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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...
This paper proposes an analytical design method for the linear multivariable non-square systems with multiple time delays and nonminimum-phase zeros. Based on Internal Model Control (IMC) theory, a multivariable non-square controller of full matrix form is designed for the non-square processes. In the controller design procedure, a simple method is presented to factor the transfer function matrix...
Open-loop unstable systems with time delay are difficult to control using routine control methods. To solve this problem, an improved internal model control scheme, which adds a PD controller to traditional IMC structure, is proposed. Set point tracking performance and robustness can be designed independently. The tuning formula of PD controller is confirmed by a new performance index function. Fuzzy...
This communication addresses the problem of tuning a PID controller for step response. The tuning is based upon a first order plus time delay (FOPTD) model and aims to achieve a step response specification while taking into account robustness considerations. The industrial ISA-PID formulation is chosen. A tuning rule is derived first where the four parameters of the ISA-PID are determined by means...
Researching the application of neural networks and the Smith predictor in the system with time-delay, considering the delayed problem of the system, a new control approach is introduced, which can realize the predictive control by combining the Smith predictor with the NN and PID control which is tuned by BP neural network through the predictive errors effectively. We use the RBFNN in the Smith predictor,...
Proposes a method for the automatic tuning of cascade structure CNC controllers. The design takes into account constraints on the system such as delays induced by numerical control effects and elasticity of bodies. The robustness of the algorithm is ensured by requiring minimal stability margins.
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