국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Optimal Control of Helicopters Following Power Failure
저자	Yoshinori OKUNO
Keyword	helicopter; optimal control; power failure; V/STOL
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr01190.pdf?id=NALTR0001190
보고서번호	NAL TR-1190
발행년도	1993.1
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	STOLt results showed that the pilots used monoptimal controls,especially in the timing and amplitude of the collective flare before touchdown. 2)Prediction of the height-velocity(H-V)boundaries.The optimization problems were formulated to minimize the unsafe region under the condition that the touchdown speed is within the landing gear capacity.The calculated H-V boundaries showed good correlation with the flight test results.In addition,parameters such as the flight-path-angle at the moment of power failure,collective control delay,collective setting during descent,landing site location and its available field length,and wind speed were found to have significant effects on the success of the emergency landing,although some of these effects are not currently taken into account during certification flight tests. 3)Optimization of the takeoff procedure for Category A STOL operation.The results show that the required takeoff distance using the normal takeoff procedure can be significantly reduced if the takeoff path and the critical decision point are specifically optimized for a given set of operating conditions,e.g.,gross weight,ambient conditions,and heliport configuration. 4)Evaluation of the take-off performance for Category A VTOL operation.The calculated maximum weight when assuming the normal takeoff procedure showed good agreement with the certificated takeoff weight.Additionally,optimization of the takeoff path was shown to allow the payload to be increased.