Measurement and Calculation of the Dynamic Operating Characteristics of the Five Shoe, Tilting Pad Journal Bearing

Brockwell, K.; Kleinbub, D.; Dmochowski, Waldemar

doi:10.1080/10402009008981979

Cited by 43 publications

(25 citation statements)

References 9 publications

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“…Brockwell et al [32] reported additional results for the same rig, bearing and identification method for rotational speeds of 900rpm, 1800rpm, 2700rpm, and 3600rpm. Horizontal stiffness and damping values at 3600rpm were not reported due to a resonance in the test rig frame.…”

Section: Sinusoidal Excitation Without Comprehensivementioning

confidence: 89%

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A Review on Application of Dynamic Parameters of Journal Bearing for Vibration and Condition Monitoring

Babu

Raj²,

Lakshmanan

2015

J. mech.

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The journal bearings are used to support high-speed rotors in turbo machinery which often operate above the rotor first bending critical speed. This bearing provide both lateral support and dynamic coefficients: Stiffness, damping, and mass terms, related to machine vibrations. The various methods of identifying journal bearing dynamic characteristics, from measured data, obtained from different measurement systems, are reviewed. The various approaches to the bearing identification problem are discussed. The various data processing methods in the time and frequency domains are presented. Also, vibration and condition monitoring techniques are presented. In this review, the relative strengths and weaknesses of bearing are presented and developments and trends in improving bearing measurements are documented. Future trends of journal bearing are discussed.

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Section: Sinusoidal Excitation Without Comprehensivementioning

confidence: 89%

“…The rotor was run below the first critical speed and was supported in two cylindrical test bearings. The advantage is that sinusoidal excitation can be applied at any excitation frequency up to the exciter limits, although some experiments have been limited to synchronous excitation [30][31][32][33].…”

Section: Sinusoidal Excitationmentioning

confidence: 99%

A Review on Application of Dynamic Parameters of Journal Bearing for Vibration and Condition Monitoring

Babu

Raj²,

Lakshmanan

2015

J. mech.

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“…Stiffness coefficients had about an order of magnitude less uncertainty than the damping coefficients. The method is applicable to rigs in which steady state sinusoidal loads are used to excite a journal bearing on a rigid rotor (1)-(4), (7), (9)-( l l ) , (17), (18).…”

Section: Experimental Rigmentioning

confidence: 99%

A Hydrodynamic Journal Bearing Test Rig with Dynamic Measurement Capabilities

Flack

Kostrzewsky

Taylor³

1993

Tribology Transactions

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“…Then, the bearing stiffness and damping coefficients are readily estimated by measuring the instantaneous force (magnitude and phase) at the precise instant of time when the displacements (x,y) or velocities (ẋ,ẏ) of the bearing housing are exactly zero. Brockwell, et al (7) use this method for identification of stiffness and damping force coefficients of a five-pad, tilting pad journal bearing with satisfactory results for small orbital motions.…”

Section: Introductionmentioning

confidence: 96%

Identification of Journal Bearing Force Coefficients under High Dynamic Loading Centered Static Operation

Andréas

Santiago

2005

Tribology Transactions

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Lightly damped rotor bearing systems experience large amplitudes of vibration when traversing critical speeds. Bearing linearized force coefficients, strictly valid for minute motions about an equilibrium position, may not be reliable for design or troubleshooting in rotordynamics predictive analyses. Experiments assessing the dynamic forced response of a plain journal bearing undergoing large orbital motions due to singlefrequency excitation forces were conducted in a test rig. The short test bearing of slenderness ratio L/D = 0.25 has a nominal radial clearance of 0.127 mm (5 mils). Tests were conducted at three rotor speeds (900, 1800, and 2700 rpm), three feed pressures (1, 3, and 6 psig), and three excitation frequencies (15, 30, and 45 Hz). Baseline bearing motions due to shaft runout are recorded and subtracted in the parameter identification procedure. The forces exerted on the bearing induce large orbital motions with peak amplitudes exceeding 50% of the nominal bearing clearance. Identified cross-coupled stiffness and direct damping coefficients fall within value bands predicted by the π and 2π models of the fluid film, even for the largest amplitudes of motion. The bearing whirl frequency ratio approaches the typical 50% value at the highest speed tested. Excitation frequency has a marked influence of the test direct dynamic stiffness coefficients with added mass coefficients at least twice as large as predicted values.

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Measurement and Calculation of the Dynamic Operating Characteristics of the Five Shoe, Tilting Pad Journal Bearing

Cited by 43 publications

References 9 publications

A Review on Application of Dynamic Parameters of Journal Bearing for Vibration and Condition Monitoring

A Review on Application of Dynamic Parameters of Journal Bearing for Vibration and Condition Monitoring

A Hydrodynamic Journal Bearing Test Rig with Dynamic Measurement Capabilities

Identification of Journal Bearing Force Coefficients under High Dynamic Loading Centered Static Operation

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