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 Copyright © 2012 by Turbomachinery Laboratory, Texas A&M University Proceedings of the Forty-First Turbomachinery Symposium September 24-27, 2012, Houston, Texas TORSIONAL NATURAL FREQUENCIES: MEASUREMENT VS. PREDICTION by Qingyu Wang Mechanical Engineer Elliott Group Jeannette, Pennsylvania Troy D. Feese Senior Project Engineer Engineering Dynamics Inc. San Antonio, Texas and Brian C. Pettinato Manager, Product Development Elliott Group Jeannette, Pennsylvania Qingyu Wang is a Mechanical Engineer at  Elliott Group in Jeannette, Pennsylvania.  He has been with Elliott Group since 2005.  His areas of expertise include lateral and torsional rotordynamics. He received his  B.S. and M.S. both in Mechanical  Engineering from Tsinghua University, 1997 and 2000 respectively. He received his Ph.D in Mechanical Engineering from the University of Virginia, 2008. He serves on the API 684 rotordynamics task force, and is a member of ASME. Troy Feese is a Senior Project Engineer at  Engineering Dynami cs I ncorporated (EDI) in San Antonio, Texas. He has 21 years of experience performing torsional vibration, lateral critical speed, and rotordynamic  stability analyses as well as evaluating  structures using finite element methods.  He conducts field studies of rotating machinery, reciprocating equipment,  piping, structures, and foundations. He is a lecturer at the annual EDI seminar and has published technical papers on torsional vibration, lateral critical speeds, and balancing. He received a BSME from The University of Texas at Austin and has a MSME from UTSA. He is a member of AS ME, Vibration Institute, contributed to API 684, was a speaker at  NPRA, and is a licensed Professional Engineer in Texas.  Brian C. Pettinato is Manager of Product  Development at Elliott Group in Jeannette,  Pennsylvania. He has been with Elliott Group since 1995. His areas of expertise include lateral and torsional rotordynamics, vibration analysis, and the testing and evaluation of fluid film journal bearings. He currently manages a group responsible for compressor and expander technology development. Prior to joining Elliott Group, Mr.  Pettinato worked as a project engineer for an aftermarket bearing manufacturer. Mr. Pettinato received his B.S. (Mechanical Engineering, 1989) and M.S. (Mechanical  Engineering, 1992) degrees from the University of Virginia. He has coauthored over ten technical papers, and holds one U.S.  patent. He is a registered Professional Engi neer in the State of  Pennsylvania. He serves on the API 684 rotordynamics task  force, and is a member of both ASME and STLE.

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