[SI-LIST] Re: Shive wave machine video
- From: "Smith, Larry" <larrys@xxxxxxxxxxxx>
- To: "colin_warwick@xxxxxxxxxxx" <colin_warwick@xxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 10 Apr 2012 21:42:52 +0000
Very nice video! It pulls together a lot of disciplines.
If we think of the current waveform (rather than voltage) the open circuit and
closed circuit reflections fit with the lecture. The forcing function would be
current. It comes back right side up (current doubles) at short circuit and
upside down for an open circuit (opposite polarity, current cancelation).
I think we could draw another analogy where the forcing function is voltage and
the voltage doubles at the far end of an open line. This is more in line with
our EE intuition.
Forcing a current works better with his impedance (not admittance) discussion
later in the lecture.
Regards,
Larry Smith
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of colin_warwick@xxxxxxxxxxx
Sent: Tuesday, April 10, 2012 7:48 AM
To: si-list@xxxxxxxxxxxxx
Cc: istvan.novak@xxxxxxxxxxx
Subject: [SI-LIST] Re: Shive wave machine video
Hi,
Me again.
Istvan sent me an interesting message off-list questioning Shive’s analogy
between electrical open and mechanical clamped. His drift was "An electrical
open 'feels' more like a mechanical free end." We agreed the answer might be of
general interest so I’m posting an explanation here:
http://signal-integrity.tm.agilent.com/2012/shive-wave-machine-allows-visualization-of-wave-properties#math
Best regards,
-- Colin
------
From: Istvan Novak [mailto:istvan.novak@xxxxxxxxxxxx]
Sent: Tuesday, April 10, 2012 9:01 AM
To: WARWICK,COLIN (A-Americas,ex1)
Subject: Re: [SI-LIST] Re: Shive wave machine video
Hi Colin,
Thanks for posting the link. Very nice illustrations...
I am at loss with one detail though. On the comparison chart among mechanical,
electrical and acoustic transmission lines and reflections, I see short circuit
describing open end (on the left of the screen capture), and open circuit for
'restrained' or shorted end. Does this make sense to you? Probably I am just
not familiar with the nomenclature here...
Regards,
Istvan
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