Optimum Design of Journal Bearings Dimensions for Rotating Machines | ||
| Engineering and Technology Journal | ||
| Article 8, Volume 38, 10A, October 2020, Pages 1481-1488 PDF (1.33 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.30684/etj.v38i10A.1093 | ||
| Authors | ||
| Tariq M. Hammza* 1; Ehab N. Abas2; Nassear R. Hmoad3 | ||
| 1University of technology, Electromechanical Engineering Department, Baghdad, Iraq, | ||
| 2Ministry of Higher Education and Scientific Research, Studies and Planning and Follow up Directorate, | ||
| 3University of Baghdad, College of Engineering, Aeronautical Engineering Department, Baghdad, Iraq, | ||
| Abstract | ||
| The values of Many parameters which involve in the design of fluid film journal bearings mainly depend on the bearing applied load when using the conventional design method to design the journal bearings, in this study, as well as applied bearing load, the dynamic response and critical speed have been used to calculate the dimensions of journal bearings. In the field of rotating machine, especially a heavy-duty rotating machines, the critical speed and response are the main parameters that specify bearing dimensions. The bearing aspect ratio (bearing length to bore diameter) and bearing clearance have been determined based on rotor maximum critical speed and minimum response displacement. The analytical solution of rotor Eq. of motion was verified by numerical solution via using ANSYS Mechanical APDL 18.0 and by comparing the numerical solution with the preceding study. The final study results clearly showed that the bearing aspect ratio has little effect on the critical speed, but it has a high effect on the dynamic response also the bearing clearance has little effect on the critical speed and considerable effect on the dynamic response. The study showed that the more accurate values of bearing aspect ratio to make the response of rotor as low as possible are about 0.65 - 1 and bearing percent clearance is about 0.15 - 0.2 for different rotor dimensions. | ||
| Keywords | ||
| ANSYS; Critical speed; Dynamic response; Journal bearing; Rotor | ||
| References | ||
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[1] L. S., Andres, “Dynamics of a rigid rotor-fluid film bearing system,” Notes 5 – Modern lubrication, 2010. [2] L. A., Maurice, “Rotating machinery vibration: from analysis to trouble shooting, “Taylor and Francis Group, LLC, 2010. [3] J.S., Rao, “History of Rotating Machinery Dynamics,” Springer, 2011. [4] H. Reinhard and W. Nils,“ Application of optimization methods in rotor dynamics,” 9th IFToMM International Conference on Rotor Dynamics, September 22 - 25, 2014; Polytechnics Milano, Milan, Italy, 2014. [5] S. Hamit, R.E. Keith and R.A. Carlo,” Design optimization of tilting-pad journal bearing using a genetic algorithm,” International Journal of Rotating Machinery, 10(4): 301–307,2004, Taylor & Francis Inc. ISSN: 1023-621X print / 1542-3034, DOI: 10.1080/10236210490447746, 2004. [6] M. Leonid, R. Leonid, K. Roman and K. Evgen, “Hydrodynamic journal bearings optimization considering rotor dynamics restrictions,” Proceedings of ASME Turbo Expo2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, GT2018-75790, 2018. [7] H. Satoshi, Y. Satoru, K. Ryou, S.Yuichi, I. Kyoichi, “Measurement of dynamic performance of large tilting pad journal bearing and rotor stability improvement,” thirty-ninth Turbomachinery symposium proceedings: October 4-7, 2010: George R. Brown Convention Center, Houston, Texas, 2010. [8] R. Stocki, T.Szolc, P.Tauzowski, J. Knabel, “Robust design optimization of the vibrating rotor-shaft system subjected to selected dynamic constraints,” Mechanical system and signal processing ,Vol. 29, May 2012, Pages 34-44, Elsevier, 2012. [9] L.L. Zi, Z. Qin, C.B. Yan, X. Qi, Y.L. Hong, W.C. Bang, “Parameter optimization design of rotor dynamic vibration absorber,” Journal of Vibro Engineering, March 2019, Vol. 21, Issue 2, DOI https://doi.org/10.21595/jve.2018.19688, ISSN PRINT 1392- 8716, ISSN ONLINE 2538-8460, KAUNAS, LITHUANIA, 2019. [10] J. Training guide for Wassit power plant 4x330MW subcritical oil/gas-fired unit, turbine equipment and operation, shanghai electric company may 2012. [11] F.I. Michael, P.E.T. John, G.D. Seamus, L.E. Arthur, “Dynamics of rotating machines,” Cambridge University Press, 2010. [12] D. Srikrishnanivas, “Rotor Dynamic Analysis of RM12 Jet Engine Rotor Using ANSY,” Thesis Submitted for Completion of Master of Science in Mechanical Engineering with Emphasis on Structural Mechanics at the Department of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, Sweden, 2012. | ||
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