Re: Best Book on PID ??

From: Rhett Oracle (rhett97_at_marketbanker.com)
Date: 11/25/04

  • Next message: Lasse Langwadt Christensen: "Re: Best Book on PID ??" 
    Date: Thu, 25 Nov 2004 20:44:10 GMT

    On Thu, 25 Nov 2004 09:45:23 -0800, John Larkin wrote:

    > On Thu, 25 Nov 2004 12:28:37 -0500, Phil Hobbs
    > <pcdhSpamMeSenseless@us.ibm.com> wrote:
    >
    >>I don't disagree that there are lots of similarities, or that there's a lot
    >>of jargon in control system design that seems intended to preserve job
    >>security rather than make concepts clear. (There's a lot of that in some
    >>optics disciplines too--it isn't just an EE problem. Not to mention all of
    >>anthropology.) If I'm designing e.g. a laser temperature controller, I use
    >>Bode plots: one for each of several representative choices of ambient
    >>temperature and thermal forcing. PLL design with nonlinear tuning is
    >>similar. Not everything is that simple, however.
    >>
    >>Lots of control systems have to work in situations where an ugly settling
    >>transient will cause destruction--from burned cookies and broken drive belts
    >>to loss of life and property. There are very few purely electronic
    >>situations (i.e. other than driving mechanical devices or large magnets)
    >>where a poor transient response is that serious.
    >>
    >>Ordinarily, with an amplifier driving a speaker, say, you can have a few pops
    >>and bangs, but no great harm is done, and they can be tuned out during
    >>debugging. The nonlinearity is of a simple and intuitive sort, and there is
    >>no complex coupling. There is also usually no external forcing, unlike e.g.
    >>a motor controller which may have very different loads at different times.
    >>It isn't possible to test every situation, and it's the ones we haven't
    >>thought about that will turn round and bite us in the backside. Systems that
    >>are uncoupled during normal operation, but become coupled due to faults and
    >>transients, are a common source of this.
    >>
    >
    > It's interesting that a lot of real-world control loops leave theory
    > way behind, except for the fairly boring region of near-steady-state
    > operation around null. The hairy parts, the transient and exception
    > conditions, revert to art, instinct, and maybe simulation.

    Just like life! Imagine that!

    > I like systems like that.

    Me, Too!
     
    > John

    ;^j
    R.

  • Next message: Lasse Langwadt Christensen: "Re: Best Book on PID ??"

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    • Re: Best Book on PID ??
      ... >of jargon in control system design that seems intended to preserve job ... PLL design with nonlinear tuning is ... >Lots of control systems have to work in situations where an ugly settling ... >where a poor transient response is that serious. ...
      (sci.electronics.misc)
    • Re: Best Book on PID ??
      ... >of jargon in control system design that seems intended to preserve job ... PLL design with nonlinear tuning is ... >Lots of control systems have to work in situations where an ugly settling ... >where a poor transient response is that serious. ...
      (sci.electronics.design)
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    • Re: Best Book on PID ??
      ... >>of jargon in control system design that seems intended to preserve job ... PLL design with nonlinear tuning is ... >>Lots of control systems have to work in situations where an ugly settling ... >>where a poor transient response is that serious. ...
      (sci.electronics.design)
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