I'm fairly sure that Jim is right. I never had to worry about PID machine
control before the late sixties and by the mid-seventies the concepts were
firmly in place and in use. It certainly was the appearance of solid state
industrial controls which made it all possible. And those ideas have made
possible some system performance that I recall as being impossible only a
few years earlier.
Lee Mushel
----- Original Message -----
From: "Jim Lux" <jim...@earthlink.net>
To: "Poul-Henning Kamp" <p...@phk.freebsd.dk>; "Discussion of precise time
and frequency measurement" <time-nuts@febo.com>
Sent: Monday, January 26, 2015 8:21 AM
Subject: Re: [time-nuts] D term (was no subject)
On 1/26/15 5:55 AM, Poul-Henning Kamp wrote:
--------
In message <54c5a270.7090...@earthlink.net>, Jim Lux writes:
And there's decades, if not centuries, of experience with P, PI and PID
controllers in a practical sense.
Not quite a century I belive: Only the advent of electronics formalized
the theory and developed the practice.
Almost all mechanical "governors" er pure P.
Maxwell strikes again
http://upload.wikimedia.org/wikipedia/commons/b/b1/On_Governors.pdf
definitely more than P controllers..
cups with liquid (Siemens governor), nonlinear mechanisms, etc.
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