Local patch acoustic holography methods in enclosed spaces

abstract

English

The paper compares reconstruction accuracy and computational cost of three patch acoustic holography algorithms applicable in the enclosed spaces for prediction of sound field near sources. Algorithms under investigation were DL-SONAH, classical NAH with spatial transformations and hologram aperture enlargement and IBEM. All of the selected algorithms take an advantage of using double layer microphone array for measurement of sound pressure field. The reconstruction accuracy of all algorithms is determined by using of simple 3D model of curved radiating surface on the basis of calculation of difference between true acoustic quantity (pressure, velocity or intensity) values very close to the surface and predicted sound field at same positions. All these methods use different calculation procedure to obtain predicted sound field near source surface, thus comparison of effectiveness of these algorithms including prediction accuracy-to-computational cost ratio is useful to determination their applicability in practice. Results of prediction error and calculation time are presented and compared.

acoustic holography, acoustic imagining, sound sources, holography algorithms, confined space

HAVRÁNEK, Z.; BEJČEK, L.

2008

1. 5. 2008

ASA

USA

0001-4966

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA

123

5

United States of America

1

1

1