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
The vector is 6 by 1
Details
The coefficients of the components of the aerodynamic force and moment along the axes in the associated coordinate system, specified as a vector. Vector elements:
-
— coefficient of longitudinal force.
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— the coefficient of normal force.
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— coefficient of lateral force.
-
— roll moment coefficient.
-
— coefficient of yaw moment.
-
— the coefficient of pitch moment.
| Data types |
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| Complex numbers support |
No |
#
qbar
—
high-speed pressures
a 3-by-1 vector
Details
The velocity pressures calculated from the components of the speed of the aircraft along the axes of the associated coordinate system, set as a vector.
| Data types |
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| Complex numbers support |
No |
#
CG
—
coordinates of the center of gravity
a 3-by-1 vector
Details
Coordinates of the aircraft’s center of gravity. They are measured in units of length, specified as a vector.
| Data types |
|
| Complex numbers support |
No |
#
CP
—
coordinates of the pressure center
a 3-by-1 vector
Details
The coordinates of the aircraft’s pressure center, set as a vector. They are measured in units of length.
| Data types |
|
| Complex numbers support |
No |
Output
#
Fbody
—
aerodynamic forces
a 3-by-1 vector
Details
The components of the aerodynamic force relative to the center of mass of the aircraft in the associated coordinate system, specified as a vector. Vector elements:
-
— longitudinal force.
-
— normal strength.
-
— lateral force.
They are measured in units of force.
| Data types |
|
| Complex numbers support |
No |
#
Mbody
—
aerodynamic moments
a 3-by-1 vector
Details
The components of the aerodynamic moment relative to the center of mass of the aircraft in the associated coordinate system, specified as a vector. Vector elements:
-
— roll moment.
-
— the moment of yawing.
-
— the moment of pitch.
They are measured in units of moment.
| Data types |
|
| Complex numbers support |
No |
Parameters
Main
# 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 |
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| 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 |
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| Program usage name |
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| 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 |