Automatic Control Technology Research Articles

A general model for single-sludge wastewater treatment systems

In order to promote low-carbon sustainable operational management of the wastewater treatment plants (WWTPs), automatic control and optimal operation technologies, which devote to improving effluent quality, operational costs and greenhouse gas (GHG) emissions, have flourished in recent years. There is no consensus on the design procedure for optimal control/operation of sustainable WWTPs. In this review, we summarize recent researches on developing control and optimization strategies for GHG mitigation in WWTPs. Faced with the fact that direct carbon dioxide (CO2) emissions (considered biological origin) are generally not included in the carbon footprint of WWTPs, direct emissions (nitrous oxide (N2O), methane (CH4)) and indirect emissions are paid much attention. Firstly, the plant-wide models with GHG dynamic simulation, which are employed to design and evaluate the automatic control schemes as well as representative studies on identifying key factors affecting GHG emissions or comprehensive performance are outlined. Then, both traditional and advanced control methods commonly used in GHG mitigation are reviewed in detail, followed by the multi-objective optimization practices of control/operational parameters. Based on the mentioned control and (or) optimization strategies, a novel design framework for the optimal control/operation of sustainable WWTPs is proposed. The findings and design framework proposed in the paper will provide guidance for GHG mitigation and sustainable operation in WWTPs. It is foreseeable that more accurate and appropriate plant-wide models together with flexible control methods and intelligent optimization strategies will be developed to satisfy the upgrading requirements of WWTPs in the future.

Technology of automatic mold bath level control.

Technology of automatic mold bath level control.

飛行制御技術の展望

飛行制御技術の展望

Automatic Control Strategies for Urban Stormwater

A number of United States cities have applied, or plan to study, automatic computer control technology to urban stormwater management. Several control strategies are compared, from simple set point or reactive control, to stochastic optimal control with full storm forecasting carried out adaptively in real-time. A simulated real-time experiment was conducted which generated storm inflow forecast errors that document the sensitivity of control strategy performance to forecast error. The qualified conclusions of this study are that strategies using limited lead-time forecasts are safer in that they guard against untreated overflows occurring. If the size of the storm indicates that overflows cannot be avoided, then more complete forecasting and sophisticated stochastic control is needed to manage the time and space distribution overflows, overflows so as to minimize adverse impacts on the receiving waters. /Author/

Synthesis and Analysis of Correlative Extremum Systems I

In automatic control technology, extremal systems are widely used whose task consists in automatic search and tracking of the extremal value of the output characteristic of the plant by varying its input variables. On the other hand the technology of devices of processing of random processes is extensively using correlation methods. Recently, a great increase has been noted in the number of papers devoted to the synthesis and analysis of systems combining the extremal control principle with correlation processing of the signals arriving from the controlled plant. This opens the possibility of developing control systems of a new type (correlative extremum systems) distinguished by high noise-immunity and great accuracy of operation. In this paper, as well as in Beloglazov's companion paper published in this collection, the first attempt is being made to review possible methods of design of correlative extremum systems, the main problems of analysis of processes occurring in such systems irrespective of the specific nature of the controlled plant, and possible domains of application of such systems.

On the Technical Composition and Development Trend of Fieldbus

Fieldbus technology is the forefront technology of digital communication in contemporary industry. It is the integration of computer technology, communication technology and automation control technology. It is also the embodiment of information technology and measurement technology in the information age. Fieldbus technology is a pioneer in the era of industrial digital communications, and its emergence is causing an unprecedented technologi- cal revolution in the field of industrial control. In the future development of fieldbus technology, China should combine the actual situation of social development, establish a long-term development goals, and humbly learn from the advanced countries of the world’s advanced experience, access to foreign countries advanced technology and information to master the maturity of foreign development technology. Based on this paper, the technical structure and development trend of fieldbus are analyzed.

Automatic Control in the Presence of Process Lags

Abstract In this paper, the methods of “Quantitative Analysis of Process Lags” developed in a previous paper are extended to include automatic control. Carrying on the idea of representation by liquid-level systems, a specific system is postulated as a model for a typical industrial process which may or may not be thermal. Continuing the quantitative approach, the mathematical machinery is demonstrated by which the operation of control on processes may be investigated. A selected succession of controllers, characterized by the laws of control which govern them, are considered in connection with their performance on the model system. Although no attempt has been made to formulate rules governing the proper application of the various types of controllers considered or governing the adjustment of any of these individual types, the authors consider that analyses of this sort may well serve as a guide to practical theorems in a technology of automatic control.