Bearing Calculation and Analysis Capabilities – AxSTREAM®

Introduction

Rotor dynamics analysis would neither be complete nor reliable without accurate modeling of bearings. The AxSTREAM® Bearing module uses a finite difference method that allows calculating mechanical (including direct and cross-coupled stiffness and damping coefficients) and hydrodynamic (maximum fluid pressure, minimum film thickness, etc.) characteristics of the following:

  • Rolling elements bearing – Deep groove, self-aligning, spherical roller, straight roller, tapered roller, and so on
  • Bump gas bearing
  • Cylindrical journal (hydrodynamic) bearing
  • Fixed and tilting pad journal bearing
  • Fixed and tilting pad thrust bearings

Bearing-AxSTREAM

The embedded library of fluids allows users to use new or existing incompressible and compressible fluids throughout different projects.

Analysis & Post-Processing

Several analyses can be performed in this module:

  • Steady state – Considers bearing state under loading in order to determine pressure distribution, bearing clearance, eccentricity, stiffness and damping.
    Bearing-analysis
  • Stability – Considers the bearing behavior during its transient operation and allows drawing conclusions on the stability of instability of the design for the studied rotation speed.
    Bearing-post
  • Map analysis – Performs several inverse analyses in order to calculate the evolution of the mechanical characteristics for a given series of rotation speeds.
    Bearing-post-processing

These properties can then be exported to a printer-friendly report or the AxSTREAM® RotorDynamics software in order to automatically use the appropriate values during rotor dynamics analyses.

Additionally, pockets, misalignments, etc. can be considered for the different calculations.

Bearing-analysis-post-processing

Moreover, the lubricant flow rate is calculated along with the heat balance and temperature distributions.