초록 ▼

Disclosed is a vibration damping and isolation apparatus having a passive damping mechanism. The passive damping mechanism includes a piston and first and second elements of magnetic material with a shaft extending therebetween. The piston and shaft are linearly movable relative to one another upon

Disclosed is a vibration damping and isolation apparatus having a passive damping mechanism. The passive damping mechanism includes a piston and first and second elements of magnetic material with a shaft extending therebetween. The piston and shaft are linearly movable relative to one another upon application of forces to the damping apparatus. The shaft is spaced from an axial bore of the piston by a restrictive fluid flow annulus that is filled with a viscous fluid. A resilient seal mechanism, having a static stiffness, couples the first and second elements to the piston to define first and second viscous fluid filled chambers in fluid communication with the annulus. Shearing of the fluid as it is displaced through the annulus dissipates the forces. A magnetic mechanism generates magnetic forces that act on the first and second elements to destiffen the static stiffness of the resilient seal mechanism to improve vibration damping and isolation at low frequencies.

대표청구항 ▼

[ What is claimed is:] [1.] A structural apparatus, comprising:a passive damping mechanism, including:a first element of magnetic material;a second element of magnetic material;a shaft extending between the first and second elements;a piston having an axial bore coaxially positioned with respect to

[ What is claimed is:] [1.] A structural apparatus, comprising:a passive damping mechanism, including:a first element of magnetic material;a second element of magnetic material;a shaft extending between the first and second elements;a piston having an axial bore coaxially positioned with respect to the shaft, the piston and shaft being linearly movable relative to one another upon application of forces to the structural apparatus, the shaft being spaced from the axial bore of the piston by a restrictive fluid flow annulus;resilient seal means having a static stiffness, the resilient seal means coupling each of the first and second elements to the piston to define first and second fluid chambers in fluid communication with restrictive fluid flow annulus;a viscous fluid filling the first and second chambers and the restrictive fluid flow annulus, the viscous fluid dissipating the forces via shearing of the viscous fluid as the fluid is displaced through the restrictive fluid flow annulus upon relative linear movement of the piston and shaft; andmagnetic means for generating magnetic forces which interact with the first and second elements to destiffen the static stiffness of the resilient seal means.