• 제목/요약/키워드: Dynamic flow control

검색결과 578건 처리시간 0.035초

다이어프램형 밸브의 유량특성과 동적성능에 관한 연구 (A Study on Flow Rate Characteristic and Dynamic Performance on Diaphragm Solenoid Valve)

  • 정찬세;양순용
    • 드라이브 ㆍ 컨트롤
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    • 제10권3호
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    • pp.27-33
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    • 2013
  • Solenoid valve has used in various industrial field extensively. A solenoid valve has different size, shape and method of operation accordantly to industrial field. Many researchers study on kinds of solenoid valve such as flow rate, dynamic, magnetic field, valve shape and operating method. But the flow rate characteristic and dynamic response time performance on the diaphragm valve are not studied. This paper describes the flow rate characteristic and dynamic response time performance on the diaphragm valve. At first, the diaphragm valve is simulated in AMESim simulation tool. AMESim model found that an effect of valve performance depends on parameter. The parameter is the diaphragm orifice area. And the performance test bench confirms the effect in this parameter. Finally, it finds out the flow rate characteristic and dynamic response time performance on the diaphragm valve.

실물실험을 통한 다이나믹 유량밸런싱 적용 공동주택 세대의 에너지소비량 평가 (Evaluation of Energy Consumption through Field Measurement at the Apartment Housing Unit Using Dynamic Flow Rate Balancing)

  • 류성룡;정창헌;조현
    • 한국지열·수열에너지학회논문집
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    • 제12권4호
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    • pp.15-20
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    • 2016
  • Even though the control device of the heating system works well, insufficient water flow rates can degrade control performance and thermal comfort. The water flow rate should be adjusted appropriately to cope with the heating load of each zone. In order to solve these problems, a new balancing concept 'dynamic balancing' was proposed where a balancing valve opening can be automatically modulated according to the heating condition of the room. This study analyzed the effects of dynamic balancing upon indoor thermal environment and energy consumption in a radiant floor heating system through field measurement. Under part-load conditions, the use of a dynamic balancing is a more effective method to reduce energy consumption and to prevent a cavitation. Dynamic balancing is able to help boost the temperature of a room in the start-up period.

UPFC의 동적 성능해석을 위한 시뮬레이션 모형 (Simulation Model for Dynamic Performance Analysis of UPFC)

  • 한병문;최대길;신익상
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.479-481
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    • 1996
  • This paper describes a simulation model to analyze the dynamic performance of Unified Power Flow Controller which ran flexibly adjust the active and reactive power flow through the ac transmission line. An equivalent circuit to analyze the basic principle for the whole system operation was developed and a control system for the Unified Power Flow Controller was derived using vector control method. A computer simulation model with EMTP code was also conceived to evaluate the performance of the Unified power Flow Controller. The simulation results show that Unified Power flow Controller is very effective for controlling the power flow and damping the subsynchronous resonance in the power system.

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시뮬레이션과 축소모형에 의한 UPFC의 성능해석 (Performance Analysis of UPFC by Simulation & Scaled Hardware Model)

  • 박지용;백승택;김희종;한병문;한학근
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제48권10호
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    • pp.579-586
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    • 1999
  • This paper describes a simulation model and a scaled hardware model to analyze the dynamic performance of Unified Power Flow Controller, which can flexibly adjust the active power flow through the ac transmission line. The design of control system for UPFC was developed using vector control method. The results of simulation and scaled hardware test show that the developed control system works accurately. Both models would be very effective for analyzing the dynamic performance of the Unified Power Flow Controller.

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유압공급장치의 동특성에 관한 연구 (Study of the dynamic characteristics of a hydraulic power supply)

  • 이성래
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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    • pp.1172-1177
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    • 1993
  • Dynamic characteristics of a hydraulic power supply are studied theoretically and computationally. The transfer function between the supply pressure and the load flow is derived considering relief valve dynamics, accumulator dynamics, and flow line dynamics. Frequency responses and time responses are obtained in many conditions using the transfer function and nonlinear mathematical model respectively.

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파일럿 비례압력제어밸브의 정특성 및 동특성에 관한 실험적 분석 (Experimental Analysis of the Static and Dynamic Characteristics for a Pilot Proportional Pressure Control Valve)

  • 정헌술;남지우
    • 유공압시스템학회논문집
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    • 제8권4호
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    • pp.9-16
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    • 2011
  • Because of the increasing demand on the high precision and high response of a machinery, proportional control valves are widely adopted at various application fields. This paper studies on the static and dynamic characteristics of a pilot proportional pressure control valve. An experimental apparatus including hydraulic pump, variable speed inverter, pressure and flow sensors and data aquisition system was set up. And various experiments such as P-Q-V curves, step responses due to input voltage and flow rate, hysteresis, frequency response of the proportional valve was carried out and the results are discussed.

가공송전선의 송전용량을 증가시키기 위한 동적송전용량 시스템의 설계 (A Design for Dynamic Line Rating System to increase Overhead Transmission Line Capacities)

  • 김성덕
    • 조명전기설비학회논문지
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    • 제25권7호
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    • pp.72-77
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    • 2011
  • Dynamic Line Rating (DLR) techniques have been greatly worthy of notice for efficiently increasing transmission capacity as well as controlling load-flow in overhead transmission lines, in comparison with the existing power system operating with Static Line Rating (SLR). This paper describes an utilization method to implement DLR control system for old transmission lines built in the first stage using the ground clearance design standard with lower dips. The suggested DLR system is focused on designing as temperature control system rather than current/load control system. Based on several performance for conductor temperatures, it is shown that DLR system with efficiency can be implemented.

Load Flow Calculation and Short Circuit Fault Transients in AC Electrified Railways

  • Hosseini, Seyed Hossein;Shahnia, Farhad
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.2203-2206
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    • 2005
  • A load flow and short circuit fault simulation of AC electrified railway distribution systems is presented with DIgSILENT PowerFactory software. Load flow of electrified railways distribution system with concerning multi train lines and dynamic characteristics of train load is studied for different time laps. The dynamic characteristics of train load in starting and braking conditions with different starting and stopping times and its moving positions makes the load flow complicated so there is a great need in studying the effects of electrified railways on load flow. Short circuit fault transients is also studied and simulated for both power system or traction distribution system and their effects on the operation of the train sets is investigated.

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동적상사를 고려한 DACS 검증용 공압 시험장치 설계 (Design of Cold-flow Test Equipment Considering Dynamic Similarity for DACS Verification)

  • 배상호;장홍빈;박익수
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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    • pp.374-377
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    • 2017
  • TDACS의 작동 성능 검증 시험을 수행하기 위해서 유동시험 장치를 설계하였다. 이를 위해서 고체 추진기관 연소관 및 유동시험에서의 압력 거동을 모델링하였고 각 모델의 동적 특성을 나타내는 응답 시간을 구하였다. 본 논문에서는 유동시험 장치의 시스템 응답 시간을 고체추진기관 연소관의 특성과 같아지는 조건을 구하고 이를 설계에 반영함으로써 연소 환경에서 동적 응답특성을 검증하는 것과 유사한 결과를 갖도록 하였다.

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복합진동계의 진동 인텐시티 능동 제어 (Active Control of Vibrational Intensity in a Compound Vibratory System)

  • 김기만
    • 한국정밀공학회지
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    • 제19권6호
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    • pp.109-118
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    • 2002
  • The vibrational intensity and the dynamic response of a compound vibratory system had been controlled actively by means of a feedforward control method. A compound vibratory system consists of a flexible beam and two discrete systems - a vibrating source and a dynamic absorber. By considering the interactive motions between discrete systems and a flexible beam, the equations of motion for a compound vibratory system were derived using a method of variation of parameters. To define the optimal conditions of a controller the cost function, which denotes a time averaged power flow, was evaluated numerically. The possibility of reductions of both of vibrational intensity and dynamic response at a control point located at a distance from a source were fecund to depend on the positions of a source, a control point and a controller. Especially the presence of a dynamic absorber gives the more reduction on the dynamic response but the less on the vibrational intensity than those without a dynamic absorber.