RE: GTOC6 Problem Announcement - tie-breaker method
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Petropoulos, Anastassios E (343M)
Sep 10, 2012, 11:42:17 PM9/10/12
to Ossama Abdelkhalik, Ryan Russell, Ingo Althoefer, Dietmar Wolz, Marcus....@dlr.de, lorenzo casalino, Dario Izzo, Chit Hong Yam, Hermanni J. E. HEIMONEN, Paul Charlton, Yang Gao, hexi baoyin, Christopher L Ranieri, David Garza, Simone Sagratella, Ying Nan, Enrico Bertolazzi, peng zhang, gs...@mails.tsinghua.edu.cn, Dilmurat Azimov, Matthias Knauer, ramamurthy rallabandi, park...@colorado.edu, 张中凯 Zhang, Nguyen Viet Anh, Hao Huang, Ilya Loshchilov, Fernando Alonso, Francesco Santilli, Maxim Zapletin, 陈曦 Xi Chen, Xi Chen, feng Jiang, Min Qu, chr...@ama-inc.com, Bernard GODARD, Joris Olympio, Robert D. (GRC-DSB0) Falck, Christopher Painter-Wakefield, Jennifer Hudson, gtoc_com...@googlegroups.com
> We were wondering how ties between two or more entries having the same performance index would be
> broken?
If two or more teams have the same performance index J, the tie would be broken first by the final spacecraft mass (higher is better), and if that is also tied, then time of flight would be the second tie-breaker (lower is better).
-anastassios
> broken?
If two or more teams have the same performance index J, the tie would be broken first by the final spacecraft mass (higher is better), and if that is also tied, then time of flight would be the second tie-breaker (lower is better).
-anastassios
Anastassios E. Petropoulos
Oct 2, 2012, 4:50:18 AM10/2/12
to Ossama Abdelkhalik, Ryan Russell, Ingo Althoefer, Dietmar Wolz, Marcus....@dlr.de, lorenzo casalino, Dario Izzo, Chit Hong Yam, Hermanni J. E. HEIMONEN, Paul Charlton, Yang Gao, hexi baoyin, Christopher L Ranieri, David Garza, Simone Sagratella, Ying Nan, Enrico Bertolazzi, peng zhang, gs...@mails.tsinghua.edu.cn, Dilmurat Azimov, Matthias Knauer, ramamurthy rallabandi, Jeff Parker, 张中凯 Zhang, Nguyen Viet Anh, Hao Huang, Ilya Loshchilov, Fernando Alonso, Francesco Santilli, Maxim Zapletin, 陈曦 Xi Chen, Xi Chen, feng Jiang, Min Qu, chr...@ama-inc.com, Bernard GODARD, Joris Olympio, Robert D. (GRC-DSB0) Falck, Christopher Painter-Wakefield, Jennifer Hudson, 沈红新 Shen Hong-xin, gtoc_com...@googlegroups.com, Guido Colasurdo, francesco...@gmail.com
Dear GTOC6 teams and interested researchers,
In response to questions from several teams, please find attached
a consolidated Problem Description document, which includes:
** the changes and clarifications made public to date
** A new "examples" section in the appendix
** A "Change Log" summarising all changes since the initial
release.
The nature and parameters of the problem have not changed.
Also attached is an updated gtoc6_traj_format.tct file (the only
change is that the incidental reference frame indicated in the
comments is now corrected).
And lastly, the updated team list is attached.
I look forward to receiving your solutions in a few days!
Best regards,
-anastassios
In response to questions from several teams, please find attached
a consolidated Problem Description document, which includes:
** the changes and clarifications made public to date
** A new "examples" section in the appendix
** A "Change Log" summarising all changes since the initial
release.
The nature and parameters of the problem have not changed.
Also attached is an updated gtoc6_traj_format.tct file (the only
change is that the incidental reference frame indicated in the
comments is now corrected).
And lastly, the updated team list is attached.
I look forward to receiving your solutions in a few days!
Best regards,
-anastassios
Min Qu
Oct 5, 2012, 12:49:08 PM10/5/12
to gtoc_com...@googlegroups.com
Hi Dr. Petropoulos,
I have a question regarding the output trajectory files. Is it ok to have variable step size outputs? Our default variable step size propagator will generate reasonable sized files but it may not strictly follow your suggested "1, 0.25, 0.005" time steps. Some may go around 5 days (in the beginning) and some may go below 0.005 days. Is that acceptable? or you have to have fixed time steps?
thanks,
Min
--
Min Qu, Ph.D.
Analytical Mechanics Associates, Inc.
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I have a question regarding the output trajectory files. Is it ok to have variable step size outputs? Our default variable step size propagator will generate reasonable sized files but it may not strictly follow your suggested "1, 0.25, 0.005" time steps. Some may go around 5 days (in the beginning) and some may go below 0.005 days. Is that acceptable? or you have to have fixed time steps?
thanks,
Min
--
--
Min Qu, Ph.D.
Analytical Mechanics Associates, Inc.
*************************************
The information transmitted herewith is sensitive information intended
only for use by the individual or entity to which it is addressed. If
the reader of this message is not the intended recipient, you are
hereby notified that any review, retransmission, dissemination,
distribution, copying or other use of, or taking of any action in
reliance upon, this information is strictly prohibited. If you have
received this communication in error, please contact the sender and
delete the material from your computer.
**************************************
Anastassios E. Petropoulos
Oct 5, 2012, 1:16:09 PM10/5/12
to Min Qu, gtoc_com...@googlegroups.com, Ossama Abdelkhalik, Ryan Russell, Ingo Althoefer, Dietmar Wolz, Marcus....@dlr.de, lorenzo casalino, Dario Izzo, Chit Hong Yam, Hermanni J. E. HEIMONEN, Paul Charlton, Yang Gao, hexi baoyin, Fanghua Jiang 蒋方华, Christopher L Ranieri, David Garza, Simone Sagratella, Ying Nan, nanz...@hotmail.com, Enrico Bertolazzi, peng zhang, gs...@mails.tsinghua.edu.cn, Dilmurat Azimov, Matthias Knauer, ramamurthy rallabandi, Jeffrey S. Parker, 张中凯 Zhang, Nguyen Viet Anh, Hao Huang, Ilya Loshchilov, Fernando Alonso, Francesco Santilli, Maxim Zapletin, 陈曦 Xi Chen, Xi Chen, feng Jiang, Min Qu, chr...@ama-inc.com, Bernard GODARD, Joris Olympio, Robert D. (GRC-DSB0) Falck, Christopher Painter-Wakefield, Jennifer Hudson, 沈红新 Shen Hong-xin
Dear Min,
We can make an accommodation for variable step size, however, please
use the stated timesteps as the maximum allowable for each of the
three ranges of r. So, in the beginning (largest r range), 5 days is
too long - it must be 1 day or less.
Thank you,
-anastassios
> --
>
>
We can make an accommodation for variable step size, however, please
use the stated timesteps as the maximum allowable for each of the
three ranges of r. So, in the beginning (largest r range), 5 days is
too long - it must be 1 day or less.
Thank you,
-anastassios
>
>
Min Qu
Oct 6, 2012, 4:03:51 PM10/6/12
to gtoc_com...@googlegroups.com
Thank you very much!
Min
Min
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