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Wednesday, July 10 • 16:10 - 16:30
EXPERIMENTAL EVALUATION OF THE SOUND TRANSMISSION LOSS OF PLANAR STRUCTURES EXCITED BY PLANE WAVES

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Correlation between experimental evaluations of the sound transmission loss of planar structures and numerical predictions is a challenging task. A major difficulty concerns the uncertainty related to the acoustic input involved in the experimental procedure. A commonly adopted acoustic load is a diffuse field produced in a reverberation chamber. Shape and size of the reverberation emitting chamber must be defined, according to the desired frequency range, in order to obtain a proper approximation of a diffuse field. However, discrepancies with respect to the ideal diffuse field persists because of the finite size of the chamber. The uncertainty related to the acoustic input employed in the experimental procedure makes a numerical correlation difficult or even unfeasible in case of panels whose sound transmission properties denote high sensitivity with respect to the wavenumber content of the incident field, e.g. double-leaf panels or in-plane anisotropic panels. A possible strategy to overcome such a drawback consists in identifying the actual input acoustic field. Alternatively, the experimental evaluation of the sound transmission loss may be conducted by employing a simpler acoustic load. We propose to excite the specimen with a train of plane waves in order to make experimental assessments directly comparable to results obtained with numerical methods, e.g. the transfer matrix method or the wave finite element method. The train of plane waves is produced by means of a parabolic baffle and a loudspeaker located in its focus. The adopted procedure is exposed and numerical correlations are presented in terms of sound transmission loss for few panels.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
CH

Claes Hedberg

Professor, Blekinge Institute of Technology

Authors

Wednesday July 10, 2019 16:10 - 16:30 EDT
Westmount 2
  T01 Ac. meas. & instrum., SS01 Snd & vibr measur & analys