Period, duration
February-July 2025, 24 weeks
Profile required
M2 or final-year engineering student in Mechanics, Mechatronics or Applied Physics
Gratuity
4.05/h (standard)
Location
Annecy-le-vieux ; Maison de la mécatronique ; Symme laboratory
Subject
Background :
Most of today's structures and systems vibrate under external dynamic excitations, which can damage them and reduce their performance and service life. In order to dampen and therefore protect these structures, one solution is to develop vibration absorbers that evacuate the vibratory energy from the primary structure. These absorbers consist, for example, of electromechanical resonators capable of pumping mechanical energy out of the primary structure and then evacuating it electrically.
Over the last decade, non-linear vibration absorbers, generally known as NES (Nonlinear Energy Sink), have been the subject of numerous studies in the field of non-linear dynamics. These have shown that, compared with the classic linear absorber (TMD, Tuned Mass Damper), the NES can be effective over a wider frequency band and, above all, ensures irreversible energy transfer from the primary system to the absorber (hence the name Energy Sink). However, the disadvantages of NES are still persistent. In order to overcome these disadvantages, we propose here to study a dynamically adjustable NES, whose properties can be electrically modified in real time using amplified piezoelectric actuators (APA).
This internship is part of a collaboration between the LAMCOS laboratory (LAboratoire de Mécanique des COntacts et des Structures) at INSA Lyon and the SYMME laboratory (SYstème et Matériaux pour la MEcatronique) atUniversité Savoie Mont Blanc. LAMCOS has recognized experience in the fields of vibration damping and passive and active vibration control. SYMME has over 15 years' experience in the design and testing of linear and non-linear electromechanical resonators. The NES studied in this project is based on a system already designed for vibration energy recovery applications. The respective expertise of SYMME and LAMCOS will enable us to jointly explore how to exploit the performance of this NES for vibration damping, taking advantage of ABS to :
- Explore and understand how to adjust the dynamics of the NES using APA.
- Collaborate with LAMCOS researchers to develop optimal tuning and control strategies for NES dynamics.
- Implement these strategies on an experimental platform.
Required work :
The system's bistability comes from the buckling of two beams. An electrical voltage applied to one of the lateral APAs controls the buckling by adjusting the lateral stress on the beams. The bistable NES exhibits multiple non-linear behaviors: operating regimes around one of the stable positions, the two stable positions, subharmonic and superharmonic resonances, chaos, and more.
The aim of the internship is to set up a test bench and test the adjustable bistable NES in the context of vibration damping.
Initially, a simplified model of the NES will be developed. The trainee will work with the LAMCOS team to develop optimal control strategies for the NES dynamics. The trainee will then take charge of SYMME's vibration test benches to set up experiments validating the proposed vibration control strategies. Finally, the trainee will have to upgrade the test bench in order to test the NES attenuation performance on a concrete system.
Depending on the progress of the internship, a presentation at a scientific conference or the writing of a scientific article may be envisaged. In addition, depending on the candidate's results and motivation, he or she may be considered for a doctoral grant.
Profile required:
Students in their final year of a Master's degree or engineering school in mechanical engineering, mechatronics or applied physics, with an interest in a subject combining electromechanics, non-linear dynamics and vibrations. Writing skills and a good level of English are also expected. Knowledge of scientific computing software (Matlab/Simulink/Python) and an appetite for setting up test benches and experiments are expected.
Contact
Please send your transcripts for the last two years and your CV to :
adrien.morel
@univ-smb.fr
david.gibus
@univ-smb.fr
Project team
Adrien MOREL, teacher-researcher POLYTECH A-C / SYMME
David GIBUS, teacher-researcher POLYTECH A-C / SYMME
Jonathan Rodriguez, INSA Lyon
Simon Chesne, INSA Lyon