Aircraft control for flight in an uncertain environment: Takeoff in windshear |
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Authors: | G. Leitmann S. Pandey |
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Affiliation: | (1) College of Engineering, University of California, Berkeley, California;(2) Department of Mechanical Engineering, University of California, Berkeley, California |
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Abstract: | The design of the control of an aircraft encountering windshear after takeoff is treated as a problem of stabilizing the climb rate about a desired value of the climb rate. The resulting controller is a feedback one utilizing only climb rate information. Its robustness vis-a-vis windshear structure and intensity is illustrated via simulations employing four different windshear models.Notations ARL aircraft reference line - D drag force, lb - g gravitational force per unit mass=const, ft sec–2 - h vertical coordinate of aircraft center of mass (altitude), ft - L lift force, lb - m aircraft mass=const, lb ft–1 sec2 - O mass center of aircraft - S reference surface, ft2 - t time, sec - T thrust force, lb - V aircraft speed relative to wind-based reference frame, ft sec–1 - Ve aircraft speed relative to ground, ft sec–1 - Wx horizontal component of wind velocity, ft sec–1 - Wh vertical component of wind velocity, ft sec–1 - x horizontal coordinate of aircraft center of mass, ft - relative angle of attack, rad - relative path inclination, rad - e path inclination, rad - thrust inclination, rad - air density=const, lb ft2 sec2Dot denotes time derivative. |
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Keywords: | Aircraft guidance takeoff in windshear control of uncertain systems |
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