Underwater Sound Absorbers: A Review of Published Research with an Annotated Bibliography
NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DIV
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The theoretical behavior of acoustic media is reviewed briefly to obtain an insight into the nature of the absorption problem and the limitations imposed by the theory. Then, the status of resonant and broadband absorbers and the methods used to evaluate them are examined. In conclusion, several areas needing further investigation are specified. It is pointed out that the need for absorbers within a tank would be reduced significantly--perhaps eliminated--if the acoustic impedance of the tank wall could be made approximately equal to that of water. An annotated bibliography is included.