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MAE2_Lecture9

MAE2_Lecture9 - Stability and Control I Definitions Static...

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Stability and Control I Definitions Static and Dynamic Stability Body Axis System Pitching Moment about CG Wing Contribution Tail Contribution MAE 2 F-8 DFBW (NASA Image)
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2 MAE 2 Stability and Control Definitions Stability considers how forces and moments must be balanced to maintain the desired flight path. The airplane is statically stable if the forces and moments created by an atmospheric disturbance tend to oppose the disturbance. An airplane is dynamically stable if it eventually returns to its original equilibrium state after a disturbance occurs. Control deals with changes to the airplane's configuration that alter the forces and moments acting on the airplane. Dynamically Stable Dynamically Unstable Time Time Response Response Disturbance Disturbance
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3 MAE 2 Body-Axis and Translational Velocity x-axis z-axis y-axis speed forward (U) speed down (W) speed side (V) The origin of the body-axis is located at the aircraft center-of-gravity (c.g.) V = U 2 V 2 W 2
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4 MAE 2
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