Course detail
Aeroelasticity
FSI-OAE Acad. year: 2021/2022 Winter semester
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
Czech
Number of ECTS credits
4
Supervisor
Department
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.
Planned learning activities and teaching methods
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.
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.
The study programmes with the given course
Programme N-LKT-P: Aerospace Technology, Master's
specialization STL: Aircraft Design, compulsory
Type of course unit
Lecture
26 hours, optionally
Teacher / Lecturer
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 hours, compulsory
Syllabus
1.Measurement of flutter critical speed in aerodynamic tunnel.
Exercise
12 hours, compulsory
Teacher / Lecturer
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.