Aeroelasticity (FSI-OAE)

Academic year 2023/2024
Supervisor: Ing. Jan Navrátil, Ph.D.  
Supervising institute: LÚ all courses guaranted by this institute
Teaching language: Czech
Aims of the course unit:
The goal of lectures is to explain the most important aeroelastic effects, which can be met during atmospheric airplane traffic.
Learning outcomes and competences:
Using simple calculation methods, students will learn to consider qualitatively and quantitatively the conceptual and structural setting of a designed aircraft regarding its aeroelastic characteristics and behaviour.
Prerequisites:
Knowledge of elastic theory and structure strength, basic knowledge of body dynamic.
Course contents:
The goal of the course is to familiarise students with principles of aeroelasticity for atmospheric aircraft. General introduction to problems of interaction between elastic body and fluid flow. Torsional divergence. Control surface reverse. Vibrations of aircraft structures. Modes of motion. Non-stationary aerodynamics. Buffeting. Flutter. General equations of the elastic wing motion. Critical speed solution. Applications to aircraft design.
Teaching methods and criteria:
The course is taught through lectures explaining the basic principles and theory of the discipline. Exercises are focused on practical topics presented in lectures. Teaching is suplemented by practical laboratory work.
Assesment methods and criteria linked to learning outcomes:
Awarding a course-unit credit requirements: participation in exercises (90% at the minimum), presentation of reports to problems from exercises. Examination: test.
Controlled participation in lessons:
90% participation in exercises, presentation of all reports to problems from exercises.
Type of course unit:
    Lecture  13 × 2 hrs. optionally                  
    Laboratory exercise  1 × 1 hrs. compulsory                  
    Exercise  12 × 1 hrs. compulsory                  
Course curriculum:
    Lecture 1. Introduction. Terminology.
2. Free vibration. Methods of analysis.
3. Bending and torsion vibration of wing structure.
4. Combinated bendig-torsion vibration.
5. Torsion divergence. Conditions. 2D tasks.
6. Three-dimensional case of torsion divergence.
7. Aileron reverse. Conditions. Influence of wing sweep angle on static aeroelastic effect.
8. Basics of non-stationary aeroddynamics.
9. Dynamic aeroelastic effects.
10. Principle of bending-torsion flutter. 2D and 3D cases.
11. Methods of critical flutter speed calculation.
12. Experimental aeroelasticity.
13. Cetification procedures of aeroelasactic resistivity.
    Laboratory exercise 1.Measurement of flutter critical speed in aerodynamic tunnel.
    Exercise 1. Calculation of spar deflection. Castiglian law.
2. Calculation of rigid body and systems of bodies vibration.
3. Calculation of natural frequency of harmonic bending vibration by Rayleigh method.
4. Calculation of natural frequency of harmonic torsion vibration by Rayleigh method.
5. Calculation of critical speed of torsion divergence - 2D case.
6. Calculation of critical speed of torsion divergence - 3D case.
7. Influence of excentricity on critical speed of torsion divergence.
8. Calculation of critical speed of aileron reverse - 2D case.
9. Calculation of critical speed of aileron reverse - 3D case.
10. Calculation of natural frequency of harmonic bending - torsion vibration by Galerkin method.
11. Calculation of flutter critical speed of straight wing.
12. Exemplar calculation by system MSC.Nastran.
Literature - fundamental:
1. Fung,Y.C.: An Introduction to the Theory of Aeroelasticity, Dover Publications, ISBN 0-486-49505-1, New York, 1969
2. Wring, J.R., Cooper, J.E.: Introduction to Aircraft Aeroelasticity and Loads, Antony Rowe Ltd., New Delhi, India, 2007
3. Försching,H.W.: Grundlagen der Aeroelastik, Springer, ISBN 978-3540065401,
Literature - recommended:
1. Fung,Y.C.: An Introduction to the Theory of Aeroelasticity, Dover Publications, ISBN 0-486-49505-1, New York, 1969
2. Daněk,V.: Aeroelasticita, VUT v Brně, skripum, Brno, 1992
3. Daněk,V.:: Výpočtová cvičení z aeroelasticity, VAAZ, Brno 1979
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
N-LKT-P full-time study STL Aircraft Design -- Cr,Ex 4 Compulsory 2 2 W