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JSBSim Aerodynamics: Difference between revisions
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According to the JSBSim Manual, p.10, the body frame's Z axis points down.
(→Metrics: AeroRP is a vital metric but was not mentioned.) |
m (According to the JSBSim Manual, p.10, the body frame's Z axis points down.) |
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== Frames == | == Frames == | ||
JSBSim incorporates several frame of reference. The body frame and wind frame are the most important to the aerodynamic model. | JSBSim incorporates several frame of reference. The body frame and wind frame are the most important to the aerodynamic model. | ||
* '''Body XYZ''' The body frame uses the X axis for forward and aft, with + to the front. The Y axis is side to side with + to the right. The Z axis is up and down, with + being | * '''Body XYZ''' The body frame uses the X axis for forward and aft, with + to the front. The Y axis is side to side with + to the right. The Z axis is up and down, with + being down. The origin of this frame is the Center of Gravity (CG), about which the aircraft forces and moments are summed and the resulting accelerations are integrated to get velocities. | ||
* '''Wind XYZ''' The wind frame X-axis points directly into the relative wind. The Z-axis is perpendicular to the X-axis, and remains within the aircraft body axis XZ plane (also called the reference plane). The Y-axis completes a right hand coordinate system. The origin of this frame is the AeroRP. | * '''Wind XYZ''' The wind frame X-axis points directly into the relative wind. The Z-axis is perpendicular to the X-axis, and remains within the aircraft body axis XZ plane (also called the reference plane). The Y-axis completes a right hand coordinate system. The origin of this frame is the AeroRP. | ||