High Speed Electrical Machinery Windage In 2012, Xdot Engineering and Analysis completed a Phase I/Phase II SBIR effort funded by the US Air Force. This goal of the project was to develop methods of reducing windage loss in high speed electrical machinery in the range of 50 kW to 200 kW. The project consisted of…

In early 2018, Xdot was awarded a two-year, $749,882 Phase II STTR contract from the US Navy to continue subscale testing and development of a water lubricated bearing software analysis tool.

Evolution And Trend Of API 617 Compressor Rotordynamic Criteria Pettinato, B.C., Kocur, J.A., Swanson, E.E., 2011 Turbomachinery, Transactions of the Turbomachinery Society of Japan Abstract This paper traces the history of the American Petroleum Institute acceptance standards for compressor machinery dynamics. This examination starts with the 1st edition of the API 617 standard published in…

Rotordynamic Design Audits Of AMB Supported Machinery Swanson, E.E., Maslen, E.H., Li, G., Cloud, C.H., 2008 Proceedings of the Thirty-Seventh Turbomachinery Symposium, Turbomachinery Laboratory, Texas A&M University, College Station, Texas Abstract Active Magnetic Bearings (AMBs) are a mature bearing technology that is being applied to many new turbomachines. They have become the bearing of choice…

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,…