Blade Tip and Tower Top Mass Property

Hello everyone,
I want to get a information about tip and tower top mass. What is criteria to select and assign these values.
Thank you for your consideration.

Kaan Ciloglu
Aerospace Engineer

Dear Kaan,

Are you referring to the use of BModes or something else? Please clarify.

Best regards,

Depar Jason,
I meant BModes input parameters that I mentioned

Best Regards

Dear Kaan,

Normally there is no lumped mass at the blade tip, so, the blade-tip mass, center of mass, and inertias can normally be set to zero in BModes. However, the tower-top mass, center of mass, and inertias normally have a strong impact on the tower mode shapes, so, normally these values should be set appropriately when deriving tower mode shapes from BModes.

If that doesn’t answer your question; please clarify.

Best regards,

Dear Jason
Thank you so much for your clarification. So what is the criteria assign the tower-top mass (Does it means nacelle mass?)

Best regards
Kaan Ciloglu

Dear Kaan,

When deriving tower mode shapes from BModes, you should set the appropriate tower-top mass and inertia in BModes. By “tower-top”, I mean the rotor, drivetrain, and nacelle treated as a single rigid body.

Best regards,

Dear Jason
Thank you so much for your interest.

Kind regards
Kaan Ciloglu