Csilla Bányász

Optimality of two-degree of freedom controllers in H 2 - and H ∞ -norm space, their robustness and minimal sensitivity

Abstract A special generic structure of two-degree of freedom controllers and a connected closed-loop system parametrization with optimal regulator design methods are discussed. The optimality is expressed by two simple serial compensators based on the concept of the nearest inverse and can be performed in H 2 - and H ∞ -norm space. It is shown how these optimal filters are computed. The optimal sensitivity properties of this scheme are also analysed.

A New Structure to Design Optimal Control Systems

Abstract A new structure is introduced to design optimal pole placement controllers avoiding the explicit solution of polynomial equations.

A simple PID regulator applicable for a class of factorable nonlinear plants

Simple discrete-time PID tuning methods are extended for Hammerstein and Wiener type block-oriented cascade factorable nonlinear models. It is shown that this extension is quite straightforward for both IS and IU Hammerstein models, however the extension can be performed only for IS Wiener models.

A novel adaptive control system for raw material blending

We discuss a new generic optimal controller structure for raw material blending in the cement industry. We focus on an important phase of the proportioning-burning-grinding operation triplet that essentially determines the cement quality; namely, the composition control of the raw mill system. We begin by describing the application of a generic optimal controller structure to this important phase, followed by a discussion of the control engineering background and the design of the realized controller. Finally, the control algorithm is discussed in a technology-independent manner.

A new pole-placement regulator design method

A new pole placement controller structure and regulator design method is introduced avoiding the explicit solution of polynomial equations. An applicable strategy for iterative control refinement based on this generic scheme is presented and illustrated by simulation examples.

Direct relationships of performance, robustness measures and amplitude constraint

The paper presents an approach of how to compute direct relationships between performance, robustness measures and amplitude constraint of the regulator output for two degree of freedom time delay control systems. The relationships can be calculated only numerically and represented by graphical plots.

Closed-Loop Parametrization Schemes: Identification of the K-B and d-Y Parameters

Abstract The paper discusses and compares several (Youla, d-Youla, D-Youla, Youla-Kucera, d-Youla-Kucera, D-Youla-Kucera, Keviczky-Banyasz) closed-loop parametrization senernes. New identificaticn schemes are presented for the estimation of the Youla, d-Youla and K - B -parameters.

An adaptive PID regulator based on time delay estimation

A new approach is presented for the estimation of the time delay. It can be applied together with most stochastic-deterministic recursive adaptive schemes, estimating the process parameters at the same time. Simple design formulas are given for automatic tuning of the proportional integral derivative (PID) regulator parameters.<<ETX>>

An adaptive and iterative scheme for PID auto-tuning based on design formulae

The first classical design principle for PID regulators was to cancel the two major time constants of a plant and tune the integrating action to the remaining low order time delay process. This paper renew the original approach introducing a stochastic-deterministic iterative or recursive adaptive scheme, estimating the process parameters and the time delay at the same time, and using design formulas for automatic tuning of the regulator parameters.

Designing high performance two-degree of freedom controllers

A new generic optimal controller structure and a related regulator design method is introduced. The optimality is expressed by two simple serial compensators. It is shown how these filters-depending on the reference signal, the output disturbance and the invariant process factors-should be selected by the solutions of Diophantine equations if optimality is important. The optimal sensitivity properties of the new scheme is also analyzed and if is shown that this controller has the minimum variance to unknown process variations.