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Technical Brief

Dynamic response of unbalanced rigid rotor bearing system with non-linear hydrodynamic force

[+] Author and Article Information
Chandan Kumar

Ph.D. Scholar, Department of Mechanical Engineering, Indian Institute of Technology, Patna, India 801103
chandan.pme14@iitp.ac.in

Somnath Sarangi

Associate Professor, Department of Mechanical Engineering, Indian Institute of Technology, Patna, India 801103
somsara@iitp.ac.in

1Corresponding author.

ASME doi:10.1115/1.4037995 History: Received July 04, 2017; Revised September 20, 2017

Abstract

Planar dynamics of a rotor supported by long hydrodynamic journal bearing is investigated theoretically. An analytical model of the long journal bearing system is numerically integrated for analysis of fixed point and periodic oscillations. The nonlinearities in the system arise due to a nonlinear fluid film force acting on the journal. The influences of three dimensionless parameters viz. bearing parameter, unbalance, and rotor speed on the dynamic behavior of the rotor bearing system is studied and compared with the short journal bearing. For the same bearing parameter, short bearing has large operating speed compared to a long bearing. Results are presented in the form of a bifurcation diagram and Poincare┬┤ map of the oscillations based on numerical computation. The considered unbalanced system shows periodic, multiperiodic and quasi-periodic motion in different speed range. Jumping phenomenon is also observed for a high value of bearing parameter with unbalance.

Copyright (c) 2017 by ASME
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