• Title/Summary/Keyword: 아메심

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One Dimensional Analysis for Dynamic Characteristics of Turbopump-fed Liquid Rocket Engine (1-D 모델링을 통한 터보펌프식 액체로켓 엔진의 동적 특성 해석)

  • Son, Min;Ku, Ja-Yeo
    • Journal of Aerospace System Engineering
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    • v.4 no.1
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    • pp.1-9
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    • 2010
  • As the rocket KSLV-1 called NARO was launched lately, development of domestic rocket technology has been accelerated elastically. Since the rocket technology needs a lot of empirical data, a variety of experiments should be done and lots of time have to be spent for accumulating the foundation of technology. However using a computer can be the solution to close a gap of technique because the simulation can be executed in short time against real experiments and calculate a multiplicity of cases easily. In this research, the transient analysis of turbopump-fed liquid rocket system was worked by the one dimensional modeling. The rocket system consists of the modulized components that are engine, turbopump and so on. For 70 ton class system, the rocket transient process of starting was studied and the performance analysis in steady condition was achieved. In addition, the estimation of nozzle internal flow was investigated by using a nozzle coefficient.

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Development of Simulator for Hydraulic Excavator (유압 굴삭기 시뮬레이터 개발)

  • Lim T.H.;Lee H.S.;Yang S.Y.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.2 no.1
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    • pp.9-14
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    • 2005
  • Hydraulic excavators have been popular devices in construction field because of its multi-workings and economic efficiency. The mathematical models of excavators have many nonlinearities because of nonlinear opening characteristics and dead zone of main control valve, oil temperature variation, etc. The objective of this paper is to develop a simulator for hydraulic excavator using AMESim. Components and whole circuit are expressed graphically. Parameters and nonlinear characteristics are inputted in text style. The simulator can be used to forecast excavator behavior when new components, new mechanical attachments, hydraulic circuit changes, and new control algorithm are applied. The simulator could be a kind of development platform for various new excavators.

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Analysis of Transient Characteristics for Turbopump-fed Liquid Propellant Rocekt Engine in Start-up (터보펌프식 액체 로켓 엔진의 시동 과도 특성 해석)

  • Son, Min;Kim, Duk-Hyun;Koo, Ja-Ye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.34-37
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    • 2010
  • One dimensional transient analysis was studied for turbopump-fed liquid propellant rocket engine(LRE) system in starting using AMESim. The effects of timing of gas generator fuel valve opening and gas generator ignition to start-up stability were researched for open cycle type system using LOX/RP-1 to propellants. Result show that the parameters and sequence on start-up should be considered to design optimized turbopump-fed LRE system.

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Closed loop type MCV(Main Control Valve) for Hydraulic Excavator (유압 굴삭기용 폐루프 타입 MCV(Main Control Valve))

  • Lim T.H.;Lee H.S.;Yang S.Y.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.864-870
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    • 2005
  • Hydraulic excavators have been popular devices in construction field because of its multi-workings and economic efficiency. The mathematical models of excavators have many nonlinearities because of nonlinear opening characteristics and dead zone of main control valve, oil temperature variation, etc. The objective of this paper is to develop a simulator for hydraulic excavator using AMESim. Components and whole circuit are expressed graphically. Parameters and nonlinear characteristics are inputted in text style. From the simulation results, fixed spring stiffness of MCV can't satisfy accuracy of spool displacement under whole P-Q diagrams. Closed loop type MCV containing proportional gain is proposed in this paper that can reduce displacement error. The ability of closed loop MCV is verified through comparing with normal type MCV using AMESim simulator. The simulator can be used to forecastexcavator behavior when new components, new mechanical attachments, hydraulic circuit changes, and new control algorithm are applied. The simulator could be a kind of development platform for various new excavators.

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A Study on the Dynamic Characteristics of a Electric Motor Clutch for Commercial Vehicles (상용차용 전동식 클러치의 동적특성에 관한 연구)

  • Cho, Ihnsung;Jung, Jaeyoun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.1
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    • pp.52-58
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    • 2014
  • To improve the performance of clutch actuator of clutch-by-wire system for commercial vehicles, it is necessary to understand the driving characteristics of the system. To explain and predict the effects of driving characteristics on clutch characteristics, AMESim software is used. The simulation model of clutch-by-wire system is developed in the AMESim environments under the geometrical dimensions and driving mechanisms of the clutch-by-wire system, such as the rotation speed of the DC motor, the gear ratio of the reducer, the design parameters of the release fork, the coefficient of the clutch diaphragm spring, and so on. The results show that the theoretical analysis of the clutch-by-wire system for commercial vehicles using the AMESim software find out the driving characteristics of the clutch actuator, and predict the performance characteristics of the clutch-by-wire system.

Hydraulic Modal Analysis of High-Pressure Common-rail Fuel Injection System for Passenger Vehicle (승용 CR 연료분사시스템에 대한 유압 Modal 분석)

  • Sung, Gisu;Kim, Sangmyeong;Kim, Jinsu;Lee, Jinwook
    • Journal of ILASS-Korea
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    • v.20 no.1
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    • pp.14-19
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    • 2015
  • Recently, R&D demand for environmental friendly vehicle has rapidly increased due to its global environmental issues such as global warming, energy and economic crisis. Under this situation, the most realistic alternative way for environmental friendly vehicle is a clean diesel vehicle. The common-rail fuel injection system, as key technology of clean diesel vehicle, consists of a high pressure pump, common-rail, high pressure fuel line and electronic control injector. In common-rail high-pressure fuel injection system, high pressure wave of injection system and geometry of injector elements have a major effects on high-pressure fuel spray. Therefore, in this study, the numerical model was developed for analysis about the common-rail fuel pressure pulsation by using AMESim code. We could secure stability of common-rail high-pressure fuel injection system through optimal design of fuel line.

Study on Coupling Drive Mechanism for Multi-Axis Pintle Thrusters (다축 핀틀 추력기에 적용을 위한 구동장치 연동 메커니즘 방안연구)

  • Lee, Jaecheong;Huh, Hwanil;Lee, Hosung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.8
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    • pp.722-730
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    • 2015
  • Drive mechanism of multi-axis pintle thrusters for DCS(Divert Control System) was designed to meet the needs of minimizing the number of driving motors. In this study, preliminary model was designed in order to implement appropriate pressure control and thrust distribution. Based on the preliminary model study, the drive mechanism for DCS multi-axis pintle thrusters using piston was designed and evaluated by using AMESim software. Results show that three driving motors are enough to actuate four pintle thrusters.

Analysis of Dynamic Characteristics and Performances of Vent-Relief Valve (산화제 벤트/릴리프밸브의 동특성 해석 및 작동성능분석)

  • Jang, Je-Sun;Koh, Hyeon-Seok;Han, Sang-Yeop;Lee, Kyung-Won
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.741-747
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    • 2010
  • Vent-relief valve performed as a safety-valve combination for liquid propellant feeding system of space launch vehicle, which can vent the vaporized oxygen vapor during both filling cryogenic oxidizer into tank and flight. We have designed vent-relief model by using the AMESim code to predict dynamic characteristics and simulate pneumatic behavior of valve. To validate valve model we have compared by opening time in vent model, and opening/closing pressure by mathematical methods and improved the accuracy through numerical flow analysis by using FLUENT code. In this study, we had verified design parameters and analyzed operating performances. We can use these analysis results to precedent development study on propellant feeding system of Korea Space Launch Vehicle.

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A Study of Peak Pressure Reduction Control of Electro Hydraulic System using Convolution (컨볼루션을 이용한 전자 유압 시스템의 피크압력 저감 제어 연구)

  • Kim, Kyung Soo;Jeong, Jin Beom;Ryuh, Beom Sahng
    • Journal of Drive and Control
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    • v.16 no.3
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    • pp.59-66
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    • 2019
  • Hydraulic systems are essential for most of the construction equipments due to their various advantages, such as very powerful, quick response speed, precision control and remote control. Moreover, they are necessary to apply the electro hydraulic systems for precise and remote controls. Operating the small electronic joystick of the remote controller for the control of a multipurpose work machine with remote control technology increases the possibility of a sudden operation compared to the use of a conventional hydraulic joystick. When a joystick is suddenly operated, the peak pressure is generated in the system due to the quick response of the system. Then a vibration is generated due to the peak pressure, which causes instability to the operation of the construction equipment. Therefore, in this study, we confirmed the level of reduction of peak pressure occurring in the electro hydraulic system by using AMESim, when the output signal of the step shape generated by the sudden operation of the electronic joystick was changed by using the convolution operation.

A Study on Simulation of Piston Number for Development of Axial Piston Pump for Wheeled Armored Vehicle (차륜형 장갑차용 액시얼 피스톤 펌프 개발을 위한 피스톤 수에 대한 시뮬레이션에 관한 연구)

  • Choi, Seong Woong;Lee, Chang Don;Yang, Soon Yong
    • Journal of Drive and Control
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    • v.16 no.1
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    • pp.14-21
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    • 2019
  • Axial piston pump is a significant part in wheeled armored vehicle, for generating hydraulic power of vehicle power system. The Axial Piston Pump is a high-performer, core functional item that is developed and applied to most of the military models in the development of military weapon systems. However, in the case of military equipment, there are conditions of limited size and weight required depending on the operating conditions and the operating environment. Under these conditions, it is required that the performance and the environmental resistance are verified to exert the required output. A unique technology is needed for the development of such equipment both in the present and in the future. Therefore, in this study, mathematical modeling of an axial piston pump is presented as a basic data for securing proprietary technology. In addition, a simulation model is designed and compared with the models of six kinds of pistons through simulation. It was established that when the number of pistons of the axial piston pump, which is the development objective, is seven, the model is suitable for the wheeled armored vehicle.