Main shaft
Geometry
Scaling scheme
Scheme for scaling of this part only.
Options:
Parent (default):
The scale factor is set equal to the scale factor for the parent part.
Override:
A scaling factor (set by you) for this part only (i.e. the scaling factor set for the parent part is overridden).
Scaling factor
The geometry of this part will be scaled by this factor.
- Default value: 1
- Unit: —
- Range: 0.001 — 1000
Length
The length of the main shaft (distance along the shaft from the end to the hub center).
- Default value: 10
- Unit: $\text{m}$
- Range: 0.001 — 100
Hori. distance to hub
The horizontal distance from the tower top (i.e. yaw axis) to the hub (i.e. the front of the main shaft).
- Default value: 5
- Unit: $\text{m}$
- Range: 0 — 100
Vert. distance to hub
The vertical distance from the tower top (i.e. yaw axis) to the hub (i.e. the front of the main shaft).
- Default value: 2.4
- Unit: $\text{m}$
- Range: 0 — 100
Maximum element length
The maximum length a generated frame element of the main shaft can have, i.e. the elements will have this length or shorter.
- Default value: 2
- Unit: $\text{m}$
- Range: 0.01 — 100
Cross section
Shaft radius
Outer radius of the main shaft.
- Default value: 0.8
- Unit: $\text{m}$
- Range: 0.005 — 10
Wall thickness
The thickness of the shaft walls.
- Default value: 0.028
- Unit: $\text{m}$
- Range: 0.001 — 1
Shaft material
The name of material to use for the cross section.- Default value: SteelMassless
- Unit: —
Advanced
Front bearing position
The relative position of the front bearing along the main shaft, given as a fraction of the main shaft length. That is, a value of 0 means at the hub center, while a value of 0.9 means 10% from the aft of the main shaft.
- Default value: 0.1912
- Unit: —
- Range: 0 — 0.9
Aft bearing position
The relative position of the aft bearing along the main shaft, given as a fraction of the main shaft length. That is, a value of 0.1 means a tenth from the hub center, while a value of 1 means at the aft of the main shaft.
The aft position must be at least 0.1 greater than the front position. If it is not then it will be auto-adjusted.
- Default value: 0.8
- Unit: —
- Range: 0.1 — 1
Bearings locked
If enabled, the two bearings will be locked; i.e. the shaft will be rigidly connected to the nacelle. The shaft will not be able to rotate. In an eigenvalue analysis, this option will always be enabled.
If the bearings are locked then the initial RPM (rotational velocity) of the rotor and generato will be set to 0 by changing Analysis parameters-> Initial conditions-> RPM to 0 rpm, and RPM, TSR, or Tip speed to Specify RPM, and disabling both parameters.
- Default value: False
- Unit: —