Appoximate Chattering Arc for Practical Maneuvers

淡江大學機構典藏 > 工學院 > 機械與機電工程學系暨研究所 > 會議論文 > Item 987654321/70669

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题名:	Appoximate Chattering Arc for Practical Maneuvers
作者:	Chern, J. S.;Hong, Z. C.
贡献者:	淡江大學機械與機電工程學系
日期:	1992-01
上传时间:	2011-10-23 21:39:51 (UTC+8)
摘要:	The purpose of this paper is to develop an approximate chattering arc for a minimum-time aerobraking maneuver for a shuttle-type space vehicle. Theoretically, in chattering arc of the first kind, the control chatters between its maximum and minimum values are at an infinite rate. As an example, for a flight at a constant altitude, the bank angle switches between its positive and negative maximum value arc at an infinite rate to generate maximum drag. The resulting flight path is along the arc of a great circle and is one-dimensional. We have a complete analytic solution for this theoretical chattering arc. In practical application, switching of the bank control at an infinite rate is not possible. An approximate chattering arc with the bank control switches only two times is then introduced. The resulting flight path is two-dimensional and there is a penalty of shorter longitudinal range. We now allow the vehicle to coast for a short distance and then change to approximate chattering arc. The the longitudinal range is satisfied and longer flight time (1.11% more) becomes the penalty. Further investigation is devoted to the approximate chattering arcs with 3, 4, and 5 times of bank control switchings, respectively. The penalty of longer flight time is minimized by increasing the number of control switchings and selecting the optimal time instants for the switchings.
關聯:	18th ICAS Congress,
显示于类别:	[機械與機電工程學系暨研究所] 會議論文

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