Demonstration Of Powder Shear Damping Applied To Plates Pulitzer, S.W., Swanson, E.E., and Heshmat, H., 2002 Boundary and Mixed Lubrication: Science and Applications D. Dowson, et. al. (eds), Elsevier Science B.V. pp. 547-553. Abstract Thin powder films have been proposed as a damping medium to overcome the thermal and frequency limitations of viscoelastic materials. In…

A Test Stand For Dynamic Characterization Of Oil-Free Bearings For Modern Gas Turbine Engines Swanson, E.E., Walton, J.F., II, Heshmat, H., 2002 ASME Paper GT-2002-30005. Abstract A multi-purpose rotor-bearing dynamic simulator was designed and fabricated for the purpose of experimentally evaluating and validating performance of advanced oil-free and back-up bearings under realistic dynamic conditions.  The…

Thermal Features Of Compliant Foil Bearings – Theory And Experiments Salehi, M., Swanson, E., and Heshmat, H., 2001 ASME Journal of Tribology, 123, pp. 566-571. Abstract The paper presents an analytical and experimental investigation aimed at eliciting the thermal characteristics of air lubricated compliant foil bearings. A Couette approximation to the energy equation is used…

On The Application Of Powder Shear Damping To A Structural Element Swanson, E.E., Xu, D.S., Russell, T.E., Walton, J.F. II, Heshmat, H., 2000 ASME Paper 2000-GT-0365. Abstract With the increasing demands placed on modern gas turbine components, improvements in high temperature compatible damping technology are required. The areas of application include turbine airfoils, struts, guide…

Capabilities Of Large Foil Bearings Swanson, E.E., Heshmat, H., 2000 ASME Paper 2000-GT-387. Abstract An experimental program was conducted on a large compliant surface foil bearing to document its performance.  This large single pad foil bearing is 100 mm in diameter, and was operated at speeds of up to 30,000 RPM.   Operation at 22,000 RPM…

A Gas Turbine Engine Backup Bearing Operating Beyond 2.5 Million DN Swanson, E.E., Walton, J.F. II, Heshmat, H., 2000 ASME Paper 2000-GT-622. Abstract Gas turbine engines and high speed rotating machinery using magnetic bearings require auxiliary and backup bearings for reliability and safety of operation. A 140 mm diameter Zero Clearance Auxiliary Bearing (ZCAB) capable…

The Integration Of Structural And Fluid-Film Dynamic Elements In Foil Bearings Part II: A New Approach To The Problem Swanson, E.E., Heshmat, H., 1999 Proc. 1999 ASME Design Engineering Technical Conference, Paper DETC/VIB-8270 Abstract In Part I of this investigation a survey was made to see how the two-tiered construction of foil bearings, consisting as…

Bearing Test Rig Dynamics Problem Identification And Model Tuning Swanson, E.E., Kirk, R.G., 1999 Proc. IMAC XVII, SEM, pp. 270-276. Abstract The experimental determination of the dynamic stiffness and damping for fluid-film bearings and seals is an increasingly important research subject in the area of rotating machinery design. During development testing of a new test…

A 35,000 RPM Test Rig For Magnetic, Hybrid And Back-Up Bearings Swanson, E.E., Walton, J.F. II, Heshmat, H., 1999 ASME Paper 99-GT-180 Abstract Magnetic bearings have long offered the potential for significant turbomachinery system improvements due to their oil-free, non-contact, low loss nature and their ability to actively control shaft dynamic motion. However, end-users and…

Survey Of Experimental Data For Fixed Geometry Hydrodynamic Journal Bearings Swanson, E.E., Kirk, R.G., 1997 ASME Journal of Tribology, 119, pp.704-710. Abstract An extensive survey of the experimental research on the static and/or dynamic characteristics of fixed geometry, hydrodynamic journal bearings available in English, in the open literature is presented.  The type(s) of bearing, size…