Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Investigation of the Cause of High Vibration in a Low Pressure Turbine Casing with Manufacturing Defects by Frequency Response Analysis

주파수 응답해석을 통한 제작공차를 가지는 저압터빈 케이싱의 고진동 원인 규명

  • Youn, Hee-Chul (Department of Mechanical Engineering, Incheon Nat'l University) ;
  • Woo, Chang-Ki (Department of Mechanical Engineering, Incheon Nat'l University) ;
  • Hwang, Jai-Kon (GT Technology Service Center, KEPCO Plant Service & Engineering Co., Ltd.)
  • Received : 2015.04.30
  • Accepted : 2015.06.18
  • Published : 2015.08.15
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Abstract

High vibration of a low pressure (LP) turbine casing caused safety problems and life at the facility it was housed in. The main focus of this study was the cause of the high vibration in a low pressure turbine casing with manufacturing defects by frequency response analysis, compared with the results of experiments. Therefore, excited accelerations were obtained from the LP casing fundamental, and frequency responses were analyzed. The measurement and the modal analysis showed that the natural frequency of the LP turbine casing was 61.26 Hz and the excited frequency of the turbine rotor was 60.25 Hz. The manufacturing defect caused a decrease in the casing natural frequency and resulted in the high vibration of the casing because it moved close to the resonant frequency.

Keywords

References

  1. Shin, B. S., Choi, Y. S., 2011, Vibration Reduction of a LP Turbine Casing due to Subsidence, KSNVE Autumn Annual Conference, 384-389.
  2. Cho, C. W., Cho, S. T., Koo, J. R., Kim. H. S., 2013, Study on Vibration Characteristic of Low Pressure Turbine Hood Resonance in a 500MW tHermal Power Plant, KSPSE , 17:3 23-27.
  3. Cho, S. T., Cho, C. W., Bae, Y. C., Koo, J. R., Kim, D. Y., 2013, Investigation and Measure on High Vibration Phenomena of the Low Pressure Turbine Hood in the Combined Thermal Power Plant, KSNVE Spring Annual Conference, 186-187.
  4. Yi, J. H., Kim, D. H., Kwak, Y. S., Ryu, J. S., 2013, Dynamic Analysis of Low-pressure Steam Turbine Casing Using Multi-body Dynamics, KSME Spring Annual Conference, 238-239.
  5. Rao, S. S., 1990, Mechanical Vibrations,Wiley, Massachusetts, 138-175.

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