We propose a robust non-fuzzy self-tuning scheme for fuzzy PI controllers (FPIC) for a class of systems. The output scaling factor (SF) of the proposed non-fuzzy self-tuning FPIC, termed as NF-STFPIC, is modified on-line based on the normalized change of error of the controlled variable. Performance of the proposed controller is evaluated for a pure integrating plus dead-time (IPD) and first-or...

The paper develops and investigates a novel set of constrained-output robust controllers with selectable response smoothing degree designed for an integrator-plus-dead-time (IPDT) plant model. input-output the IPDT system is internally approximated by several time-delayed, possibly higher-order models increasing complexity. Since they all contain single integrator, presented approach can be con...

Despite many advances in the field of dead-time compensators (DTCs) for unstable first-order plus (UFOPDT) processes, tuning, general, is manually carried out. Therefore, this paper proposes simple tuning rules a DTC intended to UFOPDT processes. The are based on relative dead time, desired closed-loop time constant, and achievable robustness. Besides, as practical implementation always discret...

Three new direct synthesis methods providing new simple rules of tuning the Pseudo-Derivative Feedback controller for integrating as well as stable or unstable first order processes with time delay are presented. The proposed control structure and tuning methods ensure smooth closed-loop response to set-point changes, fast regulatory control and sufficient robustness against parametric uncertai...

In this paper, a method of modeling the dynamics of electronic discussions is proposed based on the so called FOPDT model (First Order Plus Dead Time) known from the process control. Knowledge of the model points to possibility of estimating dynamic movements in discussions as well as understanding and designing their maintaining and guidance. Real discussions are processed.

This paper aims to present a general identification procedure for fractional first-order plus dead-time (FFOPDT) models. method is processes having S-shaped step responses, where process information collected from an open-loop step-test experiment, and has been conducted by fitting three arbitrary points on the reaction curve. In order validate this check its effectiveness of fractional-order m...

The performance of Generalized Predictive Control (GPC) algorithm without parameter estimation is studied to investigate its robustness property. A thermal process which can be represented by a general first order plus dead time model is selected as the test plant. GPC is found to be robust to changes in the time constant, less robust to process gain, but rather sensitive to the dead time. It i...

In the present work, heat exchanger process is selected for investigation, which can be modelled as first order plus dead time model. PI controllers using various tuning techniques that are Ziegler-Nichols, Shinskey, Skogestad, Liptak and Moros have been designed for the selected process. Important time response characteristics and integral error performance indices viz. ISE, IAE and ITAE are c...