AERO0035-1 : Nonlinear vibrations of aerospace structures

Study Programmes 2016-2017

AERO0035-1

Nonlinear vibrations of aerospace structures

Duration :

30h Th, 30h Pr

Number of credits :

Master in aerospace engineering (120 ECTS)		5

Lecturer :

Gaëtan Kerschen, Jean-Philippe Noël

Coordinator :

N...

Language(s) of instruction :

English language

Organisation and examination :

Teaching in the first semester, review in January

Units courses prerequisite and corequisite :

Prerequisite or corequisite units are presented within each program

Learning unit contents :

With continual interest in expanding the performance envelope of engineering systems, structural nonlinearities, which include friction, contact, nonlinear materials and large-displacement-related effects, are increasingly encountered in real-world applications. For instance, the vibration tests of two Airbus aircraft, namely the A400M and the A350XWB, revealed nonlinearities in engine mounts, hydraulic actuators, landing gears and in the auxiliary power unit. This course covers the various aspects of the vibration engineering practice from the analysis of measured data to the simulation using a finite element model. Theoretical, numerical and experimental approaches are described to learn how to recognize, model and understand nonlinear behaviour. Hands-on practice with the Nonlinear Identification to Design (NI2D) software and the study of a F-16 aircraft and of an Airbus Defence and Space satellite serve to illustrate the new methods, concepts and tools.
Course outline:
- Typical nonlinearities in real-world structures (contact, friction, large displacements, materials)
- Impact of nonlinearities on the structural vibrations
- Nonlinear system identification from experimental data (detection, characterization, parameter estimation)
- Nonlinear simulation using a finite element model (nonlinear modes, nonlinear frequency responses, bifurcations)
- Nonlinear designs

Learning outcomes of the learning unit :

Prerequisite knowledge and skills :

Advanced knowledge of the theory of linear vibrations: vibration modes, resonance frequencies, finite element analysis, time integration, single and multiple degree of freedom systems.

Planned learning activities and teaching methods :

Theoretical lectures mixed with exercise sessions using the Nonlinear Identification to Design (NI2D) software.

Mode of delivery (face-to-face ; distance-learning) :

Face to face