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Rotor Stability Evaluation for High Pressure Multi-Stage Pump by Excitation Diagnosis Method

[+] Author Affiliations
Shichao Peng, Akira Arai, Takaki Fukuchi, Taiju Katayama

Hitachi, Ltd., Tsuchiura-shi, Japan

Osami Matsushita

National Defense Academy, Yokosuka-shi, Japan

Paper No. FEDSM2017-69191, pp. V01AT05A014; 8 pages
  • ASME 2017 Fluids Engineering Division Summer Meeting
  • Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery
  • Waikoloa, Hawaii, USA, July 30–August 3, 2017
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5804-2
  • Copyright © 2017 by ASME


High pressure multi-stage pump is one of the most important machinery in various plants. Due to the high rotational speed, there are cases where excessive vibration problems occur. Especially, the self-excited vibration arises from the fluid force, which exists within the clearance of the oil film bearings and balancing drum (annular seal). In order to evaluate the rotor system stability, we developed an excitation method based on Bently-Muszynska model, and applied this method to the air test and water test. Through the test results, the onset (threshold) of instability (self-excited vibration) can be evaluated by the rotor system natural frequency and the fluid average angular circumferential velocity within the clearance of the bearings and balancing drum. Moreover, the balancing drum had a significant effect on the rotor stability, and the resulting frequency of the self-excited vibration matched the fluid average angular circumferential velocity in the balancing drum.

Copyright © 2017 by ASME



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