Modeling of micro-perforated panels in a complex vibro-acoustic environment using patch transfer function approach

Laurent Maxit (1) , C. Yang (2) , Li Cheng (2) , Jean-Louis Guyader (1)

1 LVA - Laboratoire Vibrations Acoustique
2 Department of Mechanical Engineering [Hong Kong]

The micro-perforated panel (MPP) with a backing cavity is a well known efficient device for noise absorption. This device has been thoroughly studied in the experimental conditions of an acoustic tube (Kundt tube), in which the MPP is excited by a normal incident plane wave in one dimension. In an industrial situation, the efficiency of MPP may be influenced by the vibro-acoustic behaviour of the surrounding systems as well as excitation. To deal with this problem, a vibroacoustic formulation based on the Patch Transfer Functions (PTF) approach is proposed to model the behaviour of micro-perforated structure in a complex vibro-acoustic environment. PTF is a substructuring approach which allows assembling different vibro-acoustic subsystems through coupled surfaces. Upon casting micro-perforations and the flexibility of the MPP under transfer function framework, the proposed PTF formulation provides explicit representation of the coupling between subsystems and facilitates explanation of physical phenomenon. As an illustration example, application to a MPP with a backing cavity located in an infinite baffle is demonstrated. The proposed PTF formulation is finally validated through comparison with experimental measurements available in the literature.

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

Laurent Maxit, C. Yang, Li Cheng, Jean-Louis Guyader. Modeling of micro-perforated panels in a complex vibro-acoustic environment using patch transfer function approach. Journal of the Acoustical Society of America, 2012, pp.2118-2130. ⟨hal-00744503⟩