Stability analysis of a disk-spindle system supported by coupled journal and thrust bearings considering five degrees of freedom

This paper investigates the stability of a disk-spindle system supported by coupled journal and thrust bearings considering the five degrees of freedom of a rotor-bearing system. The Reynolds equations and their perturbed equations of the coupled bearings were solved by FEM to calculate the stiffness and damping coefficients. The critical mass of the rotor-bearing system was determined by solving the linear equations of motion. As a result, the tilting motion was a major design consideration to determine the stability of the rotor-bearing system. Additionally, the stability without the tilting motion was overestimated, as compared to that with the tilting motion.

[1]  Sanghoon Lee,et al.  Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive , 2006 .

[2]  B. C. Majumdar,et al.  Effect of Fluid Inertia on Stability of Oil Journal Bearings , 2000 .

[3]  Gunhee Jang,et al.  Determination of the Dynamic Coefficients of the Coupled Journal and Thrust Bearings by the Perturbation Method , 2006 .

[4]  B. C. Majumdar,et al.  Stability of journal bearing systems using non-Newtonian lubricants: a non-linear transient analysis , 1999 .

[5]  N. S. Rao,et al.  Stability Analysis of Flexibly Supported Rough Submerged Oil Journal Bearings , 1997 .

[6]  C. A. Papadopoulos,et al.  Identification of clearances and stability analysis for a rotor-journal bearing system , 2008 .

[7]  Kyosuke Ono,et al.  Stability analysis of a disk-spindle supported by a plain journal bearing and pivot bearing , 2005 .

[8]  Yoon Chul Rhim,et al.  A Study of the Oil-Lubricated Herringbone-Grooved Journal Bearing—Part 1: Numerical Analysis , 1996 .

[9]  Sanghoon Lee,et al.  Dynamic Coefficients of the Coupled Journal and Thrust Bearings Considering Five Degrees of Freedom for a General Rotor-Bearing System , 2007 .

[10]  Gunhee Jang,et al.  Determination of the dynamic coefficients of the coupled journal and thrust bearings by the perturbation method , 2006 .

[11]  G. Jang,et al.  Stability Analysis of a Hydrodynamic Journal Bearing With Rotating Herringbone Grooves , 2003 .

[12]  Yeon-Pun Chang,et al.  Influence of restrictor on stability of the rigid rotor–hybrid bearing system , 2006 .

[13]  Raghuvir B Pai,et al.  Stability of submerged oil journal bearings under dynamic load , 1991 .