GTOC6 Problem Announcement

[Anastassios E. Petropoulos]

Dear GTOC6 registered teams and interested parties,

It is with great pleasure that we announce the GTOC6 problem and
commence the competition.

Attached are the problem description (PDF format), templates for the
three solution files, and a list of the 33 registered teams. (The
latter files are all plain text files.)

We hope that the competition will stimulate your creativity and pique
your interest. Registered teams, let me know at some point if you
plan on submitting a solution, so I can know to expect it.

As noted before, and in the problem description, solutions are due on
Monday 08 October 2012, at 20:00 GMT.

Please don't hesitate to ask if clarifications are needed.

With best wishes,

-anastassios petropoulos

[Anastassios E. Petropoulos]

Dear all,

Thanks to a pair of sharp eyes amongst you,
the Units for semimajor axis in Table 4
should be km, not AU.

A corrected problem description document
is attached. Sorry for any confusion!

This and any future updates/clarifications
will be posted as conspicuously as possible
at the GTOC google group page:

https://groups.google.com/forum/?fromgroups=#!forum/gtoc_competition

(You needn't be a member of the group or
of Google to view the site.)

Best wishes,

-anastassios

[jxy]

Dear Prof. Petropoulos

Thank you for your emails.

Best regards.

[Jhonny Pérez-Alviarez]

Dear Prof. Petropoulos.

Thanks for announcement.

--

[Anastassios E. Petropoulos]

Dear all,

An important addition, clarification and some minor points:

1. There is an intended constraint on the flyby v_infinity magnitude,
which was inadvertently omitted from the problem description.
Please use the following constraint:

v_infinity >= 300 m/s

2. The units of m_pen(k+1) are kg (the numeric value produced by the
formula is in kg).

3. In computing the mass penalty, take r_{ai}<0 for parabolic orbits
(so parabolic orbits do not contribute to the mass penalty).

4. The formula for the r_{pS} vector was not properly normalised on
page 6: In the denominator, replace v_infinity with
| vinf_{G-} - vinf_{G+} |
i.e. with the magnitude of the vector difference of the incoming
and outgoing v-infinities.

A last point, the GTOC google group link I provided was garbled in
the last email transmission. To avoid repeat garbling, I send it
again split into two lines (join them together to get the link)

https://groups.google.com/
forum/?fromgroups#!forum/gtoc_competition

My apologies for not making these points earlier, I trust it will
not be too much of an inconvenience.

Thank you all and best wishes,

-anastassios

> > gtoc6_problem_stmt
> > .pdf
> > >
> > <
> > gtoc6_traj_format
> > .txt
> > >
> > <
> > gtoc6_flyby_format
> > .txt><gtoc6_perijove_format.txt><gtoc6_team_list.txt>
>
> <gtoc6_problem_stmt.pdf>

[lorenzo casalino]

Dear all,

The team Politecnico di Torino - Università di Roma "Sapienza" is honored
to announce the 7th edition of the Global Trajectory Optimisation
Competitions. GTOC7. Instructions for registering for the competition are
outlined below.
The competition was instituted and organised in 2005 under the leadership of
Dario Izzo of the Advanced Concepts Team, European Space Agency, as a means
of stimulating research in the area of spacecraft trajectory optimisation
and was won by the Outer Planets Mission Analysis Group of the Jet
Propulsion Laboratory. Traditionally, the winner of the previous edition has
organized the new one, and, as winners of GTOC6, we were asked to accept the
honour of organising the competition this year.
Today, local optimisation methods, while unlikely to provide a global
optimum, are widely used in trajectory optimisation. In looking for the best
possible trajectory, mission designers typically perform individual local
optimisations, guided by experience, until they find a solution with which
they are satisfied. Global optimisation techniques can offer significant
assistance in finding an acceptable solution to a given problem, even though
convergence to the global optimum is not yet guaranteed. By focusing on a
problem with a very large number of locally optimal solutions, the Global
Trajectory Optimisation Competition promotes development of methods that
most thoroughly and most quickly search a large and unconventional design
space for optima. The competition offers a unique playground for researchers
to test new ideas, and is an excellent way to compare global optimisation
methods with classical local methods, which are permitted but, in fact,
penalized by the unusual objective function of the proposed problem.
Participation in the competition will be nominally limited to the first
fifty researchers or teams of researchers who register. To register for the
competition, send an e-mail message to lorenzo.casalino _AT_ polito.it by
May 15, 2014. Please include in the e-mail a point of contact and the names
and institutional affiliations of the researchers in the team. Feel free to
pass on this announcement to other researchers you believe may be
interested.
The competition will require to find the "best" solution to an
interplanetary spacecraft trajectory optimisation problem which will be
disclosed on May 20, 2014. Solutions must be returned within four weeks,
that is, by June 17, 2014, 18:00 GMT, in an ASCII text format which will be
specified. Solutions will be first verified and then ranked on the basis of
the objective functions which are specified for the problem.
A one-day workshop will be held on a date yet to be defined in Rome, Italy,
where selected teams will be invited to present their methods and results.
Selection of presenting teams will be based not only on the solutions but
also on other criteria such as the creativity and perceived potential of the
methods used. Details of the workshop are still to be determined.
We look forward to receiving your registration and your participation in the
competition.
Reference page www.polito.it/gtoc

lorenzo casalino

[Francesco Topputo]

Grazie Lorenzo, penso proprio he quest’anno parteciperemo.
Cordialmente, Francesco
---
Dr. Francesco Topputo
Assistant Professor, Politecnico di Milano
Dept. of Aerospace Science and Technology

Ph: +39-02-2399-8351
Fax:+39-02-2399-8334

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[lorenzo casalino]

fammi sapere, per ora siamo a 13 teams

ciao

lorenzo