Subject:
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Re: Speed surges
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Newsgroups:
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lugnet.trains
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Date:
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Sun, 20 Feb 2000 02:45:21 GMT
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Viewed:
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873 times
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I've noticed this as well. At the GATS show today, I asked others to observe
it just to make sure it isn't just me. I notice it mostly when the train goes
through an s-curve. The front of the train doesn't surge, but the back does.
I think Larry is right. It relates the the changes between linear and angular
velocity as the train moves through.
Ben Fleskes
BS Mechanical Engineering (among other things)
In lugnet.trains, Larry Pieniazek writes:
> Recent "big loco" and "big car" projects by others have started me
> thinking about speed surges and wondering if there is a relation.
>
> I notice that my longer locos and longer (car length and number of cars)
> trains experience high frequency oscillations in speed and I am really
> starting to bcome convinced that it's due to the changes in length of
> the train between when you are on a curve and when you're on a straight
>
> Take Mike's AX that he just posted. There must be a least a 5 stud
> difference that the two trucks need to make up/absorb when switching
> from a curve to a straight and back, due to the chordal distance from
> one pivot point remaining fixed, but the track distance (and thus the
> distance the trucks travel) changing from a straight where they are the
> same, to a curve where the chordal distance and the circumferential
> distance being significantly different.
>
> Any ME's in the audience? Am I all wet?
>
> --
> Larry Pieniazek - lpieniazek@mercator.com - http://my.voyager.net/lar
> http://www.mercator.com. Mercator, the e-business transformation company
> fund Lugnet(tm): http://www.ebates.com/ ref: lar, 1/2 $$ to lugnet.
>
> Note: this is a family forum!
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Message has 2 Replies:
 | | Re: Speed surges
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| (...) Well, my trains are usually long enough and massive enough that I see effects on the locomotives. You can hear the motors suddenly starting to work harder as they come into a curve, and surge forward as they come out of it. (the momentum of (...) (25 years ago, 20-Feb-00, to lugnet.trains)
| | | Re: Speed surges
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| Ben Fleskes wrote in message ... (...) observe (...) goes (...) does. (...) angular (...) I have also noticed it... not just in the Lego trains, but you will see it in HO, N and other trains, too. I believe Ben is right. Not just 'cause he's an ME. (...) (25 years ago, 21-Feb-00, to lugnet.trains)
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Message is in Reply To:
| | Speed surges
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| Recent "big loco" and "big car" projects by others have started me thinking about speed surges and wondering if there is a relation. I notice that my longer locos and longer (car length and number of cars) trains experience high frequency (...) (25 years ago, 20-Feb-00, to lugnet.trains)
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