Blade and rotor mass in moment and loads calculations

Wind & Water Computer-Aided Engineering Software Tools
1

Hi,

I am trying to find moments on the shaft that I expect the bearing will experience. a diagram below for reference:

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I was planning on using the forces RtFldFyh and RtFldFzh to find these loads. Upon review I was looking into the effect of blade and hub mass on the force calculations. I had adjusted the AdjBlMs between 2 and 3.5 for a simple comparison.

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I have two questions on how these loads are calculated:

  • From what I understand LSSTip and other shaft tip moments are calculated from forces at blade root, and hub radius as the moment arm, does this mean the forces does not include the weight of blades?
  • similarly for RtFldFxh, is the weight of hub and blade not being considered in the rotor total force?

Thank you.

Best regards,

2

Dear @Ariff.Alzakri,

The load outputs from AeroDyn (RtFldFxh, etc.) are pure aerodynamic applied loads. While these loads are impacted by structural motion (as part of the aero-elastic solution), the loads themselves don’t include structural terms such as weight and inertia.

The load outputs from ElastoDyn (LSSTipMys, etc.) are reaction loads within the member; that is, they are the total load transmitted through the member at the output location, including applied loads (aerodynamic, hydrodynamic), and structural terms (weight/inertia). You can output the reaction loads at the main bearing by locating the shaft gage at the main bearing via ElastoDyn input ShftGagL and then requesting outputs at the gage location (LSSGagMys, etc.).

Best regards,