Proven low-cost gas bearing technologies are sought to enable more compact rotating machinery products with extended maintenance intervals. The paper presents an analysis for predicting the static and dynamic forced performance characteristics of metal mesh foil bearings (MMFBs) which comprise a top foil supported on a layer of metal mesh of a certain compactness. The analysis couples a finite element model of the top foil and underspring support with the gas film Reynolds equation. A comparison of the predictions against laboratory measurements with two bearings aims to validate the analysis. The predicted drag friction factor in one bearing (L = D = 28.00 mm) during full film operation is just f ∼ 0.03 at ∼50,000 rpm, in good agreement with measurements at increasing applied loads. The predictions further elucidate the effect of the applied load and rotor speed on the bearing minimum film thickness, journal eccentricity, and attitude angle. For a second bearing (L = 38.0 mm, D = 36.5 mm), predicted bearing force coefficients show magnitudes comparable with the measurements, with less than a 20% difference, in the 250–350 Hz excitation frequency range. While the predicted direct stiffness coefficients are rather constant, the experimental force coefficients increase with frequency (maximum 400 Hz), due mainly to the increasing amplitudes of dynamic force applied to excite the bearing with a set amplitude of motion. The analysis underpredicts the direct damping coefficients at high frequencies (>300 Hz). The cross-coupled stiffness and damping coefficients are typically lower (<40%) than the direct ones. The bearings operated stably at all speeds without any subsynchronous whirl. The reasonable agreement of the predictions with the available test data promote the better design and further development of MMFB supported rotating machinery.
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December 2013
Research-Article
Performance Characteristics of Metal Mesh Foil Bearings: Predictions Versus Measurements
Luis San Andrés,
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Texas A&M University,
e-mail: LSanAndres@tamu.edu
Fellow ASME
Mechanical Engineering Department
,Texas A&M University,
College Station, TX 77843
e-mail: LSanAndres@tamu.edu
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Thomas Abraham Chirathadam
Thomas Abraham Chirathadam
1
Research Engineer
Southwest Research Institute,
e-mail: Thomas.Chirathadam@swri.org
Mechanical Engineering Division
,Southwest Research Institute,
San Antonio, TX 78228
e-mail: Thomas.Chirathadam@swri.org
1Work conducted as a Graduate Research Assistant at Texas A&M University.
Search for other works by this author on:
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Texas A&M University,
e-mail: LSanAndres@tamu.edu
Fellow ASME
Mechanical Engineering Department
,Texas A&M University,
College Station, TX 77843
e-mail: LSanAndres@tamu.edu
Thomas Abraham Chirathadam
Research Engineer
Southwest Research Institute,
e-mail: Thomas.Chirathadam@swri.org
Mechanical Engineering Division
,Southwest Research Institute,
San Antonio, TX 78228
e-mail: Thomas.Chirathadam@swri.org
1Work conducted as a Graduate Research Assistant at Texas A&M University.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 24, 2013; final manuscript received July 28, 2013; published online September 20, 2013. Editor: David Wisler.
J. Eng. Gas Turbines Power. Dec 2013, 135(12): 122503 (8 pages)
Published Online: September 20, 2013
Article history
Received:
June 24, 2013
Revision Received:
July 28, 2013
Citation
San Andrés, L., and Abraham Chirathadam, T. (September 20, 2013). "Performance Characteristics of Metal Mesh Foil Bearings: Predictions Versus Measurements." ASME. J. Eng. Gas Turbines Power. December 2013; 135(12): 122503. https://doi.org/10.1115/1.4025146
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