Is it possible to simulate in Bladed without the RNA e.g. for modelling of a tower and support structure during installation?
Simulation without RNA can be useful to e.g. compare tower frequencies to other software, without the influence of the RNA.
There is not an explicit option in Bladed to ignore the rotor-nacelle assembley, however this can be achieved with the following steps. The basic idea is to make all RNA components rigid and (almost) massless, and to remove any aerodynamic loads on the RNA components.
Simulation type
Choose a "Parked" simulation type, or a Campbell diagram in "parked" configuration
Blade screen
Delete outer blade stations so that there are only 3 stations (the minimum allowed).
On the "mass and stiffness" tab, set the blade mass and inertia to a small value, e.g. 0.01.
Delete any point masses on the blade.
Nacelle screen
Set the nacelle drag coefficient to zero, and mass and inertia properties as shown below.
Rotor: Hub screen
For a geared turbine: set the properties shown in red below.
For direct drive turbine: set the properties shown in red and green below.
Rotor screen
Set the overhang to 0.01m.
Imbalances
Set the rotor imbalance mass to zero.
Yaw screen
Set the yaw type to "None"
Power train screen
Set generator inertia to 0.01 and disable all power train flexibility options.
Brake screen
Define a brake with a high torque value (e.g. 1e10)
Flexibility modeller screen
Disable the blade flexibility
Aerodynamics screen
Disable the dynamic wake and dynamic stall models
