Stability of a rigid rotor in turbulent hybrid porous journal bearings

Stability characteristics of hybrid porous journal bearings with a turbulent fluid film have been investigated theoretically following Constantinescu's turbulent lubrication theory. The stability curves have been drawn for different Re, eccentricity ratios, slenderness ratios and bearing speed parameters. In the absence of any experimental data, laminar flow results obtained by this analysis have been compared and found to be in excellent agreement with the previous results. It is observed that turbulence deteriorates the stability of the rotor and for better performance the value of the bearing feeding parameter, β, should be kept small.

[1]  R. Holmes.  The role of oil-film bearings in promoting shaft instability and the remedial effect of damping , 1980 .

[2]  M. T. Pascal,et al.  Stability and Unbalance Response of Large Turbine Bearings , 1982 .

[3]  W. A. Crosby,et al.  The stability of a rigid rotor in ruptured finite journal bearings , 1982 .

[4]  R. Leonard,et al.  Dynamic force coefficients and the mechanism of instability in hydrostatic journal bearings , 1973 .

[6]  Hiromu Hashimoto,et al.  An Influence of Inertia Forces on Stability of Turbulent Journal Bearings , 1982 .

[7]  A. K. Chattopadhyay,et al.  Stability of a Rigid Rotor in Finite Externally Pressurized Oil Journal Bearings With Slip , 1987 .

[8]  M. K. Ghosh,et al.  Rotordynamic coefficients of multirecess hybrid journal bearings part I , 1989 .

[9]  G. Capone,et al.  Dynamic characteristics and stability of a journal bearing in a non-laminar lubrication regime , 1987 .

[10]  C. H. T. Pan,et al.  Comparison Between Theories and Experiments for the Threshold of Instability of Rigid Rotor in Self-Acting, Plain-Cylindrical Journal Bearings , 1964 .

[11]  S. Heller.  Static and Dynamic Performance of Externally Pressurized Fluid Film Journal Bearings in the Turbulent Regime , 1974 .

[12]  B. Sternlicht,et al.  ON THE STABILITY OF ROTORS IN CYLINDRICAL JOURNAL BEARINGS , 1962 .

[13]  P. R. Trumpler,et al.  Stability of the High-Speed Journal Bearing Under Steady Load: 1—The Incompressible Film , 1962 .

[15]  J. F. Booker,et al.  Turborotor Instability: Effect of Initial Transients on Plane Motion , 1969 .

[16]  D. V. Singh,et al.  Stability and Relative Stability of Porous Journal Bearing System With Axes Skewed , 1974 .