This paper introduces the development of CAD techniques for controlsystems in China. A general description has been made about the industrial applications of CAD packages for controlsystems. Some examples have been ...
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ISBN:
(纸本)0080325572
This paper introduces the development of CAD techniques for controlsystems in China. A general description has been made about the industrial applications of CAD packages for controlsystems. Some examples have been illustrated about MIMO discrete-time systems, LQG systems, SISO controlsystems, self-tuning controlsystems and adaptive prediction systems. Some prospect ideas have been described in conclusion.
The paper describes an application of a robust controller design method for calculating the parameters of a controller for a multivariable hard-coal preparation process. The parameters are optimized via a sequential d...
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ISBN:
(纸本)0080325572
The paper describes an application of a robust controller design method for calculating the parameters of a controller for a multivariable hard-coal preparation process. The parameters are optimized via a sequential design method in the frequency domain, based on a combination of the Horowitz/Sidi design (1972), Mayne's (1973) sequential design and Steinhauser/Kreisselmeier's (1979) vector performance criterion method. The design was carried out using a sophisticated CAD-program. The paper shows how the parameters are calculated with this CAD-method and discusses the simulated control results. The simulation is compared with the measured results at the plant after implementation of the designed controller on a process computer AEG 80/30 with a real time software control package ARSI.
An interactive design support system 'INDEED' for industrial sequence control is developed at an engineering workstation. The main features of the system are a user-friendly man-machine interface, a timed Petr...
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ISBN:
(纸本)0080325572
An interactive design support system 'INDEED' for industrial sequence control is developed at an engineering workstation. The main features of the system are a user-friendly man-machine interface, a timed Petri net based simulator and an intelligent verifier for the design modification. An integrated graphic editor/simulator is operated by a menu and a mouse. After a controller is designed as a logic diagram with the editor, a simulation can be carried out on the same logic diagram and a timing chart appears upon the diagram by means of a multi-window system. The timed Petri nets based simulator converts the logic diagram into a timed Petri net. The whole system is simulated. The properties of Petri nets, such as liveness, conflict and reachability, can be used for analyzing and improving the design. As a design is often carried out by the modification of an old design, a verifier for the design modification is developed. The verifier extracts different portions of the timed Petri nets of these designs and converts them into automata, and the detected difference is shown as state-transition maps.
CODE (control DEfinition language) is a formal language designed and used for implementation of control strategies in sequence control applications, such as found in industrial control. CODE treats processes as finite...
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ISBN:
(纸本)0080325572
CODE (control DEfinition language) is a formal language designed and used for implementation of control strategies in sequence control applications, such as found in industrial control. CODE treats processes as finite state machines (FSM), by defining transition conditions that determine when a state change will occur, and the consequent transition action. A control definition consists of a hierarchical model, each layer of which consists of a number of FSMs. The CODE concept is proposed for use in a formal specification language that would form part of a specification work bench, including syntax-checking editors, consistency and completeness checks, automatic simulation and documentation systems. This work bench will provide a powerful tool for specification and development of process control and other systems. It will help increase the effectiveness of software designers and engineers;it will also contribute to increased formality in system specification, helping to eliminate a major source of error. The CODE concept is thus part of the current trend towards increased automation of software development.
The basic theory for analysis and synthesis of differential systems using polynomial matrix representation is considered. Concepts like controllability, observability, stability, etc. are defined and methods based on ...
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ISBN:
(纸本)0080325572
The basic theory for analysis and synthesis of differential systems using polynomial matrix representation is considered. Concepts like controllability, observability, stability, etc. are defined and methods based on elementary row operations for checking them are given. As an example of synthesis methods an algorithm for synthesis of observers is given. computeraideddesign of multivariable controlsystems is performed interactively using a program which enables manipulation of polynomial matrices, and a simulation program that uses polynomial matrices as models of differential systems. The program for manipulation of polynomial matrices performs row operations and other transformations, calculates determinants and their roots. Synthesis problems can also be considered by studying different regulator compositions, constructing estimators and feedback compensators. The simulation program communicates with the manipulation program by means of polynomial matrices stored in files. Simulation results are presented by graphic displays or by separate plotter and design decisions can be based on these results. The use of the CAD package is demonstrated by considering an observer synthesis problem.
The aim of this discussion is to point out what kind of standardization can be made to CACSD software and how can this be realized. Standardization in the following areas is addressed: 1. Programming languages 2. Simu...
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ISBN:
(纸本)0080325572
The aim of this discussion is to point out what kind of standardization can be made to CACSD software and how can this be realized. Standardization in the following areas is addressed: 1. Programming languages 2. Simulation languages 3. General purpose operating systems 4. Graphical software 5. Modelling and design data bases 6. User interfaces 7. Data format standardization 8. Interfaces to numerical algorithms.
This project deals with the man-machine interface and its applications to control problems. The objective was a program which allows the user to define any physical system, like heat exchangers or turbines, in an effi...
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ISBN:
(纸本)0080325572
This project deals with the man-machine interface and its applications to control problems. The objective was a program which allows the user to define any physical system, like heat exchangers or turbines, in an efficient and simple way for simulation. systems defined by a block diagram can efficiently be entered by use of a special CAD program. This efficiency results in using graphic symbols instead of differential equations. With an initial menu, predefined elements can be chosen and are placed by a cursor to compose the system. Another menu containing a selection of functions is used to give each element its functional meaning. There is no need for typing in differential equations and a clear documentation is produced by the computer. The two-dimensional block diagram is then transformed into a one-dimensional instruction sequence controlling the simulation. Different systems can be stored as permanent files for reuse or modification. Various stored systems can be freely combined to form a new one. An extended version of the program package is able to do real time simulation and process control.
control and performance optimization of modern manufacturing systems is characterized by an increasing degree of complexity that accompanies automation and flexibility. Because the functional relationship between typi...
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ISBN:
(纸本)0080325572
control and performance optimization of modern manufacturing systems is characterized by an increasing degree of complexity that accompanies automation and flexibility. Because the functional relationship between typical performance measures and parameters of interest generally cannot be determined, analytic (queueing) models are only of limited help. Detailed analysis requires extensive simulation, an approach limited by its high, sometimes prohibitive, computational cost and infeasible when real-time decisions must be made. An alternative is offered by perturbation analysis, a technique which efficiently estimates performance gradients with respect to parameters from a single interval of observing real on-line data. This technique can be used to exploit the data collection capabilities of computer integrated manufacturing systems and automatically provide valuable 'sensitivity' information. It essentially creates a decision aid whose uniqueness lies in supplying on-line answers to 'what if. . . ' questions. An application of perturbation analysis is discussed, where emphasis is placed on optimizing control strategies for dynamic scheduling and routing of individual parts in a computer integrated manufacturing system.
A workstation design based on the software package KEDDC and an Intel 310/RMX microcomputersystem is given. The portable workstation provides an interactive environment for online system identification, control syste...
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A workstation design based on the software package KEDDC and an Intel 310/RMX microcomputersystem is given. The portable workstation provides an interactive environment for online system identification, controlsystemdesign, simulation, and immediate implementation of real-time control algorithms. The achievable sampling rates are determined for a range of state-feedback control laws. The real-time workstation is used to develop and demonstrate candidate control algorithms for a ground-based experimental structure emulating the dynamics of a large flexible spacecraft.
Traditionally, two different classes of computer programs have served control engineers as tools for systems-modeling: nonlinear simulation packages and linear computer-aidedcontrolsystemdesign programs. It is show...
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Traditionally, two different classes of computer programs have served control engineers as tools for systems-modeling: nonlinear simulation packages and linear computer-aidedcontrolsystemdesign programs. It is shown how nonlinear modeling and simulation facilities have been incorporated within the IMPACT linear control environment. A detailed example illustrates the flexibility of this system for dealing with systems having mixed linear and nonlinear components.
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