Ing Ind - Inf (Mag.)(ord. 270) - BV (469) AERONAUTICAL ENGINEERING - INGEGNERIA AERONAUTICA
054229 - AEROSERVOELASTICITY OF FIXED AND ROTARY WING AIRCRAFT
Main training objectives
The course aims to provide the necessary skills for the design, analysis and verification of aero-servoelastic systems. These skills represent an essential knowledge for those who want to approach the design of modern, energy-efficient and environmentally friendly aircraft, designed to be ever lighter and therefore more and more flexible. The vision of the aircraft as an integrated system of systems allows the student to understand the importance of the optimal multidisciplinary design, able to exploit the synergies between the different systems, avoiding the emergence of adverse interactions that can significantly limit aircraft performance. The course illustrates the characteristic problems of stability and response for fixed-wing and rotary-wing and hybrid configurations.
The course content is presented through lectures. To supplement the lessons few exercises are presented. To encourage further assimilation of acquired concepts computer labs are used, exploiting software provided during the course. Finally, the development of individual projects by students is pursued.
Risultati di apprendimento attesi
Ability to apply knowledge and comprehension
Ability to formulate independently dynamic multi-disciplinary engineering problems. to design a multidisciplinary solution to aeronautical engineering problems.
Organize a presentation of a design project.
Review of dynamics of the flexible free aircraft
General formulation of the aeroelastic problem; nonlinear equations of the flexible aircraft, mean-axes and practical-mean-axes.
Phenomenology; incompressible potential models (Wagner, Theodorsen, Kussner-Schwartz, Sears and Isaacs); compressibility effects; Integral panel methodologies for compressible/incompressible flows for generic motions and for harmonic motions; unsteady aerodynamic forces in the transonic field: modelling through Euler and Navier Stokes equations. The dynamic stall. Reduced models and finite state representations.
Stability for non-linear systems and bifurcations; periodic stability; limit cycle oscillations and harmonic balance; Lyapunov exponents of for the study of stability; use of the descriptive function for the study of non-linear phenomena. Uncertainty and its quantification; robust analysis. Transient analysis: deterministic and stochastic approaches.
Aeroelastic phenomenology for fixed-wing aircraft
Flutter, Buffet, T-tail flutter, aircraft body-freedom flutter; panel flutter; transonic dip and LCO; aileron buzz; interactions with controls and structural coupling. Gust response and control systems for gusts alleviation. Morphing technology for aeroelastic control.
Aeroelastic phenomenology for rotary wing aircraft
Flexible rotor modeling. Flap-pitch stability; Lag-Flap stability; periodic stability of the rotor in forward flight. Stall-flutter. Ground resonance and Whirl-flutter. Rotorcraft Pilot Couplings. Response to the gust and interaction with obstacles.
Modalità di valutazione
The level achieved by students is verified by online multiple-choice assignments and through an oral presentation of the design project. The multiple-choice tests are designed to verify the basic knowledge of the theoretical problems. The design exercise is intended to verify the students' ability to work on concrete problems by choosing the most appropriate analytical and modeling tools, justifying their choice and describing how to use. No written report for the design project is required.
Y.C. Fung, Theory of Aeroelasticity, Editore: Dover, Anno edizione: 1969
E. Dowell, A modern course in aeroelasticity, Editore: Springer, Anno edizione: 2015
W. Johnson, Rotorcraft Aeromechanics, Editore: Cambridge University Press, Anno edizione: 2013
Bramwell, A. R. S.; Balmford, David; Done, Georg, Bramwell's Helicopter Dynamics, Editore: Elsevier Butterworth-Heinemann, Anno edizione: 2001 http://www.sciencedirect.com/science/book/9780750650755
Tipo Forma Didattica
Ore di attività svolte in aula
Ore di studio autonome
Laboratorio Di Progetto
Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese