• Title/Summary/Keyword: Valve simulation

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A design and simulation of a hydraulic control valve in transmission (트랜스 미션에 유압식 콘트롤밸브의 설계와 시뮬레이션)

  • 곽희성
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.167-174
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    • 1997
  • In this paper, the mathematical model of the hydraulic control valve is formulated, that is, this dynamic modeling which includes the motion equations and continuity equations can analyze the dynamic characteristics of the hydraulic control valve. The control valve for the transmission has the Over Speed Protection to protect a hydraulic travel motor. Therefore, this simulation shows the over speed protection and researches the main design parameters. The results of the computer simulation were assured through the experiment. From the comparison between both results, it is shown that this simulation program is useful and effective.

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Characteristics Analysis of Pilot Operated Pressure Control Valve (파이로트 구동용 압력제어밸브의 특성 해석)

  • 윤소남;최영호;함영복;김광영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.725-728
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    • 2002
  • In this Paper, a mathematical model describing the dynamics of pilot operated pressure control valve was derived. A attempt to analyze the Parameters(seat diameter, cone angle, spring stiffness, control volume) which relate to the performance of the object valve was carried out. Simulation using AMESim as a simulation tool was operated, and verified the validity of our simulation by means of comparison our simulation results with an experimental results of the pilot operated pressure control valve.

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A Simulation Study of Position Control Performance of a Shape Memory Alloy-Actuated Flow Control Valve (형상기업합금을 이용한 유량제어밸브의 위치제어 적용 시뮬레이션)

  • Choi, Su-Hyun;Lee, Han-Suk;Kuk, Kum-Hoan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.8
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    • pp.79-87
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    • 1999
  • In this study, a new type of flow control valve which is SMA actuated flow control valve is presented. The flow control valve is actuated by a small motion of shape memory alloy. The performance of this valve as a position control component is analyzed by computer simulation. A variable structure control technique is applied for the position control by the flow control valve. The position control performance of the valve is evaluated on the step responses of a PID control by a electrohydraulic servo valve. For the simulation study, first, the mathematical model of a hydraulic system, which is consisted of the flow control valve and a hydraulic cylinder, is formulated. This mathematical model and the designed variable structure control algorithm are then combined by the MATLAB software. The same sequence of work is carried out for the PID position control system with a electrohydraulic servo valve. The simulation results show the validity of the new type of flow control valve as a variable position control component.

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Numerical Analysis of the 3-D Flow Field in a Globe Valve Trim under High Pressure Drop (고차압 제어용 글로브 밸브 트림 내부의 3차원 유동장 해석)

  • Yoon, Joon-Yong;Byun, Sung-Joon;Yang, Jae-Mo;Lee, Do-Hyung
    • The KSFM Journal of Fluid Machinery
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    • v.4 no.3 s.12
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    • pp.14-20
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    • 2001
  • Numerical analysis of the three dimensional turbulent flow field in a complex valve trim is carried out to confirm the possibility whether this simulation tool can be used as a design tool or not. The simulation of the incompressible flow in a glove valve is performed by using the commercial code. CFD-ACEA utilizes the finite volume approach as a discretization scheme, and the pressure-velocity coupling is made from SIMPLEC algorithm in it. Four flow cases of the control valve are investigated, and the valve flow coefficient for each case is compared with the experimental data. Simulation results show a good agreement with the experiments, and it is observed that the cavitation model improves the simulation results.

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A Study on the Stress Simulation for the Body Design of a PFA-lined Plug Valve (PFA 라이닝 플러그 밸브 설계를 위한 밸브 본체의 응력 시뮬레이션)

  • Kang, Shin-Han
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.3
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    • pp.500-506
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    • 2009
  • This study, is aimed to support the valve design engineer by a CAE simulation on the body of a PFA-lined plug valve, and focuses on static stress analysis, location of the weak point on bending and stiffness of the valve body. To determine whether the valve body can resist being transformed by loads, 1 simulated the stress distribution using CAD/CAE softwares. The 'step' file converted by CAD software after solid modeling is imported to the CAE software. Through simulation procedure, it is shown that the designed-solid-model fur a valve body has stiffness on bending and torsion but has weakness for side bending moment. Also, it is expected that the valve design engineer will understand the basic process of CAE and will be able to apply on his task.

A simulation model of valve train dynamics for cam profile optimizations (캠 형상 최적설계를 위한 밸브 트레인 동특성 해석 모델)

  • 김도중
    • Journal of the korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.53-63
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    • 1993
  • A numerical modeling technique is proposed for computer simulations of high speed valve train dynamic terms in the valve spring reaction forces are calculated using linear vibration theory for given kinematic valve motions. Because the spring dynamics are analyzed before the time stepping integration, spring surge phenomena can be included without using additional computer time. In addition to that, steady state response of the valve dynamics can be obtained by just one cycle simulation. Consequently, valve train dynamics can be simulated very quickly without noticeable errors in accuracy. The experimental result prove the computer model developed here is accurate and also computationally efficient. The model is especially useful for cam profile optimizations.

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Modelling of Optimum Design of High Vacuum System for Plasma Process

  • Kim, Hyung-Taek
    • International journal of advanced smart convergence
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    • v.10 no.1
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    • pp.159-165
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    • 2021
  • Electronic devices used in the mobile environments fabricated under the plasma conditions in high vacuum system. Especially for the development of advanced electronic devices, high quality plasma as the process conditions are required. For this purpose, the variable conductance throttle valves for controllable plasma employed to the high vacuum system. In this study, we analyzed the effects of throttle valve applications on vacuum characteristics simulated to obtain the optimum design modelling for plasma conditions of high vacuum system. We used commercial simulator of vacuum system, VacSim(multi) on this study. Reliability of simulator verified by simulation of the commercially available models of high vacuum system. Simulated vacuum characteristics of the proposed modelling agreed with the observed experimental behaviour of real systems. Pressure limit valve and normally on-off control valve schematized as the modelling of throttle valve for the constant process-pressure of below 10-3 torr. Simulation results plotted as pump down curve of chamber, variable valve conductance and conductance logic of throttle valve. Simulated behaviors showed the applications of throttle valve sustained the process-pressure constantly, stably, and reliably in plasma process.

Numerical Simulation of Flow in a Total Artificial Heart (인공심장내의 혈류유동의 컴퓨터 시뮬레이션)

  • Kim, S.H.;Chandran, K.B;Chen, C.J.
    • Proceedings of the KOSOMBE Conference
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    • v.1992 no.05
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    • pp.123-126
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    • 1992
  • In this paper, a numerical simulation of steady laminar and turbulent flow in a two dimensional model for the total artificial heart is presented. A trileaflet polyurethane valve was simulated at the outflow orifice while the inflow orifice had a trileaflet or a flap valve. The numerical solutions of the simulated model show that regions of relative stasis and trapped vortices were smaller wi thin the ventricular chamber wi th the flap valve at the inflow orifice than that with the trileaflet valve. The predicted Reynolds stresses distal to the inflow valve within the ventricular chamber were also found to be smaller with the flap valve than with the trileaflet valve. Analysis of the numerical solutions suggests that geometries similar to the flap valve(or a tilting disc valve) results in a better flow dynamics within the total artificial heart chamber compared to a trileaflet valve.

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Optimization of valve events in a 4 cycle reciprocating engine using measured intake and exhaust port pressures (4사이클 왕복동식 엔진에 있어서 흡배기 변동압 측정치를 이용한 흡기효율 최적화 컴퓨터 시뮬레이션)

  • 오세종;진영욱;정재화
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.3
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    • pp.500-507
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    • 1989
  • The improvement of volumetric efficiency of air charging into combustion chamber is a primary requirement to obtain better mean effective pressure of an engine. Since parameters such as the air resistances in intake and exhaust flow passages, valve lift and valve timing influence greatly to the volumetric efficiency, it is very convenient and time saving if we can optimize these parameters by computation before we enter into long time fact finding engine tests. In this study we have developed a semi-empirical engine simulation program for the determinations of intake and exhaust valve timings, valve lifts, intake and exhaust port diameters in order to obtain highest volumetric efficiency. In this computation it requires only the measured variational pressures in intake and exhaust port. Using these variational pressures as an input data for our simulation program, we can calculate volumetric efficiency more accurately and can save computing time drastically. To confirm the validity of our simulation program we have made engine operation test in parallel and taken the experimental data. Comparing the computation result with the experimental data obtained through real engine test it has shown only the difference of 3%.

Simulations of Effects of Variable Conductance Throttle Valve on the Characteristics of High Vacuum System

  • Kim, Hyung-Taek;Cho, Han-Ho
    • International Journal of Internet, Broadcasting and Communication
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    • v.7 no.2
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    • pp.28-35
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    • 2015
  • Thin film electronic devices which brought the current mobile environment could be fabricated only under the high quality vacuum conditions provided by high vacuum systems. Especially for the development of advanced thin film devices, constant high quality vacuum as the deposition pressure is definitely needed. For this purpose, the variable conductance throttle valves were employed to the high vacuum system. In this study, the effects of throttle valve applications on vacuum characteristics were simulated to obtain the optimum design modelling of variable conductance of high vacuum system. Commercial simulator of vacuum system, $VacSim^{(multi)}$, was used on this investigation. Reliability of employed simulator was verified by the simulation of the commercially available models of high vacuum system. Simulated vacuum characteristics of the proposed modelling were agreed with the observed experimental behaviour of real systems. Pressure limit valve and normally on-off control valve were schematized as the modelling of throttle valve for the constant process-pressure of below $10^{-3}torr$. Simulation results were plotted as pump down curve of chamber, variable valve conductance and conductance logic of throttle valve. Simulated behaviors showed the applications of throttle valve sustained the process-pressure constantly, stably, and reliably.