Although use of some of the detailed modelling features like multi-part blade and dynamic stall are important in time domain simulations, it is often a reasonable simplification to remove them in the linearization calculation. They typically do not significantly affect the tuning in the frequency range of the controller. Including these features significantly increases the number of modes and therefore states in the state space model. This can lead to issues in the linearization post processing and can make linear design in SISO tools more difficult.
The user can often get sufficiently accurate results with a simpler linear model by:
(1) Simplifying the blade to a single part blade. To simplify, click 'delete selected blade parts' in Flexibility Modeller screen - Bladed will reassign stations automatically. The 'axial loads only' Blade geometric stiffness model is recommended for single part blades. Enough blade modes should be used to capture the blade 1st torsional mode.
(2) Disabling dynamic stall. This significantly reduces the number of states and in most cases does not influence the dynamics relevant to the controller.
To disable dyanmic stall, go to "Specify" -> "Aerodynamic control".
