Accession Number : AD0430785


Title :   DEVELOPMENT OF SOUND DAMPING TREATMENT FOR SONAR DOMES.


Descriptive Note : Progress rept. no. 1,


Corporate Author : MARE ISLAND NAVAL SHIPYARD VALLEJO CALIF RUBBER LAB


Report Date : 19 Feb 1964


Pagination or Media Count : 44


Abstract : The work was primarily directed towards the attenuation of flexural vibrations of the skin and/or reinforcing rods in the dome by applying a damping layer onto the surfaces of these structural members. One compound of polyvinyl chloride-acetate and twelve elastomeric vulcanizates were tested as damping materials. A Hypalon 20 compound was selected as the most promising of these materials. Good dampings were obtained with 1/4 inch and 3/8 in. thick layers of this material bonded to 1/16in. thich steel with epoxy cements. It was found, however, that numerous air pockets were trapped in the cement layers. The air pockets are considered to be objectionable because they might promote sound reflection and/or sound absorption and thus reduce the sound-transparency of the dome. (Author)


Descriptors :   *SONAR DOMES , VIBRATION ISOLATORS , DAMPING , RUBBER , RESONANCE , SIGNAL TO NOISE RATIO , FREQUENCY , RODS , GRILLES , SONAR RECEIVERS , VIBRATION , BUTYL RUBBER , VINYL PLASTICS , VULCANIZATES


Distribution Statement : APPROVED FOR PUBLIC RELEASE