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A number of tuning rules have been reported in literature for unstable first order plus time delay processes. However, at least to the author knowledge most of the reported methods fail to give robust performance for process models with time delay equal to or greater than the process time constant. In this work, a robust tuning method based on the modified Smith predictor is proposed for unstable...
Use of PID controller is very popular in process industry. Temperature control is one of the most common processes where use of PID control became essential. FOPDT and SOPDT model are designed by multi scale control technique. The performance of this method is compared with conventional. Simulation and experimental results are presented to analyze the performance.
This work presents significant developments in Networked Control Systems based on PID, Internal Model Control and Smith Predictor algorithms. The main purpose of this research paper is to study the performance and robustness offered by these control design methods in handling the challenging control problem encountered with systems subject to time-varying delays and dropouts. It is expected that proposed...
This paper describes the design of 2DOF controllers that are tuned by modified multiple optimal dominant poles tuning method (MODPP) for the first order process with long time delay. This process can be approximated to an integral plus time delay process. In case of plants with proportional characters that are often tuned from the point of view of servo control, the regulatory control is a trade-off...
In process industries, cascade control is one of the commonly used techniques to improve the performance of a single loop control structure when there are disturbances associated with the manipulated variable. In the present work, tuning rules have been proposed for series cascade control structure considering stable and integrating process models with time delay. The primary controller is a Proportional-Integral-Derivative...
The aim of this paper is to design a double controller scheme for autonomous tuning of set-point tracking response and disturbance rejection response. Thus it improve the three performance attributes of control loop include set-point tracking response, disturbance rejection response and robustness. The proposed scheme provides additional flexibility for reducing the noise due to actuator chattering...
This paper proposes a novel alternative method to graphically calculate all feasible gain and phase margin specifications-oriented robust PID controllers to stabilize open-loop unstable high-order time delay (OLUHOPTD) systems. Distinguished from other proposed methods, in addition to the conventional positive gain margin (GM) and phase margin (PM), the negative GM is particularly considered in this...
In this paper, a simplified decoupling method is proposed for multivariable processes by introducing coefficient matching to obtain a stable, proper, and causal simplified decoupler. Accordingly, transfer functions of decoupled apparent processes can be expressed as a set of n equivalent independent processes and then derived as a ratio of the original open-loop transfer function to the diagonal element...
This paper presents a new simplified approach for the design of dead time compensators for processes with long dead time. The approach is based on a modified structure of the Smith predictor that allows to isolate the disturbance and set-point responses and thereby, providing two-degree-of-freedom control scheme. The proposed structure is easy to analyze and tune. Using an estimation of the dead time...
PID controller has simple structure and easy applicability with strong performance robustness. Decentralized PID controller and decoupling PID controller are widely adopted in the control of two-input-two-output (TITO) processes. Firstly, a simple decoupling controller matrix and a desired dynamic decoupling controller matrix are designed according to the idea of coupling matrix. And then three schemes...
In terms of double-controller design technology and relay feedback identification method an autotuning IMC structure with two degree of freedom (TDF-IMC) is proposed in this paper. The model parameters of the controlled process are identified via a modified relay feedback identification method. The setpoint tracking IMC controller and disturbance attenuation IMC controller are designed, respectively,...
The industrial process control systems usually encounter the time delay. Commonly, such the systems are controlled by the industrial PID controllers consisting of proportional-integral (P-I) elements existing in forward path for input tracking and load regulating proposes, and derivative (D) element existing in feedback path to reduce noises. Under harsh industrial environment, the process model is...
In this paper, model output following control based on command generator tracker is designed and applied to networked aluminum plate thermal process. One of the most important problems on networked system is the time delay problem. An explorative technique is that time delay is approximated as high order rational transfer functions. Therefore, the approximated high order system must be analyzed. Model...
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