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SUMMARY:MOLTO-IT: A Multi-Objective Low-Thrust Optimization Tool for Inter
planetary Trajectories
DTSTART;VALUE=DATE-TIME:20181109T130000Z
DTEND;VALUE=DATE-TIME:20181109T133000Z
DTSTAMP;VALUE=DATE-TIME:20220528T223728Z
UID:indico-contribution-3860@indico.esa.int
DESCRIPTION:Speakers: DAVID MORANTE (Universidad Carlos III ( Madrid ))\nL
ow-thrust propulsion and gravity assists maneuvers are both well known to
provide sig- nificant benefits in terms of required propellant mass for in
terplanetary trajectories. However\, the propellant reduction achieved wit
h low-thrust engines\, when compared to their chemical counterparts\, come
s at the cost of a higher transfer time.\nTherefore\, the design and optim
ization of interplanetary missions has to be treated as a multi-objective
optimization problem. The goal is to determine the set of optimal trajec-
tories along with the optimal sequence of planetary flybys. For such purpo
se we present the optimization tool MOLTO-IT (Multi-Objective Low-Thrust O
ptimizer for Interplanetary Tra- jectories). It is based on a two-step seq
uential algorithm. In the first step\, the trajectory is assumed to be a G
eneralized Logarithmic Spiral. A heuristic global search algorithm combine
d with nonlinear programming are in charge of optimizing the set of parame
ters defining the spirals\, as well as the number\, sequence and configura
tion of the gravity assists. As a result the set of Quasi-Pareto-Optimal s
olutions trading off propellant mass consumed and time of flight are obati
ned. In the second step\, candidate solutions are regarded as initial gues
ses for a direct collocation method\, where the problem is transcribed int
o a Nonlinear Programming Problem by discretization\, considering the full
dynamics and the complete set of constraints.\nA full overview of the cap
abilities and features of MOLTO-IT will be given. In particular\, the abil
ity to obtain optimal flyby sequences without a-priory knowledge by the us
er. Addi- tionally\, the effectiveness of our methodology to generate not
only rapid performance estimates for preliminary trade studies\, but also
accurate calculations for the detailed design\, will be highlighted.\n\nht
tps://indico.esa.int/event/224/contributions/3860/
LOCATION: 103 and 105 combined
URL:https://indico.esa.int/event/224/contributions/3860/
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