Acoustic absorption and damping material with piezoelectric ener

Details Acoustic absorption and damping material with piezoelectric ener Acoustic absorption and damping material with piezoelectric ener

1995-08-16

1996-06-11

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Sonar counter-measures

181294, H04K 300

Patent

active

055263240

ABSTRACT:
Acoustic absorption and vibration damping materials are produced by mixing electrically conductive particles or strands into a piezoelectric matrix material. The electrically conductive particles or strands act as small localized electrical short-circuits within the matrix material and effectively dissipate the electric charges produced by piezoelectric effect from the pressure of acoustic or vibrational energy as heat. All energy thus converted into heat is subtracted from the original acoustic or vibrational energy, resulting in acoustic absorption and/or vibration damping.

REFERENCES:
patent: 3515910 (1970-06-01), Fritz et al.
patent: 3614992 (1971-10-01), Whitehouse et al.
patent: 4628490 (1986-12-01), Kramer et al.
patent: 5400296 (1995-03-01), Cushman et al.
Hartmann & Javzynski "Ultrasonic hysteresis absorption in polymers" J. Appl. Phys. vol. 43, No. 11, Nov. 1972, 4304-4312.
Japan New Materials Report, May-Jun. 1995, p. 9.

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