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Upwind형 수평축 풍력발전기의 타워 영향에 의한 블레이드 공력 성능 및 하중 변화에 대한 고찰
김호건(Kim, Ho-Geon),신형기(Shin, Hyung-Ki),박지웅(Park, Ji-Woong),이수갑(Lee, Soo-Gab) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
This paper describes the effects to wind turbine blade aerodynamics due to interaction between blade and tower on upwind type HAWT. In order to analyze effects of blade-tower interact ion, the analyst s program WINFAS which is based on VLM(Vortex Lattice Method), Free wake and FVE model is used. In this study, the changes of wind turbine blade aerodynamics caused by blade-tower interact ion are Investigated with various parameters windshear, yaw error, TSR and tower diameter.
비선형 구속 와류 보정법을 이용한 수평축 풍력 발전기의 공력 해석
김호건(Kim, Ho-Geon),이승민(Lee, Seung-Min),이수갑(Lee, Soo-Gab) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Nonlinear Vortex Strength Correction Method is developed for improvement of vortex lattice method which can't calculate the separated flow conditions and the viscous effect. In this method, the vortex strength on the blade surface is determined by matching the lift force from vortex lattice method with the lift force from aerodynamic coefficients table as the same circulation is added to or subtracted from all chord wise vortices. For considering the nonlinearities due to the neighboring blade sections, sophisticated Newton-Rapson algorithm is applied. The validation of this method was done by comparing the simulations with the measurements on the NREL Phase-VI horizontal axis wind turbine(HAWT) in the NASA Ames wind tunnel under uniform conditions. This method gives good agreements with experiments in most cases.
동기식 전송망을 위한 디지틀 회선 분기/분배 기술 고찰
염흥렬,김호건,김홍주,Yeom, Heung-Ryeol,Kim, Ho-Geon,Kim, Hong-Ju 한국전자통신연구원 1989 전자통신 Vol.11 No.2
본고에서는 융통성있고 경제적인 디지틀 통신망 구성에 필수적으로 소요되는 망노드에서의 디지틀 다중 및 회선 분기/분배 기술에 대하여 살펴보고 미래의 동기식 전송망에서 핵심이 될 광대역 회선 분기/분배 기술을 실현하기 위한 장치의 구성 방안, 동기 방식, 소요 기능 요구사항, 그리고 응용영역에 대해 고찰하였다.
진성언,김호건,김원호,이창기,고제수,Jin, Seong-Eon,Kim, Ho-Geon,Kim, Won-Ho,Lee, Chang-Gi,Go, Je-Su 한국전자통신연구원 1992 전자통신 Vol.14 No.2
기존 비동기식 디지틀 신호(DS1. DS3) 를 동기식 디지틀 계위 (SDH) 신호로 다중하기 위해서는 동기식 다중기술이 요구되며 이에 포함되는 주된 기술로는 신호사상, 오버헤드 처리 및 포인터 처리기술이 있다. 또한 동기식 다중 시스팀의 안정적인 동작과 효율적인 운용을 위해 유지보수 기능이 필수적이다. 본 논문에서는 이러한 동기식 다중에 요구되는 핵심 기술을 구현 측면에서 분석하고, 실제 구현한 동기식 다중 시스팀에 대해 기술한다.
Design of Low Noise Airfoil for Use on Small Wind Turbines
김태형(Kim, Tae-Hyung),이승민(Lee, Seung-Min),김호건(Kim, Ho-Geon),이수갑(Lee, Soo-Gab) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Wind power is one of the most reliable renewable energy sources and the installed wind turbine capacities are increasing radically every year. Although wind power has been favored by the public in general, the problem with the impact of wind turbine noise on people living in the vicinity of the turbines has been increased. Low noise wind turbine design is becoming more important as noise is spreading more adverse effect of wind turbine to public. This paper demonstrates the design of 10 kW class wind turbines, each of three blades, a rotor diameter 6.4m, a rated rotating speed 200 rpm and a rated wind speed 10 m/s. The optimized airfoil is dedicated for the 75% spanwise position because the dominant source of a wind turbine blade has been known as trailing edge noise from the outer 25% of the blade. Numerical computations are performed for incompressible flow and for Mach number at 0.145 and for Reynolds numbers at 1.02{times}10<sup>6</sup> with a lift performance, which is resistant to surface contamination and turbulence intensity. The objective in the low design process is to reduce noise emission, while sustaining high aerodynamic efficiency. Dominant broadband noise sources are predicted by semi-empirical formulas composed of the groundwork by Brooks et al. and Lowson associated with typical wind turbine operation conditions. During the airfoil redesign process, the aerodynamic performance is analyzed to minimize the wind turbine power loss. The results obtained from the design process show that the design method is capable of designing airfoils with reduced noise using a commercial 10 kW class wind turbine blade airfoil as a basis. The new optimized airfoil clearly indicates reduction of total SPL about 3 dB and higher aerodynamic performance.
박지웅(Park, Ji-Woong),김호건(Kim, Ho-Geon),신형기(Shin, Hyung-Ki),이수갑(Lee, Soo-Gab) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
To generate electricity from wind energy, wind turbine generally has a rotor blade. Since this rotor blade is a kind of the rotating machinery, the wake from the rotor is very Important role in the side of the aerodynamic performances. Thus the study about wake is essential to analyze wind turbine aerodynamics. In this study wake characteristics are analyzed by hot-wire probe in the K.A.F.A(Korea Air Force Academy) wind tunnel. It is possible to analyze the wake characteristics by hot-wire probe from acquiring the velocity fluctuations at given positions in the flow. This velocity data are arranged by trigger signal at same azimuth of the blade in periodic manner of the rotor blade. From this various wake characteristics are found : radial and axial position of the tip vortex, vortex core characteristics in the flow etc.
고속 회전 풍력 시스템의 로터 설계 인자에 따른 공력 소음 해석 연구
이승민(Lee, Seung-Min),김호건(Kim, Ho-Geon),손은국(Son, Eun-Kuk),이수갑(Lee, Soo-Gab) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
This study describes aerodynamic noise of high speed wind turbine system, which is invented as a new concept in order to reduce the torque of main shaft, for design parameters of the rotor blade. For parametric study of high speed rotor aerodynamic noise, Unsteady Vortex Lattice Method with Nonlinear Vortex Correction Method is used for analysis of wind turbine blade aerodynamic and Farassat1A and Semi-Empirical are used for low frequency noise and airfoil self noise. Parameters are chord length, twist and rotational speed for this parametric research. In the low frequency range, the change of noise is predicted the same level as each parameters varies. However, in case of broadband noise of blade, the change of rotational speed makes more variation of noise than other parameters. When the geometric angles of attack are fixed, as the rotational speed is increased by 5RPM, the noise level is increased by 4dB.
오성훈(Sung-Hoon Oh),김호건(Ho-Geon Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.4
The purpose of this study is to investigate cutting characteristics and wear behavior in FCD500 ductile cast iron turning with different cutting tools, tungsten-carbide and CBN. Mechanical property, cutting characteristics and the application to the real industrial area is the final purpose. FDC500 ductile cast iron is now widely used in the various commercial vehicle parts for increased machine abilities which accrue more tensile strength with lower hardness. Several studies have been fulfilled for the material and heat-treatment area, but few with the cutting characteristics and wear behavior in the turning area.
신형기(Shin, Hyung-Ki),박지웅(Park, Ji-Woong),김호건(Kim, Ho-Geon),이수갑(Lee, Soo-Gab),김석우(Kim, Seok-Woo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
BEMT나 wake method와 같이 2-D 에어포일의 데이터를 성능과 하중 해석에 이용하는 기법의 경우 에어포일 데이터의 정확도는 전체 결과에 큰 영향을 미친다. 풍력 블레이드와 같은 회정익에서는 2-D 에어포일 데이터를 실험 등을 통하여 정확히 얻어서 적용 시키더라도 예측 결과는 실제값과 큰 차이를 보이는 경우가 많다. 이는 회전익의 유동 특성에 의해 발생하는 실속 지연의 효과로 인한 것이며 이것은 입력에 사용되는 에어포일 데이터에는 반영되지 않으므로 자체적인 보정이 필요하다. 본 연구에서는 이러한 문제를 해결하기 위해 현재 제시되어 있는 실속 지연 모델을 살펴보고 이를 불레이드의 성능과 하중 해석에 저용시켜 보아 그 유효성에 대하여 살펴보았다.