Re: [Orekit Users] ConstantThrustManeuver with DSSTPropagator?

[paulcefo <paulcefo@buffalo.edu>]

Joseph,

This is the 1973 paper which represents the first application of 
equinoctial mean elements to electric propulsion analysis.

Paul

--
Dr. Paul J. Cefola
Consultant in Aerospace Systems, Spaceflight Mechanics, & Astrodynamics
Adjunct Faculty, Dept. of Mechanical and Aerospace Engineering, 
University at Buffalo (SUNY)

4 Moonstone Way
Vineyard Haven, MA 02568
USA

508-696-1884 (phone on Martha's Vineyard)
978-201-1393 (cell)

paulcefo@buffalo.edu
paul.cefola@gmail.com

On 03/24/2016 4:22 pm, Huwaldt, Joseph wrote:
> Paul,
>
> Yes, exactly!  We were excited when we found the DSSTPropagator in
> Orekit for just this reason.  Then we were perplexed when we couldn’t
> find an existing propulsion model for it.
>
> Ad astra,
>
> Joseph Huwaldt
>
>
> > On Mar 24, 2016, at 3:59 AM, paulcefo <paulcefo@buffalo.edu> wrote:
> >
> > Good morning,
> >
> > I agree with Luc that numerical averaging could be applied.
> >
> > I would like to note also that modeling electric propulsion maneuvers 
> > was one of the very first applications of the algorithms that later 
> > evolved to be the DSST.  See  the work by Ted Edelbaum, Harvey Malcow, 
> > and Les Sackett in the '70s at the Draper Lab on orbit raising.  The 
> > context was 'orbit raising' from LEO to GEO.
> >
> > Electric propulsion and DSST are a natural mix when long duration 
> > (many revs) electric propulsion maneuvers are considered.
> >
> > Also, one of the contributors to the DSST, Wayne McClain,  worked the 
> > issue of finite burn maneuvers.
> >
> > I will try to dig out these two refs later today.
> >
> > regards,
> >
> > Paul
> >
> >
> > --
> > Dr. Paul J. Cefola
> > Consultant in Aerospace Systems, Spaceflight Mechanics, & 
> > Astrodynamics
> > Adjunct Faculty, Dept. of Mechanical and Aerospace Engineering, 
> > University at Buffalo (SUNY)
> >
> > 4 Moonstone Way
> > Vineyard Haven, MA 02568
> > USA
> >
> > 508-696-1884 (phone on Martha's Vineyard)
> > 978-201-1393 (cell)
> >
> > paulcefo@buffalo.edu
> > paul.cefola@gmail.com
> >
> > On 03/24/2016 4:36 am, MAISONOBE Luc wrote:
> > > Joseph Huwaldt <joseph.huwaldt@dynetics.com> a écrit :
> > > > Greetings.
> > > Hi Joseph,
> > > > Is there a way to use a ConstantThrustManeuver with a 
> > > > DSSTPropagator?
> > > > We have a low thrust propulsion system that we would like to run out 
> > > > for
> > > > months at a time.  Without the propulsion, the DSSTPropagator works 
> > > > well for
> > > > us in this scenario, but as far as I can tell, I have to switch to a
> > > > NumericalPropagator to use a thrust model (either impulsive or 
> > > > constant
> > > > thrust).  Is that correct?
> > > Impulsive maneuver should work with all propagator, including DSST. 
> > > It
> > > mainly works by resetting the state at maneuver time during 
> > > propagation,
> > > inserting conversions from/to Cartesian orbit if needed.
> > > I thought I had already added an intermediate case between impulsive 
> > > and
> > > continuous maneuvers, something that should have been called 
> > > SplitManeuver
> > > or something like that. However, I cannot find it any more :-(, it 
> > > was  probably
> > > a dream ... Anyway, this would be simple to do, the idea was to split 
> > > a
> > > long maneuver in several smaller impulses. This would work well for 
> > > classical
> > > maneuvers like for exemple apogee firing during geostationary LEOP, 
> > > but I am
> > > not sure it could scale up to months durations efficiently.
> > > However, there is something that may be worth trying!
> > > When we implemented short period terms in DSST, we added a feature 
> > > that
> > > allows DSSTPropagator to reuse some force models really implemented
> > > for NumericalPropagator, i.e. models that only compute an 
> > > acceleration.
> > > You can look for example at AbstractGaussianContribution, which 
> > > implements
> > > DSSTForceModel and therefore can be fully handled by DSSTPropagator. 
> > > This
> > > class delegates acceleration computation to any ForceModel passed at
> > > construction. So you *could* create a DSSTContinuousManeuver class
> > > that would extend AbstractGaussianContribution and delegate to
> > > ConstantThrustManeuver! With this setting, you would have a maneuver
> > > modeled by DSST, and both mean and short periodic terms would be 
> > > computed
> > > (they are estimated thanks to Gaussian quadratures).
> > > Well, this solution would be highly experimental! I do not think it 
> > > would
> > > be really accurate if thrust is high, but for electric propulsion, it 
> > > may
> > > be worth trying.
> > > Incidentally, the SOCIS 2016 program by ESA has just started and they
> > > ask for mentor to propose subjects. Adding this maneuver model for 
> > > DSST
> > > in Orekit would be a great subject for a student this summer, and a 
> > > great
> > > paper subject after that.
> > > What do you think?
> > > best regards,
> > > Luc
> > > > Thanks!
> > > > Joseph Huwaldt
> > > > Dynetics, Inc.
> > > > Huntsville, AL
> > > > USA
>
>
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