Acoustics – Sound-modifying means – Mechanical vibration attenuator
Patent
1998-10-23
2000-10-10
Dang, Khanh
Acoustics
Sound-modifying means
Mechanical vibration attenuator
181209, 188380, F16F 700
Patent
active
061291773
ABSTRACT:
A tuned vibration absorber and vibration-reduced pipeline system utilizing same. The tuned vibration absorber includes a support frame, a tuning mass mounted for pivotal movement relative to the support frame about a pivot; the tuning mass including a lever, and a spring contacting the lever. In the vibration-reduced pipeline system, the absorber's support frame is preferably secured atop of the pipeline section, preferably by at least one strap, to absorb vibrations thereof. In a preferred aspect, the tuning mass includes an arm extending from the pivot in a first direction and a weight repositionably mounted thereon. The lever extends from the arm along a second direction substantially orthogonal to the first direction. Preferably the line of action (along A--A) of the spring extends substantially parallel to the first direction. An adjuster is provided for readjusting a position of the tuning mass relative to said support frame due to drift in the spring. Preferably, the absorber includes pin means, such as a readily removable pin, for quickly disconnecting the spring as well as pin means for limiting deflection of the tuning mass. A cover including first and second portions houses the tuning mass and spring.
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Tuned Vibration Absorbers, A Quiet Revolution, Lord Corporation, Aerospace Products Division, PB-6004, Aug. 1992.
Dang Khanh
Lord Corporation
Wayland Randall S.
Wright James W.
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