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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!mimbres.cs.unm.edu!constellation!wildcat.ecn.uoknor.edu!rwmurphr
- From: rwmurphr@wildcat.ecn.uoknor.edu (Robert W Murphree)
- Subject: Re: Modeling Slip, Mobile Robotics, Kinematics, Simulation
- Sender: usenet@constellation.ecn.uoknor.edu (Usenet Administrator)
- Message-ID: <By021x.435@constellation.ecn.uoknor.edu>
- Date: Fri, 20 Nov 1992 05:32:20 GMT
- References: <1e8eknINNdn6@clover.csv.warwick.ac.uk> <1992Nov17.144824.26839@aio.jsc.nasa.gov> <56478@dime.cs.umass.edu>
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- Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA
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- connolly@rabbit.cs.umass.edu (Christopher Ian Connolly) writes:
-
- >In article <1992Nov17.144824.26839@aio.jsc.nasa.gov> graves@drseus.jsc.nasa.gov (Philip Graves) writes:
- >>In general, you can only get a qualitative idea of what might happen
- >>from any model of this type. It is impossible to find the perfect model
- >>because the friction depends on a plethora of factors, including
- >>everything from temperature to how long it has been since the floor
- >>was mopped and waxed.
-
- >We use Denning robots and are faced with a similar nightmare. One of
- >the things we're working on at the moment involves using visual homing
- >techniques to essentially recalibrate the robot at various points in
- >the environment, and coupling that with motion planning. I'd have to
- >agree with the other posters in that the best we can hope for (at
- >least in the case of the Denning) is some bound on the slippage, and
- >to take advantage of that bound when we can.
-
- Doesn't slip occur more often at times of high acceleration and
- fast turning? Could you have one braket for low acceleration and
- slow turning and another bracket for high acceleration and fast
- turning? I guess, realistically, it varies so much with the surface
- that its not worth doing. Plus, what if you run over a grease spot
- or some spilled liquid?
-