Course detail

Aeroelasticity

FSI-OAE-AAcad. year: 2023/2024

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.

Language of instruction

English

Number of ECTS credits

Mode of study

Not applicable.

Guarantor

Ing. Jan Navrátil, Ph.D.

Department

Institute of Aerospace Engineering (LÚ)

Offered to foreign students

Of all faculties

Entry knowledge

Knowledge of elastic theory and structure strength, basic knowledge of body dynamic.

Rules for evaluation and completion of the course

Awarding a course-unit credit requirements: participation in exercises (90% at the minimum), presentation of reports to problems from exercises. Examination: test.
90% participation in exercises, presentation of all reports to problems from exercises.

Aims

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

Study aids

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Bisplinghoff,R.L.- Ashley,H.: Principles of Aeroelasticity, 0
Försching,H.W.: Grundlagen der Aeroelastik, 0
Fung,Y.C.: An Introduction to the Theory of Aeroelasticity, 0

Recommended reading

Daněk,V.:: Aeroelasticita, , 0
Daněk,V.:: Výpočtová cvičení z aeroelasticity, , 0
Fung,Y.C.: An Introduction to the Theory of Aeroelasticity, 0

Elearning

eLearning: currently opened course

Classification of course in study plans

  • Programme N-AST-A Master's 2 year of study, winter semester, compulsory
  • Programme N-ENG-Z Master's 1 year of study, winter semester, recommended course

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

Ing. Jan Navrátil, Ph.D.

Syllabus

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 hod., compulsory

Teacher / Lecturer

Ing. Jan Navrátil, Ph.D.

Syllabus

1.Measurement of flutter critical speed in aerodynamic tunnel.

Exercise

12 hod., compulsory

Teacher / Lecturer

Ing. Jan Navrátil, Ph.D.

Syllabus

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.

Elearning

eLearning: currently opened course