Characteristics of a Spherical Seat TPJB With Four Methods of Directed Lubrication: Part 2 — Rotordynamic Performance

Measured and predicted rotordynamic characteristics are presented for a 4-pad, spherical-seat, TPJB with 0.5 pivot offset, 0.6 L/D, 101.6 mm nominal diameter, and 0.3 preload in the load-between-pivots orientation. One bearing is tested four separate times in the following four different lubrication configurations: (1) flooded single-orifice (SO) at the bearing shell, (2) evacuated leading edge groove (LEG), (3) evacuated spray-bar blocker (SBB), and (4) evacuated spray-bar (SB). The same set of pads is used for every test to maintain clearance and preload; each method of lubrication is added as an assembly to the bearing. Test conditions include surface speeds and unit loads up to 85 m/s and 2.9 MPa respectively. Dynamic data includes four sets (one set for each bearing configuration) of direct and cross-coupled rotordynamic coefficients derived from measurements and fit to a frequency independent KCM model. The pivot stiffness (pad and pivot in series) is measured and incorporated into predictions.Copyright © 2015 by ASME

[1]  Rodriguez Colmenares,et al.  Experimental frequency-dependent rotordynamic coefficients for a load-on-pad, high-speed, flexible-pivot tilting-pad bearing , 2004 .

[2]  Luis San Andrés,et al.  The Role of Pivot Stiffness on the Dynamic Force Coefficients of Tilting Pad Journal Bearings , 2013 .

[3]  Dara W. Childs,et al.  Measurements Versus Predictions for the Static and Dynamic Characteristics of a Four-Pad, Rocker-Pivot, Tilting-Pad Journal Bearing , 2013 .

[4]  J. Nicholas.  Tilting Pad Bearing Design. , 1994 .

[5]  J. W. Lund,et al.  ATTENUATION OF BEARING TRANSMITTED NOISE. VOLUME I. SPRING AND DAMPING COEFFICIENTS FOR THE TILTING-PAD JOURNAL BEARING , 1964 .

[6]  Lloyd E. Barrett,et al.  Influence of pad pivot friction on tilting-pad journal bearing measurements-Part II : Dynamic coefficients , 1999 .

[7]  Brian Pettinato,et al.  Test Results of Key and Spherical Pivot Five-Shoe Tilt Pad Journal Bearings—Part I: Performance Measurements , 1999 .

[8]  Dara W. Childs,et al.  Measured Static and Rotordynamic Coefficient Results for a Rocker-Pivot, Tilting-Pad Bearing With 50 and 60% Offsets , 2012 .

[9]  Waldemar Dmochowski.  Dynamic properties of tilting-pad journal bearings : Experimental and theoretical investigation of frequency effects due to pivot flexibility , 2007 .

[10]  Chris David Kulhanek.  Dynamic and Static Characteristics of a Rocker-Pivot, Tilting-Pad Bearing with 50% and 60% Offsets. , 2012 .

[11]  David M. Coghlan,et al.  Characteristics of a Spherical Seat TPJB With Four Methods of Directed Lubrication: Part 1 — Thermal and Static Performance , 2015 .

[12]  Adolfo Delgado,et al.  Identification and Prediction of Force Coefficients in a Five-Pad and Four-Pad Tilting Pad Bearing for Load-on-Pad and Load-Between-Pad Configurations , 2010 .

[13]  Lloyd E. Barrett,et al.  Influence of Pad Pivot Friction on Tilting-Pad Journal Bearing Measurements—Part I: Steady Operating Position© , 1999 .

[14]  John M. Vance,et al.  Machinery Vibration and Rotordynamics , 2010 .

[15]  J. Glienicke,et al.  Paper 13: Experimental Investigation of the Stiffness and Damping Coefficients of Turbine Bearings and Their Application to Instability Prediction: , 1966 .

[16]  Clint Ryan Carter.  Measured and predicted rotordynamic coefficients and static performance of a rocker-pivot, tilt pad bearing in load-on-pad and load-between-pad configurations , 2009 .

[17]  D. Childs,et al.  Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing , 2009 .

[18]  J. C. Nicholas.  Lund’s Tilting Pad Journal Bearing Pad Assembly Method , 2003 .

[19]  Joel Mark Harris,et al.  Static characteristics and rotordynamic coefficients of a four-pad tilting-pad journal bearing with ball-in-socket pivots in load-between-pad configuration , 2009 .

[20]  Waldemar Dmochowski,et al.  Effect of Oil Evacuation on the Static and Dynamic Properties of Tilting Pad Journal Bearings , 2006 .