UACE2017 Proceedings: Near field characterisations of test objects with periodic structure

Session:
Underwater acoustic calibration, testing, facilities and standards
Paper:
Near field characterisations of test objects with periodic structure
Author(s):
Lian Wang, Gary Hayman, Stephen Robinson, Graham Beamiss
Abstract:
The acoustic response of a planar panel with a simple structure is determined by near field measurement in a laboratory tank using 1-D linear and 2-D planar arrays in parallel with the face of the panel. A parametric array source is used in order to measure very wide frequency responses and to reduce the effects of the edges of the panel. The panel consists of two 400 mm by 400 mm parallel stainless steel plates mounted either side of a vertical grid of 20 air-filled cylindrical tubes, equally-spaced with a separation of 20 mm. The panel is also measured in two other configurations: the two plates with the tubes removed and the tubes with the plates removed. The periodical effects of the structures on the scattering by the panels are identified and finite element simulations of forward and backward scattering are compared to the measured data.
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