17 Nov 3 - Stability and Control

17 Nov 3 - Stability and Control - AOE 2104-Aerospace and...

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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style AOE 2104 Introduction to Aerospace Engineering Lecture 9 Stability and Control
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Stability and Control Stability Control Dynamic Static Longitudinal Lateral Directional Criteria Adverse Roll Adverse Yaw Coordinate Systems Control Surfaces Coordinated Turn
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Aircraft Control
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Coordinate Systems The movement of the center of mass can be in three directions: x, y, or z. These directions can either be related to the body of the airplane (body axis system) or to the relative wind (wind axis system) . Control perspective – body axis system
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Aerodynamic perspective – wind axis system Note: Neither of the above mentioned axis systems are necessary perpendicular or parallel to the ground.
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Degrees of freedom (motion) Six degrees of freedom q Axial  q Normal  q Transverse q Roll q Pitch q Yaw
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Aircraft Control – Roll, Pitch, and Yaw Axial: A Normal: N Side: Y Roll: L Pitch: M Yaw: N Nomenclature !
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Aircraft Control – Aft, Port, Starboard, Fore Often in Stability and Control, people refer to front, rear, left and right as port, fore, aft, and starboard. Front = Fore Rear = Aft Right = Starboard Left = Port
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Aircraft Control – Control Surfaces How do you control or induce the 6 motions we described earlier? If ailerons are designed to control the roll motion, why are they located that far on the wing? Why do they deflect in opposite directions? Other methods than can be used: - Vectored Thrust - Aerodynamic Forces
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AOE 2104--Aerospace and Ocean Engineering Fall 2008 Virginia Tech 21 October 2008 Lecture 9 Click to edit Master subtitle style Aircraft Control – Ailerons and Rolling Moment Ailerons deflect differentially (one moves up while the other one moves down). The increased camber on one of the wing results in increased lift on that wing , resulting in the roll motion .
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This note was uploaded on 04/04/2010 for the course ESM 2214 taught by Professor Lesko during the Spring '10 term at Virginia Tech.

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17 Nov 3 - Stability and Control - AOE 2104-Aerospace and...

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