Main Article Content
Abstract
Bearing characteristics play a major role for dynamical analysis of rotor-disk system. The dynamic characteristics include such as, critical speed, dynamic response, perfect balancing, threshold speed of instability 6n4 selection of optimum as well as stable bearings for rotor dynamics. This work highlights the comparison of stability characteristics of any rotor-disk model mounted on various kinds of hydrodynamic journal bearings with different length/diameter ratios. The bearings which are considered in this work are; the two-axial groove bearing, the four-axial groove bearing, the elliptical bearing, the two lobe bearing, the three-Lobe bearing and the off-set cylindrical journal bearing with 0.5 and 1.0 as its Length to diameter ratio. From the analysis is observed that the off-set cylindrical journal bearing is more stabLe than other bearings for any rotor model within the operating speed range. A three disks-rotor-bearing model mounted on different hydrodynamic journal bearings has been used for its dynamical analysis by using transfer matrix method based on continuous system model.
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References
- Lund, J.W., "Rotor bearings Dynamic Technology, Part III", Design HandBook for Fluid Film Bearings, Mechanical Technology Inco., AFAPL-TI-65-45, I965.
- Lund, J.W. and Orcutt, F.K;, ,'Calculations and Experiments on the Unbalance Response of a Flexible Rotor", Journal of Engineering for Industry, Trans of ASME, Vol.89, pp.785-796, 1967.
- Lund, J.W., "Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings,', Journal of Engineering for Industry, Trans. Of ASME. Vol.96, pp.509-517, 191 4.
- Lund, J.W., "Modal Response of a Flexible Rotor in Fluid-Film Bearing", Journal of Engineering for Industry, Trans. of ASME, Vol.96, pp.525_533,1974.
- Lund, J.W., "A Calculation Method and Data for the Dynamic Coefficients of Oil Lubricated Journal Bearings", The Design Engineer.ing Conference, Chicago,Illinois, USA, pp. l-28, April, 1978.
- Someya, T., Journal-Bearing Data Book, Springer- Verlag, Berlin, 1988 7. Prabhu, B.S., "An Experimental Investigation on the Misalignment Effects in Journal Bearings',, Tribology Transactions, Vol.40, No.2, pp.235 _242, 1997 . 8. Maharathi, B.B. and Behera, A.K., ,,Dynamic Behaviour Analysis of Rotor-Bearing Systems by an Improved Transfer Matrix Method", Journal of Aeronautical Society of India, Vol.5l, No.2, pp.72_ 82,1999.
- Maharathi, B.B. and Behera, A.K., "parametric Study on Dynamic Behaviour of Rotor-Bearing Systems", Journal of Aeronautical Society of India, Vol.51, No.3, pp. 152-162, t999.
- Maharathi, B.B. and Behera, A.K., ,' A Transfer. Matrix Method for Dynamic Behaviour of Rotor-Bearing Systems", Journal of Aeronautical Society of India, Vol.5l, No.4, pp.2l4-224, 1999.
- Maharathi, B.B. and Behera, A.K., "Comparative Study ofUnbalance Response and Critical Speeds of Rotor-Bearing Systems". Journal of the Institution of Engineers (India), Vol.80, pp.95- 100, 1999.
- Maharathi, B.B. and Behera, A.K., ,,Effect of Disk Flexibility on Rotor Dynamics", Journal of Aeronautical Society of India, Vol.52, No.l, pp.9-18, 2000.
- Maharathi, B.B. and Behera, A.K., "Dynamic Behaviour Analysis of Continuous Rotor System", Journal of Structural Engineering (CSIR), India, Vol.28, No.2, pp.S1-88, 2001.
- Maharathi, B.B., Das, P.R. and Behera, A.K., "Dynamic Behaviour Analysis of Bowed Rotor by Transfer Matrix Method", Journal of Aeronautical Society of India, Vol.53, No.4, pp.217-225,2001.
- Maharathi, B.B. and Behera, A.K., "Dynamic Analysis of Turbine Rotors by Distributed Elements", Journal of the Institution of Engineers (India), Vol.82, pp.63,68, 2001.
- Maharathi, B.B. and Behera, A.K., "Transfer Matrix Analysis of High Speed Rotors by Distributed Elements", Transactions of Mechanical Engineering, Australia, Vol.ME25, No.l, pp.2l-30, 2001.
- Maharathi, B.B. and Behera, A.K., "Transfer Matrix Method for Dynamic Behaviour of Rotor--Bearing Systems", CSME, Canada (99-CSME-11), June, 2001.
- Maharathi, B.B. and Behera, A.K., "Dynamic Behaviour of Dual Rotor System by Transfer Matrix Method", International Journal of Acoustics and Vibrations (Accepted for publication), May 2002.
- Behera, A.K. and Maharathi, B.B., "Optimization of Bearing Parameters for Minimising Dynamic Response of Rotor-Bearing System", Proceedings of Seventh International Congress on Sound and Vibration, Germany, pp.7 87 -7 94, July 4-7, 2000.
- Maharathi, B.B., "Study on Dynamics of RotorBear- ing Systems and Optimization of Rotor Bearing Parameters for Minimum Rotor Unbalance Response", Ph.D. Dissertation, Sambalpur University, REC, Rourkela.2003.
References
Lund, J.W., "Rotor bearings Dynamic Technology, Part III", Design HandBook for Fluid Film Bearings, Mechanical Technology Inco., AFAPL-TI-65-45, I965.
Lund, J.W. and Orcutt, F.K;, ,'Calculations and Experiments on the Unbalance Response of a Flexible Rotor", Journal of Engineering for Industry, Trans of ASME, Vol.89, pp.785-796, 1967.
Lund, J.W., "Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings,', Journal of Engineering for Industry, Trans. Of ASME. Vol.96, pp.509-517, 191 4.
Lund, J.W., "Modal Response of a Flexible Rotor in Fluid-Film Bearing", Journal of Engineering for Industry, Trans. of ASME, Vol.96, pp.525_533,1974.
Lund, J.W., "A Calculation Method and Data for the Dynamic Coefficients of Oil Lubricated Journal Bearings", The Design Engineer.ing Conference, Chicago,Illinois, USA, pp. l-28, April, 1978.
Someya, T., Journal-Bearing Data Book, Springer- Verlag, Berlin, 1988 7. Prabhu, B.S., "An Experimental Investigation on the Misalignment Effects in Journal Bearings',, Tribology Transactions, Vol.40, No.2, pp.235 _242, 1997 . 8. Maharathi, B.B. and Behera, A.K., ,,Dynamic Behaviour Analysis of Rotor-Bearing Systems by an Improved Transfer Matrix Method", Journal of Aeronautical Society of India, Vol.5l, No.2, pp.72_ 82,1999.
Maharathi, B.B. and Behera, A.K., "parametric Study on Dynamic Behaviour of Rotor-Bearing Systems", Journal of Aeronautical Society of India, Vol.51, No.3, pp. 152-162, t999.
Maharathi, B.B. and Behera, A.K., ,' A Transfer. Matrix Method for Dynamic Behaviour of Rotor-Bearing Systems", Journal of Aeronautical Society of India, Vol.5l, No.4, pp.2l4-224, 1999.
Maharathi, B.B. and Behera, A.K., "Comparative Study ofUnbalance Response and Critical Speeds of Rotor-Bearing Systems". Journal of the Institution of Engineers (India), Vol.80, pp.95- 100, 1999.
Maharathi, B.B. and Behera, A.K., ,,Effect of Disk Flexibility on Rotor Dynamics", Journal of Aeronautical Society of India, Vol.52, No.l, pp.9-18, 2000.
Maharathi, B.B. and Behera, A.K., "Dynamic Behaviour Analysis of Continuous Rotor System", Journal of Structural Engineering (CSIR), India, Vol.28, No.2, pp.S1-88, 2001.
Maharathi, B.B., Das, P.R. and Behera, A.K., "Dynamic Behaviour Analysis of Bowed Rotor by Transfer Matrix Method", Journal of Aeronautical Society of India, Vol.53, No.4, pp.217-225,2001.
Maharathi, B.B. and Behera, A.K., "Dynamic Analysis of Turbine Rotors by Distributed Elements", Journal of the Institution of Engineers (India), Vol.82, pp.63,68, 2001.
Maharathi, B.B. and Behera, A.K., "Transfer Matrix Analysis of High Speed Rotors by Distributed Elements", Transactions of Mechanical Engineering, Australia, Vol.ME25, No.l, pp.2l-30, 2001.
Maharathi, B.B. and Behera, A.K., "Transfer Matrix Method for Dynamic Behaviour of Rotor--Bearing Systems", CSME, Canada (99-CSME-11), June, 2001.
Maharathi, B.B. and Behera, A.K., "Dynamic Behaviour of Dual Rotor System by Transfer Matrix Method", International Journal of Acoustics and Vibrations (Accepted for publication), May 2002.
Behera, A.K. and Maharathi, B.B., "Optimization of Bearing Parameters for Minimising Dynamic Response of Rotor-Bearing System", Proceedings of Seventh International Congress on Sound and Vibration, Germany, pp.7 87 -7 94, July 4-7, 2000.
Maharathi, B.B., "Study on Dynamics of RotorBear- ing Systems and Optimization of Rotor Bearing Parameters for Minimum Rotor Unbalance Response", Ph.D. Dissertation, Sambalpur University, REC, Rourkela.2003.