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

Class FieldCartesianFlightDurationCost<T extends CalculusFieldElement<T>>

java.lang.Object

org.orekit.control.indirect.adjoint.cost.FieldAbstractCartesianCost<T>

org.orekit.control.indirect.adjoint.cost.FieldCartesianFlightDurationCost<T>

Type Parameters:

T - type of the field elements

All Implemented Interfaces:

FieldCartesianCost<T>

public class FieldCartesianFlightDurationCost<T extends CalculusFieldElement<T>>
extends FieldAbstractCartesianCost<T>

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
• CartesianFlightDurationCost

Nested Class Summary

Nested classes/interfaces inherited from class org.orekit.control.indirect.adjoint.cost.FieldAbstractCartesianCost

FieldAbstractCartesianCost.FieldSwitchFunction

Constructor Summary

Constructors

Constructor	Description
FieldCartesianFlightDurationCost(String name, T massFlowRateFactor, T maximumThrustMagnitude)	Constructor.

Method Summary

Modifier and Type	Method	Description
T	getFieldHamiltonianContribution(T[] adjointVariables, T mass)	Computes the Hamiltonian contribution to the cost function.
FieldVector3D<T>	getFieldThrustAccelerationVector(T[] adjointVariables, T mass)	Computes the thrust acceleration vector in propagation frame from the adjoint variables and the mass.
T	getMaximumThrustMagnitude()	Getter for maximum thrust magnitude.
CartesianFlightDurationCost	toCartesianCost()	Method returning equivalent in non-Field.
void	updateFieldAdjointDerivatives(T[] adjointVariables, T mass, T[] adjointDerivatives)	Update the adjoint derivatives if necessary.

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

buildSwitchDetector, getAdjointDimension, getAdjointName, 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.FieldCartesianCost

getCostDerivativeProvider, getFieldEventDetectors

Constructor Details

FieldCartesianFlightDurationCost

public FieldCartesianFlightDurationCost(String name,
 T massFlowRateFactor,
 T maximumThrustMagnitude)

Constructor.

Parameters:

name - name

massFlowRateFactor - mass flow rate factor

maximumThrustMagnitude - maximum thrust magnitude

Method Details

getMaximumThrustMagnitude

public T getMaximumThrustMagnitude()

Getter for maximum thrust magnitude.

Returns:

maximum thrust

getFieldThrustAccelerationVector

public FieldVector3D<T> getFieldThrustAccelerationVector(T[] adjointVariables,
 T 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

updateFieldAdjointDerivatives

public void updateFieldAdjointDerivatives(T[] adjointVariables,
 T mass,
 T[] adjointDerivatives)

Update the adjoint derivatives if necessary.

Parameters:

adjointVariables - adjoint vector

mass - mass

adjointDerivatives - derivatives to update

getFieldHamiltonianContribution

public T getFieldHamiltonianContribution(T[] adjointVariables,
 T 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

toCartesianCost

public CartesianFlightDurationCost toCartesianCost()

Method returning equivalent in non-Field.

Returns:

cost function for non-Field applications