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

Interface CartesianCost

All Known Implementing Classes:

AbstractCartesianCost, BoundedCartesianEnergy, CartesianFlightDurationCost, CartesianFuelCost, LogarithmicBarrierCartesianFuel, PenalizedCartesianFuelCost, QuadraticPenaltyCartesianFuel, UnboundedCartesianEnergy, UnboundedCartesianEnergyNeglectingMass

public interface CartesianCost

Interface to definite cost function in the frame of Pontryagin's Maximum Principle using Cartesian coordinates. It provides the link between the optimal control and the adjoint variables. This relationship is obtained by maximizing the Hamiltonian. The choice of control vector impacts on it. Both standard (double type) and (Calculus)Field versions are to be implemented by inheritors.

Since:

12.2

Author:

Romain Serra

See Also:

• CartesianAdjointDerivativesProvider

Method Summary

Modifier and Type	Method	Description
int	getAdjointDimension()	Getter for adjoint vector dimension.
String	getAdjointName()	Getter for adjoint vector name.
default AdditionalDerivativesProvider	getCostDerivativeProvider(String name)	Get the derivatives provider to be able to integrate the cost function.
default Stream<EventDetector>	getEventDetectors()	Get the detectors needed for propagation.
double	getHamiltonianContribution(double[] adjointVariables, double mass)	Computes the Hamiltonian contribution to the cost function.
double	getMassFlowRateFactor()	Getter for mass flow rate factor.
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.

Method Details

getAdjointName

String getAdjointName()

Getter for adjoint vector name.

Returns:

adjoint vector name

getAdjointDimension

int getAdjointDimension()

Getter for adjoint vector dimension.

Returns:

adjoint dimension

getMassFlowRateFactor

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.

Returns:

mass flow rate factor

getThrustAccelerationVector

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

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

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

getEventDetectors

default Stream<EventDetector> getEventDetectors()

Get the detectors needed for propagation.

Returns:

event detectors

getCostDerivativeProvider

default AdditionalDerivativesProvider getCostDerivativeProvider(String name)

Get the derivatives provider to be able to integrate the cost function.

Parameters:

name - name of cost as additional state variable

Returns:

derivatives provider

Since:

13.0