Aeroelasticity (FSI-OAE-A)

Academic year 2020/2021
Supervisor: doc. Ing. Jaroslav Juračka, Ph.D.  
Supervising institute: LÚ all courses guaranted by this institute
Teaching language: English
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. Two-dimensional case of torsion divergence.
3. Three-dimensional case of torsion divergence.
4. Aileron reverse.
5. Influence of wing sweep angle on static aeroelastic effect.
6. Free vibration.
7. Bending and torsion vibration.
8. Basics of non-stationary aeroddynamics.
9. Dynamic aeroelastic effects.
10. Princiole of bending-torsion flutter
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 critical speed of torsion divergence - 2D case.
3. Calculation of critical speed of torsion divergence - 3D case.
4. Influence of excentricity on critical speed of torsion divergence.
5. Calculation of critical speed of aileron reverse - 2D case.
6. Calculation of critical speed of aileron reverse - 3D case.
7. Calculation of natural frequency of harmonic bending vibration by Rayleigh method.
8. Calculation of natural frequency of harmonic torsion vibration by Rayleigh method.
9. Calculation of natural frequency of harmonic bending - torsion vibration by Galerkin method.
10. Calculation of non-stationary lift coefficient at harmonic vibration of thin profile.
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, 0
2. Bisplinghoff,R.L.- Ashley,H.: Principles of Aeroelasticity, 0
3. Försching,H.W.: Grundlagen der Aeroelastik, 0
Literature - recommended:
1. Fung,Y.C.: An Introduction to the Theory of Aeroelasticity, 0
2. Daněk,V.:: Aeroelasticita, , 0
3. Daněk,V.:: Výpočtová cvičení z aeroelasticity, , 0
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
M2I-A full-time study M-STL Aircraft Design -- Cr,Ex 4 Compulsory 2 2 W