Forum
Important Notice for New User Registrations
To combat an increasing number of spam and bot registrations, we now manually approve all new user registrations. While this may cause a delay until your account is approved, this step is essential to ensure the quality and security of this forum.
To help us verify your registration as legitimate, please use a clear name as user name or an official email address (such as a work, university, or similar address). If you’re concerned that we may not recognize your registration as non-spam, feel free to email us at with a request to approve your username.
Loads at the tower bottom
Hello,
I want to extract the forces and moments at the tower bottom of a floating off-shore turbine. From the names of two structural time graph output variables, it seems that this can be obtained from, for example, “Z_l For. TWR Bot. Constr. [N]” or “Z_l For. TWR pos 0.000 [N]”, so I am wondering what are the differences between this two outputs? And do they include the gravitational force due to the weight of the entire structure?
Thanks.
Best regards,
João Muralha
Hi João,
the two sensors that you mention will output the same data. The first sensor (TWR Bot. Constr.) is a default senseor that is automatically included in the simulation. The second sensor (TWR pos 0.000) is a user defined sensor at the same location. Both sensors include the gravitational force acting on all components of the turbine above the tower bottom.
BR,
David
Hello David,
I get different forces values for the “Z_l For. TWR Bot. Constr. [N]” or “Z_l For. TWR pos 0.000 [N]” as can be seen in the attached image.
Thanks,
João Muralha
Uploaded files:
- You need to login to have access to uploads.
Hi João,
it could be that there are point masses attached to the tower bottom node, in which case this mass would not appear in the “POS 0.0000” variable.
I would check the mass/inertia overview in the turbine definition module and the substructure file.
BR,
David
