Not encouraging .. There's something i don't exactly understand: is there a weight on a blocked wheel ? Could it be lifted somehow ?
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...Spirit's right-front wheel, which had stopped operating in March 2006, revolved with apparently normal motion during the first three of four driving segments on Sol 2117 (Wednesday, Dec. 16) but stopped early in the fourth segment of the drive.
...The drive conducted on Sol 2117 had been planned for one sol earlier, but was delayed after analysis of the Sol 2113 test led to discovery of a new electrical issue on Spirit.
Engineers learned that a persistent voltage now exists between the rover electric ground and the rover chassis where no voltage should exist. This condition might be related to problems with the right-rear wheel.
This is promising, right ?This suggests the unusual electrical behavior is associated with the rover motor controller board since the behavior is seen with all 10 motors associated with that electronics board. The rover has other motors not related to the wheels, but the persistent voltage has not been associated with any of those.
Even if it exerts just a little pressure that is at least something.MeteorWayne":1lkdo10k said:As has been discussed here repeatedly before, the arm is far to weak to provide any help is shifting the mass of the rover.
Still waiting to hear where she got that from, but this is a question to and response from Scott Maxwell, one of the drivers involved in Spirits efforts:MeteorWayne":3us0dknn said:Emily Lakdawalla of The Planetary Society is sadly reporting this on Sol 2135 (yesterday):
I was actually thinking the same thing. Push some rocks, small and large into the trench to offer some additional traction. What's to lose?pberrett":105up7s9 said:Maybe the arm wouldn''t have enough strength to lift the rover up.
But would it have sufficient strength to gently sweep the sand in front of the wheels away from side to side thus making a path/furrow that the wheels could travel down?
In a similar fashion maybe the arm could sweep some small rocks down under the wheels to help provide extra traction?
The arm and wheels cannot move at the same time. Also, the arm could only push in the opposite direction of the current drives. Driving in the opposite direction pushes the rover into worse surface conditions.samkent":13qsdvym said:...Why not combine the drive command with a push type command?...
That's hard to believe. Perhaps a software block as a safty feature. Change the software until Spirit gets back to hard ground. Either that or look at the same rocks until winter ends the mission.The arm and wheels cannot move at the same time.