Control Of Airship Motion In The Presence Of Wind

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Control Of Airship Motion In The Presence Of Wind

Show simple item record Nakpiam, Jatuporn en_US 2012-07-25T19:09:26Z 2012-07-25T19:09:26Z 2012-07-25 January 2011 en_US
dc.identifier.other DISS-11565 en_US
dc.description.abstract This research effort develops a guidance and control system for a small airship to fly through assigned waypoints in the three dimensional space with a desired speed in the presence of wind and wind gust. In the control system development and validation, a simulation environment based on the nonlinear 6-DOF model of an airship, including the effect of the wind, is used. The airship has five control variables, the main thrust, the main thrust angle, the tail thrust, elevator and rudder deflections. The effectiveness of the elevator and rudder degrades as the speed of the airship decreases. The controller design is based on MIMO (Multi-Input Multi-Output) LQR (Linear Quadratic Regulator) method. A gain scheduling scheme is used to cover multiple operating conditions based on the forward speed. An extensive nominal condition analysis is performed to understand the variation of the nominal values of the state and control variables with the change in speed. This enabled a better choice of the nominal conditions used in the gain scheduling controller. The simulation experiments show that the airship can fly through the assigned waypoints, even when the waypoints are at different altitudes, when the commanded speed is constant. Alternatively, the way-point navigation can be achieved while commanded speed is changed if the commanded altitude is kept constant. The simulations show that altitude and the speed changes cannot be commanded simultaneously if the changes are large. en_US
dc.description.sponsorship Dogan, Atilla en_US
dc.language.iso en en_US
dc.publisher Aerospace Engineering en_US
dc.title Control Of Airship Motion In The Presence Of Wind en_US
dc.type M.S. en_US
dc.contributor.committeeChair Dogan, Atilla en_US Aerospace Engineering en_US Aerospace Engineering en_US University of Texas at Arlington en_US masters en_US M.S. en_US

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