A CBT system for system dynamics and controlengineering is presented and an introduction into the related educational aspects, the elements and their realisation is given. The system is based on multimedia web compon...
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作者:
Vukic, Z.Velagic, J.University of Zagreb
Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 ZagrebHR-10000 Croatia University of Sarajevo
Faculty of Electrical Engineering Skenderija 70 SarajevoBH-71000 Bosnia and Herzegovina
In this paper a comparative analysis of Mamdani and Sugeno type fuzzy autopilots for ships is given. Both autopilots have two inputs: the heading signal and the yaw rate signal, and only one output: command rudder ang...
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The paper presents a new procedure for the system identification based on approximation of the plant step responses by PTnTd models. By simple examples, the method application in designing PID controllers is demonstra...
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The control of complex dynamic systems is one of the major tasks of modern control theory. The high dimensionality of complex systems often requires decentralized control concepts. In computer science, multiagent syst...
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The control of complex dynamic systems is one of the major tasks of modern control theory. The high dimensionality of complex systems often requires decentralized control concepts. In computer science, multiagent systems are proposed for use in distributed intelligent applications. To solve the common task, the single agents have to communicate and to interact in a suitable way. In the case of a resource allocation problem, so called market-based control algorithms can be used. Such algorithms imitate the behavior of human economies. Since most research in market-based control is done in the field of communication and computer networks, this work examines the application for the control of complex dynamic systems.
In contrast to other areas of software design, in control applications the concepts of software quality following ISO/IEC 9126 standard are not very common. However, a primary goal in applying formal methods to contro...
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In contrast to other areas of software design, in control applications the concepts of software quality following ISO/IEC 9126 standard are not very common. However, a primary goal in applying formal methods to controller design is the transparency of the resulting algorithm. An algorithm is said to be transparent if it is "easy and clear to see" what the controller does in the moment and what it will do in the next steps. In the paper the relation of this transparency concept to software quality is shown. Yet, the definition of transparency is vague and depends mainly on the subjective opinion on what "easy and clear to see" means. There are several aspects of a control algorithm that can be compared on an objective basis. In the paper the ability of different graphical controller design methods-finite automata, switching interpreted Petri nets (SIPN) and sequential function chart (SFC) according to IEC1131 standard-to describe an algorithm in a transparent way is compared. Furthermore, a number of criteria for transparency are given. These criteria cover different aspects such as number of comments, directionality and I/O-behavior. They are combined in a weighted sum to an automatically computable metric. The results of the presented method are twofold: first a set of rules for transparent controller design in the framework of SIPN and SFC is derived and secondly a metric which allows the comparison of the transparency of different control algorithms is achieved. The first result is interesting for the industrial application of the graphical design methods whereas the second result can be used for educational purposes and for optimization.
Constrained predictive controller that is based on Youla-Kučera (YK) parametrisation of all stabilising controllers is discussed. The optimised variables are not future control increments as usual but directly paramet...
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Friction appears in the bearings and reduction gear of controlled electrical drives and affects the quality of the position, speed or force control. The servosystem performance can be improved by implementation of acc...
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Friction appears in the bearings and reduction gear of controlled electrical drives and affects the quality of the position, speed or force control. The servosystem performance can be improved by implementation of acceleration feedback. For the reason that acceleration measurement is often either not possible or practical, the implementation of acceleration estimation by an observer or differentiation of speed is proposed. Another approach to friction influence compensation is based on the disturbance observer. Its advantage is that it can be applied generally to the estimation of various disturbances. This paper deals with these friction compensation methods which are not based on friction model, but on the compensation of friction as a disturbance. The efficiency of these methods in a servodrive with Stribeck friction is compared by computer simulation and experimentally on a servosystem laboratory model.
A fault detection and isolation scheme for a brushless DC motor driving a mechanical actuation system is presented. First, a detailed mathematical model of the drive is derived. The residual generator is based on pari...
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A fault detection and isolation scheme for a brushless DC motor driving a mechanical actuation system is presented. First, a detailed mathematical model of the drive is derived. The residual generator is based on parity relations while the fault isolation part is implemented by means of the transferable belief model. The problem of distinguishing between faults with the same fault signatures is addressed. It is shown that additional improvements in terms of resolution can be achieved by employing parameter estimation. The proposed FDI scheme is tested on the actual drive under various faults. The achieved performance features the highest resolution, diagnostic stability and accuracy.
This paper present a new effective algorithm for the optimal realization of digital controller structures using the delta operator for sampled data systems subject to Finite-Word-Length (FWL) constraints. The problem ...
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This paper describes an Internet-based learning environment, which uses a standard Web-browser as the user interface. The browser's capabilities are extended to provide a link to CACSD tools to perform symbol and ...
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This paper describes an Internet-based learning environment, which uses a standard Web-browser as the user interface. The browser's capabilities are extended to provide a link to CACSD tools to perform symbol and numerical computations and simulations. The use of object-oriented paradigms in the design of the data structure leads to high flexibility, easy maintenance and short download times. The system is based on Web components which integrate the MATLAB/Simulink/MAPLE V system for calculations in the background. The CACSD tools are completely hidden from the learner who can concentrate on the tutorial, exercises and experiments. The latter are realised in an integrated virtual laboratory, where virtual reality techniques are used to animate virtual laboratory plants and to interact with them.
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