Forums

PI/PID controllers and tuning

Started by George Herold March 30, 2012
Hi guys/gals.  A bit of a problem has caused me to revisit PID/ PI controll=
ers and tuning.   I have this nice paper on the Ziegler=96Nichols tuning me=
thod that compares the closed loop period to the open loop step response of=
 the system.  It then shows the closed loop step response for different tun=
ing parameters.  But I can=92t seem to lay my hands on it... grumble.  I=92=
ll keep searching, but if you have a nice reference I=92d appreciate if you=
=92d share it.

Thanks,
George H.
On Mar 30, 3:21=A0pm, George Herold <gher...@teachspin.com> wrote:
> Hi guys/gals. =A0A bit of a problem has caused me to revisit PID/ PI cont=
rollers and tuning. =A0 I have this nice paper on the Ziegler=96Nichols >tu= ning method that compares the closed loop period to the open loop step resp= onse of the system. =A0It then shows the closed loop step >response for dif= ferent tuning parameters. =A0But I can=92t seem to lay my hands on it... gr= umble. =A0I=92ll keep searching, but if you have a nice >reference I=92d ap= preciate if you=92d share it. Ziegler J and Nichols N 1942 Trans. ASME 64 759 It's right at the end of my Peltier thermostat paper ... and apparently accessible in about 197,000 other places. http://en.wikipedia.org/wiki/Ziegler%E2%80%93Nichols_method As classic papers go, this has to be one of the more heavily cited examples, cited by 2590 other authors, which may put it in the top 200 ever. http://www.garfield.library.upenn.edu/essays/v13p045y1990.pdf Since the top scorer in 1990, with 187,652 citations was *Lowry O H, Rasebrorrgb N J, Farr A L & Ranrtrdl R J. Protein measurement with the Folin phenol reagent. J. Bid C&m. 193:265-75, 1951. (1/77) this may not be the right way of evaluating it's worth. Number two, with 59,759 citations, does seem to have been a bit more inspiring Laemroff U K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 227:680-5, 1970 -- Bill Sloman, Nijmegen
On Mar 30, 1:26=A0pm, Bill Sloman <bill.slo...@ieee.org> wrote:
> On Mar 30, 3:21=A0pm, George Herold <gher...@teachspin.com> wrote: > > > Hi guys/gals. =A0A bit of a problem has caused me to revisit PID/ PI co=
ntrollers and tuning. =A0 I have this nice paper on the Ziegler=96Nichols >= tuning method that compares the closed loop period to the open loop step re= sponse of the system. =A0It then shows the closed loop step >response for d= ifferent tuning parameters. =A0But I can=92t seem to lay my hands on it... = grumble. =A0I=92ll keep searching, but if you have a nice >reference I=92d = appreciate if you=92d share it.
> > Ziegler J and Nichols N 1942 Trans. ASME 64 759 > > It's right at the end of my Peltier thermostat paper ... and > apparently accessible in about 197,000 other places. > > http://en.wikipedia.org/wiki/Ziegler%E2%80%93Nichols_method > > As classic papers go, this has to be one of the more heavily cited > examples, cited by 2590 other authors, which may put it in the top 200 > ever. > > http://www.garfield.library.upenn.edu/essays/v13p045y1990.pdf > > Since the top scorer in 1990, with 187,652 citations was > > *Lowry O H, Rasebrorrgb N J, Farr A L & Ranrtrdl R J. Protein > measurement with the Folin phenol reagent. J. Bid C&m. 193:265-75, > 1951. (1/77) > > this may not be the right way of evaluating it's worth. Number two, > with 59,759 citations, does seem to have been a bit more inspiring > > Laemroff U K. Cleavage of structural proteins during the assembly of > the > head of bacteriophage T4. Nature 227:680-5, 1970 > > -- > Bill Sloman, Nijmegen
Thanks Bill, I was searching the web. There's a bazzilion pages on the PID controller. I decided I'm being too lazy, over the weekend I'll write down the equations and see if I can get the solution... At some point it should reduce to the driven harmonic oscillator. My other thought was just to model it in LT spice and play around. If I have time maybe I'll try both. George H.