Acoustic absorption or damping material with integral viscous da

Details Acoustic absorption or damping material with integral viscous da Acoustic absorption or damping material with integral viscous da

1997-01-09

1998-04-28

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Sonar counter-measures

G10K 1116

Patent

active

057454345

ABSTRACT:
Acoustic absorption or vibration damping materials are produced by mixing at least two species of particles into a restricted amount of matrix material in order to produce an acoustic absorption or vibration damping material with tortuous passageways throughout the material. The tortuous passageways of the instant invention serve to: a) reduce acoustic reflectivity at the surface, b) provide channels within which the interfacing medium such as air can interact viscously, c) increase the surface area between interfacing media and, d) improve structural stiffness by adding thickness without adding weight. Particle species within the matrix material are differentiated by their acoustic impedances. A particle species of particular interest is crumb tire rubber from used tires. This material is inexpensive and its use in this application has the societal advantage of making productive use of a material that is currently polluting the environment.

REFERENCES:
patent: 5272284 (1993-12-01), Schmanski
patent: 5400296 (1995-03-01), Cushman et al.
patent: 5526324 (1996-06-01), Cushman
patent: 5536910 (1996-07-01), Harrold et al.
Hautmann & Jarzyuski "Ultrasonic hysteresis absorption in polymers" J. Appl. Phys, vol. 43, No. 11, Nov. 1972.

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