How to apply icedyn to floating turbines in FAST

Wind & Water Computer-Aided Engineering Software Tools
6

Dear @Yinghan.Liu,

Just a few comments:

  • The drivetrain in ElastoDyn is modeled with rigid-body rotation and a torsional spring, expressed for the low-speed shaft. This doesn’t mean that all torsional flexibility has to be within the low-speed shaft (torsional flexibility of the shaft could come from a combination of the low-speed shaft, high-speed shaft, and gearbox), just that the model and parameters must be specified relative to the low-speed shaft.
  • The virtual strain gauge on the low-speed shaft is assumed to be located on the generator-side of the spring, with the hub/rotor on the other side of the spring.
  • The high-speed shaft speed is modeled simply by multiplying the low-speed shaft speed (on the generator-side of the spring) by the gearbox ratio (GBRatio).
  • Thus, LSSGagVxa = GBRatio * HSShftV and LSSGagVxa differs from RotSpeed by the small contribution from the rotation of the spring.
  • The following forum topic is likely of interest to you: Resistant moment of the rotor and of the electric generator.

Best regards,