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김석현(Kim Seockhyun),백인수(Paek Insu),김재철(Kim Jaecheol) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper investigates the sound insulation performance of the fiber sandwich panels for a tilting train. Due to the high strength and low mass, fiber sandwich panels are widely used for aircraft structures, railway vehicle structures. These fiber sandwich panels show orthotropic behavior because of the fiber"s structural characteristics. This orthotropy often reduces the critical frequency and makes negative effect on the sound insulation performance. In this study, transmission loss of the fiber panels is analyzed based on the equivalent orthotropic plate model. An analysis program is developed to calculate the transmission loss of the fiber sandwich panels. Using the program, the coincidence frequency ranges and their effects on the transmission loss are investigated.
상용 CFD 프로그램을 이용한 풍력터빈 축소모델 출력계수 검증 및 후류 해석
김병수(Kim Byoungsu),백인수(Paek Insu),유능수(Yoo Neungsoo) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
A numerical simulation on the wake flow of a wind turbine which is a scaled version of a multi-megawatt wind turbine has been performed. Two different inlet conditions of averaged wind speed including one below and one above the rated wind speed were used in the simulation. Steady-state pitch angles of the blade associated with the two averaged wind speeds were imposed for the simulation. The steady state analysis based on the Reynolds averaged Navier-Stokes equations with the method of frame motion were used for the simulation to find the torque of the rotor and the wake field behind the wind turbine. The simulation results were compared with the results obtained from the wind tunnel testing. From comparisons, it was found that the simulation results on the turbine power are pretty close to the experimental values. Also, the wake results were relatively close to the experimental results but there existed some discrepancy in the shape of velocity deficit. The reason for the discrepancy is considered due to the steady state solution with the frame motion method used in the simulation. However, the method is considered useful for solutions with much reduced calculation time and reasonably good accuracy compared to the transient analysis.
소형 풍력발전기 날개 모니터링을 위한 FBG 변형률 센서의 적용
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Arrays of Fiber Bragg Grating (FBG) sensors and strain gauges were used to extract deflection mode shapes of a small wind turbine blade made from fiber reinforced plastic (FRP). A cantilever system developed for this study was employed to fix the blade at the root. Impact Responses of the blade using the sensors attached from the top and bottom surfaces of the blade were measured. The fundamental frequencies and higher modes of the blade cantilever system obtained from both sensors were almost identical. Deflection mode shapes were estimated from the strain modes. The mode shapes were close but slightly different from each other. The differences are considered due to the fact that the top and bottom sections where the sensors were attached are Non-symmetric.
WAsP과 WindSim을 이용한 복잡지형에서의 풍속 예측
우재균(Jaekyoon Woo),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Comparison of wind speed predictions from WAsP and WindSIM was made. Three sites located in complex terrain were analyzed in this study. Three meteorological masts were installed at the sites and used to measure wind speed and direction for one year. The measured data were used for cross predictions of annual wind speeds for two separate cases including two measurement sites. The WAsP predictions were even more accurate than those from WindSIM for some cases but they were much worse for others. The results from WindSIM showed higher consistency than WAsP and the WindSIM prediction errors were less than 10% for all the cases in this study.