Re: Transfering an Electrical Concept

[brian whatcott <inet@INTELLISYS.NET>]

This looked like such a promising book reference that I hurried along
to Amazon for a price:
Against "Similarities in Physics" they showed, John Northrup Shive
(Out of print)

and against Shive & Weber they showed
"Ahnlichkeiten in Der  Physik :
Zusammenhange Erkennen Und Verstehen"

which Babel Fish was unkind enough to translate as

"Ahnlichkeiten in physics: Zusammenhange detecting and understanding"

....but also out of print.

Oh well, it was getting late for Santa Claus - a used book search next...

Brian


At 09:15 12/20/00 -0500, Wolfgang Rueckner wrote:
> Shive and Weber have a nice discussion (chapt 12) of impedance matching in
> mechanical, acoustic, electrical, etc systems in their book "Similarities
> in Physics."  Very nice book, BTW.  ISBN 0-471-89785-7.
> Wolfgang
>
>
>
> > > At 10:51 AM -0600 12/17/00, brian whatcott,  you wrote
> >
> > > > The maximum power theorem is well known to electrical engineers.
> > > > It may be expressed like this:
> > > > Maximal power is transfered when the source impedance equals
> > > > the characteristic impedance of the output.
> >
> > At 17:44 12/18/00 -0500, Chuck Britton responded:
> > /snip/
> > > Using the analogy to the electrical case where P = IV , mechanics has
> > > P = F x v (velocity)
> > >
> > > Electrical impedance is V/I so I suggest that mechanical 'impedance'
> > > is F / v = m (a/v).
> >
> > > Chuck Britton
> >
> > Thanks Chuck.
> > One reason I imagine that mechanical impedance doesn't show up more
> > often is that you can't rely on linearity of forces etc., and the
> > quantities involved are not quite so easily measured.
> >
> > Sincerely
> >
> > Brian

brian whatcott <inet@intellisys.net>  Altus OK
                Eureka!