Completed notes of the course

Page 1

Politecnico di Milano - Master in Aeronautical engineering Notes of the course of: 055736 - Airplane Performance and Dynamics of the academic year 2023/24, held by Professor Carlo RIBOLDI Disclaimer: professor Riboldi is not the author of these notes. The numbers in pencil that appear in the notes refer to the number of the page of professor’s notes available on WeBeep. These notes only cover the theoretical lectures (exercise sessions are not included). I Flight Dynamics Introduction - Airplane modelling − →different models for different analysis • Steady/quasi-steady analysis – Aircraft − →Point in 3D space [good for the initial design] – Input (?) − →Basic * weight * Aerodynamic polar (Lift and drag coefficients) * Thrust / power installed – Suitability − →Flight performances for most legs of the mission (which are performed in steady conditions) • Dynamic analysis [good for later stages of the design] – Aircraft is modelled as * rigid body * assembly of rigid bodies * flexible body (all of them in 3D space) – input − →more detailed, and it will depend on geometry, structural choices and configuration – Stability * Studying dynamic manoeuvres * Assessing flying qualities * Setting up control systems / testing control systems * Building up a simulator We are going to start from the modelling of an aircraft as a rigid body in 3D space − →We will have to simplify the model to the point they are suitable for static / quasi static analysis. II Reference Systems Why do we need reference systems? • They allow to write simple expressions of physical quantities – kinematics-related * body position/orientation in 3D space * velocity/acceleration – dynamics-related * inertial properties * forces (gravity, aerodynamic forces ...) Airplane performance and dynamics, lectures…