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Rotordynamic Analysis

Torsional, axial and lateral vibrations can each affect the efficiency and reliability of rotating equipment. Torsional vibration is an angular vibration, or twisting, of the shaft. Axial vibration occurs along the axis of rotation, while lateral vibration occurs perpendicular to the axis – side to side or up and down or both.

Bearings Plus can develop rotor models, characterize unbalance and destabilizing forces, and recommend bearing and seal solutions to address high vibration and stability issues. The end result: improved overall performance and service life for the equipment. 

Below are examples of what a typical analytical report may include.


Lateral Rotordynamic Analysis

Sample Lateral Rotordynamic Analysis

  • Undamped critical speed (UCS) analysis
  • Damped critical speed analysis
  • Eigenvalue analysis (critical speeds, mode shapes)
  • Unbalance response analysis
  • API stability analysis (level I and II)
  • Bearing and seal optimization
  • ISFD optimization, if needed
  • Brush seal contact–induced stability and unbalance analysis, if needed


Torsional Rotordynamic Analysis

Sample Torsional Rotordynamic Analysis

  • Torsional natural frequencies
  • Eigenvalue analysis (critical speeds, mode shapes)
  • Damped torque or stress response analysis, if needed
  • Transient analysis for start-up or short circuit analysis for motor or generator trains
  • Transient torsional stress analysis on critical points (e.g., coupling, rotor)


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