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채상현(Sanghyun Chae),백선우(Sunwoo Baek),이상일(Sangil Lee),김태우(Taewoo Kim),이준배(Junbae Lee),이관중(Kwanjung Yee),오세종(Sejong Oh) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.10
본 연구는 실내 정찰 임무에 적합한 동축반전형 MAV 개발하는 것을 목표로 하였다. 현재 개발된 유사기종의 제품을 참조하여 초기사이정을 실시하고 BEMT기법을 이용하여 로터성능을 해석하였다. 또한 로터성능을 측정할 수 있는 실험장비를 구성하였다. 시제기의 진동발생 및 비행 불안정 문제는 NC머신을 이용해 부품을 정밀제작하고 스테빌라이져, 시소형태의 로터를 도입하여 해결하였다. 본 연구를 통하여 영상장비를 장착하고 비행가능한 기체를 제작하는데 성공하였으나, 향후 성능향상을 위한 별도의 로터설계가 필요한 것으로 보인다. The objective of this research was to develop a coaxial rotor MAV which is suitable for a indoor reconnaissance mission. Preliminary design parameters were determined, based on the dimensions of other reference MAVs. The designed rotor performance was estimated by Blade Element Momentum Theory, and the analyses were compared against the measurements. Stability and vibration issues of the prototype were circumvented by making parts of vehicle with NC machine, as well as equipped with teetering rotor and stabilizer. The designed coaxial rotor MAV showed successfully flight equipped with video camera. However, it was founded that further research activities should be focused on efficient rotor design to obtain better performance.
헬리콥터의 고속충격소음 감소를 위한 블레이드 평면형상 최적화
채상현(Sanghyun Chae),양충모(Chooongmo Yang),정신규(Shinkyu Jung),Takashi Aoyama,Shigeru Obayashi,이관중(Kwanjung Yee) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.1
The objective of this research is to design blade planform to reduce high speed impulsive(HSI) noise from a non-lifting helicopter rotor using CFD method and optimization techniques. As for the aero-acoustic analysis. CFD technique for aerodynamic analysis and Kirchhoff's method for the acoustic analysis were used. As for the optimization method, Kriging-based genetic algorithm(GA) model as a high-fidelity optimization method was chosen. Design variables and constraints are determined for arbitrary blade planform. The result shows that the optimized blade platform with high swept-back and taper ratio can reduce HSI noise by suppressing generation of the strong shock wave on blade surface and propagation of the noise to the farfield flow region.