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

Class AbstractCartesianEnergy

java.lang.Object

org.orekit.control.indirect.adjoint.cost.AbstractCartesianEnergy

All Implemented Interfaces:

CartesianCost, EventDetectorsProvider

Direct Known Subclasses:

BoundedCartesianEnergy, UnboundedCartesianEnergy, UnboundedCartesianEnergyNeglectingMass

public abstract class AbstractCartesianEnergy
extends Object
implements CartesianCost

Abstract class for energy cost with Cartesian coordinates. An energy cost is proportional to the integral over time of the 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.

Since:

12.2

Author:

Romain Serra

See Also:

CartesianCost

Field Summary

Fields inherited from interface org.orekit.propagation.events.EventDetectorsProvider

DATATION_ACCURACY

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractCartesianEnergy(String name, double massFlowRateFactor)	Constructor.

Method Summary

Modifier and Type	Method	Description
String	getAdjointName()	Getter for adjoint vector name.
protected double	getAdjointVelocityNorm(double[] adjointVariables)	Computes the Euclidean norm of the adjoint velocity vector.
protected <T extends CalculusFieldElement<T>> T	getFieldAdjointVelocityNorm(T[] adjointVariables)	Computes the Euclidean norm of the adjoint velocity vector.
double	getMassFlowRateFactor()	Getter for mass flow rate factor.

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, getFieldHamiltonianContribution, getFieldThrustAccelerationVector, getHamiltonianContribution, getThrustAccelerationVector, updateAdjointDerivatives, updateFieldAdjointDerivatives

Methods inherited from interface org.orekit.propagation.events.EventDetectorsProvider

getEventDetectors, getEventDetectors, getFieldEventDetectors, getFieldEventDetectors

Constructor Detail

AbstractCartesianEnergy

protected AbstractCartesianEnergy(String name,
                                  double massFlowRateFactor)

Constructor.

Parameters:

name - name

massFlowRateFactor - mass flow rate factor

Method Detail

getAdjointName

public String getAdjointName()

Getter for adjoint vector name.

Specified by:

getAdjointName in interface CartesianCost

Returns:

name

getMassFlowRateFactor

public double getMassFlowRateFactor()

Getter for mass flow rate factor. It is negated and multiplied by the thrust force magnitude to obtain the mass time derivative. The fact that it is a constant means that the exhaust speed is assumed to be independent of time.

Specified by:

getMassFlowRateFactor in interface CartesianCost

Returns:

mass flow rate factor

getAdjointVelocityNorm

protected double getAdjointVelocityNorm(double[] adjointVariables)

Computes the Euclidean norm of the adjoint velocity vector.

Parameters:

adjointVariables - adjoint vector

Returns:

norm of adjoint velocity

getFieldAdjointVelocityNorm

protected <T extends CalculusFieldElement<T>> T getFieldAdjointVelocityNorm(T[] adjointVariables)

Computes the Euclidean norm of the adjoint velocity vector.

Type Parameters:

T - field type

Parameters:

adjointVariables - adjoint vector

Returns:

norm of adjoint velocity