Damping device for sonic waveguides

Details Damping device for sonic waveguides Damping device for sonic waveguides

1989-09-11

1990-09-18

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

32420713, 333148, 73 32A, H04R 1500

Patent

active

049583328

ABSTRACT:
A damping device for damping mechanical vibrations in a small diameter elongated member, such as a waveguide carrying torsional strain waves, includes a damping material contained inside a housing on the waveguide, the damping material is a viscous liquid that does not evaporate or change viscosity over a wide temperature range and which has additives for providing adequate mass density for damping vibrations in such elongated member. The use of a viscous liquid and additives for changing the mass density permits varying the mass density to match impedances and reduce the amplitudes of any reflective waves. The viscous liquid preferably comprises a silicone base oil partially filled with zinc oxide and metal particles to give the characteristic of stable viscosity across a wide range of temperature and provide the necessary attenuation while obtaining good coupling of the damping material to the elongated member.

REFERENCES:
patent: 3526857 (1970-09-01), Dickinson
patent: 3898555 (1975-08-01), Tellerman
patent: 4071818 (1978-01-01), Krisst
patent: 4404523 (1983-09-01), Hughes et al.
patent: 4654590 (1987-03-01), Kitaura et al.
patent: 4721902 (1988-01-01), Tellerman
patent: 4803427 (1989-02-01), Mason et al.
Drawing No. 20064 from Temposonics (a Division of MTS Systems Corporation), dated 9/86.

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