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Proposed Scheme and Syllabus from academic year 2010-11
Note: One question has to be set for every 6 to 8 hours of teaching.
* Students shall register for one subject from each Group B and C Electives
Syllabus is same as existing Sub code 10ME82
Aircraft Structures - II
Unit 1. 06 Hrs
Introduction to Aircraft Structural Design:
Structural layout of the Airplane and components, Structural design V-n diagram,loads acting on major components such as wing, fuselage, tails, landing gear etc.,Concept of allowable stress and margin of safety.
Unit 2. 06 Hrs
Bending stresses in beams of unsymmetrical sections – Bending of symmetric sections with skew loads
Unit 3. 06 Hrs
Shear Flow in Open Sections:
Thin walled beams, Concept of shear flow, shear centre, Elastic axis. With one axis of symmetry, with wall effective and ineffective in bending, unsymmetrical beam sections.
Unit 4. 08 Hrs
Shear Flow in Closed Sections:
Bredt – Batho formula, Single and multi – cell structures, Approximate methods, Shear flow in single & multi-cell structures under torsion. Shear flow in single and multi-cell under bending with walls effective and ineffective.
Unit 5. 06 Hrs
Buckling of Plates:
Rectangular sheets under compression, Local buckling stress of thin walled sections, Crippling stresses by Needham’s and Gerard’s methods, Thin walled column strength. Sheet – stiffener panels. Effective width, inter rivet and sheet wrinkling failures.
Unit 6. 08 Hrs
Stress Analysis in Wing And Fuselage:
Procedure – Shear and bending moment distribution for semi cantilever and other types of wings and fuselage, thin webbed beam. With parallel and non parallel flanges, Shear resistant web beams, Tension field web beams (Wagner’s).
Unit 7. 06 Hrs
Design of Aircraft Structure:
Design criteria – Safety Factor – Design life criteria – Analysis method – Life Assessment procedures – Design Principle – Future Airworthiness Requirements– Two bay crack criteria – Widespread Fatigue damage.
Unit 8. 06 Hrs
Joints and Fittings And Introduction to Post Buckling:
General theory for the design of fittings, Estimation of fitting design loads, design of riveted, bolted and welding joints, post buckling of structures, concept of effective width.
1. Megson, T.M.G., “Aircraft Structures for Engineering Students”, Edward Arnold,1995.
2. Peery, D.J., and Azar, J.J., “Aircraft Structures”, 2nd edition, McGraw–Hill, N.Y.,
1. Bruhn. E.H. “Analysis and Design of Flight vehicles Structures”, Tri – state off set
company, USA, 1985.
2. Rivello, R.M., “Theory and Analysis of Flight Structures”, McGraw-Hill, 1993.
3. D Williams & Edward Arnold, An Introduction to the Theory of Aircraft Structures
Scheme of Examination:
Four questions from Part A and Four questions from Part B to be set. Students have to answer any FIVE full questions out of EIGHT questions, choosing at least 2 questions from part A and 2 questions from part B
Aircraft Stability and Control
Unit 1. 06 Hrs
Static Longitudinal Stability:
Historical perspective, Aerodynamic Nomenclature, Equilibrium conditions, Definition of static stability, Definition of longitudinal static stability, stability criteria, Contribution of airframe components: Wing contribution, Tail contribution, Fuselage contribution, Power effects- Propeller airplane and Jet airplane
Unit 2. 07 Hrs
Static Longitudinal Stability and Control-Stick Fixed
Introduction, Trim condition. Static margin. stick fixed neutral points. Longitudinal control, Elevator power, Elevator angle versus equilibrium lift coefficient, Elevator required for landing, Restriction on forward C.G. range,
Unit 3. 07 Hrs
Static Longitudinal Stability and Control-Stick Free
Introduction, Hinge moment parameters, Control surface floating characteristics and aerodynamic balance, Estimation of hinge moment parameters, The trim tabs, Stick-free Neutral point, Stick force gradient in unaccelerated flight, Restriction on aft C.G.
Unit 4. 06 Hrs
Static Directional Stability and Control
Introduction, Definition of directional stability, Static directional stability rudder fixed, Contribution of airframe components, Directional control. Rudder power, Stick-free directional stability, Requirements for directional control, Rudder lock, Dorsal fin. One engine inoperative condition.. Weather cocking effect.
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