Localisation of waves in a circular membrane : experimental results and comparison with the landscape theory

Carlos Garcia (1, 2) , Nicolas Dauchez (1, 2) , Gautier Lefebvre (1, 2)

1 Roberval - Roberval
2 UTC - Université de Technologie de Compiègne

Introduction of inhomogeneities in a vibrating structure has opened some news methods for controlling the wave propagation. When those structures present randomness, localisation phenomenon can be present and, as a consequence, the behavior of the vibrating system will be drastically changed. The localisation landscape is a new tool that predicts the localisation of vibrational modes [Filoche, PNL, 2012]. It has been show that with one single measurement, not only we can predict wave localisation in complex structures, but also fully characterize the vibrational behavior in the low frequency spectrum [Lefebvre, PNL, 2016]. We present here the methodology for measuring the localization landscape on a circular membrane (bass drum). The measurement is performed using a laser vibrometer in quasi-static regime. Localisation is induced by the fixation of specific points in the membrane surface. Results are compared with numerical simulations and modal analysis.

Mots clés: localisation landscape

Domaines: Acoustique [physics.class-ph]; Vibrations [physics.class-ph]

Carlos Garcia, Nicolas Dauchez, Gautier Lefebvre. Localisation of waves in a circular membrane : experimental results and comparison with the landscape theory. e-Forum Acusticum 2020, Dec 2020, Lyon, France. pp.3337-3338, ⟨10.48465/fa.2020.0673⟩. ⟨hal-03240293⟩