Modeling the Lateral Vibration of Hydraulic Turbine-Generator Rotors

[+] Author and Article Information
B. P. Bettig

Department of Mechanical & Aerospace Engineering, Arizona State University, Tempe AZ 85287-6106

R. P. S. Han

Department of Mechanical Engineering & The Center for Computer-Aided Design, The University of Iowa, Iowa City, IA 52242-1527

J. Vib. Acoust 121(3), 322-327 (Jul 01, 1999) (6 pages) doi:10.1115/1.2893983 History: Received September 01, 1998; Revised January 01, 1999; Online February 26, 2008


An extensive hydro-generator rotordynamic model is presented along with a technique for determining imbalances and shaft misalignments using the model and mechanical run vibration measurements. The hydro-generator model combines a finite element rotor model with a finite difference guide bearing model, generator magnetic forces and turbine hydraulic forces to calculate natural frequencies, stability and steady-state response. The complete model allows a great number of inputs including imbalances, rotation speed, guide bearing misalignments, coupling misalignments, bearing clearances, bearing temperatures, generator stator and rotor center misalignments, generator average air gap, generator power output and turbine blade tip clearance, all of which are described in this paper. Finally, the numerical results are compared with vibration data from the mechanical run and load test of an actual hydro generator unit.

Copyright © 1999 by The American Society of Mechanical Engineers
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