AO4009 Aeroelasticity Syllabus:
AO4009 Aeroelasticity Syllabus – Anna University PG Syllabus Regulation 2021
COURSE OBJECTIVES:
1. This course provides the basic knowledge on aero elastic phenomena and its impact on aircraft design.
2. This course will make students to illustrate the aeroelastic phenomena using simplified aerodynamic and structural models
3. This course provides insight into both static and dynamic aeroelastic phenomena and possible prevention methods.
4. This course imparts knowledge on the flutter phenomena in detail.
5. This course provides the basic knowledge on prevention and control of aeroelastic instabilities.
UNIT I AEROELASTIC PHENOMENA
Stability versus response problems – introduction to aeroelasticity and aeroelastic phenomena – Examples of aeroelastic phenomena – Galloping of transmission lines – Flow induced vibrations of tall slender structures – Instability of suspension bridges – Fluid structure interaction – The aero-elastic triangle of forces – Prevention of aeroelastic instabilities
UNIT II MODELLING OF AEROELASTIC PHENOMENA
Influence and stiffness co-efficients – illustration of aeroelastic phenomena using simplified aerodynamic and structural models – different subsonic and supersonic aerodynamic models for aeroelastic analysis – modelling techniques – aeroelastic models in state-space format Flexure – torsional oscillations of beams – Governing differential equation of motion and its solution
UNIT III STATIC AEROELASTIC PHENOMENA
Simple two dimensional idealisation – Strip theory – Exact solutions for simple rectangular wings – ‘Semirigid’ assumption and approximate solutions – Successive approximation method – Numerical approximations using matrix equations – Divergence of 2-D airfoil and Straight Wing – Aileron efficiency & reversal – Control Effectiveness – Wing deformations of swept wings
UNIT IV FLUTTER CALCULATIONS
Flutter analysis – Two dimensional thin airfoils in steady incompressible flow –Quasi-steady aerodynamic derivatives – Galerkin method for critical flutter speed – Stability of disturbed motion – Solution of the flutter determinant – Methods of determining the critical flutter speeds – Flutter Calculation – U-g Method – P-k Method – Exact Treatment of Bending –Torsion Flutter of a Uniform Wing – Flutter Analysis by Assumed Mode Method
UNIT V PREVENTION AND CONTROL
Stiffness criteria – dynamic mass balancing – dimensional similarity – effect of elastic deformation on static longitudinal stability – introduction to aeroelastic control – aeroelastic aspects in the design of aircraft – Panel flutter and its control – Prevention of tail buffeting – Aeroelastic instabilities in helicopter and engine blades and prevention methods
TOTAL: 45 PERIODS
COURSE OUTCOMES:
Upon completion of this course, students will
CO1: Have knowledge of the role of aeroelasticity in aircraft design.
CO2: Interpret the use of semi-rigid body assumptions and numerical methods in airplane design.
CO3: Arrive at the solutions for steady state aeroelastic problem.
CO4: Be knowledge with the concept of flutter analysis of aircraft wings.
CO5: Have knowledge on practical examples of aeroelastic problems.
REFERENCES:
1. Bisplinghoff.RL, Ashley,H and Halfmann,RL, “Aeroelasticity”, 2nd Edition, Addison Wesley Publishing Co., Inc., 1996.
2. Blevins, RD,”Flow Induced Vibrations”, Krieger Pub Co., 2001.
3. Broadbent,EG,“Elementary Theory of Aeroelasticity”, Bun Hill Publications Ltd., 1986.
4. Fung,YC, “An Introduction to the Theory of Aeroelasticity”, John Wiley & Sons Inc., New York, 2008.
5. Scanlan, RH and R.Rosenbaum, “Introduction to the study of Aircraft Vibration and Flutter”, Macmillan Co., New York, 1981.