Adaptive Control Of Isothermal Reactor With Complex Reaction

The role and importance of the simulation rises with the increasing speed of computers and simulation tools provided nowadays. Safety and less money and time demands gives a computer simulation big advantage over the experiments on a real system or its model. The paper deals with simulation of an adaptive control on a nonlinear system represented by a Continuous Stirred Tank Reactor (CSTR). This system is mathematically described by a set of Ordinary Differential Equations (ODE) which are first solved numerically to obtain steady-state and dynamic behaviour of the system. The adaptive control is based on the recursive identification of an External Linear Model (ELM) as a representation of the originally nonlinear system. The polynomial approach together with the pole-placement method gives sufficient control results although the system has negative control properties

Experimental study of radiative shocks at PALS facility

We report on the investigation of strong radiative shocks generated with the high energy, sub-nanosecond iodine laser at PALS. These shock waves are characterized by a developed radiative precursor and their dynamics is analyzed over long time scales (~50 ns), approaching a quasi-stationary limit. We present the first preliminary results on the rear side XUV spectroscopy. These studies are relevant to the understanding of the spectroscopic signatures of accretion shocks in Classical T Tauri Stars.Comment: 21 pages, 1 table, 7 figure

Operational amplifiers

This book provides the reader with the practical knowledge necessary to select and use operational amplifier devices. It presents an extensive treatment of applications and a practically oriented, unified theory of operational circuits.Provides the reader with practical knowledge necessary to select and use operational amplifier devices. Presents an extensive treatment of applications and a practically oriented, unified theory of operational circuit

Nase moznosti rozsireni laboratornich vysetreni muzskeho faktoru neplodnosti.

The thesis evaluates theoretical and practical possibilities of laboratory examinations of the male infertility factor in a center of assised reproduction. Besides urological and genetic examinations the author tried to introduce, verify and evaluate the contribution of the hormonal profile of subfertile men. The spectrum of examinations in the andrological laboratory was enlarged by examination of biochemical parameters of seminal plasma and by microbiological examination. Among the biochemical parameters of seminal plasma, the highest importance (p=0,05) is to be seen in the examination of alpha-glucosidase, reflecting the function of epididymis. Together with the determination of fructose, a marker of seminal vesicles function, these examinations help to precise the diagnosis of obstructive azoospermia. Microbiological tests confirmed a negative influence of sperm infection by pathogens on the result of a therapeutic cycle of in vitro fertilization and embryotransfer and on the fertility of men. The question of the role of chlamydia infection in male infertility remains, in spite of developed diagnostic possibilities, solved only in part.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Model predictive control for buildings with active one-pipe hydronic heating

One-pipe hydronic heating systems in their active (decentralized pumping) form promise great benefits over traditional two-pipe variable volume systems, and even more so over variable air volume systems. The heat exchanger units are connected in series, which presents its challenges and opportunities. This paper presents a model predictive controller capable of harnessing as many benefits as there is in the system when used in a building. A case study on a small office building illustrates the capabilities and validates the concept

Comparison of Two Identification Models Used in Adaptive Control of Continuous-Stirred Tank Reactor

The goal of this paper is to compare two identification methods – continuous-time and discrete-time. The continuous-time identification model is more accurate but not very suitable for on-line identification. This disadvantage was overcome with the use of differential filters. On the other hand, discrete-time identification model has is more suitable for identification but less accurate. Compromise can be found in the delta model as a special type of the discrete-time model parameters of which are related to the sampling period. The adaptive approach is based on the choice of the External Linear Model, parameters of which are identified recursively which satisfies the adaptivity of this system. Proposed control strategy was applied on the mathematical model of the Continuous Stirred-Tank reactor as a typical nonlinear lumped-parameters system used in the industry

Adaptive LQ Cascade Control of a Tubular Chemical Reactor

The paper deals with adaptive LQ cascade control design of a tubular chemical reactor with an exothermic consecutive reaction. The control is performed in primary and secondary control-loops where the primary controlled output of the reactor is the concentration of a main reaction product and the secondary output is the mean temperature of the reactant. A common control input is the coolant flow rate. The controller in the primary control-loop is a nonlinear P-controller with the gain calculated using simulated or measured steady-state characteristics of the reactor. The controller in the secondary control-loop is a LQ adaptive controller. The proposed method is verified by control simulations

Adaptive LQ Cascade Control of a Tubular Chemical Reactor

The paper deals with adaptive LQ cascade control design of a tubular chemical reactor with an exothermic consecutive reaction. The control is performed in primary and secondary control-loops where the primary controlled output of the reactor is the concentration of a main reaction product and the secondary output is the mean temperature of the reactant. A common control input is the coolant flow rate. The controller in the primary control-loop is a nonlinear P-controller with the gain calculated using simulated or measured steady-state characteristics of the reactor. The controller in the secondary control-loop is a LQ adaptive controller. The proposed method is verified by control simulations