Torsional Analysis

Torsional Vibration Analysis

Train torsional analysis has been carried out in order to ensure the mechanical reliability in rotating machinery. The analysis results provided by INERTANCE can be used to determine the location which has the torsional vibration by resonance relative to potential excitation. These study include the steady state forced response, campbell diagram, mode shape analysis.

INERTANCE has a capability to perform below kinds of rotor dynamics analysis.

  • Undamped torsional anlaysis
  • Damped torsional analysis
  • Steady state forced (Torque) response analysis
  • Stress analysis
  • Mode shape
  • Train torsional vibration analysis
  • Transient analysis
  • S-N curve analysis
  • Modified goodman diagram analysis
  • As per API 610, 617, 618, 684, etc (Any other API standard)
  • Source identification of torsional vibration
  • Torsional displacement, velocity, torque response
  • Campbell diagram

In case of any potential risks occurs, for example critical speeds are interfered within operating range, the stress analysis has to be performed to prevent the torsional fatigue failure. INERTANCE can provide various kinds of rotor dynamics analysis as requested in API standards.

Here, INERTANCE can show the various kinds of Torsional Vibration analysis as follows;

Torsional Analysis, Mode shape for Centrifugal Compressor
Torsional Analysis, Mode shape for Centrifugal Compressor


Undamped Torsional Analysis, Campbell diagram

Train rotor assembly including driver is modeled for undamped torsional natural frequency analysis, which predicts if critical speeds are interfered with operating region against various excitation sources.

Campbell Diagram Analysis for Torsional Vibration
Campbell Diagram Analysis for Torsional Vibration


Forced Response Analysis (Torque Response)

Torsional excitation sources have to be considered to perform the steady state torque response analysis. The magnitude of torque & torsional displacement is checked for reliability of each component such as coupling, etc.

Steady State Forced Response Analysis
Steady State Forced Response Analysis


Torsional Stress Analysis

If the undamped torsional analysis has a result of interference between excitation sources and natural frequency under operating region, the torsional stress analysis has to be carried out. INERTANCE provides the stress analysis such as Stress-life method, Strain-life method, Goodman diagram method, etc.

Torsional Stress Analysis
Torsional Stress Analysis

INERTANCE has a capability regarding noise and vibration engineering, and our experts are familiar with assessment of Torsional Vibration Analysis. For further information, contact us at (

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