Solutions for GTOC-7

[KeGu Thueringer]

Hello,

during the GTOC-7 competition itself the Jena group found a
solution with 24 points. In the meantime, we were able to
construct a solution with 29 points (using three PC's, the fastest
one  being an i7-4930 with 6 cores). Dr. Dietmar Wolz, active
member of the group, was so kind to make a Youtube video
showing this 29-solution.

https://www.youtube.com/watch?v=kPz-mNkAXek

Cheers, Ingo Althöfer.

[Dario Izzo]

Cool, great!!

I was planning to post some media material on the portal as soon as the official rankings are out. If anyone else has nice material, let me have it and I will also post it on the portal.

Dario

[Ossama Abdelkhalik]

My team has created media for our solution of 20 asteroids. The video is posted on youtube here:

https://www.youtube.com/watch?v=ISy0SiWm56Y

Thanks,

Ossama

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Ossama Abdelkhalik, PhD
Assistant Professor
Department of Mechanical Engineering-Engineering Mechanics
Michigan Technological University
815 R.L. Smith Building
1400 Townsend Drive
Houghton, MI 49931-1295
Phone: (906) 487-3503
Fax:(906) 487-2822
http://www.me.mtu.edu/meem/facultybio/O_Abdelkhalik.html

http://me.sites.mtu.edu/abdelkhalik/

[Ingo Althoefer]

Hello Ossama,

thanks for the posting.

We had found your nice Youtube video a few days ago, and that was the
starting point for us to make "our own" video. (The tension is high;
we are waiting for the results of GTOC-7 ...) Of course, we will not
win this time, but we are eager to learn what and how others did it.

Do you intend to go to the GTOC-7 workshop in Rome?

Best regards, Ingo.



Zitat von Ossama Abdelkhalik <ooab...@mtu.edu>:

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[docdwo]

After comparing different videos created from our solutions we had the idea, 

that it could be interesting to include solutions from other teams. 

Since after finding out how to do it, it takes only about 10-20 minutes work per video. 

So we offer to create videos for other solutions/teams who fear it is too much effort.

Since only lambert transfers are used as input for video creation

(for low thrust it is hard to see a difference compared to continous thrust)

we need only a simple text file as input, listing each trajectory leg as follows in

any order:

ShipId StartTimeMJD TargetTimeMJD StartAsteroidNumber TargetAsteroidNumber

ShipId = 0 for the mothership and ShipId = 1,2,3 for the probes 

Please use spaces as separators and take the asteroid number from the Num entry

from GTOC7ASTEROIDS.TXT. MJD dates should be formatted as in the P1example.txt file

(like 5.90298259420386E+04). 

The Method works best if the mothership operates only at asteroids. Otherwise you could

send me an extended GTOC7ASTEROIDS.TXT file containing mothership orbits as additional

"artificial" Asteroids referred in your input file. 

If you send me a file in the given format (drdiet...@googlemail.com), you will recieve a mp4-file (about 4MB).

I will be on vacation start of August - so please don't expect a fast reply at that time.

[docdwo]

Some details to the shown mission. As you can see, fuel consumption would allow

for 10-leg probe trajectories - which means 32 points, but we couldn't achieve this

in 6 years - 60 days. In order to score for the first and the last asteroid it is

not possible to use the full 6 years as flight time. Only probe 3 could use 

6 years - 30 days since probe 2 already scored for "1998 FM15".

We eagerly await the method descriptions of the teams with much better solutions.

There must be a way to find "shorter" trajectories we overlooked.

Mission time = 11.200977960676925 years

Vinf = 6.000 m/s

Primary score = 29

Secondary score = 2681.243037960645

Mothership;

Start from Earth at 61315.2

1: to Solon massS = 24000.0 massE = 16655.82 timeS = 61315.2 timeE = 61776.8 timeD = -461.6

2: to Kuniko massS = 16655.82 massE = 15412.17 timeS = 62023.19 timeE = 62568.19 timeD = 246.4

3: to Sawa massS = 15412.17 massE = 13325.97 timeS = 62786.11 timeE = 63141.11 timeD = 217.92

4: to Magnitskij massS = 13325.97 massE = 11931.72 timeS = 63392.64 timeE = 63727.64 timeD = 251.52

5: to 1998 FM15 massS = 11931.72 massE = 10357.71 timeS = 64349.19 timeE = 64654.18 timeD = 621.55

Probe 1:

- Is released from the mothership at MJD 61757.07538461362 at asteroid Solon.

- Starts from asteroid Solon at MJD 61787.07538461362.

- Arrives at asteroid Magnitskij at MJD 63891.32653803986.

- Picked up by the mothership at asteroid Magnitskij at MJD 63921.32653803986.

- Final mass for probe 1 is 917.6969221445031 kg .

- Time used between release and pick up of probe 1 is 5.925396723959583 years.

Primary performance index for probe 1 is 10

Secondary performance index for probe 1 is 917.6969221445031

Leg 1: to Minutus mass = 1780.47 arrives at = 62092.84 stays = 30.0 used time = 335.76

Leg 2: to Malmquista mass = 1613.94 arrives at = 62314.05 stays = 30.0 used time = 556.97

Leg 3: to Lonnrot mass = 1547.71 arrives at = 62456.39 stays = 30.0 used time = 699.31

Leg 4: to Utkin mass = 1398.46 arrives at = 62730.84 stays = 30.0 used time = 973.77

Leg 5: to 1997 HY9 mass = 1292.71 arrives at = 62953.96 stays = 30.0 used time = 1196.89

Leg 6: to Fatyanov mass = 1184.38 arrives at = 63202.46 stays = 30.0 used time = 1445.38

Leg 7: to Vorontsova mass = 1084.01 arrives at = 63413.89 stays = 30.0 used time = 1656.82

Leg 8: to Piotrovsky mass = 999.42 arrives at = 63624.11 stays = 30.0 used time = 1867.04

Leg 9: to Magnitskij mass = 917.7 arrives at = 63891.33 stays = 54.28 used time = 2164.25

Probe 2:

- Is released from the mothership at MJD 62640.49634457045 at asteroid Kuniko.

- Starts from asteroid Kuniko at MJD 62670.49634457045.

- Arrives at asteroid 1998 FM15 at MJD 64801.99634456963.

- Picked up by the mothership at asteroid 1998 FM15 at MJD 64831.99634456963.

- Final mass for probe 2 is 868.8191855983999 kg .

- Time used between release and pick up of probe 2 is 5.999999999997749 years.

Primary performance index for probe 2 is 10

Secondary performance index for probe 2 is 868.8191855983999

Leg 1: to Carmelmaria mass = 1863.37 arrives at = 62928.2 stays = 30.0 used time = 287.71

Leg 2: to 1999 XU18 mass = 1697.3 arrives at = 63180.79 stays = 30.0 used time = 540.3

Leg 3: to 1994 UC1 mass = 1539.98 arrives at = 63405.6 stays = 30.0 used time = 765.1

Leg 4: to Oneill mass = 1398.24 arrives at = 63640.99 stays = 30.0 used time = 1000.49

Leg 5: to 1998 HX mass = 1280.48 arrives at = 63813.72 stays = 30.0 used time = 1173.22

Leg 6: to 1995 BS3 mass = 1174.1 arrives at = 63994.21 stays = 30.0 used time = 1353.71

Leg 7: to Podobed mass = 1066.2 arrives at = 64250.61 stays = 30.0 used time = 1610.11

Leg 8: to Stroganov mass = 943.78 arrives at = 64529.49 stays = 30.0 used time = 1889.0

Leg 9: to 1998 FM15 mass = 868.82 arrives at = 64802.0 stays = 30.0 used time = 2191.5

Probe 3:

- Is released from the mothership at MJD 63216.1236670731 at asteroid Sawa.

- Starts from asteroid Sawa at MJD 63246.1236670731.

- Arrives at asteroid 1998 FM15 at MJD 65407.62366706949.

- Picked up by the mothership at asteroid 1998 FM15 at MJD 65407.62366706949.

- Final mass for probe 3 is 894.7269302177422 kg .

- Time used between release and pick up of probe 3 is 5.999999999990119 years.

Primary performance index for probe 3 is 9

Secondary performance index for probe 3 is 894.7269302177422

Leg 1: to Schutz mass = 1791.22 arrives at = 63485.29 stays = 30.0 used time = 269.17

Leg 2: to Crabbegat mass = 1665.21 arrives at = 63707.77 stays = 30.0 used time = 491.65

Leg 3: to Ossietzky mass = 1517.23 arrives at = 63924.0 stays = 30.0 used time = 707.88

Leg 4: to 1997 VD3 mass = 1392.48 arrives at = 64171.26 stays = 30.0 used time = 955.13

Leg 5: to 1999 JT27 mass = 1284.77 arrives at = 64411.12 stays = 30.0 used time = 1195.0

Leg 6: to Alexandrinus mass = 1169.37 arrives at = 64653.79 stays = 30.0 used time = 1437.67

Leg 7: to 1981 EL21 mass = 1096.23 arrives at = 64911.35 stays = 30.0 used time = 1695.23

Leg 8: to 1999 RO194 mass = 946.12 arrives at = 65193.16 stays = 30.0 used time = 1977.03

Leg 9: to 1998 FM15 mass = 894.73 arrives at = 65407.62 stays = 30.0 used time = 2191.5