Tires on the ground ...

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17 years 8 months ago #18705 by Larry Burford
The move from virtual prototypes to real prototypes is an important milestone in any project.

Building and operating (read: playing with) a real machine will tell us much about the kind of questions we need to be asking when it comes to reliability. This is definitely a sexy looking machine. I suspect, however, that it has more failure modes than the ball design. (I keep visualizing pilots with 10 or 20 minute long feedback loops driving these things off of cliffs. Especially when we stage a race to the top of the real Olympus Mons, on Mars.)

I look forward to your next report ...

LB

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17 years 8 months ago #18708 by MarkVitrone
Replied by MarkVitrone on topic Reply from Mark Vitrone
Larry,
The first wave of rovers can be rented and driven along a user-chosen pathway with some independant avoidance protocols in place. Intentional destruction, too-steep grades, terrible terrain, and plunging into crevasses will all be programmed against. With the walk-thru maps discussed earlier, the client can check out overhead imagery and decide where they would like to travel. They could map what they think would be the fastest route up Olympus Mons. Before we worry about racing these things and having real-time feedback (I think the clients will be sufficiently impressed to tell their friends that they own time on a real Mars rover, regardless of the limitation, and there must be some limitation because recharging and weather details will not be negotiable); I think we must build something and test its limitations. I am in favor of the design I posted yesterday because it is possible to situate solar cells, it has battery room, has a high vantage point for the mounted optics, and it condenses into a ball for packaging. I am not trying to pat myself on the back, but the design feels workable without too many technological limitations. Of course, I will reread this in a year and slap myself for the jinx.

Mark Vitrone

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17 years 7 months ago #18783 by MarkVitrone
Replied by MarkVitrone on topic Reply from Mark Vitrone
Fellas,

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17 years 7 months ago #18791 by shando
Replied by shando on topic Reply from Jim Shand
Stoat: Do you think that a gyro can steady the camera enough (and stay within weight/cost budgets)? There is going to be a lot of pendulum-like swinging forward and backward of the under-slung instrument package as the wheels encounter small obstacles (like gravel) and up/down grades.

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17 years 7 months ago #18792 by Larry Burford
<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by MarkVitrone</i>
<br />Fellas,

Has this thread died?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

I doubt it. But I've been thinking about where this goes from here. And I'm still thinking.

It would be cool if some of the audience members let us know what they think about this - offbeat? - idea.

LB

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17 years 7 months ago #18793 by Stoat
Replied by Stoat on topic Reply from Robert Turner
Hi Shando, a peizoelectric gyro doesn't weigh much and I think we need one on the rover for navigation anyway. I also think we should give the "head" a nose [8D] The human eye/brain always sees our nose, it does some clever integrations and uses that info to move the eye muscles. Perhaps we can suggest this to a mobile phone company, get the research done, a mini steady cam for mobiles would be quite good.

I think the design also has a pendulum bob built into it. The drive motors give us pendulum data, if we move the rover then stop it.

I've got the basic model built in 3d, just need to give it some materials and put it up.

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