Package org.orekit.control.indirect.adjoint.cost

Class CartesianFuelCost

java.lang.Object

org.orekit.control.indirect.adjoint.cost.AbstractCartesianCost

org.orekit.control.indirect.adjoint.cost.CartesianFuelCost

All Implemented Interfaces:

CartesianCost

public class CartesianFuelCost
extends AbstractCartesianCost

Class for fuel cost with Cartesian coordinates. It is the integral over time of the Euclidean norm of the thrust vector.

Since:

13.0

Author:

Romain Serra

See Also:

• CartesianCost

Constructor Summary

Constructors

Constructor	Description
CartesianFuelCost(String name, double massFlowRateFactor, double maximumThrustMagnitude)	Constructor with default detection settings.
CartesianFuelCost(String name, double massFlowRateFactor, double maximumThrustMagnitude, EventDetectionSettings eventDetectionSettings)	Constructor.

Method Summary

Modifier and Type	Method	Description
EventDetectionSettings	getEventDetectionSettings()	Getter for event detection settings.
Stream<EventDetector>	getEventDetectors()	Get the detectors needed for propagation.
double	getHamiltonianContribution(double[] adjointVariables, double mass)	Computes the Hamiltonian contribution to the cost function.
double	getMaximumThrustMagnitude()	Getter for maximum thrust magnitude.
Vector3D	getThrustAccelerationVector(double[] adjointVariables, double mass)	Computes the thrust acceleration vector in propagation frame from the adjoint variables and the mass.
void	updateAdjointDerivatives(double[] adjointVariables, double mass, double[] adjointDerivatives)	Update the adjoint derivatives if necessary.

Methods inherited from class org.orekit.control.indirect.adjoint.cost.AbstractCartesianCost

buildSwitchDetector, getAdjointDimension, getAdjointName, getAdjointVelocityNorm, getMassFlowRateFactor

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.orekit.control.indirect.adjoint.cost.CartesianCost

getCostDerivativeProvider

Constructor Details

CartesianFuelCost

public CartesianFuelCost(String name,
 double massFlowRateFactor,
 double maximumThrustMagnitude)

Constructor with default detection settings.

Parameters:

name - name

massFlowRateFactor - mass flow rate factor

maximumThrustMagnitude - maximum thrust magnitude

CartesianFuelCost

public CartesianFuelCost(String name,
 double massFlowRateFactor,
 double maximumThrustMagnitude,
 EventDetectionSettings eventDetectionSettings)

Constructor.

Parameters:

name - name

massFlowRateFactor - mass flow rate factor

maximumThrustMagnitude - maximum thrust magnitude

eventDetectionSettings - singularity event detection settings

Method Details

getMaximumThrustMagnitude

public double getMaximumThrustMagnitude()

Getter for maximum thrust magnitude.

Returns:

maximum thrust

getEventDetectionSettings

public EventDetectionSettings getEventDetectionSettings()

Getter for event detection settings.

Returns:

detection settings.

getThrustAccelerationVector

public Vector3D getThrustAccelerationVector(double[] adjointVariables,
 double mass)

Computes the thrust acceleration vector in propagation frame from the adjoint variables and the mass.

Parameters:

adjointVariables - adjoint vector

mass - mass

Returns:

thrust vector

updateAdjointDerivatives

public void updateAdjointDerivatives(double[] adjointVariables,
 double mass,
 double[] adjointDerivatives)

Update the adjoint derivatives if necessary.

Parameters:

adjointVariables - adjoint vector

mass - mass

adjointDerivatives - derivatives to update

getHamiltonianContribution

public double getHamiltonianContribution(double[] adjointVariables,
 double mass)

Computes the Hamiltonian contribution to the cost function. It equals the Lagrange-form integrand multiplied by -1.

Parameters:

adjointVariables - adjoint vector

mass - mass

Returns:

contribution to Hamiltonian

getEventDetectors

public Stream<EventDetector> getEventDetectors()

Get the detectors needed for propagation.

Returns:

event detectors