Aerodynamic Forces and Moments
Calculation of aerodynamic forces and moment.
blockType: SubSystem
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Path in the library: |
Description
Block Aerodynamic Forces and Moments calculates the components of the aerodynamic force and the aerodynamic moment relative to the center of gravity of the aircraft in the associated coordinate system using the following formulas.
Components of the aerodynamic force:
where
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— coefficient of longitudinal force;
-
— the coefficient of normal force;
-
— coefficient of lateral force;
-
— high-speed pressure;
-
— a characteristic square.
Components of the aerodynamic moment:
where
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— roll moment coefficient;
-
— coefficient of yaw moment;
-
— the coefficient of pitch moment;
-
— the characteristic linear size of the aircraft;
-
— the average aerodynamic chord of the wing;
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, , — coordinates of the center of gravity;
-
, , — coordinates of the pressure center.
Ports
Input
#
Coefbody
—
aerodynamic coefficients
`vector 6 to 1
Details
Coefficients of aerodynamic force and moment components along the axes in a coupled coordinate system, given as a vector. Elements of the vector:
-
- longitudinal force coefficient.
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- normal force coefficient.
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- transverse force coefficient.
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- roll moment coefficient.
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- yaw moment coefficient.
-
- pitching moment coefficient.
| Data types |
|
| Complex numbers support |
No |
#
qbar
—
velocity heads
`vector 3 to 1
Details
Velocity heads calculated from the components of aircraft velocity along the axes of a coupled coordinate system, given as a vector.
| Data types |
|
| Complex numbers support |
No |
#
CG
—
centre of gravity coordinates
`vector 3 to 1
Details
The coordinates of the centre of gravity of an aircraft. Measured in units of length, given as a vector.
| Data types |
|
| Complex numbers support |
No |
#
CP
—
centre of pressure coordinates
`vector 3 to 1
Details
The coordinates of the centre of pressure of an aircraft, given as a vector. Measured in units of length.
| Data types |
|
| Complex numbers support |
No |
Output
#
Fbody
—
aerodynamic forces
`vector 3 to 1
Details
The components of the aerodynamic force relative to the centre of mass of an aircraft in a coupled coordinate system, given as a vector. Elements of the vector:
-
- longitudinal force.
-
- normal force.
-
- transverse force.
Measured in units of force.
| Data types |
|
| Complex numbers support |
No |
#
Mbody
—
aerodynamic moments
`vector 3 to 1
Details
The components of the aerodynamic moment relative to the centre of mass of an aircraft in a coupled coordinate system, given as a vector. Elements of the vector:
-
- roll moment.
-
- yaw moment.
-
- pitching moment.
Measured in units of moment.
| Data types |
|
| Complex numbers support |
No |
Parameters
Parameters
# Reference area — characteristic area
Details
The characteristic area of an aircraft. It is measured in units of area. For aircraft, the wing area is usually taken as the characteristic area.
| Default value |
|
| Program usage name |
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| Tunable |
No |
| Evaluatable |
Yes |
# Reference span — mean aerodynamic chord of the wing
Details
The average aerodynamic chord of a wing. Measured in units of length.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
# Reference length — characteristic linear dimension
Details
The characteristic linear dimension of an aircraft. It is measured in units of length. For aircraft, the characteristic linear dimension is usually taken as the wingspan.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |