disturbances_simple_earth Class Reference

Generates a simple disturbance model for earth orbit. More...

#include <disturbances_simple_earth.h>

Inherits dsim_model.

Public Member Functions
	disturbances_simple_earth (dsim_model_setup *setup)
	Constructor.
	~disturbances_simple_earth ()
	Destructor.
void	initialize_data ()
	Initialize outlets and output variables. More...
void	initialization_complete ()
	Finish initialization.
void	initialize_timestep ()
	Computation done prior to numerical integration. More...
void	rhs (double t, double jd)
	Computation done during numerical integration.
void	complete_timestep ()
	Computation done after numerical integration.

Protected Attributes
Outputs
dsim_variable	force_total_dsim
	The total force.
dsim_variable	torque_total_dsim
	The total torque.
dsim_variable	force_solar_dsim
	The solar force.
dsim_variable	torque_solar_dsim
	The solar torque.
dsim_variable	force_albedo_dsim
	The albedo force.
dsim_variable	torque_albedo_dsim
	The albedo torque.
dsim_variable	force_radiation_dsim
	The radiation force.
dsim_variable	torque_radiation_dsim
	The radiation torque.
dsim_variable	force_aero_dsim
	The aero force.
dsim_variable	torque_aero_dsim
	The aero torque.
dsim_variable	force_rf_dsim
	The RF force.
dsim_variable	torque_rf_dsim
	The RF torque.
dsim_variable	torque_gg_dsim
	The gravity gradient torque.
dsim_variable	torque_magnetic_dsim
	The magnetic torque.
Parameters
The surface area
dsim_variable	area_dsim
dsim_variable	residual_dipole_dsim
	The residual dipole.
dsim_variable	center_of_pressure_dsim
	The center of pressure.
dsim_variable	rf_vector_dsim
	The RF power vector.
dsim_variable	rf_position_dsim
	The surface area.
dsim_variable	solarFluxFile_dsim
	The solar flux file.
Commands
dsim_variable	solar_on_dsim
dsim_variable	albedo_on_dsim
dsim_variable	radiation_on_dsim
dsim_variable	aero_on_dsim
dsim_variable	rf_on_dsim
dsim_variable	gg_on_dsim
dsim_variable	magnetic_on_dsim
Parent connections
dsim_variable	position_dsim
	The parent position.
dsim_variable	quaternion_dsim
	The parent quaternion.
dsim_variable	velocity_dsim
	The parent quaternion.
dsim_variable	center_of_mass_dsim
	The center of mass.
dsim_variable	inertia_dsim
	The inertia.

Detailed Description

Generates a simple disturbance model for earth orbit.

Computes external disturbances in Earth orbit due to solar pressure, albedo, radiation pressure, aerodynamic drag, radio frequency pressure, gravity gradient torques, and residual magnetic dipole.

The inputs to this model are a file with vertices and faces. Each face is defined on one row by the three vertices (9 elements), coefficient of drag, optical properties (4 elements) in the order: [absorbed specular diffuse transmitted]. The optical coefficients must sum to one. The outward normals are computed using the right-hand-rule based on the face array.

This is a single-sided model. If the cosine of the angle to the light source is negative, the face is assumed facing away from the sun and the force on that face is zero. Shadowing is not modeled.

Member Function Documentation

initialize_data()

void disturbances_simple_earth::initialize_data

(

)

Initialize outlets and output variables.

The total ECI force vector (3,1), in N.

initialize_timestep()

void disturbances_simple_earth::initialize_timestep

(

)

Computation done prior to numerical integration.

Compute the solar force and torque.

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The documentation for this class was generated from the following files:

• disturbances_simple_earth.h
• disturbances_simple_earth.cc