Subject:
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Re: Need to compare
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 28 Sep 2002 20:58:01 GMT
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Original-From:
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Vincent Raman <{Vincent.Raman@ulb}stopspam{.ac.be}>
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Viewed:
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827 times
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Ok, so, the complete description....
It's not really a competition, but a project for students in my
university...
We have to build a bot with LEGO mindstorms... This bot has to be able to
follow a line on a ground made in steel.
This line goes through a step, a "draught-board" made with divisions of
different heights, a hole and a bent...
The constraints stay the same but they will increase until no vehicle can
pass.
The maximum dimensions are : 30cm height, 60 cm lenght, 30cm width...
The university give us 60 euro's for that...
It's all I know!
Thanks for all your contributions!
Vincent
----- Original Message -----
From: "Steve Baker" <sjbaker1@airmail.net>
To: "Vincent Raman" <Vincent.Raman@ulb.ac.be>
Cc: "Mailing list robotique" <lego-robotics@crynwr.com>
Sent: Saturday, September 28, 2002 10:32 PM
Subject: Re: Need to compare
> Vincent Raman wrote:
>
> > Yes, it's the maximum dimensions...
>
> Oh - that's a pain.
>
> > We have already seen the shrimp and we think to build something like • that
> > (maybe also with tri-star wheels)... But if somebody find a better • solution,
> > because we don't know the comportement of the shrimp with a little hole • on
> > the ground. A whole just large enouh to "keep" a wheel...
>
> Well, I guess it depends on how rough the terrain in general is. If it's
> a flat, smooth surface with just one 5cm hole - then practically any • vehicle
> with (say) 6 wheels will drive across it like it wasn't there.
>
> However, if the ground is just that rough in general then a more robust
> design may be called for...a six legged walker would be best.
>
> Is there a formal competition arena that's accurately defined - or is
> this just a generally rough area that you don't know a lot about?
>
> > But the trouble is that we can exclude all other possibilty without
> > arguments! Just saying "That's we need" is not enough...
> >
> > Why exclude caterpillars, legs?
>
> I certainly wouldn't exclude legs - they are a really good idea for
> extremely rough and unpredictable terrain - you can make them adapt
> to the shape of the ground - something that a fixed-geometry vehicle
> can't do.
>
> If you could get enough Lego tracks, you could possibly do well with
> a LARGE tracked vehicle too...something like this:
>
> http://m2reviews.cnsi.net/reviews/misc/swiftmale.htm
>
> ...but you'd need it to be the maximum size your competition allows - and
> there are no Lego tracks that big - so I would consider building a vehicle
> like the underside of that using lots of separate track segments.
>
> /o ^
> /o/ |
> /o/ 30cm
> _____ _____ _____ /o/ |
> (o_o_o)(o_o_o)(o_o_o) v
>
> ...if you built that to the maximum size the competition allows then it
> should be able to climb a 30cm step and cross holes up to maybe 30cm.
> With a low enough center of gravity, it could probably do a good job
> over almost any terrain.
>
> ...but it would need to be big in order to climb large steps. Something
> made with just one set of tracks and an RCX stuck in between will be • hard-pressed
> to climb even a 2cm step.
>
> > For the step, it begins at 1cm and it will be increased until no • véhicule is
> > able to climb this step...
>
> OK - so this isn't a 'stair climbing' problem.
>
> Can you show us the *entire* description of the problem? It's hard to • visualise
> with just pieces of description.
>
> ----------------------------- Steve Baker -------------------------------
> Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com>
> URLs : http://www.sjbaker.org
> http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
> http://prettypoly.sf.net http://freeglut.sf.net
> http://toobular.sf.net http://lodestone.sf.net
>
>
>
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Message is in Reply To:
 | | Re: Need to compare
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| (...) Oh - that's a pain. (...) Well, I guess it depends on how rough the terrain in general is. If it's a flat, smooth surface with just one 5cm hole - then practically any vehicle with (say) 6 wheels will drive across it like it wasn't there. (...) (22 years ago, 28-Sep-02, to lugnet.robotics)
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