Comment on Tower Loads

Wind & Water Computer-Aided Engineering Software Tools
1

Hello!

I am currently working on my bachelor thesis and I have stumbled upon an interesting problem where it is required to simulate and draw the loads on the tower of a 3-blade 1.5 MW turbine while considering two cases and to compare between them.
The 1st case is considering the tower as a rigid body i.e. neglecting its elasticity.
The 2nd case is considering the tower as a normal elastic body.
this curve is an example of my output.

I would like to know why the amplitude of the shear force was lower in the case of a rigid tower and its frequency is larger as well.

Kind regards.
new.jpg

2

Dear Hisham,

I’m not aware of your simulation set up, but presumably the natural frequency of the elastic tower is being excited by the wind-induced loads. The dominant frequency of the elastic tower is likely the first bending mode of the tower and the higher frequencies of the rigid tower are likely the wind-induced loads.

Best regards,