A description is given of a set of benchmarks assembled to evaluate computer-aidedcontrolsystemdesign packages. The two sets of problems consisted of one set of three continuous models and one set of two sampled-da...
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A description is given of a set of benchmarks assembled to evaluate computer-aidedcontrolsystemdesign packages. The two sets of problems consisted of one set of three continuous models and one set of two sampled-data models. Each set displayed a hierarchy of increasing complexity.
The representation of systems in system theory and in computer-aidedcontrol engineering is considered. Different ways to represent systems are discussed, and an approach based on object-oriented programming, which ad...
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The representation of systems in system theory and in computer-aidedcontrol engineering is considered. Different ways to represent systems are discussed, and an approach based on object-oriented programming, which admits hierarchical descriptions of system structure and behavior, is suggested. A prototype implementation of the concepts is described together with experiences using it.
The paper outlines the capabilities of the Sussex University Nonlinear Software. The programs based on two theoretical techniques, the describing function and Tsypkin's method, evaluate limit cycle solutions in bo...
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ISBN:
(纸本)0080325572
The paper outlines the capabilities of the Sussex University Nonlinear Software. The programs based on two theoretical techniques, the describing function and Tsypkin's method, evaluate limit cycle solutions in both continuous and discrete feedback systems. The software allows the display of solution waveforms at the input to each nonlinearity and an exact orbital stability criterion, for continuous systems, is used for the limit cycles predicted by the Tsypkin method. Most of the software is for fixed structure canonical feedback systems although one of the DF based programs allows analysis of systems of a free structure. The software may also be used for frequency domain design where gain and phase margins of compensation schemes may be calculated by finding the minimum amount of additional gain or time delay required for a system to limit cycle.
A program system dedicated to the simulation and balancing of energy and material balances in a sugar factory has been developed. Special concern has been put in the development of a flexible and comprehensible user i...
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ISBN:
(纸本)0080325572
A program system dedicated to the simulation and balancing of energy and material balances in a sugar factory has been developed. Special concern has been put in the development of a flexible and comprehensible user interface which can be adjusted according to the needs of the individual user. The calculation part of the programme uses a modified version of the sequential modular approach where the calculation path, within the process calculation modules, can be changed. This approach has shown to facilitate the determination of calculation sequence and iteration parameters in the flowsheet. The factory programme includes a method for balancing material balances with redundant plant data and a method for graphical presentation of the flowsheet and calculation results.
Process and automation systemdesign sets demands on the design database. A relational database system is a general and natural way to represent design data. However, a relational system is not necessarily an optimal ...
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ISBN:
(纸本)0080325572
Process and automation systemdesign sets demands on the design database. A relational database system is a general and natural way to represent design data. However, a relational system is not necessarily an optimal way because a large designsystem contains information which has complex structures and dependencies and is modified continuously during the design process. An experimental database system for process automation design has been implemented using VAX11/750/VMS. The programming language has been Pascal. The database system has, instead of relations, six basic entities: objects, object types, connections, connection types, procedures and requirements, and certain relationships between these. The system has been applied to some power plant processes. Descriptions of processes, subprocesses, components and control algorithms have been stored into the database. Various functional and other requirements on the subsystems of the plant are stored into the database so that, for example, the following kinds of questions can be answered: 'which requirements should component xx satisfy', 'to which subsystems of the plant is requirement R123 connected', 'in which plant functions is component C234 used'. The purpose of the developed system is twofold. First, the plant and automation system descriptions are in such a form that the requirements can be connected to the right places in the descriptions. Second, the system is a framework by which various computerized design tools can be integrated and the information transfer between them managed.
A productive model is developed for data interchange and direct software interaction among CAE tools by examining histories of the design process from the project manager's viewpoint. design project summaries from...
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A productive model is developed for data interchange and direct software interaction among CAE tools by examining histories of the design process from the project manager's viewpoint. design project summaries from flight control, satellite control, robot control, and engine identification are discussed that illustrate the engineer's expectations for intuitive operation, the need to work with popular software packages such as NASTRAN and ACSL, the importance of working with the languages Ada, C, FORTRAN, and LISP, and the requirement to interact with the host computer operation system software.
An information management system, CAEBEL, for use in controlsystem studies, is described. The discussion covers the concept goals, the logical structures generated in the pursuit of those goals, some specific capabil...
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An information management system, CAEBEL, for use in controlsystem studies, is described. The discussion covers the concept goals, the logical structures generated in the pursuit of those goals, some specific capabilities to be incorporated in the system, and the present capabilities of the system.
The classic optimal control problem of the linear quadratic (LQ) regulator using state feedback is considered for the situation in which there are two or more decision-makers controlling the underlying dynamic system....
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The classic optimal control problem of the linear quadratic (LQ) regulator using state feedback is considered for the situation in which there are two or more decision-makers controlling the underlying dynamic system. The numerical aspects of iterating two coupled discrete-time Riccati equations that arise in this case is studied. An efficient algorithm is produced that is integrated into the L-A-S language package for computer-aidedcontrolsystemdesign.
Interaction vector displays were presented as a means of indicating frequency dependent interactions in linear multivariable systems by the superposition of interaction vectors onto an inverse Nyquist array. The vecto...
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ISBN:
(纸本)0080325572
Interaction vector displays were presented as a means of indicating frequency dependent interactions in linear multivariable systems by the superposition of interaction vectors onto an inverse Nyquist array. The vectors can also be defined for a Nyquist array and show how each element q//i//i (jw) of the open loop frequency response is modified to h//i (jw) when all loops are closed except loop i. It has been shown how the interaction vectors, or approximations to them, are modified by compensation. Uncertainties in the frequency response of the system model are considered by surrounding each frequency evaluation of the uncompensated g//i//k (jw) by an uncertainty circle in which the true g//i//k (jw) must be. It is shown how each approximation interaction vector can then be represented by a nominal vector surrounded by an offset circular bound. The designer can thereby assess the effects of uncertainties at all stages of the interactive design of compensation. The approach is illustrated with examples from the literature.
The problem of controlling highly nonlinear servo systems subject to severe disturbances is addressed. The objective is to apply modern controlsystems theory to control and to enhance armored vehicle fire control. Th...
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The problem of controlling highly nonlinear servo systems subject to severe disturbances is addressed. The objective is to apply modern controlsystems theory to control and to enhance armored vehicle fire control. The focus is on the development and evaluation, through computer-aidedcontrolsystemdesign simulation studies, of a digital controller using optimal feedback control as a replacement for conventional analog classical control of an armored vehicle's main weapon and sight systems.
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