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

Class UnboundedCartesianEnergyNeglectingMass

java.lang.Object

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

org.orekit.control.indirect.adjoint.cost.UnboundedCartesianEnergyNeglectingMass

All Implemented Interfaces:

CartesianCost

public class UnboundedCartesianEnergyNeglectingMass
extends AbstractCartesianCost

Class for unbounded energy cost with Cartesian coordinates neglecting the mass consumption. Under this assumption, the mass is constant and there is no need to consider the corresponding adjoint variable. Here, the control vector is chosen as the acceleration given by thrusting, expressed in the propagation frame. This leads to the optimal thrust force being equal to the adjoint velocity vector times the mass.

Since:

12.2

Author:

Romain Serra

Constructor Summary

Constructors

Constructor	Description
UnboundedCartesianEnergyNeglectingMass(String name)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	getAdjointDimension()	Getter for adjoint vector dimension.
Stream<EventDetector>	getEventDetectors()	Get the detectors needed for propagation.
double	getHamiltonianContribution(double[] adjointVariables, double mass)	Computes the Hamiltonian contribution of the cost function.
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

getAdjointName, getAdjointVelocityNorm, getFieldAdjointVelocityNorm, getMassFlowRateFactor

Methods inherited from class java.lang.Object

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

Constructor Detail

UnboundedCartesianEnergyNeglectingMass

public UnboundedCartesianEnergyNeglectingMass(String name)

Constructor.

Parameters:

name - name

Method Detail

getAdjointDimension

public int getAdjointDimension()

Getter for adjoint vector dimension. Default is 7 (six for Cartesian coordinates and one for mass).

Returns:

adjoint dimension

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 of the cost function.

Parameters:

adjointVariables - adjoint vector

mass - mass

Returns:

contribution to Hamiltonian

getEventDetectors

public Stream<EventDetector> getEventDetectors()

Get the detectors needed for propagation.

Returns:

event detectors