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

Seogju Cha, Sung Soo Na

Research output: Contribution to journalArticle

Abstract

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
Volume138
Issue number7
DOIs
Publication statusPublished - 2016 Jul 1

Fingerprint

Turbogenerators
Stators
Steam
Rotors
Bearings (structural)
Modal analysis
Repair
Personnel
Engineers
Costs

Keywords

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

ASJC Scopus subject areas

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

Cite this

Physical Analysis of Rotor-to-Stator Rub in a Large-Capacity Low-Pressure Steam Turbogenerator. / Cha, Seogju; Na, Sung Soo.

In: Journal of Engineering for Gas Turbines and Power, Vol. 138, No. 7, 072605, 01.07.2016.

Research output: Contribution to journalArticle

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