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2 MW 영구자석 직접 구동형 부유식 스파 부이 풍력 발전기의 피칭 운동해석
신평호(Pyungho Shin),경남호(Namho Kyong),최정철(Jungchul Choi),고희상(Heesang Ko) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.1
A series of coupled time domain simulations considering stochastic waves and wind based on five 1-h time-domain analyses are performed in normal operating conditions. Power performance and tower base Fore-Aft bending moment and pitching motion response of the floating spar-buoy wind turbine with 2 MW direct-drive PMSG have been analyzed by using HAWC2 that account for aero-hydro-servo-elastic time domain simulations. When the floating spar-buoy wind turbine is tilted in the wind direction, maximum of platform pitching motion is close to 4°. Statistical characteristics of tower base Fore-Aft bending moment of floating spar-buoy wind turbine are compared to that of land-based wind turbine. Maximum of tower base Fore-Aft bending moment of floating spar-buoy wind turbine and land-based wind is 94,448 kNm, 40,560 kNm respectively. This results is due to changes in blade pitch angle resulting from relative motion between wave and movement of the floating spar-buoy wind turbine.
An Analysis of Shortened Experiments for Environmental Chamber
Sanghyun Choi,Cheolho Bai,Mo Chung,Namho Kyong,Hangsuk Suh 대한설비공학회 2001 International Journal Of Air-Conditioning and Refr Vol.9 No.3
Environmental chamber (EC) is an experimental facility used to analyze the characteristics of thermal response of testing objects by the artificial control of weather conditions. The EC in KIER can simulate the weather conditions by the control of temperature, humidity, and, solar radiation. A two-storied testing building is located inside EC. For the exact thermal response analysis of testing building, monthly or yearly scheduled operations are necessary. Although this long term operation gives the exact experimental data, it requires a high operational cost, long duration, and lots of manpower. Therefore it is necessary to perform the shortened experiments without sacrificing the validity of the obtained results. Since the characteristics of thermal response from the shortened experiments are different from the full time results, the analytical method to analyze the thermal response from the shortened experiments to estimate a full times results is developed in this study. The thermal response of testing building is performed using commercial software TRNSYS.
기능계통도를 활용한 분류식 하수관거의 자산관리 서비스수준의 성능측정방법 개선에 대한 연구
하승호(Ha Seung Ho),김석(Kim Seok),조남호(Cho Namho),김경주(Kim Kyong Ju) 대한토목학회 2012 대한토목학회논문집 D Vol.32 No.2D
최근까지 분류식 하수관거에 대한 서비스수준 평가지표 구축에 관한 연구들은 기능에 대한 고려가 없이 단순하게 사용자의 관점 및 재무/사회/환경적 관점에서 사위 개념의 서비스 수준을 도출하여 실제 유지관리 업무와의 연결성이 떨어지는 단점이 있었다. 본 연구에서는 기능 중심적인 서비스수준 평가항복의 도출을 위하여 가치공학(Value Engineering)에서 적용되는 기능분석 기법인 기능계통도(Function Analysis Systems Technique)활용하여 분류식 하수관거에 대한 분석을 수행하였다. 본 연구에서 제시한 부위별 평가항목은 하수관거의 기능을 모두 포괄하며, 기능을 중점적으로 유지·관리하는데 유리하다. 또한 이력관리에 용이하며, 구간별 개·보수 판단기준으로써 적용이 가능하여 자산관리를 효율적으로 수행할 수 있다는 장점을 지니고 있다. Recent studies on development of level of service(LoS) for separated sewer pipe have simply shown high-level of LoS from the perspective of users and financial/social/economical factors, which results in poor connectivity to real maintenance work. The objective of this study is to develop the evaluation indicators of level of service in the manner of function by analyzing the separated sewer pipes with FAST, function analysis systems technique, used in value engineering. The evaluation indicators suggested in this study include all the functions of separated sewer pipes and show an advantage of focused function maintenance. Moreover, developed indicators help to manage archival history and to perform asset management effectively.