ROVER WHEELS: Monitoring changes over time, NOTE: Read back through the thread to avoid repeating misconceptions |
ROVER WHEELS: Monitoring changes over time, NOTE: Read back through the thread to avoid repeating misconceptions |
May 16 2013, 08:35 AM
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Junior Member Group: Members Posts: 22 Joined: 10-August 12 From: Australia Member No.: 6530 |
[MOD NOTE: This thread follows on a post by Ed Truthan containing a MAHLI mosaic of MSL wheels taken on sol 275.]
Ed: zooming in on that marvellous underbelly MAHLI montage, there appears to be further (and previously noted) deformation of the wheel surfaces. Damage is most evident in the view of the front-left wheel inner surface. Such wear has previously been discussed and concerns allayed. Nevertheless, the front left wheel surface *appears* to have been punctured. We've only done 700 meters, and have 7000 more to get to Mt Sharp..... Given that more odometry has now accumulated, is any (re-)new(ed) concern valid? DeanM |
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Dec 9 2013, 02:08 AM
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Senior Member Group: Members Posts: 1057 Joined: 17-February 09 Member No.: 4605 |
Well you are certainly thinking well outside the box there Gerald and full marks for that although I honestly cannot see any real utility in your suggestion. I guess that the hardness of the anodized layer will have been assessed although you would be pretty safe thinking it to be 7 < <9 (MOHS). Basalt has a MOHS of around 7 but the punctures in the wheel would be caused by small cross sectional contact where the effect on the basalt would be compression. There is no real time visual monitoring so no information available on when or where an incident (scratch, rear, puncture or crazing) occurred, or the dynamics. The anodized coating will have a different coefficient of thermal expansion than the underlying aluminium so there could be a degree of crazing caused by the Martian temperature variations which at the image resolution available would muddy the waters.
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Dec 9 2013, 11:00 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
... I honestly cannot see any real utility in your suggestion ... Let me just pick out one simple hypothetical(?) example, because elaborating everything is beyond my possibilities: Imagine a green streak on a wheel. My first association would be malachite, although unlikely on Mars. The wheels can look beneath the dust all along the drive, whereas the cameras can't. If a dent is associated with the streak this may give an estimate of the shape of the peak which caused the streak, useful when driving back for detailed investigation. Here some surface parameters (to be applied to macroscopic features), which could be checked for their effect on the wheels, and possibly back-projected from wheel damage. Just to inspire people to make more of it. I'll (by default) return to monitoring/image processing. |
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