Nov 29, 2010 - approach, a model for which the tortuosity is corrected to account for the holes interaction effects coupled to the jet-like effects is developed.
Invitation to public thesis defense In partial fulfillment of the requirements for the degree of Doctor of philosophy
Rostand TAYONG BOUMDA (Master of science, Ecole Centrale de Lyon)
Acoustical properties of systems incorporating micro-perforated plates and absorbing materials under high level of excitation This work deals with the acoustical properties of systems incorporating Micro‐Perforated Panels (MPP) and absorbing materials under high level of excitation. Absorbent systems composed of an air‐cavity backed MPP are first of all studied at high level of excitations. An analytical model involving two dimensionless parameters and an optimum Mach number is proposed. A formula is proposed that predicts the variations of the absorption peak with the acoustical Mach number. Holes interaction effects are then studied theoretically and experimentally under high levels of excitations. Following an equivalent fluid approach, a model for which the tortuosity is corrected to account for the holes interaction effects coupled to the jet‐like effects is developed. Multi‐layered absorbents composed of MPP and porous materials submitted to high level of excitations are the main topic of interest in the third chapter. Forchheimer's law is used to model each medium of the multi‐layer.
Venue : I.S.A.T. Nevers Amphi 2 Date : Monday 29th Nov 2010
Sound transmission study under high level of excitation is introduced in Time : 2:00pm the fourth chapter. Members of jury : Claude DEPOLLIER Professor Université du Maine Marie‐Annick GALLAND Professor Ecole Centrale de Lyon Noureddine ATALLA Professor Université de Sherbrooke Nicolas DAUCHEZ Professor SUP’MECA Paris Thomas DUPONT Assistant professor Université de Bourgogne Philippe LECLAIRE (Director) Professor Université de Bourgogne
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