국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	The effect of time lag on the stability of HOPE model in a Dynamic Wind Tunnel Test
저자	Toshikazu MOTODA, Shuichi SASA, Masaaki YANAGIHARA, Taro TSUKAMOTO
Keyword	Nyquist diagram; time lag; simulation
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr01265.pdf?id=NALTR0001265
보고서번호	NAL TR-1265
발행년도	1995.4
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	conducted in 1992.In one experiment,the motion of the model plane became unstable when the elevon deflected suddenly and enormously.The mode change from altitude control to attitude control caused serious elevon deflection,but the attitude control system was theoretically stable and still worked at that time.The problem is that the unstable motion happened in spite of the theoretical expectation of stable model motion.The effect of time lag of the contol system on the stability of the HOPE model was investigated using a Nyquist diagram and computer sumulation.The aerodynamic data of the static wind tunnel test was used for these analyses.The time lag required to make the motion unstable was derived from the Nyquist diagram,and the results were confirmed by numerical simulation based on a linear motion equiation.Also,non-linear simulation showed that the stability of the system is affected by non-linear charcteristics of the model plane.