Re: Transfering an Electrical Concept

[Jack Uretsky <jlu@HEP.ANL.GOV>]

Hi all-
        This is on the right track.  Mechanical impedance is a common
concept in acoustics, where it is the ratio of fluid velocity at a
point on a boundary divided by the pressure.  See Morse and Feshbach, p.
311.
                                Regards,
                                        Jack
On Wed, 20 Dec 2000, brian whatcott wrote:

> > 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!

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