An Introduction to Flight Stability and...
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Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM KING FAHD UNIVERSI KING FAHD UNIVERSI TY TY Department of Aerospace En Department of Aerospace En gineering gineering An Introduction to Fligh An Introduction to Fligh t Stability t Stability and Control and Control Instructor Dr. Dr. Ayman Ayman Hamdy Hamdy Kas Kas sem sem Email [email protected].sa
Transcript of An Introduction to Flight Stability and...
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
KING FAHD UNIVERSIKING FAHD UNIVERSITYTY
Department of Aerospace EnDepartment of Aerospace Engineeringgineering
An Introduction to FlighAn Introduction to Flight Stabilityt Stabilityand Controland Control
Instructor
Dr. Dr. AymanAyman HamdyHamdy KasKassemsemEmail [email protected]
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Main Topics• Meaning of stability and control.
• Stability.
• Aircraft Anatomy.
• Equations of motion.
• Longitudinal and lateral modes.
• Flying Qualities.
• Control.
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Stability (Static and Dynamic)Stability (Static and Dynamic)• Result of small disturbances from equilibrium which
arise at random from external loads. It is categorized as static or dynamic.
• Stability is a characteristic of the vehicle dynamics which is independent of the pilot’s actions.
• Pilot related.
• Is it stable? Can it do this maneuver? How easy?
• Flying qualities.
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
ControlControl• Response of aircraft to intentionally applied
forces/moments which causes aircraft to deviate from initial equilibrium condition in a desired fashion.
• Control is affected by pilot’s interaction with the aircraft.
• Control theories (classical and modern).
• How to make the aircraft stable?
• Improving flying qualities.
• Engineers related (Company secrets).
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Static StabilityStatic Stability
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Longitudinal Static StabilityLongitudinal Static Stability
(a) Negative static stability (b) Positive static stability(c) Neutral static stability
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Dynamic StabilityDynamic Stability• For dynamic stability, motions have to be convergent or
damped out. (The vehicle will return to its original equilibrium condition after some interval of time).
• If divergent then dynamic instability exists.
• Cases (a) & (b) here are longitudinally dynamically stable, case (c) is longitudinally dynamically unstable (all are statically stable).
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
To Study Stability and control we need To Study Stability and control we need to know :to know :
• Aircraft anatomy especially controls (aileron, rudder, throttle, thrust vectoring, etc.) What parts do the job?
• Aircraft equations of motions. How is it done?
• Automatic control theory. How to do it better?
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
The eagle
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
The Hornet
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Wing Parameters
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
What about these systems ?What about these systems ?• Open or closed loop?
• regulation or tracking ?
• Identify the control loop elements?
Dr. Ayman Kassem, Aerospace Engineering Department, KFUPM
Ready for Questions
