Aeronautical engineering

Generalized Lagrange Equation for aeroelasticity: spatial and modal representation. i) Bidimensional aeroelasticity. 2-D analytical models for unsteady uncompressible flows (Theodorsen theory). Stability (divergence and flutter) and gust response of a typical section. State-space representation for aeroelasticity. ii) Three-dimensional aeroelasticity. Unsteady aerodynamic loads on vehicles in linearized uncompressible and compressible potential flows: lifting surface and panel methods, generalized-aerodynamic force matrix (GAF). Some issues on the direct simulation for the evaluation of the aerodynamic forces in transonic regime, linearization and synthesis of the aerodynamic operator. Stability (divergence and flutter) and response. Numerical methods for the aeroelastic stability (k, p-k and g methods). Static response of the flexible aircraft to an angle of attack, static and dynamic response to a step function of the angle of attack of a control surface (control surface effectiveness and reversal) and response to continuum and discrete gust. FAA and EASA aeroelastic regulations. iii) Aeroservoelasticity: general base problem in state-space form, some issues on optimal control theory for aeroelastic systems. Flutter suppression and gust alleviation strategies. iv) Special aeroelastic problems: launch vehicle and helicopter rotor aeroelasticity (flap-lag flutter, ground- e air-resonance); aeroelastic constraints in structural optimization and integrated design; nonlinear aeroelasticity (limit cycles and some issues on the mathematical description of Hopf bifurcation).

The prerequisites of the course are knowledge i) in the field of aeronautical structures and the structural dynamics of aircraft, ii) in the potential aerodynamics of compressible and compressible potential flows, iii) basic elements of control theory of linear systems.

The teacher's notes edited by the teacher are made available in full on the internet by the teacher himself. For further information, some bibliographical references are also indicated below. [1] Bisplinghoff, R.L., Ashley, H., Halfman, R.L., Aeroelasticity, Dover Pub., New York, ISBN 0-486-69189-6, 1995. [2] Fung, Y.C., An Introduction to the Theory of Aeroelasticity, Dover Pub., New York, ISBN 0-486-67871-7, 1993. [3] Dowell, E.H. et al., A Modern Course in Aeroelasticity, Third Revised and Enlarged Edition, Kluwer Academic Publishers, 1995. [4] Rodden, W.P., Johnson, E.H., MSC / NASTRAN Aeroelastic Analysis, user's guide V68, The Macneal-Schwendler Corporation, 1994.

The course is held with traditional frontal lessons (with further parallel remote connection in a pandemic emergency) both for the more theoretical aspects and in carrying out practical and design exercises.

Attendance of the face-to-face course is strongly recommended.

The assessment of the acquired knowledge is carried out with a final written test on theoretical questions and on an oral test in which both theoretical and design aspects are requested on the numerical exercises carried out during the delivery of the course.

The course is held with traditional frontal lessons (with further parallel remote connection in a pandemic emergency) both for the more theoretical aspects and in carrying out practical and design exercises.

Generalized Lagrange Equation for aeroelasticity: spatial and modal representation. i) Bidimensional aeroelasticity. 2-D analytical models for unsteady uncompressible flows (Theodorsen theory). Stability (divergence and flutter) and gust response of a typical section. State-space representation for aeroelasticity. ii) Three-dimensional aeroelasticity. Unsteady aerodynamic loads on vehicles in linearized uncompressible and compressible potential flows: lifting surface and panel methods, generalized-aerodynamic force matrix (GAF). Some issues on the direct simulation for the evaluation of the aerodynamic forces in transonic regime, linearization and synthesis of the aerodynamic operator. Stability (divergence and flutter) and response. Numerical methods for the aeroelastic stability (k, p-k and g methods). Static response of the flexible aircraft to an angle of attack, static and dynamic response to a step function of the angle of attack of a control surface (control surface effectiveness and reversal) and response to continuum and discrete gust. FAA and EASA aeroelastic regulations. iii) Aeroservoelasticity: general base problem in state-space form, some issues on optimal control theory for aeroelastic systems. Flutter suppression and gust alleviation strategies. iv) Special aeroelastic problems: launch vehicle and helicopter rotor aeroelasticity (flap-lag flutter, ground- e air-resonance); aeroelastic constraints in structural optimization and integrated design; nonlinear aeroelasticity (limit cycles and some issues on the mathematical description of Hopf bifurcation).

The prerequisites of the course are knowledge i) in the field of aeronautical structures and the structural dynamics of aircraft, ii) in the potential aerodynamics of compressible and compressible potential flows, iii) basic elements of control theory of linear systems.

The teacher's notes edited by the teacher are made available in full on the internet by the teacher himself. For further information, some bibliographical references are also indicated below. [1] Bisplinghoff, R.L., Ashley, H., Halfman, R.L., Aeroelasticity, Dover Pub., New York, ISBN 0-486-69189-6, 1995. [2] Fung, Y.C., An Introduction to the Theory of Aeroelasticity, Dover Pub., New York, ISBN 0-486-67871-7, 1993. [3] Dowell, E.H. et al., A Modern Course in Aeroelasticity, Third Revised and Enlarged Edition, Kluwer Academic Publishers, 1995. [4] Rodden, W.P., Johnson, E.H., MSC / NASTRAN Aeroelastic Analysis, user's guide V68, The Macneal-Schwendler Corporation, 1994.

The course is held with traditional frontal lessons (with further parallel remote connection in a pandemic emergency) both for the more theoretical aspects and in carrying out practical and design exercises.

Attendance of the face-to-face course is strongly recommended.

The assessment of the acquired knowledge is carried out with a final written test on theoretical questions and on an oral test in which both theoretical and design aspects are requested on the numerical exercises carried out during the delivery of the course.

The course is held with traditional frontal lessons (with further parallel remote connection in a pandemic emergency) both for the more theoretical aspects and in carrying out practical and design exercises.