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Proposed Scheme and Syllabus from academic year 201011Aeronautical EngineeringVII Semester
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 Control Engineering
Syllabus is same as existing Sub code 10ME82 Aircraft Structures  II
PART A Unit 1. 06 Hrs Introduction to Aircraft Structural Design: Structural layout of the Airplane and components, Structural design Vn 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 Unsymmetrical Bending: 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 & multicell structures under torsion. Shear flow in single and multicell under bending with walls effective and ineffective. PART B 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. Text Books: 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., 1993. Reference: 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”, McGrawHill, 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 BAircraft Stability and Control
PART A 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 ControlStick 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 ControlStick Free Introduction, Hinge moment parameters, Control surface floating characteristics and aerodynamic balance, Estimation of hinge moment parameters, The trim tabs, Stickfree 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, Stickfree directional stability, Requirements for directional control, Rudder lock, Dorsal fin. One engine inoperative condition.. Weather cocking effect. 