fr.cnes.sirius.patrius.assembly.models

Class GlobalDragCoefficientProvider

java.lang.Object

fr.cnes.sirius.patrius.assembly.models.GlobalDragCoefficientProvider

All Implemented Interfaces:

DragCoefficientProvider

public class GlobalDragCoefficientProvider
extends Object
implements DragCoefficientProvider

Implementation of DragCoefficientProvider computing aero coefficients as functions of type TrivariateFunction. The service #getCoefficients(Vector3D, AtmosphereData, Assembly) is implemented using these functions in which a 3D interpolation (linear or by spline) is performed. The considered interpolation point has (azimuth, elevation, s) coordinates, s being the velocity factor, such that :

• the azimuth is the angle between X satellite axis and the projection of the relative velocity in satellite plane (XY).
• the elevation is the angle between the relative velocity and its projection in satellite plane (XY), in the satellite's frame.
• s is computed knowing :

   s2  = || V_rel ||2 / 2r T_atmos
   

This model uses 3 parameters (azimuth, elevation, s factor) to compute 12 output being the aero coefficients :

SC_abs (x, y, z): absorption coefficients SC_spec (x, y, z): specular coefficients SC_diff_av (x, y, z): diffuse coefficients (front face) SC_diff_ar (x, y, z): diffuse coefficients (rear face)

Since:

3.4

Version:

$Id: GlobalDragCoefficientProvider.java 18195 2017-10-13 11:49:12Z bignon $

Author:

rodriguest

See Also:

InterpolatedDragReader

Concurrency :

thread-safe