Admin : Page créée avec « == Standard Impulsive maneuvers == This kind of maneuver consists in modelizing a maneuver as an instantaneous modification of the velocity. So, to define it, we must set... »

2020-08-17T08:53:29Z

Page créée avec « == Standard Impulsive maneuvers == This kind of maneuver consists in modelizing a maneuver as an instantaneous modification of the velocity. So, to define it, we must set... »

Nouvelle page

== Standard Impulsive maneuvers ==

This kind of maneuver consists in modelizing a maneuver as an instantaneous modification of the velocity. So, to define it, we must set, at least:
# an event that will determine that the maneuver will occur;
# three components, corresponding to the velocity increment;
# the specific impulse in order to be able to calculate the mass decrease due to the maneuver (we do not use here the [{{JavaDoc4.5.1}}/fr/cnes/sirius/patrius/assembly/properties/PropulsiveProperty.html PropulsiveProperty]);
# as a consequence of the mass evolution, a [{{JavaDoc4.5.1}}/fr/cnes/sirius/patrius/assembly/models/MassModel.html MassModel] and the part of this model where we will use ergols mass (here a specific tank).

Be careful that, when the maneuver direction is expressed in the vehicle frame, it will be mandatory to define an attitude when propagating the orbit !

In the example below, we will define a 20 m/s ΔV activated at the apogee of the orbit.

'''Code examples:'''
* [[ImpulsiveManeuverVehicleFrame_4.5.1|Impulsive maneuver defined versus a vehicle frame]]
* [[ImpulsiveManeuverSpecificFrame_4.5.1|Impulsive maneuver defined versus a specific frame (GCRF)]]
* [[ImpulsiveManeuverLOFFrame_4.5.1|Impulsive maneuver defined versus a LOF frame (TNW)]]

== Impulsive maneuvers using orbital incréments ==

Since V4.5.1, '''PATRIUS''' allows to define impulsive maneuvers with some orbital increments as input rather than giving directly a Velocity increment. The three possibilities are:

* on semi-major axis
* on eccentricity (and semi-major axis eventually)
* on inclination (and semi-major axis eventually)

There is no specific tutorial on this page but we can see examples of such use in the [[Tutorials_4.1_Propagator|propagator page]]

== Continuous maneuvers ==

This time, a continuous thrust maneuver is no more considered as an impulsive one but as a more realistic one with a given duration. So to define it, we must set, at least:
# information about the start and the end of the maneuver
# the thrust direction
# the thrust level and the specific impulse via [{{JavaDoc4.5.1}}/fr/cnes/sirius/patrius/assembly/properties/PropulsiveProperty.html PropulsiveProperty]
# as a consequence of the mass evolution, a [{{JavaDoc4.5.1}}/fr/cnes/sirius/patrius/assembly/models/MassModel.html MassModel] and the part of this model where we will use ergols mass (here a specific tank)

'''Code examples:'''
* [[ContinuousManeuverByDuration_4.5.1|Continuous maneuver defined in duration]]
* [[ContinuousManeuverByEvents_4.5.1|Continuous maneuver defined by events]]

== Sequence of maneuvers ==

Such a sequence allows to group several maneuvers (impulsive or continuous ones) in a single object synthetizing a maneuver strategy. In fact, it is actually very simple to build it once each maneuver has been defined. We only have:
# to set a value in seconds for the minimum allowed time between a continuous maneuver and the next maneuver
# to set a value in seconds for the minimum allowed time between an impulse maneuver and the next maneuver
# to add each maneuver by using the add() method

In the example below, we have taken the impulsive maneuver build in the [[#Impulsive maneuvers|Impulsive maneuvers tutorial ]] and the continuous maneuver taken from the [[#Continuous maneuvers|Continuous maneuvers tutorial]] , putting them together in a sequence.

'''Code example:''' [[SequenceOfManeuvers_4.5.1|Sequence of maneuvers]]

[[Category:Tutorials 4.5.1]]

Tutorials 4.5.1 Maneuvers - Historique des versions

Admin : Page créée avec « == Standard Impulsive maneuvers == This kind of maneuver consists in modelizing a maneuver as an instantaneous modification of the velocity. So, to define it, we must set... »

Admin : Page créée avec « == Standard Impulsive maneuvers == This kind of maneuver consists in modelizing a maneuver as an instantaneous modification of the velocity. So, to define it, we must set... »