Different system identification methods have been applied to determine ship steering dynamics from full-scale experiments. The techniques used include output error, maximum likelihood and more general prediction error...
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Different system identification methods have been applied to determine ship steering dynamics from full-scale experiments. The techniques used include output error, maximum likelihood and more general prediction error methods. Different model structures have been investigated ranging from input-output models in difference equation form to the equations of motion in their natural form. Effects of disturbances, errors and dynamics in sensors and actuators have been considered. Programs for interactive system identification have been used extensively. The experiments have been performed both under open loop and closed loop conditions. Both linear and nonlinear models have been considered. The paper summarizes the experiences obtained from applying system identification methods to many different ships. The results have been applied both to investigate steering properties and to design autopilots for ship steering. Insight into ship steering dynamics and identification methodology has been obtained.
The implementation of a class of self-tuning controllers using a portable microcomputer system is described. The self-tuning control theory is shown to provide a variety of control objectives such as model-reference, ...
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The implementation of a class of self-tuning controllers using a portable microcomputer system is described. The self-tuning control theory is shown to provide a variety of control objectives such as model-reference, optimal Smith prediction and the minimization of a general k -step-ahead cost-function. Hardware and software details of the portable computer, SESAME, are presented with particular reference to the use of a new high-level language, control Basic. Studies of the application of self-tuning to the control of room-temperature, acid neutralization, and batch chemical reactors in industry are outlined.
Experiments that have been realized in a digital computercontrol laboratory are described in this paper. A set of 17 experiments that are used in undergraduate and graduate laboratory assignments as well as in resear...
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Experiments that have been realized in a digital computercontrol laboratory are described in this paper. A set of 17 experiments that are used in undergraduate and graduate laboratory assignments as well as in research are briefly described. Three experiments, namely a coin exchanging machine, an inverted pendulum and the tension and speed control system in a tare transporting mechanism are then presented in some detail. The experience that has been obtained from running the laboratory for many years is summarized.
A microprocessor-based device to measure active and reactive power in a three-phase system is described in this paper. The algorithm is based on the Fourier series technique. The design of the hardware and software, a...
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A microprocessor-based device to measure active and reactive power in a three-phase system is described in this paper. The algorithm is based on the Fourier series technique. The design of the hardware and software, and construction of the device are described. Two microprocessors and a digital hardware multiplier have been used to meet the computational time requirements of real-time operation. A comparison of the results of static and dynamic tests on this device and an analog measuring device show that the digital device is fast, stable and accurate.
A simulation model of evaluating deployment strategies for fire engines is introduced in this paper. Expected burned-area was adopted as a criterion. This simulation model was implemented by using the data of Kyoto Ci...
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A simulation model of evaluating deployment strategies for fire engines is introduced in this paper. Expected burned-area was adopted as a criterion. This simulation model was implemented by using the data of Kyoto City. First this simulation model is demonstrated to be valid by comparing the results derived by executing simulations on this model with the actual data of Kyoto City in five years (1974 - 1973). Then, three alternative strategies are compared by this model. From these results, it becomes clear that about 30% reduction of burned-area in one year is expected by an alternative deployment strategy which will be feasible by introducing the computer-aided command and control system of fire engines.
作者：
N. OhashiT. ItohEngineering Division
Mitsubishikasei Techno-engineering Ltd. 2-1-30 Shiba Minatoku Tokyo Japan Engineering Department
Mitsubishi Chemical Industries Ltd. (Kurosaki Works) Kurosaki Yahata Nishi Ku Kita Kyushu Fukuoka Prefecture Japan
Conventional analog instruments fail to achieve a satisfactory automatic control system for an automated batch system in which transient states are encountered and frequent alterations of type and/or grade vary the na...
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Conventional analog instruments fail to achieve a satisfactory automatic control system for an automated batch system in which transient states are encountered and frequent alterations of type and/or grade vary the nature of the operations. The authors obtained even better results than expected by employing a distributed computer system in batch control. This paper presents the related hard-and software details together with an outline description of the type and/or grade control system, improved controlability, countermeasures against erroneous operations, and results given by the new system.
Recently, many people have realized that digital training simulators are very useful and economical for power plant operation training. They have been rapidly improved with the progress of computer technology, since t...
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Recently, many people have realized that digital training simulators are very useful and economical for power plant operation training. They have been rapidly improved with the progress of computer technology, since the first digital simulator was installed more than ten years ago. A digital training simulator for Eraring coal-fired power plant was developed on the basis of the most up-to-date computer technology. Attention was paid to saving computation time to obtain a sufficiently realistic simulator with-in the limitation of computer hardware and to providing extensive and easy-to-handle instructor functions for training. In particular, coal-firing relaLed models were elaborately developed.
An industrial two-stage grinding circuit was prepared for the application of multivariable control. The aim was to control the plant in terms of important variables relating to particle size and circulating load. The ...
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An industrial two-stage grinding circuit was prepared for the application of multivariable control. The aim was to control the plant in terms of important variables relating to particle size and circulating load. The instrumentation in the plant was upgraded to give a comprehensive set of measurements of high accuracy. A dynamic controller, designed by INA methods, was obtained and applied to the plant. The on-line tuning of the controller was relatively simple, but careful attention had to be paid to the selection of setpoints that were within the capability of the plant. The control system was stable and operated satisfactorily. An economic evaluation of the controller was made. The results indicated that the control system is an economic proposition for the gold mine at which this investigation took place.
control engineers are faced with problems of increasing difficulty, due to the growing complexity of our technical installations and to the concern for environmental and related Problems. This should be taken into con...
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control engineers are faced with problems of increasing difficulty, due to the growing complexity of our technical installations and to the concern for environmental and related Problems. This should be taken into consideration in the educational process. Several courses in the graduate control program have for this reason been taught in a grourpteachinor project-oriented way since 1976. Seven different courses that have been offered are described in this paper. Examples are: Solar Energy Heating Systems control, Machine Tool Position control, Identification. The experience that has been gained from these courses is summarized. The inclusion of such courses in control programs is advocated.
The paper investigates adaptive control of discrete-time processes satisfying first-order linear difference equations with random coefficients which may be constant or time-varying. Structural relationships between su...
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The paper investigates adaptive control of discrete-time processes satisfying first-order linear difference equations with random coefficients which may be constant or time-varying. Structural relationships between sub-optimal adaptive control laws are discussed and results of systematic Monte-Carlo simulations are reported. These lead to a comparison of two sub-optimal adaptive controls ( ‘ optimal -k- step-ahead ’ and ‘self-tuning’) and to conclusions about the need for and effectiveness of adaptive control of the systems simulated. It is conjectured that the results and the classification scheme they suggest might have more general validity.
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