[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Orekit Users] Adding a Constant Thrust Maneuver while propagating.


MAISONOBE Luc <luc.maisonobe@c-s.fr> a écrit :


Pau Hebrero Casasayas <Pau.Hebrero-Casasayas@scisys.de> a écrit :


Hi Luc,


Hi Pau,



Thanks a lot for the reply.
I don't know the maneuver date before the propagation start, is there another way around it? 

Just as I said in the mail: build the maneuver during propagation
and add the events to the propagator at that time, something
along the lines of:

    ConstantThrustManeuver ctm = new ConstantThrustManeuver(...);
    ctm.getEventsDetectors().foreach(d -> propagator.addEventDetector(d));


To be more clear, as the propagator adds the embedded detectors only at
propagation start, if you need a new detector after start, you have to
add it yourself by calling addDetector explicitly, just as you would do
for a detector that is not embedded within a force model.

I don't know if it will work, however, as there may be some glitches as
there is no previous state. You will have to test it by yourself, I can
barely help more at this stage.

best regards,
Luc



Luc



Thanks again,
Pau

----------------------------------------------------------------------------------------
Pau Hebrero Casasayas
Software Engineer
Space
SCISYS Deutschland GmbH
T: +49 6151 4285343 | F: +49 6151 4285399
E: Pau.Hebrero-Casasayas@scisys.de | http://www.space.scisys.de
SCISYS Deutschland GmbH, Darmstadt Office, Europaplatz 4, 64293 Darmstadt, Germany Management Board: Prof. Dr. Klaus-G. Meng (Chairman), Sandra Krewerth, Ulli Leibnitz, Dr. Karl-W. Pieper, Dr. Horst Wulf Registered Office Bochum HRB 13694, VAT-IdNo DE 813242674, WEEE-Reg.-No. DE 74530735 
-----Original Message-----
From: orekit-users-request@orekit.org [mailto:orekit-users-request@orekit.org] On Behalf Of MAISONOBE Luc 
Sent: 10 April 2018 20:08
To: orekit-users@orekit.org
Subject: Re: [Orekit Users] Adding a Constant Thrust Maneuver while propagating. 


Pau Hebrero Casasayas <Pau.Hebrero-Casasayas@scisys.de> a écrit :


Hi,


Hi Pau,



I am propagating from a time A to a time B, and checking for events.
When one event is triggered, a ConstantThrustManeuver is computed and
added to the propagator (with a small offset with respect to the
current propagation epoch).

The propagator seems not to take into account the constant thrust
maneuver in the follow-up propagation.

I have done the same but with a ThirdBodyAttraction (added based on an
event trigger), and it does take it into account for the rest of the
propagation.

I know that this topic was tackle in May by John Reilly and Evan Ward,
we have followed the recommendation to use ConstantThrustManeuver to
solve it, but it looks like it does not.
Could anybody help?
Try to add the events detectors embedded with the maneuver by yourself into the propagator when you add the maneuvers. The propagator loops over all force models to gather the force model specific detectors at propagation start, but not afterwards, so if you add the maneuver after maneuver start, it will never be triggered. 

best regards,
Luc



Many thanks in advance,

Pau

___________________________________________________________

Pau Hebrero Casasayas
Software Engineer
Space
SCISYS Deutschland GmbH
T:  +49 6151 4285343 | F:  +49 6151 4285399
E:
Pau.Hebrero-Casasayas@scisys.de<mailto:Pau.Hebrero-Casasayas@scisys.de

| http://www.space.scisys.de


SCISYS Deutschland GmbH, Darmstadt Office, Europaplatz 4, 64293
Darmstadt, Germany Management Board: Prof. Dr.-Ing. Klaus-G. Meng
(Chairman), Sandra Krewerth, Ulli Leibnitz, Dr. Karl-W. Pieper, Dr.
Horst Wulf Registered Office Bochum HRB 13694, VAT-Id-No. DE
813242674, WEEE-Reg.-No. DE 74530735