GlobalDragCoefficientProvider (parent patrimoine de base SIRIUS 4.1 API)

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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:: $Id$
Author:: rodriguest
See Also:: InterpolatedDragReader
Concurrency :: thread-safe

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class GlobalDragCoefficientProvider.INTERP
Enumerate to choose the way to interpolate.

Constructor Summary

Constructors
Constructor and Description

GlobalDragCoefficientProvider(GlobalDragCoefficientProvider.INTERP method, String filePath)
Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`DragCoefficient`	`getCoefficients(Vector3D relativeVelocity, AtmosphereData atmoData, Assembly assembly)` Provides drag coefficient (x surface).

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - GlobalDragCoefficientProvider
```
public GlobalDragCoefficientProvider(GlobalDragCoefficientProvider.INTERP method,
                                     String filePath)
                              throws IOException,
                                     PatriusException
```
    Constructor.
    
    Parameters:
    
    method - the method chosen for interpolation : could be linear or by splines
    
    filePath - absolute path to the file containing the aero coefficients
    
    Throws:
    
    IOException - if file could not be read.
    
    PatriusException - thrown if number of input + output in file is not 15 or some lines are missing
- Method Detail
  - getCoefficients
```
public DragCoefficient getCoefficients(Vector3D relativeVelocity,
                                       AtmosphereData atmoData,
                                       Assembly assembly)
```
    Description copied from interface: DragCoefficientProvider
    
    Provides drag coefficient (x surface).
    
    Specified by:
    
    getCoefficients in interface DragCoefficientProvider
    
    Parameters:
    
    relativeVelocity - relative velocity of atmosphere with respect to spacecraft in satellite frame
    
    atmoData - atmosphere data
    
    assembly - assembly
    
    Returns:
    
    drag coefficient (x surface) in satellite frame

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