Horizontal Wind Model

Transform horizontal wind into body-axes coordinates

  • Library:
  • Aerospace Blockset / Environment / Wind

  • Horizontal Wind Model block

Description

The Horizontal Wind Model block computes the wind velocity in body-axes coordinates.

The wind is specified by wind speed and wind direction in Earth axes. The speed and direction can be constant or variable over time. The direction of the wind is in degrees clockwise from the direction of the Earth x-axis (north). The wind direction is defined as the direction from which the wind is coming. Using the direction cosine matrix (DCM), the wind velocities are transformed into body-axes coordinates.

Ports

Input

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Direction cosine matrix, specified as a 3-by-3 matrix, to transform the wind velocities into body-axes coordinates.

Data Types: double

Wind speed, specified as a 1-by-3 vector, in selected units.

Dependencies

To enable this parameter, set Wind speed source to External.

Data Types: double

Wind direction, specified as a scalar, in degrees. The direction of the wind is in degrees clockwise from the direction of the Earth x-axis (north). The wind direction is defined as the direction from which the wind is coming.

Dependencies

To enable this parameter, set Wind direction source to External.

Data Types: double

Output

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Wind velocity, returned as a 3-by-3 matrix, in body-axes, in selected units.

Data Types: double

Parameters

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Input and output units, specified as:

Units

Wind Speed

Wind Velocity

Metric (MKS)

Meters per second

Meters per second

English (Velocity in ft/s)

Feet per second

Feet per second

English (Velocity in kts)

Knots

Knots

Programmatic Use

Block Parameter: units
Type: character vector
Values: 'Metric (MKS)' | 'English (Velocity in kts)' | 'English (Velocity in ft/s)'
Default: 'Metric (MKS)'

Wind speed source, specified as:

External

Variable wind speed input to block

Internal

Constant wind speed specified in mask

Dependencies

  • Setting this parameter to Internal enables Wind speed at altitude.

  • Setting this parameter to External enables the Vwind input port.

Programmatic Use

Block Parameter: Vw_source
Type: character vector
Values: 'Internal' | 'External'
Default: 'Internal'

Constant wind speed, specified as a double scalar, in specified units.

Dependencies

To enable this parameter, set Wind speed source to Internal.

Programmatic Use

Block Parameter: Vwind
Type: character vector
Values: scalar
Default: '15'

Wind direction source, specified as:

External

Variable wind direction input to block

Internal

Constant wind direction specified in mask

Dependencies

  • Setting this parameter to Internal enables Wind direction at altitude (degrees clockwise from north).

  • Setting this parameter to External enables the θwind input port.

Programmatic Use

Block Parameter: W_source
Type: character vector
Values: 'Internal' | 'External'
Default: 'Internal'

Constant wind direction, specified as a scalar, in degrees clockwise from the direction of the Earth x-axis (north). The wind direction is the direction from which the wind is coming.

Dependencies

To enable this parameter, set Wind direction source to Internal.

Programmatic Use

Block Parameter: Wdeg
Type: character vector
Values: scalar
Default: '0'

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Introduced before R2006a