An integrated approach to process modelling on the basis of knowledge and experience from process engineers is suggested. This approach is designed in such a way that its implementation into an interactive computer pr...
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An integrated approach to process modelling on the basis of knowledge and experience from process engineers is suggested. This approach is designed in such a way that its implementation into an interactive computer program can be applied by process experts who usually have little or no experience in process modelling. 'Integrated' refers firstly to the idea to combine different types of process models into a single process modelling approach and secondly to the envisaged openness of the implementation towards existing computeraidedcontrolsystemdesign (CACSD) environments with respect to data and information exchange.
WCBSL is a Windows Convolution-Based Simulation Language for time-domain analysis and design of linear feedback systems based on convolution algebra The theoretical basis is outlined and the language and methodology a...
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WCBSL is a Windows Convolution-Based Simulation Language for time-domain analysis and design of linear feedback systems based on convolution algebra The theoretical basis is outlined and the language and methodology are illustrated. Characteristic patterns and vectors are defined and the effect of delay is considered-Dynamic criteria for choosing between decentralized and multivariable control are illustrated using the model of an industrial air compressor.
Geometrical and algebraic analysis and design methods for non linear systems require the use of computer-algebra systems to carry out the extensive symbolic calculations. Based on the experience with a MACSYMA program...
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Geometrical and algebraic analysis and design methods for non linear systems require the use of computer-algebra systems to carry out the extensive symbolic calculations. Based on the experience with a MACSYMA program for the analysis and design of nonlinear observers, the new concept of a toolbox for the design of nonlinear controllers using Mathematica is developed. The main focus is on the flatness based design of quasi-static state feedback for nonlinear tracking. The controller design for a nonlinear chemical reactor model illustrates the functionality of the program.
A specialized software package, known as GIFCORCODE, has been developed to aid the designer of rotorcraft flight controlsystems. GIFCORCODE is based on CONSOL-OPTCAD (C-O), a software package that implements a design...
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A specialized software package, known as GIFCORCODE, has been developed to aid the designer of rotorcraft flight controlsystems. GIFCORCODE is based on CONSOL-OPTCAD (C-O), a software package that implements a design methodology based on multicriterion, parametric optimization. GIFCORCODE includes SIMULINK ® and MATLAB ® files for evaluating a design's performance, defined by the Airworthiness design Standard for military rotorcraft (ADS-33C). GIFCORCODE also includes a generalized user interface that allows the designer to interact with C-O by means of pull-down menus and graphical displays. GIFCORCODE has been used in the design of flight controlsystems for the UH-60A RASCAL helicopter.
Hybrid controlsystems are a combination of real-time control law and discrete-state logic. This paper describes how a Development Framework for controlsystems software has been adapted so that it may also handle dis...
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Hybrid controlsystems are a combination of real-time control law and discrete-state logic. This paper describes how a Development Framework for controlsystems software has been adapted so that it may also handle discrete events such as mode switching. The Framework provides a highly automated path from a control engineering specification to a distributed system implementation. Simulink, an extension to Matlab, is used to specify control laws, and a statecharts tool, Statemate, is used to specify and model discrete-state components. The design phase of the Development Framework supports the integration of the two sets of specification. An inverted pendulum controlsystem is introduced as a simple example of a hybrid system implemented using the Framework. The translation of statecharts to dataflow notations is described for the example system. General translation rules are also presented.
Piecewise linear systems describe an important class of nonlinear systems. They are able to bring under one formulation both dynamic systems with piecewise nonlinearities (typically dead-zones and saturation) and logi...
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Piecewise linear systems describe an important class of nonlinear systems. They are able to bring under one formulation both dynamic systems with piecewise nonlinearities (typically dead-zones and saturation) and logic control actions such as found in rule-based controllers and gain schedulers. Recent work has shown that a piecewise linear system can be mapped to a directed graph where information about the interaction of logic and dynamics are preserved. However only low order systems can be studied due to underlying memory restrictions in the analysis method. This paper develops an index method that localises the analysis and suggests a computation framework that opens the way for analysis of medium scale problems.
Mapping is the off-line allocation of the tasks that represent a parallelised algorithm across a multiprocessor architecture. In this paper the target architecture is heterogeneous, where a number of computationaly di...
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Mapping is the off-line allocation of the tasks that represent a parallelised algorithm across a multiprocessor architecture. In this paper the target architecture is heterogeneous, where a number of computationaly disparate processors are integrated within a single network. This paper describes three mapping approaches that attempt to minimise the cycle time of several parallelised algorithms. The mapping algorithms have been embedded into a suite of design tools that allow a rapid translation from an application algorithm to a parallel implementation. These tools are used to explore the efficacy of the mapping algorithms. A simple heuristic is appraised first, followed by an examination of a genetic algorithm (GA) approach. Initially, the GA utilises a simple parallel architecture model. However, this leads to the embedding of the target hardware within the objective function to improve performance. Finally, the effectiveness of these approaches are examined and contrasted.
A CAE (computer-aided-Engineering) hardware and software platform for designing fuzzy controlsystem is presented in this paper. Capable of integrating all the four phases for the design, namely, tuning, simulation, p...
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A CAE (computer-aided-Engineering) hardware and software platform for designing fuzzy controlsystem is presented in this paper. Capable of integrating all the four phases for the design, namely, tuning, simulation, prototyping and field test, the platform allows the whole design process to be cycled easily and efficiently, thus speeds up the controlsystemdesign and prototyping considerably. The hardware architecture of the dedicated standalone controller is discussed. The software development is outlined.
Complex and computationally demanding algorithms are often employed to satisfy the performance requirements of modern controlsystems. Conventional uni-processor and homogeneous parallel architectures can not meet the...
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Complex and computationally demanding algorithms are often employed to satisfy the performance requirements of modern controlsystems. Conventional uni-processor and homogeneous parallel architectures can not meet the performance requirements of these algorithms. A suitable solution maybe obtained with a computationally specialised heterogeneous architecture. This paper introduces the key issues associated with the development of this class of systems. followed by a description of a set of design tools used to automate the development. One of the most challenging aspects of the system development is the scheduling of tasks to processors. This paper will focus closely on this issue by discussing the results of a variety of scheduling heuristics used within the design tools.
In this paper we describe several recent applications of symbolic computation to controlsystemdesign based on MACSYMA. These include routines to calculate the transfer function of a controlsystem in block diagram r...
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In this paper we describe several recent applications of symbolic computation to controlsystemdesign based on MACSYMA. These include routines to calculate the transfer function of a controlsystem in block diagram representation and to compute and simplify state space realizations of multivariable controlsystems. The programs provide a quick way to formulate design problem and automate the calculation in the initial stage of a controlsystemdesign process. An example on the application of these routines in the setting up of generalized plant state space realization for use in H ∞ /H 2 optimial control is provided
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