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http://dx.doi.org/10.9725/kstle.2013.29.6.386

Design Analysis to Enhance Rotordynamic Stability of High-Speed Lightweight Centrifugal Compressor - Part I: Effects of Bearing Designs  

Lee, An Sung (Dept. of System Dynamics Research, Mechanical Systems Research Div. Korea Inst. of Machinery and Materials)
Publication Information
Tribology and Lubricants / v.29, no.6, 2013 , pp. 386-391 More about this Journal
Abstract
Part I of this study analyzed the effects of tilting pad bearing designs to reduce the stiffness of the bearings used in a process high-speed lightweight centrifugal compressor intended for a domestic refinery use. This was done in an attempt to enhance the robustness of its rotordynamic stability against possible aerodynamic cross-coupled stiffness. The bearing design variables reviewed were the clearances, LBPs, LOPs, and preloads. The results showed that there was practically no difference between the LBP and LOP designs in terms of the bearing stiffness, because the compressor rotor was lightweight and the bearings had relatively high preloads. Increasing both the machined and assembled clearances in bearing designs has resulted in the bearing stiffness being greatly reduced. In addition, it has been confirmed that an additional reduction in the bearing stiffness can be obtained for given fixed machined clearances by decreasing the preloads, i.e., by increasing the assembled clearances.
Keywords
process compressor; rotordynamic stability; effects of bearing design; tilting pad bearing; reducing bearing stiffness; bearing clearance;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Nicholas, J. C., "Tilting Pad Bearing Design," Proceedings of the 23rd Turbomachinery Symposium, pp. 179-194, 1994.
2 API Recommended Practice 684, API Standard Paragraph Rotordynamic Tutorial: Lateral Critical Speeds, Unbalance Response, Stability, Train Torsionals, and Rotor Balancing, Chap. 2 & 3, 2005.
3 Nicholas, J. C., Gunter, E. J., and Barrett, L. E., "The Influence of Tilting Pad Bearing Characteristics on the Stability of High Speed Rotor-Bearing Systems," Topics in Fluid Film Bearing and Rotor Bearing System Design and Optimization, ASME, pp. 55-78, 1978.
4 Kocur, J. A., Nicholas, J. C., and Chester, C. L., "Surveying Tilting Pad Journal Bearing and Gas Labyrinth Seal Coefficients and their Effect on Rotor Stability," Proceedings of the 23rd Turbomachinery Symposium, 2007.
5 Kocur, J. A., and Nicholas, J. C., 2007, "Rotordynamic Lateral and Stability Analyses for Equipment Reliability," 36th Turbomachinery Syposium Short Course.
6 Lee, A. S., "Journal Bearing Design Retrofit for Process Large Motor-Generator - Part I: Bearing Performance Analysis," Journal of the KSTLE, Vol. 28, No. 5, pp. 197-202, 2012.   과학기술학회마을   DOI   ScienceOn
7 Lee, A. S., "Journal Bearing Design Retrofit for Process Large Motor-Generator - Part II: Rotordynamics Analysis," Journal of the KSTLE, Vol. 28, No. 6, pp. 265-271, 2012.   과학기술학회마을   DOI   ScienceOn
8 Lee, A. S., "Design Analysis for Enhancing the Rotordynamic Stability of High-Speed Light-Weight Process Compressor - Part II: Improvements of Rotordynamic Stability," Submitted for publication in the Journal of the KSTLE, 2013.