공압구동용 솔레노이드밸브의 동특성 해석

장제선(Jesun Jang),김병훈(Byunghun Kim),한상엽(Sangyeop Han) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11

우주발사체 추진기관 공급계에서 공압구동용 솔레노이드밸브는 제어시시템의 명령이 주어지면 구동가스 배관의 통로를 개폐해서 공압제어장치를 작동시킨다. 공압구동용 솔레노이드밸브의 제작에 앞서 설계검증 및 기본적인 작동특성을 분석하기 위해 AMESim 상용코드를 이용하여 해석모델을 수립하였다. 입구압력에 따른 작동시간을 시험결과와 비교하여 모델을 검증하였고 내부유동 해석결과(FLUENT)를 이용하여 3차원 형상을 고려하여 모델의 정확도를 높였다. 밸브모델을 이용하여 다양한 설계변수에 따른 밸브의 개폐압력, 작동시간을 계산하여 설계인자 검증 및 작동성능을 분석하였다. 설계변수인 컨트롤밸브의 시트 형상, 주 밸브와 배출밸브의 시트 형상, 실링 직경비, 컨트롤 캐비티 부피에 대해 밸브의 동특성 해석을 수행하였다. 해석을 통해 밸브 개폐작동시간, 작동성능, 개방압력을 예상하였다. 본 연구 결과는 한국형발사체 공급계 공압구동용 솔레노이드밸브의 설계/해석능력을 확보하고 밸브의 개발과정에서 효율성을 높일 수 있으며 파생형 밸브의 설계 및 선행연구에 적용할 수 있을 것으로 판단된다. A pneumatic driving solenoid valve operates pneumatic control devices by opening/closing operating flow passage when the command is given by control system for the liquid-propellant feeding system of space launch vehicle. The simulation model of pneumatic driving solenoid valve is designed with AMESim to verify the designs and evaluate the dynamic characteristics and pneumatic behaviors of valve. To validate a valve simulation model, the simulation results of their operating durations of valve by AMESim analysis are compared with the results of experiments. In addition, the results of internal flow simulation with FLUENT are utilized to improve the accuracy of valve-modeling. Using the model, we analyze performance of valve; opening/closing pressure, operating time on various design factors; shape of control valve seat, drainage seat, rate of sealing diameter, volume of control cavity. This study will serve as one of reference guides to enhance the developmental efficiency of ventilation-relief valves with the various operating conditions, which shall be used in Korea Space Launch Vehicle-Ⅱ.

공압실린더의 위치제어

서정덕(Jung-Duk Seo),이성구(Seong-Ku Lee),김건회(Gun-hoi Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-

The hydraulic/pneumatic pressure products are applied widely in current industrial area such as in the automation of products assembly, automation of equipment assembly, high-tech machine tool, aircraft, and train, and as the industry development is on progress, the development of the hydraulic/pneumatic pressure products is necessary and it is required in every industrial area. This research developed a position control system of the pneumatic cylinder using a pneumatic cylinder, four two-port valves, two three-port valves, two pressure valve, a check valve, two proximity sensors, and a program logic controller (PLC) to minimize the allowable error on the position control of pneumatic cylinder system and to develop a pneumatic cylinder valve system for further study. The maximum air pressure used for the position control test was 5 ㎏/cm2 and the displacement accuracy of the pneumatic cylinder was measured using a dial gauge. The supply and discharge air pressure and the length of the stroke of the pneumatic cylinder were controlled and set before experiment. The test of the position control of the pneumatic cylinder was carried out 50 times and replicated three times at each condition of the supply and discharge air pressure (2.5/3.5, 3.0/4.0, 3.5/4.5, and 4.0/5.0 ㎏/cm2) and selected stroke length of the pneumatic cylinder. The accuracy of the position control of the pneumatic cylinder increased as the supply and discharge air pressure increased at the stroke length was fixed as 133 ㎜, and increased as the stroke length increased with the fixed supply and discharge air pressure of 3.5/4.5 ㎏/cm2 of the pneumatic cylinder. The most accurate position control of the pneumatic cylinder (i.e., standard deviation of 0.01 ㎜) was obtained at the supply and discharge air pressure of 4.0/5.0 ㎏/cm2 and the stroke length of 170 and 190 ㎜.

한국형발사체 공압밸브 구동용 솔레노이드 밸브 성능시험

김병훈(Byung Hun Kim) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11

액체로켓시스템은 지상 운용 및 발사 과정에서 추진제 또는 각종 가스의 공급 배출을 위해 많은 공압밸브를 사용한다. 공압밸브는 밸브 구동부에 헬륨 가스를 공급 또는 배출함으로써 밸브를 작동한다. 밸브 구동부에 헬륨가스를 공급 배출하기 위해 3방향 솔레노이드 밸브를 개발하였다. 시험 결과 솔레노이드 밸브는 성능 요구조건을 만족함을 보여준다. The liquid propellant rocket system uses a lot of pneumatic valves for controling fluid flow during ground operation and launch process. The pneumatic valve is operated by suppling/draining helium gas to the valve actuating part. The 3way solenoid valve is developed for on/off control of pneumatic valve. We have performed various performance tests on 3way solenoid valve. Test results showed that the solenoid valve meets the performance requirements.

추진제탱크 가압용 솔레노이드밸브의 작동특성 분석 및 해석

장제선(Jesun Jang),김병훈(Byunghun Kim),한상엽(Sangyeop Han) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11

우주발사체 추진기관 공급계에서 2-way 솔레노이드밸브는 제어시스템의 명령에 의해 추진제 탱크를 가압하여 탱크내의 압력을 조절한다. 가압용 솔레노이드밸브의 제작에 앞서 설계검증 및 기본적인 작동특성을 분석하기 위해 AMESim상용코드를 이용하여 해석모델을 수립하였다. 입구압력에 따른 작동시간을 시험결과와 비교하여 모델을 검증하였다. 솔레노이드밸브 모델을 이용하여 설계변수인 컨트롤 밸브의 시트 직경, 주 밸브의 시트 직경, 실링 직경 비에 대해 밸브의 동특성 해석을 수행하였다. 해석을 통해 밸브의 개폐작동시간, 작동성능, 개폐압력을 예상하였다. 본 연구 결과는 한국형 발사체 공급계 가압용 솔레노이드밸브의 설계/해석능력을 확보하고 밸브의 개발과정에서 효율성을 높일 수 있으며 파생형 밸브의 설계 및 선행연구에 적용할 수 있을 것으로 판단된다. A 2-way solenoid valve regulates to maintain the pressure of ullage volume of propellant tanks when the command is given by control system for the liquid-propellant feeding system of space launch vehicle. The simulation model of solenoid valve for pressurization is designed with AMESim to verify the designs and evaluate the dynamic characteristics and pneumatic behaviors of valve. To validate a valve simulation model, the simulation results of their operating durations of valve by AMESim analysis are compared with the results of experiments. Using the model, we analyze performance of valve; opening/closing pressure, operating time on various design factors; shape of control valve seat, basic valve seat, rate of sealing diameter. This study will serve as one of reference guides to enhance the developmental efficiency of ventilation-relief valves with the various operating conditions, which shall be used in Korea Space Launch Vehicle-Ⅱ.

산화제 벤트/릴리프밸브의 동특성 해석 및 작동성능분석

장제선(Je-sun Jang),고현석(Hyeonseok Koh),한상엽(SangYeop Han),이경원(Kyung-Won Lee) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11

발사체의 추진공급시스템에 사용되는 벤트/릴리프밸브는 안전밸브의 조합체로 극저온의 산화제를 주입할 때와 비행 중에 기화된 산소기체를 배출시킨다. 벤트/릴리프밸브의 설계검증을 위해 AMESim과 FLUENT 상용코드를 이용하여 밸브모델을 구성하였다. AMESim 밸브모델을 검증하기 위해 밸브의 개폐압력, 개폐작동시간을 수학적 계산결과와 비교하였고 내부유동해석 결과를 반영하여 모델의 정확도를 높였다. 본 연구에서는 설계인자를 검증 및 작동성능을 분석하였다. 이 결과는 한국형 발사체에 사용되는 다양한 규격의 벤트/릴리프밸브 개발과정의 효율성을 높일 수 있을 것으로 판단된다. 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.

오리피스를 이용한 발사체용 공압밸브 개폐속도 조절

고현석(Hyeonseok Koh) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12

발사체 공압밸브의 경우 밸브 개폐 시 유로의 급격한 압력 증가의 위험을 방지하기 위하여 개폐속도를 조절할 필요가 있다. 공압 구동라인에 오리피스를 설치하여 밸브구동압의 증가속도를 변화시킬 경우 밸브 개폐속도를 조절할 수 있다. 오리피스 직경 0.4, 0.6, 0.8 mm에 대하여 공압밸브의 개폐속도를 측정하였다. 공압밸브의 열림 시간과 닫힘 시간을 각각 0.1 s와 4 s 이하로 조정할 수 있었다. In case of pneumatic valves for launch vehicle, the velocity of opening and closing should be controlled in order to prevent against rapid pressure increase in flow line at either valve opening or closing. The velocity of valve opening and closing can be controlled by changing the velocity of valve operation pressure increment with the orifice in the pilot line. We have measured the opening and closing velocity of pneumatic valve with respect to variable orifice diameters, such as 0.4, 0.6, and 0.8 mm. We could adjust the opening and closing time of pneumatic valve below 0.1 s and 4 s, respectively.

압전식 공압밸브의 내구 특성

윤소남(So-Nam Yun),정황훈(Hwang-Hun Jeong),박중호(Jung-Ho Park),정은아(Eun-A Jeong),김홍희(Hong-Hee Kim),장성철(Seong-Chul Jang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

In this paper, pneumatic valve which consists of valve body, valve controller, nozzle and a multi-bender PZT actuator was suggested and fabricated. The fabricated pneumatic valve was experimented for performance evaluation. From the experimental results, we know that the flow rate of the suggested valve is 23[lpm] at the pressure difference of 1[bar] and the maximum flow rate is 30[lpm] at the pressure difference of 4[bar]. The flow rates after endurance test of 9.8 million were 22.57[lpm] and 28.62[lpm] at the pressure difference of 1[bar] and [4bar], respectably. Finally, we can expect that the B₁? life of the suggested pneumatic valve is over 50 million.

Displacement Control of Pneumatic Actuator Equipped with PLC and Proximity Sensors

Jung Duck So(서정덕) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.2

A pneumatic system was proposed to evaluate displacement accuracy of the pneumatic actuator without external load and to analyze capability of integration of the proposed valve system. The proposed pneumatic system consisted of a combination of pneumatic valves, two proximity sensors, and a programmable logic controller(PLC). The position controller is based on the PLC controller connected with the proximity sensors. Displacement accuracy of the pneumatic cylinder stroke was tested by varying air pressures of the supply and discharge-side and strokes of the pneumatic cylinder. The displacement accuracy of the pneumatic cylinder stroke increased as the supply and discharge side of air pressure increased at the stroke length of 133㎜. Also the displacement accuracy increased as the stroke length increased with a fixed supply and discharge side of air pressure of the pneumatic cylinder as 3.5 and 4.5㎏/㎠, respectively. The most accurate displacement of the pneumatic cylinder(i.e., standard deviation of 0.01㎜) was obtained at the supply and discharge side of air pressure of 4.0 and 5.0㎏/㎠, respectively, and strokes of 170 and 190 ㎜ among arbitrarily selected supply and discharge side air pressures and strokes.

Displacement Control of Pneumatic Actuator Equipped with PLC and Proximity Sensors

서정덕 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.2

A pneumatic system was proposed to evaluate displacement accuracy of the pneumatic actuator without external load and to analyze capability of integration of the proposed valve system. The proposed pneumatic system consisted of a combination of pneumatic valves, two proximity sensors, and a programmable logic controller(PLC). The position controller is based on the PLC controller connected with the proximity sensors. Displacement accuracy of the pneumatic cylinder stroke was tested by varying air pressures of the supply and discharge-side and strokes of the pneumatic cylinder. The displacement accuracy of the pneumatic cylinder stroke increased as the supply and discharge side of air pressure increased at the stroke length of 133mm. Also the displacement accuracy increased as the stroke length increased with a fixed supply and discharge side of air pressure of the pneumatic cylinder as 3.5 and 4.5kg/cm2, respectively. The most accurate displacement of the pneumatic cylinder(i.e., standard deviation of 0.01mm) was obtained at the supply and discharge side of air pressure of 4.0 and 5.0kg/cm2, respectively, and strokes of 170 and 190 mm among arbitrarily selected supply and discharge side air pressures and strokes.

절충의사결정방법을 이용한 선박용 3/2WAY 공압밸브의 다목적 최적설계

김준오(Jun-Oh Kim),백석흠(Seok-Heum Baek),김태우(Tae-Woo Kim),강상모(Sangmo Kang) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.2

A study on the flow-structure characteristics of marine 3/2WAY pneumatic valve is essential for optimizing the performance of ship engines. It is important that the valve has desirable safety factor and reduced weight from safety and economic point of view. In this paper, flow-structure characteristics of pneumatic valve is obtained by being optimized based on the proper design criteria. The air with the pressure of 30 bar is the working fluid which is made to fill in the tack in short time. This time is defined as the filling time. On optimum design by considering the flow-structure characteristics, the approach is based on (1) the mathematical formulation of design decisions using the compromise decision-making method, and (2) the approximation technique of response surfaces. The methodology is demonstrated as the multi-objective optimization tool to improve the performance of marine 3/2WAY pneumatic valve.