Air journal bearings are generally employed in the ultra-high-speed machinery and robotics because of their high values of stiffness and damping coefficients. The current work deals with the numerical analysis of misaligned two-lobe air journal bearings. By using the finite element formulation, nonlinear Reynolds equation for compressible air as a lubricant has been solved for computing the characteristics of misaligned air bearing. The coefficients for stiffness and damping of film of air have been computed for misaligned two-lobe air journal bearing. The effect of misalignment on these coefficients has been found significant. Analytically calculated results also show that the misalignment in air bearing significantly drops its air-film thickness. However, the misalignment increases the air bearing stability and critical speed of bearing.

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Influence of Misalignment on the Performance of a Two-Lobe Aerostatic Journal Bearing

  • Chandra B. Khatri,
  • Sumita Chaturvedi,
  • Saurabh K. Yadav,
  • Vivek Kumar

摘要

Air journal bearings are generally employed in the ultra-high-speed machinery and robotics because of their high values of stiffness and damping coefficients. The current work deals with the numerical analysis of misaligned two-lobe air journal bearings. By using the finite element formulation, nonlinear Reynolds equation for compressible air as a lubricant has been solved for computing the characteristics of misaligned air bearing. The coefficients for stiffness and damping of film of air have been computed for misaligned two-lobe air journal bearing. The effect of misalignment on these coefficients has been found significant. Analytically calculated results also show that the misalignment in air bearing significantly drops its air-film thickness. However, the misalignment increases the air bearing stability and critical speed of bearing.