Abstract
A unique facility at the Applied Research Laboratory (The Pennsylvania State University) is the Machinery Quieting Laboratory (MQL), where various measurements may be made on submerged, tethered, powered experimental underwater vehicles with simulated propulsor shaft loading. In the present application, it was desired to evaluate the contribution to vehicle self-noise generated by the power plant which propagates to the transducer via structural paths rather than through the water path. To obtain valid results, it was therefore necessary to blind the transducer to water-borne sound while, at the same time, insuring that the transducer elements remained acoustically loaded by an anechoic medium. To fulfill these requirements, a large floodable wooden chamber was fabricated which measured 16 × 16 × 12 wavelengths at the frequency of interest. Additional interior absorption in the form of wooden wedges was incorporated and the exterior was completely covered with cell tire neoprene rubber to form a pressure-release reflecting surface. The design, evaluation, and use of this anechoic shield in the MQL are described. [Supported by Naval Ordnance System Command.]
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