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

Class CartesianFlightDurationCost

java.lang.Object

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

org.orekit.control.indirect.adjoint.cost.CartesianFlightDurationCost

All Implemented Interfaces:

CartesianCost

public class CartesianFlightDurationCost
extends AbstractCartesianCost

Class for minimizing the flight duration (a.k.a. time of flight) with Cartesian coordinates. It is the integral over time of the constant one. The control is assumed to be bounded. It also assumes that no external acceleration depends on mass. If the mass flow rate factor is zero, then there is no adjoint for the mass.

Since:

13.0

Author:

Romain Serra

See Also:

CartesianCost

Constructor Summary

Constructors

Constructor	Description
CartesianFlightDurationCost(String name, double massFlowRateFactor, double maximumThrustMagnitude)	Constructor.

Method Summary

Modifier and Type	Method	Description
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

getAdjointDimension, 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

getCostDerivativeProvider, getEventDetectors

Constructor Detail

CartesianFlightDurationCost

public CartesianFlightDurationCost(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

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