We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Rotordynamic analysis and operation test of the power turbine with the concept of the Lee diagram.
- Authors
Lee, Donghyun; Seo, Yun-Ho; Lim, Hyungsoo; Seo, Jongho
- Abstract
Rotordynamic analysis in complex coordinates has many advantages. Especially, the Lee diagram, with the concept of the infinity norm in directional frequency response matrix, can an effective design tool for rotating machinery, because the severity of the mode is clearly identified, and it also includes the concept of the worst case response prediction. However, it is not widely used in the field because most of the previous studies and commercial software are based on the real coordinate system. Our objective was to apply the Lee diagram to analyze rotordyanmic characteristics of the power turbine, which is a typical example of turbomachinery. We show that this could be a useful design tool for rotating machinery. The power turbine in this study was used for the super critical carbon dioxide power generation system and the rotor was supported by tilting pad bearings. The equation of motion of the rotor and bearing system was derived in the complex coordinate system. The Lee diagram was calculated with the concept of the infinity norm and unbalance response was predicted. The operation test of the power turbine was done with compressed air, and the rotor vibration was measured with the proximity probes. The results of the analysis show that the resonance speed can be effectively estimated with the Lee diagram and the degree of the anisotropy of the system can be identified. The operation test was done successfully and the measured maximum rotor vibration was about 5 μm. In addition, the measured rotor vibration shows that the anisotropy of the power turbine is very small as predicted, and the predicted vibration amplitude shows good agreement with the test data.
- Subjects
EQUATIONS of motion; ROTOR vibration; TURBINES; COORDINATES; CHARTS, diagrams, etc.; ROTATING machinery
- Publication
Journal of Mechanical Science & Technology, 2019, Vol 33, Issue 9, p4183
- ISSN
1738-494X
- Publication type
Article
- DOI
10.1007/s12206-019-0813-0