Aircraft Structure I (FSI-OPK)

Academic year 2018/2019
Supervisor: doc. Ing. Ivo Jebáček, Ph.D.  
Supervising institute: LÚ all courses guaranted by this institute
Teaching language: Czech
Aims of the course unit:
The goal is to familiarize students with the most important airworthiness requirements, to explain the theoretical basis of tension calculations and deformation of thin-walled aircraft structures. Students will acquire theoretical and practical knowledge of stability of rods and walls.
Learning outcomes and competences:
Students will be acquainted with the airworthiness requirements. They will learn how to calculate the loading on individual parts of airplane, the stress and deformation for open and multibox structures and the critical stress of stability loss.
Prerequisites:
The basic knowledge of mathematics, mechanics, structure and strength.
Course contents:
History of aviation. New trends of aircraft design. Loading acting on airplane. Airworthiness requirements, manoeuvring and gust envelopes. The integral view of analysing the stress and deformation in aircraft structures. Ultimate strength of thin-walled airframe structure. Design methods of mass effective aircraft structures. Stress distribution in open and multibox structures. Stability of bars and plates. Beam structures, critical load and load carrying capacity of semi-monocoque and monocoque structures. Load carrying capacity of primary structural parts. Sandwich structures. The modern methods of stress-deformation analysis.
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:
Conditions for the course-unit credit award: participation in lessons (80% at least), presentation of the report elaboration from laboratory exercises. The exam has written (theoretical part and practical exercises) and oral parts.
Controlled participation in lessons:
Both lectures and exercises are compulsory, and the attendance (80% at least) is checked and recorded. The absence (in justifiable cases) can be compensated by personal consultation with the lecturer and elaboration of individually assigned topics and exercises. Individual tasks must be finished and handed in the week course-unit credits are awarded at the latest
Type of course unit:
    Lecture  13 × 4 hrs. optionally                  
    Exercise  11 × 3 hrs. compulsory                  
    Labs and studios  2 × 3 hrs. compulsory                  
Course curriculum:
    Lecture 1. New trends in aerospace engineering. Types of aircraft.
2. Main airworthiness requirements. Maneuvering and gust envelopes.
3. Flight and ground load cases. Loading of wing and tail unit.
4. Methods of design weight effective aircraft structures. Stress intensity
5. Stress distribution in thin-walled open sections. Bending shear centre
6. Deformation of the structure, elastic axis, influence of curvature and bent of beam.
7.The influence of deformation. Increasing the stiffness
8. Spar structure.
9. Single cell and multi-Cell spar structures.
10. Stability of columns . Influence of combined loads.
11. Stability of plates. Influence of curvature and border conditions.
12. Influence of slenderness ratio, combined loads, multiparametric systems
13. Load cyrrying capacity of the beem, semi-monocoque and monocoque structure.
14. Optimisation of aircraft structures
15. Stress analyses and design of sandwich structures
16. Calculation of primary structural parts and joints.
17. Speciality of calculation of wooden and composite structures.
    Exercise 1. Introduction using brochures and videos.
2. Manoeuvring envelope.
3. Gust envelope.
4. Introduction to SAVLE software application.
5. Wing loading and tail surface loading in SAVLE.
6. Wing loading and tail surface loading in SAVLE.
7. Landing gear system loading - in connection to SAVLE.
8. Open sections, examples for stress and shear centre calculations.
9. Spar structures – example.
10. Lab. protocol.
11. Stability calculations using tables and supporting diagrams.
    Labs and studios 1. Laboratory static tests of rods.
2. Laboratory static tests of walls.
Literature - fundamental:
2. Niu, m. C., Airframe Structural Design, Hong KonG ConMilit Press, ISBN 962-7128-09-0, Hong kong, 1988
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
M2I-P full-time study M-STL Aircraft Design -- Cr,Ex 7 Compulsory 2 1 W