Hello,
Is “YawBrMxp” transferred to the tower and thus cause tower side-side oscillations?
My understanding is that only friction torque that resists shaft rotation will be transferred to the tower. Please clarify. Thanks.
Regards,
Kumara
Hello,
Is “YawBrMxp” transferred to the tower and thus cause tower side-side oscillations?
My understanding is that only friction torque that resists shaft rotation will be transferred to the tower. Please clarify. Thanks.
Regards,
Kumara
Dear @KumaraRaja.Eedara,
Yes, ElastoDyn output YawBrMxp represents the side-to-side bending moment transferred to the tower. The dominant component of YawBrMxp is the generator torque in most cases, but gearbox friction and side-to-side forces from the rotor also contribute.
Best regards,
Dear @Jason.Jonkman
Thanks for your response. Could you please confirm the below. In the shaft tilt = 0 case, the contribution of the rotor side-to-side forces to the “YawBrMxp” is because of the moment arm “Twr2Shft” (the distance between the ‘main shaft’ and ‘yaw bearing location’ along tower axis). Right?
Regards,
Kumara
Dear @KumaraRaja.Eedara,
That would be true if the applied side-to-side force was centered along the shaft axis. But such a force need not be centered along the shaft, e.g., in the presence of wind shear.
Best regards,