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About Dr. Swanson
Dr. Erik Swanson, P.E. is
the president and founder of Xdot Engineering and Analysis. He
specializes in
rotating machinery component and system test rigs, rotor dynamics, data
acquisition, instrumentation, proposal development and technical
programming. He has been actively working in the area of rotating
machinery since 1990, with an emphasis on experimental work. He
received his B.S., M.S., and Ph.D. in mechanical engineering from
Virginia Tech. Prior to founding his own company, he
worked at Mohawk Innovative Technology, Inc. (MiTi®), where he was
the manager of the Department of Machinery Dynamics and Tribology.
Selected Xdot external projects include:
- Rotordynamic analysis of small, high speed
turbine
driving synchronous generator through a planetary gearbox. Analysis
included development and
implementation of method to account for coupling through planetary
gears.
- Design review and test support for small, advanced,
high speed, foil bearing turbomachine.
- Rotordynamics analysis (lateral,
torsional, axial)
in support of a new high speed centrifuge
development project.
- Lateral rotordynamic analysis for coupled lateral
vibrations of gas turbine/coupling/gear train and analysis of revised
bearing
configuration to improved critical speed separation margin.
- Lateral rotordynamic analysis of large industrial
fans in support of field troubleshooting efforts.
- Torsional analysis of turbine driven pump.
- Lateral and torsional analysis of vertical pump.
- Field data collection and reduction of results for
ranking vibration severity of 28 turbomolecular vacuum pumps for major
domestic
manufacturer.
- Rotordynamic
design
audit of a LP turbine upgrade for a 1200 MW steam-turbine
generator. This extensive evaluation project included static
loading due to alignment, lateral dynamics, torsional dynamics
(including coupling with LP blading) and blade-loss dynamics.
Selected Xdot internal research projects include
- Development of a finite element based hydrodynamic
bearing analysis tool, and use of this tool to investigate several
approaches to shape optimization of fixed geometry bearings for
enhanced stability and rotor dynamic performance
- Investigations into ways to model the dynamics of
bump foils to allow prediction of bump foil equivalent stiffness and
damping for foil bearings and foil dampers
- Development of a Matlab/Octave based tool suite for
use with Dyrobes to automate and extend Dyrobes capabilities
While at MiTi®, Dr. Swanson was a program manager for a number of
programs, including ten Small Business Innovative Research (SBIR)
programs, and two commercial projects. He was the principle
investigator for two of the Phase SBIR I programs. Some outcomes
from these projects include:
- Demonstration of the rotor-bearing system for the
world’s first totally oil-free, high speed (70,000+ RPM) plant
air
compressor supported on foil bearings and operating above the first
bending critical speed
- The development of a 60,000 RPM capable foil bearing
dynamic characterization test stand using a magnetic bearing
loader/exciter
- Demonstrations of an advanced backup bearing system
(the Zero Clearance Auxiliary Bearing) ranging from the sole shaft
support of a 24 pound rotor at 60,000 RPM, to a 1000 pound capable
bearing at 18,000 RPM
- Demonstrations of foil-magnetic bearing shaft support
systems as a hybrid system, and as a fault tolerant system in case of
failure of the active magnetic bearing
- Demonstration of a foil bearing supporting close to
1000 pounds of applied load at 22,000 RPM
Dr. Swanson’s background and interests also include signal processing,
modal/vibration analysis, machinery troubleshooting, control systems,
as
well as teaching. He is a member of ASME, STLE, Sigma Xi, Tau
Beta
Pi, and Pi Tau Sigma. He has served as a session co-organizer for
the ASME Vibrations Conference, a session chair for the ASME Vibrations
Conference, the AMSE/STLE Joint Tribology Conference and the
International Modal Analysis Conference, and a paper review for both
ASME and STLE. He was a NASA Graduate Research fellowship
recipient, and has passed the Virginia Engineer-In-Training exam.
He has 28 publications, as well as one patent.. He is
licensed as a Professional Engineer in the states of North Carolina and
Virginia.
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Publications, Patents
Chen, H.M.,
Swanson, E.E., Walter, T.J. 2006, "Rotordynamic Considerations For
Foil-Bearing-Supported Rotors Operating Above A Bending Critical
Speed." International Joint Tribology Conference, Paper IJTC2006-12118.
Kirk,
R.G., Raju,
K.V.S., Swanson, E.E., 1996, "Evaluation of AMB Turbomachinery
Auxiliary
Bearings." Proc Fifth Colloquium on Turbomachinery, Turbo and Power
Machinery Research Center, Seoul National University, Seoul, Korea, May
6-11.
Kirk, R.G., Swanson,
E.E., Kavarana, F.H., Wang, X., 1994, "Rotor Drop Test Stand for AMB
Rotating
Machinery, Part I: Description of Test Stand and Initial Results."
Proc.
of Fourth International Symposium on Magnetic Bearings, Zurich, pp.
207-212.
Locke, D., Swanson, E.,
Walton, J., Willis, J.P., Heshmat,
H., 2003, “Testing of a Centrifugal Blood
Pump with a High Efficiency Hybrid Magnetic Bearing.” ASAIO Journal,
49, pp.
737-743.
Pulitzer,
S.W., Swanson, E.E., and Heshmat, H., 2002, “Demonstration of Powder
Shear
Damping Applied to Plates.” Boundary and Mixed Lubrication: Science and
Applications D. Dowson, et. al. (eds), Elsevier Science B.V. pp.
547-553.
Raju, K.V.S., Ramesh,
K.,
Swanson, E.E., Kirk, R.G., 1995, "Simulation of AMB Turbomachinery for
Transient Loading Conditions." Proc. MAG '95, pp. 227-235.
Salehi,
M., Swanson, E., and Heshmat, H., 2001, “Thermal Features
of Compliant Foil Bearings - Theory and Experiments.” ASME
Journal of Tribology, 123, pp. 566-571.
Swanson, E.E.,
"Bump Foil Damping Using a Simplified Model." 2006, ASME Journal of
Tribology, vol
128, pp. 542-550.
Swanson,
E.E., Powell, C.D., Weissman, S., 2005, “A Practical Review of Rotating
Machinery Critical Speeds and Modes.” Sound and Vibration, May,
pp. 10-17.
Swanson, E.E.,
"Fixed-Geometry, Hydrodynamic Bearing with Enhanced Stability
Characteristics." 2005, Tribology Transactions, 48, pp. 82-92.
Swanson, E.E.,
and
Pulitzer, S.W. III, “Generalized Entities: A Modern Framework for Rotor
Dynamics Software.” 2002, Presented at the 2002 IFToMM Sixth
International Conference on Rotor Dynamics.
Swanson, E.E.,
Heshmat, H., Shin, J.S., 2002, “The Role of High Performance Foil
Bearings in
an Advanced, Oil-Free, Integral Permanent Magnet Motor Driven,
High-Speed Turbo-Compressor Operating Above The First Bending Critical
Speed.” ASME paper GT-2002-30579.
Swanson, E.E.,
Heshmat, H., 2002, “Oil-Free Foil Bearings as a Reliable, High
Performance
Backup Bearing for Active Magnetic Bearings.” ASME Paper GT-2002-30291.
Swanson,
E.E., Walton, J.F., II, Heshmat, H., 2002, “A Test Stand for Dynamic
Characterization of Oil-Free Bearings for Modern Gas Turbine Engines.”
ASME Paper GT-2002-30005.
Swanson,
E.E., Heshmat, H., Walton, J.F. II, 2002, “Performance of a
Foil-Magnetic
Hybrid Bearing.” ASME Journal of Engineering for Gas Turbine and
Power, 124, 2002, pp. 375-382.
Swanson,
E.E., Walton, J.F. II, Heshmat, H., 2000, “A Gas Turbine Engine Backup
Bearing
Operating Beyond 2.5 Million DN.” ASME Paper 2000-GT-622.
Swanson, E.E.,
Heshmat, H.,2000, “Capabilities of Large Foil Bearings.” ASME Paper
2000-GT-387.
Swanson, E.E., Xu,
D.S., Russell, T.E., Walton, J.F. II, Heshmat, H., 2000, “On The
Application
of Powder Shear Damping to a Structural Element.” ASME Paper
2000-GT-0365.
Swanson, E.E.,
Heshmat, H., 1999, “The Integration of Structural and Fluid-Film
Dynamic
Elements in Foil Bearings Part II: A New Approach to the Problem.”
Proc.
1999 ASME Design Engineering Technical Conference, Paper
DETC/VIB-8270.
Swanson,
E.E., Walton, J.F. II, Heshmat, H., 1999, “A 35,000 RPM Test Rig for
Magnetic,
Hybrid and Back-Up Bearings.” ASME Paper 99-GT-180.
Swanson, E.E., Kirk,
R.G., 1999, “Bearing Test Rig Dynamics Problem Identification and Model
Tuning.” Proc. IMAC XVII, SEM, pp. 270-276.
Swanson, E.E., Kirk,
R.G., 1997, "Survey of Experimental Data for Fixed Geometry
Hydrodynamic
Journal Bearings." ASME Journal of Tribology, 119, pp.704-710.
Swanson, E.E.,
Raju, K.V.S., Kirk, R.G., 1996, "Test Results and Numerical Simulation
of AMB
Rotor Drop." Proc. 6th Int'l Conf. on Vibrations in Rotating Mach.,
IMechE, pp. 119-131.
Swanson, E.E., Kirk,
R.G., 1995, "AMB Rotor Drop Initial Transient on Ball and Solid
Bearings."
Proc. MAG '95, pp. 227-235.
Swanson, E.E., Kirk,
R.G., 1995, "Experimental Temperature and Pressure Profiles for Two
Steadily
Loaded Journal Bearings." Tribology Transactions, 38, pp. 601-606.
Swanson, E.E., Kirk,
R.G., 1994, "An Experimental Comparison of Two Steadily Loaded Plain
Journal
Bearings." Tribology Transactions, 37, pp. 843-849.
Swanson, E.E.,
Kirk, R.G., Mondy, R.E., 1992, "An Examination and Comparison of the
Maximum
Film Temperatures in a Journal Bearing for 13 Synthetic, Mineral and
Viscosity Index Enhanced Oils." Rheology and Tribology of Engine Oils,
SAE SP-936, Society of Automotive Engineers, Warrendale, pp.
137-145.
Swanson, E.E., Kirk,
R.G., 1992, "Experimental Evaluation of Fluid-Film Bearings Using
Electro-Magnetic Shaft Loading and Evidence of Localized Thermal
Distortion." Proc. 5th Int'l Conf. on Vibrations in Rotating Mach.,
IMechE, pp. 359-363.
ME4005 - Undergraduate Lab Manual, VA Tech Mechanical Engineering Dept.
(initial development and concept based on labs taught in previous years
and new labs).
Hybrid Foil-Magnetic Bearing with Improved Load Sharing, US patent
6770993
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