The regulation of the heave, pitch and roll motion of a 31 m surface piercing hydrofoil model is investigated using computeraideddesign software. The structure of the suite employed, the options available and the sc...
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ISBN:
(纸本)0080325572
The regulation of the heave, pitch and roll motion of a 31 m surface piercing hydrofoil model is investigated using computeraideddesign software. The structure of the suite employed, the options available and the scope of the software, are outlined together with the evolutionary changes in theoretical development which promoted the distinguishing features of the package. Emphasis is placed upon the flexibility afforded by the approach adopted which has enabled continuous alteration and amendment to be accommodated for over a decade. By way of demonstration, optimal control theory is used to synthesise controllers which minimise a quadratic performance index comprising the weighted sum of the squares of the state and input vectors. Variations on the closed loop system eigenvalues have been computed for changes in the penalty functions to give a family of curves relating the speed of response of the system to the performance index. Comparisons of the results obtained are made with earlier work, based on noninteracting control theory, by selecting coincident closed loop eigenvalues and steady state characteristics. Frequency response representations of these configurations are made.
This paper is concerned with the use of CAD for the education of modern control theory and of digital control. It is pointed out that the theory can only be understood through its use in practice, and the control syst...
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ISBN:
(纸本)0080325572
This paper is concerned with the use of CAD for the education of modern control theory and of digital control. It is pointed out that the theory can only be understood through its use in practice, and the controlsystemdesign of the experimental apparatus is found one of such practices, where the analysis and design of controlsystem should be done by the help of CAD. CAD developed by the authors and the control of experimental apparatus are described.
The paper presents a computer programme package for interactive design and simulation of multidimensional linear and nonlinear variable structure systems. Attention has been paid to utilising variable structure contro...
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ISBN:
(纸本)0080325572
The paper presents a computer programme package for interactive design and simulation of multidimensional linear and nonlinear variable structure systems. Attention has been paid to utilising variable structure control to model-following controlsystems. A recursive reconstruction of inaccessible process states in model-following controlsystems has been discussed.
The present status of use of CAD packages for controlsystems in Japanese industries is surveyed based on two questionnaires. Lists of CAD packages, statistics about applications, and criticisms and expectations of en...
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ISBN:
(纸本)0080325572
The present status of use of CAD packages for controlsystems in Japanese industries is surveyed based on two questionnaires. Lists of CAD packages, statistics about applications, and criticisms and expectations of engineers at industrial practice are reported. Some of recent researches are also introduced.
The paper presents a general-purpose computer-aideddesignsystem for the determination of the optimal design of the industrial, electrical distribution system. A cost-effective structure for such a network is often a...
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ISBN:
(纸本)0080325572
The paper presents a general-purpose computer-aideddesignsystem for the determination of the optimal design of the industrial, electrical distribution system. A cost-effective structure for such a network is often a multilevel, hierarchical structure with one or more voltage levels and several kinds of equipment. It consists of a main supply point, transformer substations and/or switchboards together with supplying lines (which form a 'backbone network') and cable feeders connecting demand points to backbone network (local networks). A distribution planning model is formulated using graph theory and discrete programming. Decisions can be taken on two levels - the first concerns backbone network, the second specifies assignments of demand points to particular elements of the backbone. The model is rather general.
This paper considers the problem of specifying special purpose CAD/CAM systems by presenting a case study which discusses the requirements for software that will be used to aid the design and manufacture of lighting c...
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ISBN:
(纸本)0080325572
This paper considers the problem of specifying special purpose CAD/CAM systems by presenting a case study which discusses the requirements for software that will be used to aid the design and manufacture of lighting columns. While many details of the programs will be unique to this set of problems, much of what is described may have wider applicability for the smaller company or for an organisation with limited knowledge and experience of this technology.
Current work in U. K. is surveyed, on uses of digital computers to aid design of feedback controllers. Most of the work is concerned with methodology but it is all motivated toward practical applications. There are gr...
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ISBN:
(纸本)0080325572
Current work in U. K. is surveyed, on uses of digital computers to aid design of feedback controllers. Most of the work is concerned with methodology but it is all motivated toward practical applications. There are grounds for believing that favourable conditions exist for the methodology now to evolve into engineering practice.
MAX is an interpreted programming language for polynomial matrix manipulations. It contains operations which are frequently needed in linear control. MAX is written using the C programming language under the VAX/VMS o...
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ISBN:
(纸本)0080325572
MAX is an interpreted programming language for polynomial matrix manipulations. It contains operations which are frequently needed in linear control. MAX is written using the C programming language under the VAX/VMS operating system. The design, implementation and available operations of MAX are described.
The conception of the graphic, interactive images used in computerized control rooms cannot be separated from the whole set of data describing the process itself and its controlsystem. We have chosen to integrate an ...
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ISBN:
(纸本)0080325572
The conception of the graphic, interactive images used in computerized control rooms cannot be separated from the whole set of data describing the process itself and its controlsystem. We have chosen to integrate an interactive image designsystem. The software, including the graphic code generation, is realized in the DBMS data manipulation language itself. Such an approach improves the data consistency checking at all the stages of conception. It leads to a more flexible system, as the specifications (representations and interactivity of the different types of objects) can be stored as data in the data-base and easily modified by the designer. The same data-base, used for the CAD system, can also be used for certain kinds of simulations, and later to generate configuration data for the real-time system. The use of general-purpose DBMS in CAD systems leads to flexible tools and is not restricted to interactive image design applications.
A new underground gasification plant is described and a low order dynamic model of the thermal state in the exhaust well is set up. The process being highly nonlinear, the design of the controlsystem, including selec...
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ISBN:
(纸本)0080325572
A new underground gasification plant is described and a low order dynamic model of the thermal state in the exhaust well is set up. The process being highly nonlinear, the design of the controlsystem, including selection of output variables, sensors locations and control laws and parameters, is achieved via computer simulation and trial and error techniques. The computer program for this model will also be implemented in the process computer on-site and it is shown how this program can be used by the process operators, for training or as an aid for controlling the process.
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