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외부 화물운송용 무인 헬리콥터 제어기 비행 안정성 인증기법 연구
백창훈,탁민제,이병윤,김윤영,김영원 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
본 논문은 최근 활용이 증대하고 있는 외부 화물수송용 무인헬리콥터의 비행안정성 인증기법에 대해 기술하였다. Newtonian 방식과 UKE 방식을 이용한 슬렁 로드 동역학 시스템과 공개되어 있는 Colibri 소형 싱글 로터 헬리콥터 모델을 결합하여 제어기 시스템을 구성하였으며, 이 제어기 시스템을 헬리콥터 비행성 기준서인 ADS-33E PRF 규정을 적용하여 분석하였다. 비행특성 평가를 위한 요구조건은 ADS-33E PRF 임무운용요소 중 제자리비행, 수평이동, 상승/강하 이며, 비행기동평가 예시를 테일러링하여 테스트 시나리오를 구성 후 시뮬레이션을 수행하였다. 그 결과 자체적으로 수립한 요구조건에 부합하였다. This paper describes the airworthiness certification of handling qualities scheme for the unmanned helicopter with externally slung load in recent years and the increasing utilization. Combining slung load dynamics using Newtonian method with UKE method and single-rotor helicopter model Colibri that has been published to configure the control system, the control system were analyzed by applying the standard of handling qualities for rotorcraft of ADS-33E PRF. The handling quality requirements for flight evaluation were hover, lateral reposition, vertical maneuver in ADS-33E PRF mission task elements, and carried out simulation after configuring the test scenario by tailored valuation illustrated. The result was consistent with the requirements established by itself.
백창훈(Changhoon Baek),서종모(Jong-Mo Seo) 대한검안학회 2016 Annals of optometry and contact lens Vol.15 No.4
Purpose: Design and build an affordable schematic eye using three-dimensional (3D) printer for retinoscopy training. Methods: The schematic eye is printed using a fused deposition modeling-based 3D printer. The total of seven parts are printed and assembled. Additional components consist of a paper cylinder, +10 diopter spherical lens, and a tripod. Results: The entire schematic eye can be created within an hour with a conventional 3D printer, and showed satisfactory function in the evaluation by the ophthalmology specialist. The optical error of the proposed schematic eye calculated by measuring printed model was less than 0.05 diopter. Conclusions: By using 3D printer, simple and inexpensive schematic eye for training of retinoscopy was built. This concept can be applied to the similar devices in medical education and practice.