Showing papers in "IFAC Proceedings Volumes in 1971"

TL;DR: It is considered that at least in the next decade the power of relatively small autonomous man/ computer systems linked by both hard and soft data, will out-perform their larger, more deterministic, competitors if, and only if, a thorough examination of the man/computer interaction is made.

TL;DR: In this paper, an approach to dynamic modeling and on-line carbon estimation based on waste gas analysis in a basic oxygen furnace is described, and a two-stage dynamic model is developed using time series analysis and empirical information on the decarbonization rate.

TL;DR: An attempt is made to describe present thinking on the technical, economic and human aspects of computer control as well as assess the interaction between those three topics.

TL;DR: In this paper, the installation and use of on-line computer control is seen in the context of the development of a hierarchy of mathematical models of the production situation and their use to maximise profits at all levels.

TL;DR: Rational design of a process control system using an on-line computer requires a definition of the total control task and an allocation of function between the human operator and the machine, with emphasis on the function performed by the operator in modern computer control systems.

TL;DR: Contingency control has been formulated as a constrained optimization problem in which the imposition (relaxation) of security constraints increases (decreases) the security of the system as discussed by the authors.

TL;DR: In this article, an on-line real-time hill climb is used to tune the parameters in an incremental three-term direct digital controller, which is carried out by taking the plant through a cycle comprised of a step upwards, a pause, a step down and then a pause.

TL;DR: The interplay of management control will allow the expansion of influential consideration, provide more responsiveness to dynamic considerations and result in a better perspective to criteria priorities toward attaining overall operation efficiency.

TL;DR: In this article, a rotary lime kiln used in the recausticizing process of a (kraft) paper mill, R mathematical model is presented, the form of the mathematical description is obtained on the basis of the mass and energy balances.

TL;DR: The Autocook system simulates on-line the lignin dissolving reaction-and controls the charging of the digesters, production rate, product quality and steam consumption of thedigester house and practical results from working installations.

TL;DR: An optimal non-interactive control structure, whose elements are simple algebraic functions of the coefficients in the linearized roll gap equations, has been derived analytically from the basic model equations.

TL;DR: In this article, an exploratory computer control project for the digital control of a cement plant was described, where simulation techniques are essential tools for the successful design and implementation of digital control in industry.

TL;DR: In this article, a new and more powerful mathematical descriptive model of the Kraft pulping process is presented, which includes functions giving representations of process yield and process K number or an analytic representation of the extent of lignin extraction.

TL;DR: A digital simulation technique for sampling systems was developed by dealing with the two-variable control system representing the pressure and the steam temperature control, respectively of a steam generator.

TL;DR: In this article, a mathematical model of the cooking process obtained on hand of a physical model with the use of the factorial and simplex experiment planning methods expressed in the form of an equation system of the first and second order is presented.

TL;DR: It is shown, how a user-written multivariable control program, related to a clinker cooler, can be integrated into PPCP, and a saving in programming, at least 10-fold is claimed.

TL;DR: The use of a digital computer for the control of batch reactors, used in the manufacture of unsaturated polyester resins, is described in this article, where the reason for the project, objectives and economic justification for a computer system are given.

TL;DR: In this article, the operation of an on-line computer control scheme for a pilot scale rotary drier is described, where start-up and shut-down of the drier are efficiently and safely accomplished by a combination of operator and computer actions.

TL;DR: In this article, a mathematical model of the two kinds of metallurgic furnaces of reheating is described, that is, the impelling furnace where the thermic exchanges are unidirectional (continuous sheet) and the stringers into which a given space is kept between two products.

TL;DR: In this article, a mathematical model of a lime recovery furnace was developed comprising a system of non-linear differential equations in partial derivatives of the 1st order, and an algorithm was suggested for obtaining the impulse transfer function moments directly from the system of differential equations without the application of complicated transfer function.

TL;DR: The paper describes the resolution of this conflict between flexibility and standardization in a new, configurable, “fill-in-the-blanks”-oriented process control software system, called IMPAC.

TL;DR: A brief account is given of the method used by PIRA in the variance partition analysis of grammage and caliper variations in paper and board.

TL;DR: In this paper, the authors describe part of the on-line measurements and identification carried out on a tandem cold rolling steel mill as part of a project to develop an improved computer control system for the mill.

TL;DR: The computer tasks which include sequencing of all the stages of the batch process, both set-point control and DDC of the process parameters, blending of the completed batches of polymer, monitoring for alarm conditions, logging batch histories and presenting management information are described.

TL;DR: It is shown in the paper that optimal operation can be found by means of a simple algorithm, in which the startup costs are not taken into consideration and several logical checks performed by an operator.

TL;DR: A file handling system for the efficient storage, transfer and retrieval of data at a high speed and a high frequency in a real time multi-programming environment is described, so users could develop application programs in Fortran without the need to be highly specialized real time programmers.

TL;DR: A multilevel approach to design of a paper machine control system that includes not only regulating and coordinating control, but also on-line optimizing algorithms is presented.

TL;DR: In this paper, the authors describe the initial phases of a project for computer control of the aluminium reduction plant at Sunndalsora, Norway, which was organized as a joint research project between the company, Ardal og Sunndal Verk A/S, and The Engineering Research Foundation at The Technical University of Norway, (SINTEF).

TL;DR: The report deals with the problem of the synthesis of noise proof feature optimization algorithms for the systems with indirect indices distributed check, found by the combination of stochastic approximation methods and sensitivity theory.