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 4 2013, 01:04 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Sol 472-473 Update On Curiosity From USGS Scientist Ken Herkenhoff: Watching the Wheels:
QUOTE Such images of the wheels are now planned more frequently, to assess possible changes in the tears in the wheels. Besides monitoring, whether there ever could occur wheel damage justifying some concern: Can wheel "damage" be quantified in a way, such that the wheels can be interpreted as an additional mechanical science instrument to retrieve some statistics about an appropriate physical/geological property of the traversed surface? |
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Dec 4 2013, 02:04 PM
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
Yes it can and just such an experiement was done using the Sojourner Rover. It was called the Wheel Abrasion Experiment (WAE). Thin films of different metals were emplaced on the right centre wheel. A photovoltaic cell was used to periodically measure the reflectivity and record the level of abrasion thus characterizing the surface properties.
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Dec 4 2013, 02:46 PM
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
A small question: could the recent wheel status worsening be related to the long, high average speed drive on Sol 472?
-------------------- I always think before posting! - Marco -
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Dec 4 2013, 03:41 PM
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
A small question: could the recent wheel status worsening be related to the long, high average speed drive on Sol 472? There's no such thing as a 'high speed drive'. When in motion the rover is typically at the same speed. 3cm/sec. What you're perceiving as 'high speed' is a blind-drive ( no stops ) compared to autonav ( many freqent stops ) The speed of the rover when in motion is the same regardless. Go look at some speed plots at http://curiositylog.com/ to see the typical speed over time of the rover. |
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Dec 4 2013, 08:43 PM
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#6
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
The speed of the rover when in motion is the same regardless. Go look at some speed plots at http://curiositylog.com/ to see the typical speed over time of the rover. Thanks Phil/Doug, I already linked Joe's speed plot in my previous post, however I had the (probably wrong) impression that constant "high" speed with no stops can cause more damages! -------------------- I always think before posting! - Marco -
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Dec 4 2013, 08:58 PM
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#7
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
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