Subject:
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Re: Flywheels in LU (was Re: what is the use of a caboose?
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 3 Aug 2001 13:04:59 GMT
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Viewed:
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1213 times
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Larry Pieniazek wrote:
>
> In lugnet.trains, Tim David writes:
>
> > On similar lines London Underground has a proposal for (and is testing) a
> > scheme using flywheels mounted trackside. The principle is that current
> > generated by braking trains (back EMF?) drive the flywheels and accelerating
> > trains use the power. This reduces LU's total power consumption, spreads the
> > peak loadings on the sub-stations, helps reduce wear on brakes and reduces
> > heat build in the tunnels (which saves money in heat extraction) up from
> > braking.
>
> Why flywheels? Why not just put the power back into the mains? (regenerative
> braking) US electric locos do this, I believe...
>
> In this case the flywheels seem to add a layer of complexity (and a source
> of loss) that isn't needed unless I am missing something. It would be a neat
> model though!
I thought they were using flywheels in diesels, but I couldn't find too
much. Most of the braking power though is supplied not by charging a
battery, but by dissipating the energy through resistors (some portion
of those cooling fans are actually for the dynamic braking restive load,
not to cool the engine).
Hmm, interesting find - an SD40 operator's manual:
http://gelwood.railfan.net/manual/sd40-man.html
And here's a paper on use of flywheel energy storage for high speed
trains:
http://www.ee.uidaho.edu/trainnet/reports/interim/html/intrep8.htm
--
Frank Filz
-----------------------------
Work: mailto:ffilz@us.ibm.com (business only please)
Home: mailto:ffilz@mindspring.com
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Message has 2 Replies:
 | | Re: Flywheels in LU (was Re: what is the use of a caboose?
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| (...) I hadn't heard of ANYONE doing this for any serious energy storage (most reciprocating engines use flywheels to smooth out the motion generated, of course, but this would be different). Do you have any info on where you heard this? (...) Some (...) (23 years ago, 3-Aug-01, to lugnet.trains)
| | | Re: Flywheels in LU (was Re: what is the use of a caboose?
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| (...) other fallen flag railroads' reference site: (URL) halfway down this page, you find operator manuals for the S-1, S-2, RS-1,C420, E-8, F-7, GP-7, GP-35 and several U-series locomotives. Neat stuff. -chris (23 years ago, 3-Aug-01, to lugnet.trains)
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Message is in Reply To:
| | Flywheels in LU (was Re: what is the use of a caboose?
|
| (...) Why flywheels? Why not just put the power back into the mains? (regenerative braking) US electric locos do this, I believe... In this case the flywheels seem to add a layer of complexity (and a source of loss) that isn't needed unless I am (...) (23 years ago, 2-Aug-01, to lugnet.trains)
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