Folded viscous damper

Details Folded viscous damper Folded viscous damper

1991-10-25

1993-06-15

Butler, Douglas C.

Brakes

Inertia of damping mass dissipates motion

188276, 188298, 188314, 1883225, 267136, 267122, 2671405, 267221, F16F 910

Patent

active

052190510

ABSTRACT:
A viscous damper for absorbing vibrations of low amplitude over a wide frequency range. Two working volumes of resiliently deformable material, in the form of a bellows, are provided in a folded structure joined by a base carrying a restrictive annular fluid passage. Compressive forces applied to the primary volume are transmitted by a damping fluid through the restrictive annulus to the secondary volume, the resulting energy dissipation providing a damping effect. A hermetically sealed configuration provides multi-axis damping and isolation without wearing of frictional surfaces. Large damping values are attained with linear performance over a large dynamic range. While the deformable members bear an inverse volumetric relationship as fluid is moved from one of the members through the fluid passage to the other member, the total volume of the members is substantially unconstrained, therefore permitting independent deformation with expansion or contraction of the damping fluid with respect to variations in temperature.

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