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RESEARCH PAPERS: Rotor Dynamics

Dynamic Analysis of Centrifugal Pump Rotors With Fluid-Mechanical Interactions

[+] Author and Article Information
W. Diewald, R. Nordmann

University of Kaiserslautern, 6750 Kaiserslautern, Federal Republic of Germany

J. Vib., Acoust., Stress, and Reliab 111(4), 370-378 (Oct 01, 1989) (9 pages) doi:10.1115/1.3269871 History: Received January 21, 1988; Online November 23, 2009

Abstract

Calculating bending vibrations of centrifugal pump rotors, stability and unbalance response are of major interest. In order to predict the dynamic behavior accurately, one has to take into account the coupling mechanisms between the vibrating shaft and the surrounding fluid. This paper presents a finite-element procedure which includes the fluid forces arising from journal bearings, seals, balance pistons and impeller interactions to the dynamic calculations of turbopumps. The theoretical background is briefly explained and a simple Jeffcott rotor is used to show several effects of these fluid forces. Finally, a real multistage boiler feed pump is calculated and discussed.

Copyright © 1989 by ASME
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