Getting Unstuck in West Valley |
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Getting Unstuck in West Valley |
 Jul 6 2009, 08:32 PM
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#616
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 Member  Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721  |
QUOTE (RoverDriver @ Jul 6 2009, 01:55 PM)  Also, you are suggesting to do it on the tractionless wheels, not on the RF, but since none of the other wheels have much traction, which wheel would do the driving?  Obviously the one that's had a chance to rest for 1200 sols and is now ready to start working again. 
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Jul 6 2009, 09:19 PM
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#617
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Member Group: Members Posts: 251 Joined: 22-September 08 From: Spain Member No.: 4350 |
07.01 navcams enhanced.
-------------------- "I can easily see still in my mind’s-eye the beautiful clusters of these berries as they appeared to me..., when I came upon an undiscovered bed of them... – the rich clusters drooping in the shade there and bluing all the ground" -- Thoreau
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Jul 6 2009, 09:28 PM
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#618
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 Member Group: Members Posts: 577 Joined: 5-November 04 From: Denmark Member No.: 107 |
Paolo
How far down the list is a retest of the RF wheel right now?  You mentioned it some time ago, but there was some risk associated with it...
-------------------- "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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Jul 6 2009, 11:15 PM
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#619
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 Senior Member Group: Admin Posts: 4496 Joined: 15-March 05 From: Sloughhouse, CA Member No.: 197 |
QUOTE (Fran Ontanaya @ Jul 6 2009, 01:19 PM) 07.01 navcams enhanced. Now that's what we refer to as a CLEANING EVENT! -------------------- If Occam had heard my theory, things would be very different now.
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Jul 6 2009, 11:36 PM
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#620
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 Senior Member Group: Moderator Posts: 6474 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Whoa!!!! Wonder if any before & after power data was recorded.
-------------------- 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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Jul 7 2009, 03:55 AM
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#621
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Member Group: Members Posts: 530 Joined: 21-March 06 From: Canada Member No.: 721 |
Forget power levels, check and see if there's a yellow brick road nearby. That was a direct hit. Wow, what luck! You couldn't get a better photo sequence if you were... um,... shooting this on a soundstage...
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Jul 7 2009, 04:59 AM
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#622
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 Member Group: Members Posts: 237 Joined: 18-December 07 From: New York Member No.: 3982 |
What sol was that? (The wind gust.)
Edit: Never mind. You must have done one heck of an enhancement because I can’t see much of anything in the originals. http://qt.exploratorium.edu/mars/spirit/navcam/2009-07-01/ |
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Jul 7 2009, 05:13 AM
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#623
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Member Group: Members Posts: 237 Joined: 18-December 07 From: New York Member No.: 3982 |
Not surprising that the latest status report goes up to sol 1952 and the straight-line wind event was on sol 1953.
 Luckily the next update should be tomorrow. |
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Jul 7 2009, 05:21 AM
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#624
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 Member Group: Members Posts: 760 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
QUOTE (dot.dk @ Jul 6 2009, 02:28 PM) Paolo How far down the list is a retest of the RF wheel right now? You mentioned it some time ago, but there was some risk associated with it...So far down that I can't see it. Probably right around using the IDD to shovel rocks under the LF wheel. This was not asked too many times, and is not in the FAQ, might be a good addition, if the admins want to pick this up: In order to save mass and reduce complexity, some of the actuators (~=motors) share motor controllers (electronics), for example IDD and mobility. This means that if an attempt at applying voltage to the RF wheel results in damage the motor controller we potentially lose the use of another actuator. In addition, given the fact we are not 100% sure about the type of fault we have on the RF actuator, sending power down a line that might be shorted some unknown place might ultimately send power to a device that might get damaged. When I talked to Jake Matijevic some time back he did not like the idea at all. I still think we might be able to send a voltage that is low enough not to cause damage but high enough to verify whether the motor is OK or not. I will try to talk to him again about this. 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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Jul 7 2009, 05:39 AM
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#625
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Member Group: Members Posts: 577 Joined: 5-November 04 From: Denmark Member No.: 107 |
Thanks for that
I figure you actually did this (sending power down the line) right after the wheel stalled to conclude it was dead? So the "risk" is that it in the meantime it has developed a short that could damage some other hardware if it is powered on as you said? Do you know what other actuators are controlled by the RF wheels motor controller? -------------------- "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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Jul 7 2009, 06:22 AM
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#626
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Member Group: Members Posts: 760 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Yes we did send power down the line to determine the mode of failure but don't recall what we measured (short or open circuit). The rationale is that if we want to test the actuator we believe something might have changed and if so, we might be dealing with a loose wire.
No, I do not recall what actuator is shared with the RF. I would need to look it up. I will let you know. [edit] The RF drive actuator shares the motor controller with one of the IDD joints and the failure was an open circuit indicating that at some point along the wire there is a break in the cable or interconnects. [/edit] 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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Jul 7 2009, 10:06 AM
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#627
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 Senior Member Group: Admin Posts: 2418 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
RoverDriver said: ...FAQ, might be a good addition, if the admins want to pick this up
Done! There was a reference about trying the RF wheel already, but thanks for the extended answer which has been added to the FAQ. I'll try to keep it uptodate as Q&A come along.
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Jul 7 2009, 02:06 PM
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#628
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Member Group: Members Posts: 231 Joined: 19-August 07 Member No.: 3299 |
Is the electric motor of rover wheel attached inside of the wheel? There are many causes that the electric motor get stuck. Most of the cases might be due to dirty contact brush. As I remember that RF wheel stopped to work after going a very dusty surface. The ideal is that "someone" there is able to kick or try to rotate manually it in order to get rid any dirty dust of wheel. Spirit as alone there, the only way is to kick its wheel against any rock when she is back on business.
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Jul 7 2009, 03:18 PM
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#629
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 Senior Member Group: Members Posts: 2561 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
QUOTE (ElkGroveDan @ Jul 7 2009, 01:15 AM) Now that's what we refer to as a CLEANING EVENT! I'd even said CLEARING EVENT! |
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Jul 7 2009, 08:46 PM
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#630
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Member Group: Members Posts: 173 Joined: 9-September 08 Member No.: 4334 |
QUOTE (RoverDriver @ Jul 6 2009, 08:55 PM) Not to pick on you, but do you seriously believe that if we could actually do it we would not have done it already? I figured it had probably been thought of, but I didn't see it mentioned in the freeing Spirit FAQ. Sorry. |
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