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How do I consider propeller damping in torsional vibration calculations?

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Torsional vibration analysis

Propeller damping plays an important role in torsional vibration analysis.

In the Nauticus Torsional Vibration tool, five different methods of damping calculation are available:

  • Archer approach: Consider the propeller damping as a consequence of the propeller’s torque characteristics. Derive the damping coefficient from the propeller law. Suitable for both fixed pitch propeller and controllable pitch propeller.
  • Frahm approach: Similar to Archer approach but using Frahm number.
  • Schwaneke approach: Use Schwaneke empirical formula to calculate the propeller damping. It is dependent on the propeller geometry.
  • Dynamic magnifier approach: Use the dynamic magnifier/dynamic magnifier percent to simulate the propeller damping. It is often used for MAN propellers.
  • Variable approach: The dynamic magnifier percentage changes as function of propeller rotational speed.
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