Hawc2 to Ashes
This document provides a table giving the equivalent between the
Blade structure file
in Ashes and Hawc2.
| Ashes | Hawc2 equivalence | Comment |
| BladeFraction | r/blade_length | Ashes gives the data normalised against the blade length whereas Hawc2 gives absolute data |
| StrctTwist | pitch | |
| BMassDen | m | see note below |
| FlpStff | I_y * E | Hawc2 gives aera moments of inertia I_x and I_y and Elastic modulus E |
| EdgStff | I_x * E | |
| GJstff | G * K | Hawc2 gives the torsional stiffness constant K and the shear modulus of elasticity G |
| EA | E * A | Hawc2 gives the Elastic modulus E and the cross sectional area A |
| FlpIner | m * ri_x^2 | Hawc2 gives the radius of gyration ri_x |
| EdgIner | m * ri_y^2 |
|
| ElasticCenterOffsetX | x_e | Ashes and Hawc2 use the same definition and reference point |
| ElasticCenterOffsetY | y_e | |
| MassCenterOffsetX | x_cg | |
| MassCenterOffsetY | y_cg | |
| ShearCenterOffsetX | x_sh | |
| ShearCenterOffsetY | y_sh | |
| GShearAreaFlapwise | G * A * k_x | Hawc2 gives a shear correction factor k_x |
| GShearAreaEdgewise | G * A * k_y |
Note on the mass:
to get the correct mass of the blades in Ashes, given that Hawc2 provides the mass at the center of an element, the average of the masses at the two nodes defined in the Hawc2 file should be taken. This was done for the
IEA 15-MW
blade, because it has relatively few structural elements, and not doing so resulted in a blade mass 12% larger than the specification document.