Wind Shear Model
A wind shear model.
Description
The Wind Shear Model block implements the wind shear model in a coupled coordinate system according to [1].
The shear value in the normal coordinate system is defined as the averaged profile of wind characteristics at the height of over the measured wind velocity at a height of 20 feet ( 6 m). It is described by the formula:
where - is a constant characterising the flight stage according to [1]:
-
For flight stages of category C: take-off, approach and landing - . .
-
For other phases - . .
The height of should lie between 3 feet and 1000 feet.
The average wind speed in the linked coordinate system is obtained by multiplying the corresponding transformation matrix by the average speed in the normal coordinate system.
The Wind Shear Model block works in SI units.
Ports
Input
h (m) - height
scalar
The height at which wind shear is determined. Measured in units of length.
Data types: Float64.
DCM - conversion matrix
`3 by 3 matrix
The matrix of directional cosines for transforming the component vectors of the normal coordinate system into a connected one.
Data types: Float64.
Parameters
Flight phase - flight phase
Category C - Terminal Flight Phase (by default) | Other
Flight phase according to [1].
Wind speed at 6 m altitude - wind speed at 6 metres altitude
15.0 (by default) | scalar
Measured wind speed at 6 metres (≈ 20 feet) above the ground, m/s.
Wind direction at 6 m altitude (degrees clockwise from north) - wind direction at 6 metres altitude
0.0 (by default) | scalar.
Wind direction at a height of 6 metres (≈ 20 feet) from the ground, degrees. The direction is counted clockwise from the direction of the axis of the of the normal coordinate system. Wind direction is the direction from which the wind blows.