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

Class LogarithmicBarrierCartesianFuel

java.lang.Object

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

org.orekit.control.indirect.adjoint.cost.PenalizedCartesianFuelCost

org.orekit.control.indirect.adjoint.cost.LogarithmicBarrierCartesianFuel

All Implemented Interfaces:

CartesianCost

public class LogarithmicBarrierCartesianFuel
extends PenalizedCartesianFuelCost

Fuel cost penalized with a logarithmic term, which is a barrier so is not defined for epsilon equal to 0 or 1.

Since:

13.0

Author:

Romain Serra

Constructor Summary

Constructors

Constructor	Description
LogarithmicBarrierCartesianFuel(String name, double massFlowRateFactor, double maximumThrustMagnitude, double epsilon)	Constructor.

Method Summary

Modifier and Type	Method	Description
double	evaluatePenaltyFunction(double controlNorm)	Evaluate the penalty term (without the weight), assumed to be a function of the control norm.
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.PenalizedCartesianFuelCost

getEpsilon, getHamiltonianContribution, getMaximumThrustMagnitude, getThrustDirection

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, getEventDetectors

Constructor Detail

LogarithmicBarrierCartesianFuel

public LogarithmicBarrierCartesianFuel(String name,
                                       double massFlowRateFactor,
                                       double maximumThrustMagnitude,
                                       double epsilon)

Constructor.

Parameters:

name - adjoint name

massFlowRateFactor - mass flow rate factor

maximumThrustMagnitude - maximum thrust magnitude

epsilon - penalty weight

Method Detail

evaluatePenaltyFunction

public double evaluatePenaltyFunction(double controlNorm)

Evaluate the penalty term (without the weight), assumed to be a function of the control norm.

Specified by:

evaluatePenaltyFunction in class PenalizedCartesianFuelCost

Parameters:

controlNorm - Euclidean norm of control vector

Returns:

penalty function

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