Moment of inertia for concentrated masses

[RRiva]

There are at least two components where the moment of inertia for concentrated masses can be improved.

• blade.structure.elastic_properties.point_mass allows only a list of masses and their span-wise location.
• floating_platform.rigid_bodies.moments_of_inertia allows the mass, Ixx, Iyy, Izz and distance in 3 directions.

I suggest adopting the HAWC2 definition of concentrated_mass for both, which allows:

• Offset distance x-direction [m]
• Offset distance y-direction [m]
• Offset distance z-direction [m]
• Mass [kg]
• Ixx [kg m^2]
• Iyy [kg m^2]
• Izz [kg m^2]
• Ixy [kg m^2] (optional group)
• Ixz [kg m^2] (optional group)
• Iyz [kg m^2] (optional group)

The DYMORE User's Manual is always a good source of inspiration. The MASS_PROPERTY_DEFINITION allows the same parameters as HAWC2, but the "offset distance" is called CENTRE_OF_MASS_LOCATION. Then, it has also an option WITH_RESPECT_TO MASS_CENTRE which we could adopt too.

Best regards,
Riccardo Riva