ziegler nichols method

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i have i project to do for my college, i have to prove why Ziegler Nichols method which says that at 63% of the signal for controling whith p the fp = 1/l, fi = 0, fd = 0 pi the fp = 0,9/l, fi = 0,3/lx, fd = 0 pid the fp = 1,2/l, fi = 0,6/lx, fd = 0,6x/l

where can i find some information to aprove that this way is the best way for controling? thank you!

-- stefanos synodinos (s_synodinos@hotmail.com), December 17, 2004

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