A new method for robust fixed-order H∞ controller design for uncertain time-delay systems is presented. It is shown that the H∞ robust performance condition can be represented by a set of convex constraints with respect to the parameters of a linearly parameterized primary controller in the Smith predictor structure. Systems with uncertain dead-time and with multimodel and frequency-domain unce...

The paper proposes a paradigm for control design suitable for poorly modeled plants with signi cant dead time An adaptive dead time compensator is developed which is substantially dif ferent to the standard Smith predictor and more generally applicable in practice A framework is developed for selecting the controller parameters using now stan dard design techniques such as synthesis It is argue...

This research creates a design methodology by synthesizing the Theory of Inventive Problem Solving (TRIZ) and cascade control based on Smith predictor. The particleboard glue supplying and dosing system case study defines the problem and the solution using the methodology proposed in the paper. Status difference existing in the gluing dosing process of particleboard production usually causes gl...

In the ice cream industry, the type of final desired product (large cartons (sqrounds) or ice creams on a stick) determine the viscosity at which the ice cream has to be produced. One of the objectives of the ice cream crystallization processes is therefore to produce an ice cream of specified viscosity. In this paper, a nonlinear control strategy is proposed for the control of the viscosity of...

This Paper shows the synthesis of Sliding Mode Controller using model predictive structure of the process. The Smith predictor architecture is combined with the Sliding mode control theory. Two different linear models, with deadtime, are simulated and the performance of the controller is evaluated.

It is known that both H 2 and H optimization problems for dead-time systems are solved by controllers having the so-called modified Smith predictor (dead-time compensator) structure. This note shows that this is also true for the L1 control problem. More precisely, it is demonstrated that the use of the modified Smith predictor enables one to reduce the standard L1 problem for systems with a si...

This paper proposes a new modified discrete Smith predictor control scheme for stable processes with dead time. The processes are assumed to be of stable first order with time delay, which are commonly used in process industry. The present scheme consists of two parts: predictive disturbance observer (PDOB) and Smith predictor structure. The PDOB scheme exhibits the property of DOB structure wh...

The design and implementation of Generalized Minimum Variance control laws for nonlinear multivariable systems that can include severe nonlinearities is considered. The quadratic cost index minimised involves dynamically weighted error and nonlinear control signal costing terms. The aim here is to show the controller obtained is simple to design and implement. The features of the control law ar...

A mixed sensitivity H∞ problem is solved for dead-time systems. It is shown that for a given bound on the H∞-norm there exist causal stabilizing controllers that achieve this bound if and only if a related finite-dimensional Riccati equation has a solution with a certain nonsingularity property. In the case of zero time-delay the Riccati equation is a standard Riccati equation and the nonsingul...

This note presents a frequency domain method to solve the standard control problem for processes with a single delay. For a given bound on the closed-loop norm, there exist proper stabilizing controllers that achieve this bound if and only if both the corresponding delay-free problem and an extended Nehari problem with a delay (or a one-block problem) are all solvable. The solvability of the ex...