Abstract
Inverse pellicular mode analysis is an approach to reconstruct an acoustic source from measurements in the sound field. After a source is reconstructed, the simulation can be used to predict the sound pressure level at some distance from the source. The method is especially useful for considering acoustic treatments such as partial enclosures and barriers. Pellicular modes are generated by assuming a thin acoustic layer around the source boundary and determining the acoustic modes. These acoustic modes are then used as structural modes and serve as basis functions for the inverse calculation. However, the quality of the reconstruction depends greatly on the selection of measurement locations. In this research, inverse pellicular mode analysis is used to reconstruct the normal boundary velocity on a small generator set. Different measurement set locations are considered and sound pressure levels in the field are calculated and compared to direct measurement to assess the quality of the reconstructed source. The reconstructed source is then utilized to predict the insertion loss of a partial enclosure.
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