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

Class BoundedCartesianEnergy

java.lang.Object

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

org.orekit.control.indirect.adjoint.cost.BoundedCartesianEnergy

All Implemented Interfaces:

CartesianCost

public class BoundedCartesianEnergy
extends AbstractCartesianCost

Class for bounded energy cost with Cartesian coordinates. An energy cost is proportional to the integral over time of the squared Euclidean norm of the control vector, often scaled with 1/2. This type of cost is not optimal in terms of mass consumption, however its solutions showcase a smoother behavior favorable for convergence in shooting techniques. Here, the control vector is chosen as the thrust force divided by the maximum thrust magnitude and expressed in the propagation frame. It has a unit Euclidean norm.

Since:

12.2

Author:

Romain Serra

See Also:

UnboundedCartesianEnergy

Constructor Summary

Constructors

Constructor	Description
BoundedCartesianEnergy(String name, double massFlowRateFactor, double maximumThrustMagnitude)	Constructor.
BoundedCartesianEnergy(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 of 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.
protected Vector3D	getThrustDirection(double[] adjointVariables)	Computes the direction of thrust.
protected double	getThrustForceNorm(double[] adjointVariables, double mass)	Computes the Euclidean norm of the thrust force.
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

getAdjointName, getAdjointVelocityNorm, getFieldAdjointVelocityNorm, 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

getAdjointDimension

Constructor Detail

BoundedCartesianEnergy

public BoundedCartesianEnergy(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

BoundedCartesianEnergy

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

Constructor.

Parameters:

name - name

massFlowRateFactor - mass flow rate factor

maximumThrustMagnitude - maximum thrust magnitude

Method Detail

getMaximumThrustMagnitude

public double getMaximumThrustMagnitude()

Getter for maximum thrust magnitude.

Returns:

maximum thrust

Since:

13.0

getThrustForceNorm

protected double getThrustForceNorm(double[] adjointVariables,
                                    double mass)

Computes the Euclidean norm of the thrust force.

Parameters:

adjointVariables - adjoint vector

mass - mass

Returns:

norm of thrust

getEventDetectors

public Stream<EventDetector> getEventDetectors()

Get the detectors needed for propagation.

Returns:

event detectors

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

getThrustDirection

protected Vector3D getThrustDirection(double[] adjointVariables)

Computes the direction of thrust.

Parameters:

adjointVariables - adjoint vector

Returns:

thrust direction

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 of the cost function.

Parameters:

adjointVariables - adjoint vector

mass - mass

Returns:

contribution to Hamiltonian