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http://dx.doi.org/10.5050/KSNVN.2004.14.8.684

A Study on the Identifying Dynamic Characteristic Parameters of Rotor-bearing Systems Using Field Measurement Data of Unbalance Responses  

이동환 (한국기계연구원 구조연구부 회전체그룹)
박노길 (부산대학교 기계공학)
김영일 (한국기계연구원 구조연구부 회전체그)
이형우 (부산대학교 기계기술연구소)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.14, no.8, 2004 , pp. 684-694 More about this Journal
Abstract
Presented in this dissertation is a new method of identifying the critical speed of rotor-bearing systems without actually reaching at the critical speed itself. Using the method, it is possible to calculate the critical speed by measuring a series of rotor responses at much lower rotating speeds away from and without reaching at the critical speed of the system. In the course of the procedures illustrated, not only the critical speed but also the damping ratio and the eccentricity of the system can be identified at the same time. Test rotor was tested on the Rotor Dynamics Test Facility at the Korea Institute of Machinery ＆ Materials. Korea, and the theory has been confirmed experimentally. The method can be adopted to monitor changes of the dynamic characteristics of critical rotating machinery before and after overhauls, repairs, exchanges of various parts, or to detect trends or direction of subtle changes in the dynamic characteristic parameters over a long periods of time.
Keywords
Critical Speed; Damping Ratio; Eccentricity; Identification;
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  • Reference
1 Lee, C. -W. and Jei, Y.-G., 1988. "Modal Analysis of Continuous Rotor-Bearing Systems," J. Sound and Vibration, Vol. 126, No.2, pp. 345-361.   DOI   ScienceOn
2 Marscher, W. D., 1986, "Determination of Pump Rotor Critical Speeds During Operation Through Use of Modal Analysis," Proc, ASME, 1986 WAM, pp. 71-78.
3 Jeffcott, H. H., 1919, "The Lateral Vibration of Loaded Shafts in the Neighbourhood of a Whirling Speed - The Effect of Balance," Philosophical Magazine and Journal of Science, Vol. 37. Series 6, pp. 304-314.   DOI
4 Ewins, D. J., 1984, "Modal Testing: Theory and Practice," Research Studies Press Wiley.
5 Ehich, F. F., 1992, "Handbook of Rotor dynamics," McGraw-Hill. Inc., pp. 423-433.
6 Rieger, N. F., 1982, "Vibrations of Rotating Machinery, Part I: Rotor-bearing Dynamics," Vibration Institute, Clarendon Hills, Ill.
7 Eshleman, R. L., "Flexible Rotor-Bearing System Dynamics-I, Critical Speeds and Response of Flexible Rotor System," The Flexible Rotor Systems Subcommittee, The Engineering Division, ASME.
8 Shapiro, W. and Rumbarger, J. H., "Flexible Rotor-Bearing System Dynamics-II. Bearing Influence and Representation in Rotor Dynamic Analysis," The Flexible Rotor Systems Subcommittee, The Engineering Division, ASME.
9 Zenetta, G. A., 1992, "Identification Methods in the Dynamics of Turbo Generator Rotor," Proceedings of the Institute of Mechanical Engineering, July, pp 173-182.
10 Subbiah, R., Bhat, R. B. and Sankar, T. S., "Determination of Modal Parameters of Rotors Supported on Hydrodynamic Bearing Through Experimental Modal Analysis," pp. 1450 - 1456.
11 Marscher, W. D., 1989, "Analysis and Test of Multistage Pump 'Wet' Critical Speeds," STLE Preprint No. 89-TC-6E-1.
12 Li, H., Entwistle, R. D. and Stone, B. J., 1994, "Impact Excitation of Torsional Vibration," The International Journal of Analytical and Experimental Modal Analysis. Vol. 9. No.3, July, pp, 163-174.
13 ISO Standard, "Mechanical Vibration-Balancing Quality Requirements of Rigid Rotor." Ref. No. ISO 1940/1-1986(E), pp. 10-13.
14 Jen, C. -W. and Marscher, W. D., "Using Time-averaged Modal Excitation to Determine the Rotor Dynamic Bearing Coefficients of Centrifugal Pumps."
15 Birembaut, Y., Peigney, J., 1980, "Prediction of Dynamic Properties of Rotor Supported by Hydrodynamic Bearings Using the Finite Element Method," Computer & Structures, Vol. 12, pp. 483-496.   DOI   ScienceOn