Accession Number : ADA185944

Title :   The Properties of Sound Propagation in Liquid Constrained Viscoelastic and Polymeric Structures.

Descriptive Note : Interim rept. Jun 85-Jul 87,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Horne, M P

PDF Url : ADA185944

Report Date : 09 Oct 1987

Pagination or Media Count : 19

Abstract : Detailed experiments were conducted to study the sound propagation in liquids contained by pipes constructed of polymeric materials. In the experiments, vertically aligned cylinders containing water were ensonified at one end by a piston-driven sound source. Approximately 60 dB sound attenuation was observed in pipes constructed of viscoelastic materials, the effect increasing with frequency and loss-tangent. Sound propagation in more rigid polymeric pipes exhibited similar characteristics to that of metallic pipes, in that negligible attenuation was observed. Keywords: Viscoelasticity; Sound wave propagation; Sound attenuation; Loss tangent; Polymeric materials; Random noise.

Descriptors :   *LIQUIDS, *POLYMERS, *SOUND TRANSMISSION, ACOUSTIC ATTENUATION, ATTENUATION, MATERIALS, METALS, NOISE, PIPES, RIGIDITY, SOUND WAVES, VISCOELASTICITY, WATER, VELOCITY, STEEL, ACRYLIC RESINS, POLYVINYL CHLORIDE, TEST METHODS, NOISE GENERATORS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE