• 제목/요약/키워드: 미터링밸브

검색결과 22건 처리시간 0.023초

공기흡입식 추진기관용 연료조절밸브 시스템 안정성 향상에 관한 연구 (A Study on Stability Improvement of Fuel Metering Unit for Air Breathing Engine)

  • 이도윤;박종승;최현영;구자용
    • 한국항공우주학회지
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    • 제34권9호
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    • pp.76-81
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    • 2006
  • 본 논문에서는 공기흡입식 추진기관용 연료공급 시스템의 연료조절 밸브 시스템을 제안하였으며, 제안된 시스템은 서보밸브에 의해 구동되는 차압유지 밸브와 미터링 밸브로 구성되어 있다. 시스템 성능 및 안정성에 영향을 미치는 인자를 찾기 위해 비선형 및 선형 해석을 수행하였다. 이를 통해 미터링 밸브 오리피스 양단의 차압 유지량 ${\Delta}P$가 시스템 안정성에 영향을 미침을 예측하였고 실험 및 비선형 전산모사를 통하여 입증하였다. 해석 및 실험 결과차압 유지량 ${\Delta}P$를 줄이고 동시에 이등변 삼각형 형상의 오리피스를 차압유지 밸브에 적용함으로써 요구 유량에 따라 유량이득이 조절되도록 하여 시스템의 안정성을 높일 수 있었다.

공기흡입식 추진기관용 연료조절밸브시스템 개발에 관한 연구 (A Study on the Development of Fuel Metering Unit for Air Breathing Engine)

  • 이도윤;최현영;박종승;구자용
    • 한국군사과학기술학회지
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    • 제8권4호
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    • pp.152-158
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    • 2005
  • In this paper, we have proposed a fuel metering unit of ai breathing engine. The proposed valve system consists of a constant pressure drop valve and a metering valve, which are controlled by servovalve. We carried out nonlinear and linear analysis, computer simulation and experimentation to find effects of some factors on system performance. Analysis and experimental results show a good agreement. It is also shown that the system stability is affected by pressure drop of metering valve and inlet pressure of injectors.

과하중 방지기의 전기체 구조시험 적용에 관한 연구

  • 김성찬;채동철;김성준;황인희
    • 항공우주기술
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    • 제2권2호
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    • pp.11-17
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    • 2003
  • 항공기 전기체 구조시험에 과하중 방지 밸브로 사용되는 미터-아웃방식의 유량제어 방법을 본 보고서로 소개하고자 한다. 전기체 구조시험에서는 여러 요인에 의해 비상시험 중지상태(덤프상태)가 발생하며, 이 상태가 되면 서보밸브의 전원이 차단되어 하중을 가하던 실린더의 양단에 외부조건에 따른 급격한 압력변화가 발생되고, 이 변화는 시험체에 과하중으로 가해진다. 본 연구에서는 덤프로 기인한 하중으로부터 시험체를 보호하기 위해 사용되는 오리피스 면적조절 기술에 대해 소개하였고 실제 시험에서 유압작동기의 덤프특성이 효과적으로 감소되고 있음을 확인하였다.

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미터링 오리피스 압력 진폭을 이용한 방향제어밸브 대역폭 주파수에 관한 연구 (A Study on the Bandwidth Frequency of Directional Control Valves based on the Amplitude of the Metering-Orifice Pressure)

  • 김성동;전세형;신대영
    • 드라이브 ㆍ 컨트롤
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    • 제14권2호
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    • pp.1-8
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    • 2017
  • The spool displacement of a directional control valve can be considered as the standard signal for the measurement of its bandwidth frequency. When the spool displacement is not available, the metering-orifice system is suggested in this study as an alternative way to measure the - 3 dB amplitude-ratio bandwidth frequency of the hydraulic directional-control valve. The amplitude ratio of the metering-orifice pressure can be adjusted to equal that of the spool displacement through the controlling of the metering-orifice opening area. A series of experiments were conducted to verify the effectiveness of the metering-orifice system. The metering orifice was confirmed as adequate for the measurement of the - 3 dB amplitude-ratio bandwidth frequency.

미터링 오리피스를 이용한 방향제어밸브 위상각 대역폭 주파수 측정에 관한 연구 (A Study on the Phase Bandwidth Frequency of a Directional Control Valve based on the Metering Orifice)

  • 김성동;전세형;윤주섭
    • 드라이브 ㆍ 컨트롤
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    • 제15권1호
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    • pp.1-9
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    • 2018
  • The spool displacement of directional control valve can be considered as the standard signal to measure the bandwidth frequency of a directional control valve. When the spool displacement is not available, the metering-orifice system is implemented in this research as an alternative way of measuring the 90 degrees phase bandwidth frequency of the hydraulic directional control valve. The inertia effect on the transmission line oil induces the phase lead of the valve load pressure when compared with the phase of spool displacement. The capacitance effect of the oil induces the phase lag of the valve load pressure. The phase of the load pressure can be adjusted to be the same as that of the spool displacement by controlling the opening area of the metering orifice. A series of experiments were conducted to verify the effectiveness of the metering orifice. The 90 degrees phase bandwidth frequency measured from the valve load pressure was significantly deviated in some cases from the frequency of the spool displacement. The metering orifice was hard to be applied to measure the -90 degrees phase bandwidth frequency of the high precision.

서보밸브-미터링 실린더 시스템의 오일 관성효과와 주파수 응답 특성에 관한 연구 (A Study on the Oil Inertia Effect and Frequency Response Characteristics of a Servo Valve-Metering Cylinder System)

  • 윤홍식;김성동
    • 드라이브 ㆍ 컨트롤
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    • 제18권2호
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    • pp.9-19
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    • 2021
  • The spool displacement signal of a directional control valve, including the servo valve, can be considered as the standard signal to measure dynamic characteristics. When the spool displacement signal is not available, the velocity signal of a metering cylinder piston can be used. In this study, the frequency response characteristics of the metering cylinder are investigated for the spool displacement input. The transfer functions of the servo valve-metering system are derived taking into consideration the oil inertia effect in the transmission lines. The theoretical results of the transfer functions are verified through computer simulations and experiments. The oil inertia effect in the transmission lines was found to have a very significant effect on the bandwidth frequency of the servo valve-metering cylinder system. In order to more precisely measure the dynamic characteristics of a servo valve, the metering cylinder should be set up to minimize the oil inertia effect by increasing the inner diameters of the transmission lines or shortening their lengths.

IMV 비례 유량제어밸브 정특성 선형해석 (Liner Analysis of IMV Proportional Flow Control Valve Static Characteristics)

  • 정규홍
    • 드라이브 ㆍ 컨트롤
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    • 제16권4호
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    • pp.56-64
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    • 2019
  • Recently, as the environmental regulation for earth moving equipment has been tightened, advanced systems using electronic control have been introduced for energy savings. An IMV(Independent Metering Valve), which consists of four 2-way valves, is one of the electro-hydraulic control systems that provides more flexible controllability and potential for energy savings in excavators, when compared to the conventional 4-way spool valve system. To fully realize an IMV, a two-stage bi-directional flow control valve which can regulate the large amount of flow in both directions, should be developed in advance. A simple design that allows proportional flow control to apply the pilot pressure from the current-controlled solenoid to the spring loaded flow control spool and thus valve displacement, is proportional to the solenoid current. However, this open-loop type valve is vulnerable to flow force which directly affects the valve displacement. Force feedback servo of which the position loop is closed by the feedback spring which interconnects the solenoid valve and flow control spool, could compensate for the flow force. In this study, linearity for the solenoid current input and robustness against load pressure disturbance is investigated by linear analysis of the static nonlinear equations for the IMV proportional flow control valve with feedback spring. Gains of the linear system confirm the performance improvement with the feedback spring design.