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zn closed loop method - TechTeach
Article:Ziegler-Nichols closed -Loop MethodFinn HaugenTechTeach17. July 20101 IntroductionZiegler and Nichols published in 1942 a paper [1] where they described twomethods for tuning the parameters of P-, PI- and PID controllers. Thesetwo methods are theZiegler-Nichols closed loop method1, and theZiegler-Nichols open loop method2. The present article describes theclosed-loop method , while the open-loop method is described in anotherarticle (available at ).Ziegler and Nichols [1] used the following definition of acceptable stabilityas a basis for their contoller tuning rules: The ratio of the amplitudes ofsubsequent peaks in the same direction (due to a step change of thedisturbance or a step change of the setpoint in the control loop) isapproximately 1/4, see Figure 1:A2A1=14(1)However, there is no guaranty that the actu
Article: Ziegler-Nichols’Closed-LoopMethod FinnHaugen TechTeach 17. July2010 1 Introduction ZieglerandNicholspublishedin1942apaper[1]wheretheydescribedtwo
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