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Opportunity General Health
vjkane
post Apr 28 2018, 07:52 PM
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QUOTE (RoverDriver @ Apr 27 2018, 10:46 PM) *
There are two things I would redesign:

Maybe ultraflex solar panels for more power

This thread isn't totally idle speculation. The Mars community is considering a line of future MER-size rovers to explore the diversity of surface types with past histories of water. With modern instruments, it could be really nice upgrade.

I suspect that a precision landing system would also be high on the list for a future rover line.

Would be nice to have a single general purpose heat source RTG (MMRTG's have 8) to supplement the solar array for survival heating and power during dust storms. Of course, the mission cost just sky rocketed due to the certifications.


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fredk
post Apr 29 2018, 02:05 PM
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QUOTE (marsophile @ Apr 28 2018, 06:39 AM) *
In this well-lit image, it appears to be an original equipment plastic cover that is fraying and coming loose.

Not surprizingly sharp-eyed members here spotted this years ago - check out the animation here.
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James Sorenson
post Apr 29 2018, 05:50 PM
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QUOTE (vjkane @ Apr 28 2018, 12:52 PM) *
Maybe ultraflex solar panels for more power.

More power maybe, but what about deployed rigidity? A rover going over rocks and pot holes in the road no doubt will put alot of vibrational stress on the bonded cells and structure. Was there ever testing done on this for the MAX-C concept?
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mcaplinger
post Apr 29 2018, 08:30 PM
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QUOTE (James Sorenson @ Apr 29 2018, 09:50 AM) *
Was there ever testing done on this for the MAX-C concept?

As far as I know MAX-C was a series of viewgraphs "designed" by scientists and systems people. Engineers generally come in and make things work only after the mission is selected.

Let's put this speculative discussion somewhere else as it's off-topic for MER. The rover after M2020 will likely resemble MER only in that it will have wheels and drive around. smile.gif


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Disclaimer: This post is based on public information only. Any opinions are my own.
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mcaplinger
post Apr 29 2018, 08:35 PM
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QUOTE (peter.neaum @ Apr 27 2018, 01:59 PM) *
My thought was 'what wear is there in a brushless motor?'

The bearings and gear teeth still see wear in a brushless motor.

Predicting the lifetime of any mechanical system, or any system at all for that matter, is a bit of a black art.


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hendric
post May 4 2018, 08:57 PM
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Looks like some research is being done for low-temp batteries. https://www.nature.com/articles/d41586-018-02631-9


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Explorer1
post May 6 2018, 04:04 PM
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The meantime... the newest A.J.S. Rayl update shows that apparently the power situation is so good, the team is attempting to use the excess(!) for more astronomical observations:
http://www.planetary.org/explore/space-top...-extension.html

I am wondering what the issue is with the batteries remaining fully charged; I've heard about this before, but does anyone have more details? Not just asking because I'm a laptop user who wants to preserve my own as much as possible...
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mcaplinger
post May 6 2018, 04:44 PM
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QUOTE (Explorer1 @ May 6 2018, 08:04 AM) *
I am wondering what the issue is with the batteries remaining fully charged; I've heard about this before, but does anyone have more details?

http://batteryuniversity.com/learn/article...based_batteries

Your battery would last longest if you constantly maintained it at somewhere between 50% and 75% of capacity. Of course you want to discharge it sometimes since otherwise there's not much point in having a battery.


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