DEVELOPMENT OF SOUND DAMPING TREATMENT FOR SONAR DOMES.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 19, 1964
- Accession Number
- AD0430785