Acoustic attenuation and vibration damping materials

Details Acoustic attenuation and vibration damping materials Acoustic attenuation and vibration damping materials

1994-01-25

1995-03-21

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Sonar counter-measures

181284, G10K 1116

Patent

active

054002966

ABSTRACT:
A means of enhancing the acoustic attenuation and vibration damping of a material by embedding high characteristic acoustic impedance particles, low characteristic acoustic impedance particles, or both high and low characteristic acoustic impedance particles within the matrix of the material is disclosed. The mass of the resultant material may be very low while retaining excellent acoustic attenuation, vibration damping, and structural characteristics. When particles with mismatched characteristic acoustic impedances are embedded within the matrix of a material that can support shearing loads, propagating acoustic energy that encounters the particles of the instant invention is partially reflected in random directions. That is, the propagating energy is diffused. As the propagation vectors and modes of acoustic energy are effectively randomized, the probability of localized energy absorption and damping is increased. We present acoustic attenuation and vibration damping data for some representative examples of the instant invention and other commercially available materials.

REFERENCES:
patent: 2198885 (1940-04-01), Price
patent: 3615961 (1971-10-01), Meyer et al.
patent: 3894169 (1975-07-01), Miller
Cramer, Sound-Absorbing Linings For Waterfilled Tanks, Jul. 1963, pp. 18- 4.
"Material Damping and Slip Damping" by L. E. Goodman in Shock and Vibration Handbook (3rd. Ed) C. M. Harris, ed. 1991.
"Sound Absorptive Materials" by Ron Moulder, in Handbook of Acoustical Measurements and Noise Control C. M. Harris, ed 1988.

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