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24GHz 도플러 레이더를 이용한 풍력 발전기 블레이드의 축소 모델에 대한 측정 및 분석
김용빈(Yong-Bin Kim),최영재(Young-Jae Choi),최인식(In-Sik Choi) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.6
In this paper, we performed the analysis and comparison between the simulation and measurement results to monitor the operation status of wind turbine blade for the scale model. To suppress the clutter noise at the measurement, the indoor measurement system is designed by using the microwave absorber and the obtained data is analyzed by the short time Fourier transform (STFT) which is the time-frequency analysis method. The Doppler frequencies of the blade tip were extracted from the produced spectrogram images and relative errors were calculated by comparing with their theoretical values. Experiment results show that the maximum Doppler frequencies and revolution rates extracted from the spectrogram images by the simulation and measurement are matched with the theoretical values very well within the maximum relative errors of 3.5%.
드라이빙핀이 노치를 갖는 강재의 인장특성에 미치는 영향
양일승(Yang IL-Seung),김순철(Kim Soon-Chul),김용빈(Kim Young-Bin),황성철(Hwang Sung-Chul),남상철(Nam Sang-Chul),양성준(Yang Sung-Jun),안현진(An Hyun-Jin) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Power actuated fasteners in sort of mechanical methods have appeared to be an alternative to metallurgical methods in the connection of a structural steel member and a thin steel plate. Power actuated fasteners can be driven by power actuated tools or by pneumatically driven tools. Tensile tests was conducted to investigate the effect of this mechanical method on the structural steel member. The main parameters are steel plate thickness, notch thickness, steel type, and damage types, that is, non-damage, drilled hole, and driving pin. This research supplies the fundamental data to the design criterion of this mechanical method by clarifying the influence of the mechanical method on the tensile property of the structural steel member. In a results, the strength and stiffness specimens using driving pin was raised but decreased deformation capacities and elongation.