Subject:
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Re: vision command idea...
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 14 Dec 2000 13:33:05 GMT
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Original-From:
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bill.wittig@delphiauto.com&saynotospam&
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Viewed:
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596 times
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You might want to look for information on "QuadraSteer". That's a Delphi Saginaw
product (my company) that will be coming out on full size trucks in the near
future. It adds rear wheel steering to the truck. The wheels are in phase (both
turn the same way) at high speed and out of phase at low speeds. It gives the
truck the same turning radius as a small car, and, at highway speeds, it makes
pulling a trailer a much more stable proposition.
I'm sure the ideas could be adapted to Lego...
bill wittig
Jennifer Clark <jen@vulture.dmem.strath.ac.uk> on 12/13/2000 06:24:50 AM
To: lego-robotics@crynwr.com
cc: (bcc: Bill Wittig)
Subject: Re: vision command idea...
Mike Fusion wrote:
> after doing some searching i found out that it is called "Central Steering"
It does, however, get more complicated that than - see a recent thread on
lugnet.technic discussing this:
http://news.lugnet.com/technic/?n=3102
I would have flagged it up to you before, but the thread did not deal with the
issue of powering the axles, only steering. Essentially, once you have multi
axle steering, there are various ways in which it can be applied. The way you
are thinking of is known as "coordinated" mode, but there is also "crab mode"
in which all wheels point the same way allowing a large sideways component of
motion. Some vehicles also offer the ability to switch back to "less than all
the axles" steering, on either the front or rear axles. The only hint I've
found so far which indicates the usefulness of this is that front wheel only
steering may improve stability while driving at speed on roads.
The PDF documents on the mobile cranes section of the Liebherr web site are a
good source of information about this:
http://www.liebherr.com/us/
I also have some witterings about it on my website:
http://www.telepresence.strath.ac.uk/jen/lego/crane.htm
Throughout the years I have made several drive/steer axle mechanisms with
varying degrees of success, the most recent of which incorporated independent
suspension and *nearly* actually worked. One of these days I'll do something
proper with this and document it... the only trouble is the strain exploring
such mechanisms puts on your sanity.
Jennifer Clark
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To: lego-robotics@crynwr.com
Subject: Re: vision command idea...
Posted-Date: Wed, 13 Dec 2000 11:24:50 GMT
Date: Wed, 13 Dec 2000 11:24:50 GMT
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