Course detail

Aeroelasticity

FSI-OAEAcad. year: 2011/2012

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 velocity solution. Applications to aircraft design.

Language of instruction

Czech

Number of ECTS credits

4

Mode of study

Not applicable.

Guarantor

doc. Ing. Jaroslav Juračka, Ph.D.

Department

Institute of Aerospace Engineering (LÚ)

Learning outcomes of the course unit

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.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

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.

Course curriculum

Not applicable.

Work placements

Not applicable.

Aims

The goal of lectures is to explain the most important aeroelastic effects, which can be met during atmospheric airplane traffic.

Specification of controlled education, way of implementation and compensation for absences

90% participation in exercises, presentation of all reports to problems from exercises.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Försching,H.W.: Grundlagen der Aeroelastik, Springer, ISBN 978-3540065401, (DE)
Fung,Y.C.: An Introduction to the Theory of Aeroelasticity, Dover Publications, ISBN 0-486-49505-1, New York, 1969 (EN)
Wring, J.R., Cooper, J.E.: Introduction to Aircraft Aeroelasticity and Loads, Antony Rowe Ltd., New Delhi, India, 2007 (EN)

Recommended reading

Daněk,V.: Aeroelasticita, VUT v Brně, skripum, Brno, 1992 (CS)
Daněk,V.:: Výpočtová cvičení z aeroelasticity, VAAZ, Brno 1979 (CS)

Classification of course in study plans

  • Programme N2301-2 Master's

    branch M-STL , 2 year of study, winter semester, compulsory

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

doc. Ing. Jaroslav Juračka, Ph.D.

Syllabus

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.

Exercise

12 hod., compulsory

Teacher / Lecturer

doc. Ing. Jaroslav Juračka, Ph.D.

Syllabus

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