Physical Analysis of Rotor-to-Stator Rub in a Large-Capacity Low-Pressure Steam Turbogenerator

Seogju Cha, Sungsoo Na

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Excessive vibration in large-capacity turbine generators can lead to expensive repairs and downtime with associated loss of operational income. Therefore, it is vital to detect the rubbing location in the rotor system at an early stage. The challenge is in achieving this without the expense and labor of complete disassembly. In this study, we present a practical tool for estimating the rubbing locations in a large-capacity rotor system from the shaft vibration patterns at each bearing. The measurement and analysis were performed on the rotor system of an 800-MW class large-capacity turbine generator. Three vibration patterns were observed in the machine operating on-site and were explained in terms of vibration modal analysis and the unbalance response characteristics to identify the rubbing locations. These results will be of interest to industrial engineers and have the potential to increase savings in operation costs.

Original languageEnglish
Article number072605
JournalJournal of Engineering for Gas Turbines and Power
Issue number7
Publication statusPublished - 2016 Jul 1

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program, through the National Research Foundation of Korea (NRF) and funded by the Ministry of Science, ICT and Future Planning (MSIP) (No. 2007-0056094).

Publisher Copyright:
Copyright © 2016 by ASME.


  • low-pressure turbine
  • rubbing vibration
  • rubbing vibration pattern
  • shaft unbalance
  • turbine rotor system
  • vibration mode
  • vibration response

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Fuel Technology
  • Aerospace Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering


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