Getting Unstuck in West Valley |
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Getting Unstuck in West Valley |
 May 15 2009, 10:19 AM
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#121
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Junior Member  Group: Members Posts: 33 Joined: 13-April 05 Member No.: 232  |
The Calypso pan... with reference to, I'm guessing, the Odyssey?
Odysseus (of Ithaca!) spends ten years on a Mediterranean island, 'sorrowing bitterly in the house of the nymph Calypso, who is keeping him prisoner, and he cannot reach his home for he has no ships nor sailors to take him over the sea.' He gets out, but it takes a while. http://www.gutenberg.org/dirs/etext99/dyssy10.txt |
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| Guest_PhilCo126_* |
 May 15 2009, 01:37 PM
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#122
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Guests |
I guess the last time Spirit got stuck ( Jammerbugt between sols 833 - 843 ) it sat deeper in the sand. However, let's not forget it took almost 5 weeks to get Oppy out of Purgatory Dune ( sols 446 - 484 )
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May 15 2009, 02:12 PM
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#123
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 Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Opportunity was the one that got stuck in Jammerbugt.
Actually, not even stuck. By that time they had a technique to get out from the experience learned at Purgatory. Past events demonstrate that the Rover drivers know what their vehicles are capable of. 
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May 15 2009, 03:37 PM
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#124
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 Special Cookie Group: Members Posts: 2168 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 |
QUOTE (Astrophil @ May 15 2009, 11:19 AM)  Odysseus (of Ithaca!) Did I hear someone calling?  So...what's the deal? Where do you guys want me to focus my kinetic powers?...  -------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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May 15 2009, 03:54 PM
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#125
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Member Group: Members Posts: 279 Joined: 19-August 07 Member No.: 3299 |
QUOTE (Astro0 @ May 15 2009, 08:12 AM) Actually, not even stuck. By that time they had a technique to get out from the experience learned at Purgatory. Past events demonstrate that the Rover drivers know what their vehicles are capable of. The Spirit case is even more complicated than her sister due to its inoperative right front. This causes twice obstacles: 1) No traction on both sides and 2) Yes drag in two ways but going forward causes less drag than going backward only if the RF is not able to lift a little from surface. All at all, after long time of long dragging and if Spirit manages to reach on the other side of firmer soil, she will be back on the business. |
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May 15 2009, 06:10 PM
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#126
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Newbie Group: Members Posts: 13 Joined: 2-May 09 Member No.: 4758 |
Here a Panorma from Spirit on Sol 1904:
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May 15 2009, 08:59 PM
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#127
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Junior Member Group: Members Posts: 27 Joined: 22-September 08 Member No.: 4349 |
This is probably overly simplistic, but how about turning the wheels VERY slowly for extend periods? It has worked for me after getting my 65 Ford Galaxy 500 stuck (without a shovel) in deep snow, and in sand.
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May 15 2009, 09:03 PM
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#128
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 Member Group: Members Posts: 578 Joined: 5-November 04 From: Denmark Member No.: 107 |
They already do that
-------------------- "I want to make as many people as possible feel like they are part of this adventure. We are going to give everybody a sense of what exploring the surface of another world is really like"
- Steven Squyres |
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May 15 2009, 09:40 PM
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#129
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 Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Good time for a related amplifying base question: Are the MERs wheels constrained to drive at a constant speed? I assume that the answer is yes.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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May 15 2009, 11:49 PM
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#130
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 Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (nprev @ May 15 2009, 02:40 PM) Good time for a related amplifying base question: Are the MERs wheels constrained to drive at a constant speed? I assume that the answer is yes. During each command yes, they ramp up quickly to the steady speed that is required for the motion and just prior to the end they ramp down. Just like any servo motor. But during an arc, say to the left, the left side wheels move slower than the right side, simulating a mechanical differential if you want. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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May 16 2009, 12:10 AM
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#131
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Really? That's interesting. I was thinking that they were open-loop constant speed motors for sake of design simplicity, not servos.
So, Beauford's idea is possible, then? You can control wheel rotation speed with precision? -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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May 16 2009, 08:25 PM
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#132
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 Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Some wheel movement thisol?
Comparing the image with those from sol 1899 it appears the rear bogie has move up slightly. sol 1899: http://207.7.139.5/mars/spirit/rear_hazcam...DNP1354L0M1.JPG sol 1908: http://207.7.139.5/mars/spirit/rear_hazcam...DOP1314L0M1.JPG Reversing the rear wheels in an attempt to put more weight on the middle wheels? |
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May 16 2009, 08:32 PM
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#133
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Newbie Group: Members Posts: 13 Joined: 6-April 09 Member No.: 4720 |
Does the consistency of the soil change any with temperature? Any chance things would be different in the winter now that we have nice sparkly solar panels?
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May 16 2009, 08:35 PM
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#134
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
Simple test for the ISIL once there's a suitable buried testbed rover.... a pull test with a force meter to establish if the sort of force required to shift our stubborn girl is anywhere near the IDD's abilities.
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May 16 2009, 08:47 PM
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#135
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
QUOTE (alan @ May 16 2009, 10:25 PM) Some wheel movement thisol? Something was commanded (site/drive numbers have changed) but I can't see any movement. |
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