Rotordynamic Considerations For Foil-Bearing-Supported Rotors Operating Above A Bending Critical Speed Chen, H.M., Swanson, E.E., Walter, T.J., 2006 International Joint Tribology Conference, Paper IJTC2006-12118. Abstract In meeting goals for higher energy density and efficiency for micro-turbomachinery, there is a trend towards higher operating speeds. Gas-lubricated foil bearings historically have provided a key enabling technology for…

Bump Foil Damping Using A Simplified Model Swanson, E.E., 2006 ASME Journal of Tribology Abstract Foil bearings are a key enabling technology for advanced and oil-free rotating machinery. In certain applications, they provide a level of performance that is difficult or impossible to match with other technologies. A number of reasonably successful analytical techniques to…

A Practical Review Of Rotating Machinery Critical Speeds And Modes Swanson, E.E., Powell, C.D., Weissman, S., 2005 Sound and Vibration, May, pp. 10-17. Abstract The goal of this article is to present a practical understanding of terminology and behavior based in visualizing how a shaft vibrates, and examining issues that affect vibration. It is hoped…

Fixed-Geometry, Hydrodynamic Bearing With Enhanced Stability Characteristics Swanson, E.E., 2005 Tribology Transactions, 48, pp. 82-92. Abstract This article presents the results of a successful bearing optimization study aimed at identifying a fixed-geometry, hydrodynamic journal bearing that does not suffer from the low load instability typical of this class of bearings. This goal was met through…

Testing Of A Centrifugal Blood Pump With A High Efficiency Hybrid Magnetic Bearing Locke, D., Swanson, E., Walton, J., Willis, J.P., Heshmat, H., 2003 ASAIO Journal, 49, pp. 737-743. Abstract The purpose of this article is to present test results for a second generation, high efficiency, nonpulsatile centrifugal blood pump that is being developed for…

Swanson, E.E., Heshmat, H., Shin, J.S., 2002 ASME paper GT-2002-30579. Abstract The demand for high power density, reliable, low maintenance, oil-free turbomachinery imposes significant demands on the bearing system.  The full benefits of high speed, permanent magnet driven machines, for example are realized at speeds exceeding the capabilities of rolling element bearings.  The high speeds,…

Performance Of A Foil-Magnetic Hybrid Bearing Swanson, E.E., Heshmat, H., Walton, J.F. II, 2002 ASME Journal of Engineering for Gas Turbine and Power, 124, 2002, pp. 375-382. Abstract To meet the advanced bearing needs of modern turbomachinery, a hybrid foil-magnetic hybrid bearing system was designed, fabricated and tested in a test rig designed to simulate…

Oil-Free Foil Bearings As A Reliable, High Performance Backup Bearing For Active Magnetic Bearings Swanson, E.E., Heshmat, H., 2002 ASME Paper GT-2002-30291. Abstract Gas turbine engines and other high speed rotating machinery supported by magnetic bearings require some form of backup bearing to ensure reliable and safe operation. To date, this backup capability has been…

Generalized Entities: A Modern Framework For Rotor Dynamics Software Swanson, E.E., and Pulitzer, S.W. III, 2002 Presented at the 2002 IFToMM Sixth International Conference on Rotor Dynamics. Abstract Traditionally, the organization of the data for rotor dynamics software has been centered about the needs of the analysis routines. This paper offers a new approach based…

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…