Aeroelasticity

Garant předmětu:

Lecturer:

Tutor:

Supervisor:

Department of Aerospace Engineering

Synopsis:

The course is focused at interaction of aerodynamic, elastic and inertial forces at airplane. There is considered an influence of change of applied load due to structure deformation of elastic airplane structure. The following aeroelastic phenomena are analyzed modeled, calculated and simulated: Flutter, buffeting, whirl flutter, control reversal and efficiency, dynamical response during flight and dynamical response for ground maneuver. The course is also aimed at obtaining an input data for aeroelastic calculation therefore determination of mass and stiffness airplane characteristics. Creating of airplane dynamical mode including stiffness optimization at experimental data. There are also presented theories of unsteady aerodynamic within the course, subsonic and supersonic. There are presented marginally requirement of airworthiness authorities for aircraft aeroelasticit resistance. A flight flutter tests implementation is included in the course. In addition, there are present a structural design modification for increasing airplane resistance against aeroelastic phenomena’s.

Requirements:

Aircraft design.

Syllabus of lectures:

1. Introduction. Historical overview of aeroelastic phenomena

2. Stiffness of structure

3. Load deformation feedback of aircraft structure

4. Basic of unsteady aerodynamic

5. Dynamic aeroelasticity phenomena’s

6. Flutter, three degree of freedom airfoil model

7. Multiple degree of freedom models in aeroelasticity

8. Airworthiness requirement for flutter resistance

9. Mass balancing and control surface dampers

10. Servoelasticity, active flutter suppression, smart structures

11. Static aeroelasticity

12. Beam model for static aeroelasticity

13. Torsion divergence of lifting surface

14. Control reversal and efficiency

15. Whirl Flutter

16. Turbomachinery

Syllabus of tutorials:

1. Introduction to aeroelasticity

2. Mass characteristic

3. Elasticity – analytical determination of airplane stiffness

4. Elasticity – experimental determination of airplane stiffness (stiffness measurement and ground vibration test)

5. Laboratory – mass characteristic of control surface

6. Unsteady aerodynamic

7. Flutter analysis

8. Laboratory – Airfoil flutter analysis by Matlab and by FEM software Nastran

9. Airplane flutter analysis including dynamical optimization of model to results from ground vibration test.

10. Flutter analysis – Method of approximation, panel flutter, supersonic flutter, airworthiness requirement

11. Aircraft structure design modification to prevent aeroelastic phenomena

12. Flight flutter tests

13. Dynamical response – flight through turbulence, impulse form pilot, ground maneuver

14. Torsion divergence, control reversal and efficiency

15. Whirl Flutter

16. Turbomachinery

Study Objective:

Introdaction to basic of computational methods and experimental approaches to determination of non-solid aerospace constuction characteristics.

Study materials:

S. Slavík: Aeroelasticita leteckých konstrukcí, skripta ČVUT 1997, ISBN 80-01-01415-0

V. Daněk: Aeroelasticita, skripta. VUT Brno 1987

Hodges,D.H, Pierce G.A.: Introduction to Structural Dynamics and Aeroelasticity, Cambridge University Press, 2002, ISBN 0-521-80698-4

Z. Kopřiva, J. Maleček: Aeroelasticita, učebnice U-904, VAAZ Brno 1987

Fursching H .W.: Grunlagen der Aeroelastik, Springer Verlag, Berlin 1974 (ruský překlad: Osnovy aerouprugosti, Mašinostrojenie, Moskva 1984)

Dowel E. H., Curtiss H.C., Scanlan R. H., Sisto F.: Modern Course in Aeroelasticity, Alphen aan den Rijn, Sijthoff and Noordhoff, The Netherlands 1980

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans: