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박한영,김진영,안성수,강준희,Park, Han Young,Kim, Jin Young,Ahn, Sung Soo,Kang, Joonhee 대한전자공학회 2013 전자공학회논문지 Vol.50 No.11
To proportionally control the electronic valve position of the actuator, we designed and fabricated PCU, CPT, and rotary absolute optical encoder for the detection of absolute angular position in the actuator. We also designed and constructed the test system by using DAQ hardware and Labview. We designed PCU to convert 1-5 V, 0-5 V, 0-10 V, 2-10 V voltage signals and 4-20 mA current signals to the voltage signals in the common 0.5-2.5 V range. We designed CPT to output 4-20 mA current signals corresponding to the valve positions based on the PWM signal input from the MCU. We also designed 20 bit optical encoder by using infrared LED and infrared transistor and made the serial communication with the main board possible. When we tested PCU and CPT with DAQ hardware and Labview software, they operated correctly with the small errors within ${\pm}0.003$ V and ${\pm}0.01$ mA, respectively, showing that our actuator has the excellent performance to employ as the industrial proportional-valve-actuator. The resolution of the encoder was $11.25^{\circ}$ and the maximum revolution to detect was 32,768. 본 연구에서는 전기식 밸브 액추에이터의 개폐 정도를 입력신호에 비례하여 제어하기 위한 PCU (Proportional Control Unit), CPT (Current Position Transmitter)와 액추에이터의 회전위치를 측정하는 Rotary Absolute Optical Encoder를 설계 및 제작 하였고, DAQ 하드웨어와 LabView를 사용한 테스트 시스템을 설계하여 성능시험을 하였다. PCU는 1-5V, 0-5V, 0-10V, 2-10V 전압 신호와 4-20mA의 전류신호를 일정한 범위의 0.5-2.5V 전압신호로 변환하도록 설계하였다. CPT는 MCU의 PWM 신호를 입력받아 밸브의 개폐 정도를 4-20mA의 전류신호로 출력 하도록 하였다. Infrared LED와 Infrared Transistor를 사용하여 20bit Optical Encoder를 개발하였으며, Main Board와 Serial 통신을 하도록 설계하였다. DAQ 하드웨어와 Labview를 통한 테스트 결과 PCU는 ${\pm}0.003V$, CPT는 ${\pm}0.01mA$의 오차범위 내에서 작동하여 산업용 밸브 액추에이터가 안정적으로 작동하는 것을 관찰하였으며, Encoder는 $11.25^{\circ}$의 분해능을 갖고, 최대 32,768 회의 모터회전수 범위까지 측정할 수 있도록 하였다.
R134a 터보 냉동기용 2단 원심 압축기의 유동 특성에 관한 수치적 연구
박한영(Han Young Park),오현택(Hyun-Taek Oh),신유환(You Hwan Shin),이윤표(Yoon Pyo Lee),김광호(Kwang-Ho Kim),정진택(Jin Taek Cheong) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A turbo-chiller is used for air conditioning in large buildings and for temperature controlling in industrial facilities. A R134a substitutes the refrigerants in the turbo-chiller because of an environmental pollution and an ozone layer destruction problem. One of the most important components of a turbo-chiller is a centrifugal compressor with refrigerant. In this study, the flow structure in the two-stage centrifugal compressor with the refrigerant, R134a, was numerically investigated at the design point using a commercial code. Flow characteristics in blade spanwise and on meridional plane of impeller, diffuser and return channel passage were analyzed in detail including velocity vector, Mach number and pressure contours for each stage. Three-dimensional shape of the impeller blade and the meridional shape of the return channel are comparatively reasonable because no flow separation or recirculation occur in the flow passage. However, it is considered that the setting angle of the diffuser vane is necessary to be slightly adjusted because of high angle of attack. The results will be used as reference data for a new design of 3-D impeller shape to improve R134a compressor performance.
디퓨저 베인 설치각 변화에 따른 R134a 원심압축기 성능 분석
박한영(Han Young Park),신유환(You Hwan Shin),이윤표(Yoon Pyo Lee),김광호(Kwang Ho Kim),정진택(Jin Taek Chung),조용훈(Yong Hun Cho),김종성(Jong-Seong Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Numerical simulation on the two-stage centrifugal compressor with Low Solidity Vaned Diffuser LSVD) for HFC-134a Turbo-chiller was performed using a commercial code. The comparative study with experimental results from other compressor was also investigated to testify the simulation schemes. The numerical analysis was separately simulated for each stage of the compressor and the effect of impeller-diffuser flow interaction was considered. Setting angle of the diffuser vane changed in the range of 15 deg. and the effects on its variation were discussed in detail including the flow analysis in the passage of the compressor. The vane setting angle obtained from the preliminary design was slightly adjusted to the optimal value by the performance enhancement in terms of pressure recovery and flow characteristics.
R134a 터보 냉동기용 2단 원심 압축기의 수치해석 기법과 내부유동 특성
박한영(Han Young Park),오현택(Hyun-Taek Oh),신유환(You Hwan Shin),이윤표(Yoon Pyo Lee),김광호(Kwang Ho Kim),정진택(Jin Taek Chung) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, some points to be numerically considered were examined and the flow structure in the two-stage centrifugal compressor with the refrigerant, R134a, was numerically investigated at compressor design point using commercial code. Flow characteristics in blade spanwise and meridional plane of impeller, diffuser and return channel passage were analyzed in detail including velocity vector, secondary flow, Mach number and pressure contours for each stage. Three-dimensional shape of the impeller blade and the meridional shape of the return channel are comparatively reasonable because of no flow separation or recirculation in flow passage. The results will be used as reference data for a new design of 3-D impeller shape to improve R134a compressor performance.