Fluidborne noise attenuator

Details Fluidborne noise attenuator Fluidborne noise attenuator

1979-03-07

1982-02-09

Hartary, Joseph W.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181248, 181252, 181276, F01N 104, F16L 5502

Patent

active

043146210

ABSTRACT:
A fluidborne noise attenuator (14) comprises a dampening medium (27) which exhibits a bulk modulus (e.g., 50,000 psi to 180,000 psi) substantially greater than that of an inert gas, such as nitrogen, and substantially less than that of a hydraulic working fluid (e.g., 225,000 psi). The attenuator (14) is capable of attenuating noise levels of hydraulic fluid over wide frequency and mean system pressure ranges in contrast to conventional attenuators which are "tuned" for the attenuation of noise levels at a specific frequency and mean system pressure.

REFERENCES:
patent: 1844106 (1932-02-01), Schnell
patent: 2261948 (1941-11-01), Beach
patent: 2392247 (1946-01-01), Katcher
patent: 2495693 (1950-01-01), Byrd, Jr. et al.
patent: 3113635 (1963-12-01), Allen et al.
patent: 3142354 (1964-07-01), Kammerer et al.
patent: 3532125 (1970-10-01), Everett et al.
patent: 3665967 (1972-05-01), Kachnik
patent: 4067195 (1978-01-01), Malecha
patent: 4086984 (1978-05-01), Johansson

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