The oil provides soft bearing support for, and viscous damping of, the rotor (132) by squeeze film damping.

An elastic fluid filled impact absorber, that incorporates permeable barriers, to provide viscous damping.

A viscous magnetic fluid is held in the gaps by the magnetic fields and provides viscous damping of relative angular movement between the members.

Study of the influence of viscous damping on fiber vibrations of a simple spring / mass / damper system.

The gas flow within the tube resulting from such movement is restricted by the cushioning layer (11) for viscous damping of the plate-movement.

In some embodiments, there is also a piston providing viscous damping, in some embodiments, the shaft of the damper telescopes with an internal shaft.

Furthermore, movement velocity, thickness, strain, elastic stiffness, and viscous damping of the object or regions of the object can be determined subsequently.

Tangential grooves (36) may be provided on the centering support outer bumpers (32) to allow oil to squeeze out when the centering support is deflected to provide additional viscous damping.

A tangential groove (46) in the outer bumper (43) allows oil passage during ring deflection so that oil can be squeezed out under dynamic load, providing additional viscous damping to the rotor (21).

This generalization allows to take into account all the issues proposed by the modal code: widespread problems (GEP) and quadratic (QEP) with hysteretic or viscous damping, gyroscopic effect …