Nonlinear energy pumping in Acoustics using multistable absorbers
Résumé
This work addresses the development of a vibroacoustics nonlinear absorber based on a multi-stable configuration. This work extends the concept of the acoustic nonlinear absorber developed by R. Bellet; this developed absorber was made of a high amplitude vibrating membrane described by linear and cubic stiffnesses and a dissipation described by linear and quadratic terms. Its efficiency in controlling acoustic fields was limited to high sound pressure levels and a relatively short amplitude range. This work aims at extending the functional range of this class of absorber by using multi-stability. The bistable NES developed in this work is described by linear, quadratic and cubic stiffness terms and a dissipation described by linear and quadratic terms. The presence of this quadratic damping increase complexity of the theoretical analysis, but doesn?t prevent numerical experiments. Numerical experiments show that adding a bistable property to a NES permits to extend its functioning range compared to NESs with only one stable position.