Vibration Mitigation of Nonlinear Structures using Nonlinear Energy Sinks

Speaker:
Mr. Régis Viguié,
Ph.D. Candidate,
Aerospace and Mechanical Engineering Department,
University of Liège,
Liège, BelgiumAbstract:The tuned mass damper (TMD) is a simple and efficient device but it is only effective when it is precisely tuned to the frequency of a particular vibration mode. Because nonlinear vibrating structures have resonant frequencies that vary with the total energy in the system, the efficiency of a TMD is questionable in this case. In order to overcome this limitation, the nonlinear energy pumping phenomenon from the main mechanical structure to a coupled, local, passive nonlinear energy sink (NES) is investigated. It is shown that, unlike the TMD, an NES has no preferential resonant frequency, which makes it a good candidate for vibration mitigation of MDOF linear or nonlinear vibrating structures. In this presentation, the essential features of an NES will be described. Some potential applications of nonlinear energy pumping, including vibration absorption in drill-string systems and aeroelastic instability suppression, will be presented. Finally, the determination of a suitable design for the NES will also be discussed as well as some possible realizations of this nonlinear absorber.

Location: Kaprielian Hall (KAP) - 209

Audiences: Everyone Is Invited

Contact: Evangeline Reyes