0 - FTP Directory Listing - Nato
0 - FTP Directory Listing - Nato
0 - FTP Directory Listing - Nato
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
21-10<br />
d'iugrnmter nu cours des itdrntions. favorinant ninsi une<br />
baisw du coat au dtriment de la masse totalc de chugs<br />
utile p ldc tur cette orbite.<br />
4 CONCLUSION<br />
-Figure 16 -<br />
Ceo deux cxemples ont monvd l'inttrit doptirniser de f40n<br />
couplh lo rnontte et lei manoeuvres dons le cas de<br />
1.ncanmu multiples.<br />
Dms lo cas du lrncement double. I'optirnisation a pcrmis<br />
deffacw la mim A poste de deux satellites dobscnation au<br />
moyen de motews drpogte rdilistes. 1<br />
Pow 10 hnmmnt b la amtcllation. on a pu gngner. grke<br />
h Ibptimisntion. mLtT& 7 et 10% par rapport A la mise A<br />
posle depuis me CiTO 7' Clansique.<br />
Grb b la divereit6 des contrninteg -fncilernent activablcs-<br />
er nux nomhuscn fonctione collu. M grand nomhe de cas<br />
peuvent Ctre trait& pnr le programme. Linttrit de cctte<br />
mtlhode dopimisation repose sur le fait qu'elle put gtrcr<br />
un grand nomh de porm&tres (pticulihement dans le cas<br />
des manoeuvres bi-imgulsionnellcs). Cvifarit ainsi un<br />
balayage futidieux de IOUICS Ics combinaisons possibles.<br />
111<br />
(21<br />
[3]<br />
C. Aumrr~son. Ph. Landiech: "MCthodc itCrative de<br />
type gradient projet6 gCnCralisC pour I'optirnisation<br />
pnrarndtriquc et fonctionnelle de systkrnes<br />
dynuniques soumis B des contiaintes."<br />
N.T. 1988-9 ONERA<br />
Ph. Landicch. C. Aumasson: "Month optimale du<br />
tnncew Arione V-W avcc contrainte de rciomMc du<br />
prrmim Ctnge."<br />
R.T. no 21/61 15 SY - ONERA 1986<br />
H.Bnmng.er. 1. Bouchard. T. Michal: "Systkrne de<br />
nrvigntion par srtellites A couvcrtuie europCennc."<br />
Communication AGARD 1992, B~~ellci Session<br />
111: TacSrt applications- System<br />
Question: My question concerns the eqtivalence constraint<br />
you use in order to limit to 5% the gap between each<br />
satellite propellant mass and their average value.<br />
Is it possible to minimize the maximum value of the<br />
propellant masses instead of activating this constraint?<br />
Reply: The cost index (.i.e., minimizing the maximum<br />
of the propellant masses) may be considered as it<br />
is presented in the paper, and could have been Lsed<br />
in this case instead of trying to minimize the criterion<br />
(sum of the delta v) while activating the equivalence<br />
constraint. Never the less, the 5% margin allows a<br />
respective balance between the three satellite niasses<br />
without making them exactly equal (which might be<br />
too strong a constraint in this complex system where<br />
the launcher ascent phase and three bi-pulse maneuvers<br />
are simultaneously optimized).