Drive Train Mounting Flexibility

If desired, hinge flexibility may be specified in the gearbox mounting and/or between the pallet or bedplate and the tower top/yaw bearing. This option is only allowed if the dynamic drive train model is specified without the gearbox DLL facility. It adds an additional rotational degree of freedom for each selected flexibility. If the external DLL facility is used it can include its own flexible mountings. The different mounting flexibility options will introduce hinge components in the turbine multibody model.

Select the Power Train > Mounting tab to view and edit the drive train mounting options.

Specify the following parameters:

• The torsional stiffness of the mounting (the axis of rotation is assumed to coincide with the rotor shaft).
• The damping of the mounting.
• In the case of a flexible gearbox mounting, the moment of inertia of the gearbox casing.

Flexible mountings introduce a high frequency mode which is liable to result in much slower simulations. If the mountings are relatively stiff, for example if they are intended for noise isolation, then they will not influence loads significantly and are best omitted. If they are intended to modify the rotational dynamics, then they can be approximated by a corresponding reduction in shaft stiffness. This will have little effect on rotor and tower loads, but simulations will run faster.

Last updated 28-08-2024