Sciences & Société
Soutenance de thèse : Shaoyi ZHOU
Advances in Passive and Active Vibration Damping Techniques
Doctorant : Shaoyi ZHOU
Laboratoire INSA : LaMCoS
Ecole doctorale : ED162 : Mécanique, Energétique, Génie Civil, Acoustique de Lyon
This thesis presents some advances in passive and active damping techniques. The first part is dedicated to two types of inerter-based passive vibration control devices, the tuned mass damper with inerter (TMDI) and the series double tuned mass dampers with inerters (SDTMDI). The optimal design of TMDI for an uncertain mechanical system is carried out via an algebraic approach, meanwhile, the two possible configurations of SDTMDI are optimized according to an extended version of fixed points theory. In the next, a negative stiffness element (NSE) is integrated into the classic and inerter-based dynamic vibration absorbers (DVAs), revealing its significant benefit in improving the control performance. Besides, a completely analogous relationship between DVAs with a NSE and piezoelectric shunt dampers with appropriate shunt circuits is established. The third part focuses on a general control law for both hybrid TMD and inerter-based DVA, which assures the fail-safe mechanism and the theoretical hyperstability. Finally, the application of electromagnetic transducer for shunt damping and energy harvesting is investigated. For the electromagnetic shunt damping (EMSD), both non-resonant and resonant shunt circuits with negative impedances are optimized, implying that the use of negative impedances can enhance the electromechanical coupling, thereby improving the damping capability. And a numerical study is performed on the influence of internal electrical impedances of transducer on the maximally attainable harvested power.
Amphithéâtre Emilie du Châtelet - Bibliothèque Marie Curie - INSA Lyon