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http://dx.doi.org/10.7735/ksmte.2015.24.4.463

Investigation of the Cause of High Vibration in a Low Pressure Turbine Casing with Manufacturing Defects by Frequency Response Analysis  

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.)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.24, no.4, 2015 , pp. 463-468 More about this Journal
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
Turbine casing; Finite element method (FEM); Modal analysis; Frequency response; Casing resonance; Solid modeling;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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