Static and dynamic characteristics of externally pressurized circular step thrust bearings lubricated with couple stress fluids

Experimental assessment of hydrostatic thrust bearing performance

This paper describes an experimental investigation into the dynamic stiffness characteristics of flat joints subjected to an alternating force superimposed on a steady pre-load. The joints consist of the interfaces between mild-steel discs arranged in a column, in sets with surfaces either turned or lapped together. The influences of pre-load and of alternating force frequency were investigated for both dry and oiled joints, for different values of surface finish, apparent joint area and oil viscosity. The ranges of the conditions considered are compatible with those existing in typical machine tool structures.It was found that the dynamic stiffness of dry joints is independent of frequency and no energy dissipation is measurable. The stiffness is primarily a function of pre-load and surface finish, with apparent joint area becoming important only for very good surface finishes.If oil is introduced into the joint interface, a quadrature stiffness component arises and is accompanied by an increase in the ‘...

http://journals.sagepub.com/doi/pdf/10.1243/PIME_CONF_1967_182_307_02

G.M. Brown

Papers

The dynamic characteristics of a hydrostatic thrust bearing