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Unread 09-08-2002, 07:29
Lloyd Burns Lloyd Burns is offline
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Gui:

You get it. I'd think you might even look at decreasing the friction coefficient ('mu') if you can stall your motors. Changing the gear ratios is also a possibility.

The process is indeed recursive, trying out and changing things and trying again. This is another advantage of the older teams: after a few times through, you have a fair idea of what the values will be :-). Much of engineering, involves approximating, whereby you fill in the equations with guesses, work it out, try something, measure the results, and plug in better guesses, which give better answers.

How much is your robot going to weigh ? Aren't you usually just a little over or a bit light ? Or do you calculate the weight of your completely CADded model before you build ? Even then, do you ever get it exactly right ?

Even flying VFR, you plot a course, and fly the heading, then you check where you are, and correct the heading, as you fly.

Jon:

"Mu > 1" merely means that the surfaces have more frictional force along the floor, say, than the weight (normal force) that is pushing the surfaces together. Mu = Fparallel/Fnormal. One text book had a pair at mu = 1.05. Lifting the goals is all about increasing Fnormal, while experimenting with different tire surfaces is about increasing 'mu', both in the interest of increasing Fparallel (Fhorizontal ?)

Last edited by Lloyd Burns : 09-08-2002 at 07:48.
 


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