness index as the time step is increased. The dynamic wetness index shows mixed distribution of the normalized probability density function.

Dynamic Characteristics of Automatic Transmission System Due to the Change of Planetary Gear Ratio (자동변속기내 유성기어비 변화에 의한 동력전달계의 동적특성)

  • 박영일;김영석
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.120-127
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    • 1998
  • In this study the dynamic characteristics of automatic transmission system due to the change of the planetary gear ratio is studied. To study the power flow and shift quality for power transmission the simulation program is developed using the modeling and analysis technique. The results from this study will be used in designing the basic structure of automatic transmission using planetary gear system.

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Research on optimization of traffic flow control at intersections (교차로 교통 흐름 제어 최적화에 관한 연구)

  • Li, Qiutan;Song, Jeong-Young
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.22 no.3
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    • pp.15-24
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    • 2022
  • At present, there are few studies on signal control of pedestrian traffic flow and non-motor traffic flow at intersections. Research on the optimization scheme of mixed traffic flow signal control can coordinate and control the overall traffic flow of pedestrians, non-motor vehicles and motor vehicles, which is of great significance to improve the congestion at intersections. For the traffic optimization of intersections, this paper starts from two aspects: channelization optimization and phase design, and reduces the number of conflict points at intersections from spatial and temporal right-of-way allocation respectively. Taking the classical signal timing method as the theoretical basis, and aiming at ensuring the safety and time benefit of traffic travelers, a channelization optimization and signal control scheme of the intersection is proposed. The channelization and phase design methods of intersections with motor vehicles, non-motor vehicles and pedestrians as objects are discussed, and measures to improve the channelization optimization of intersections are proposed. A multi-objective optimization model of intersection signal control was established, and the model was solved based on NSGA-II algorithm.