Several aspects of handling block diagram and signal flow graph representations of systems in a graphical pre-processor for the computer-aideddesign of controlsystems are considered in the paper. Both matrix and rul...
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Several aspects of handling block diagram and signal flow graph representations of systems in a graphical pre-processor for the computer-aideddesign of controlsystems are considered in the paper. Both matrix and rule-based methods for implementing these forms of system representation, and for transforming one form into the other, are described, and it is concluded that the rule-based methods show considerable benefits and promise for future developments, which include an automatic layout tool for post-processing the output of the transformation algorithms.
designing a complex system such as a control, automation or electronic system most engineering activities involve graphical representations for the different design and modelling stages. Starting the design cycle the ...
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designing a complex system such as a control, automation or electronic system most engineering activities involve graphical representations for the different design and modelling stages. Starting the design cycle the structure and function of the system has to be specified. For ease of imagination and decision the difficult interrelations between system components and subfunctions are frequently depicted by graphical schematics and diagrams. In this paper we introduce the idea and basic functions of a general purpose computeraided Schematics (CAS) system that may assist efficiently all schematics-based processes ranging from interactive to completely automatic drawing including the interfaces to further data processing. We discuss the benefits of the CAS approach as rapid generation and updating of correct and consistent graphics and its impact on the whole design and documentation cycle. Furthermore, some of the intricate, mainly graph theoretical optimization problems inherent in the computer generated layout of schematic drawings are addressed. Finally, we outline the possible application of CAS techniques to different engineering disciplines, where graphical programming and documentation of programmable controllers (PC's) is believed to be a profitable domain. First encouraging experience in the automatic documentation of complex control programs is reported.
The next generation of industrial robots will require faster and more accurate control algorithms. Today's robots work with a relatively low speed and are very heavy. Therefore the robots can be regarded as stiff ...
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The next generation of industrial robots will require faster and more accurate control algorithms. Today's robots work with a relatively low speed and are very heavy. Therefore the robots can be regarded as stiff systems - without remarkable deformations. They are controlled mainly by conventional algorithms like (P-, PI-...). In contrast some robots of the future will be light weight constructed to work with higher speed. Elastic deformations have to be included in the control concepts. Development of control concepts for 'advanced' robots requires first accurate but also simple models for the dynamic behaviour of the whole system 'robot'. Based on these models appropriate control algorithms can be tested by simulation. For model development and simplification, for development of control algorithms as well as problems of path planning computeraided methods might be a very efficient tool. The paper deals with problems of computeraided methods for tasks of position control mentioned above as well as other tasks necessary for robot control and some software aspects. As examples research works at the Universities of Linz and Vienna are discussed.
The use of CES, a control Enginering workStation, for educational purposes is described in this paper. The general facilities of CES are described and their application to the analysis, simulation and design of a typi...
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The use of CES, a control Enginering workStation, for educational purposes is described in this paper. The general facilities of CES are described and their application to the analysis, simulation and design of a typical controlsystem in the form of a servomechanism is developed. It is shown that CES provides a natural student-computer interface through which the techniques of block diagram and signal flow graph algebra may be better understood. For linear analysis, symbolic computation may be used directly, while for nonlinearities the linking to software packages for simulation may be more useful. It is concluded that CES has considerable potential for future educational environments.
Universal fuzzy controlsystem has been developed. It is composed of real time controller and support software for CAD of fuzzy expert system. Some practical applications are explained. New practical schemes for adapt...
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Universal fuzzy controlsystem has been developed. It is composed of real time controller and support software for CAD of fuzzy expert system. Some practical applications are explained. New practical schemes for adaptation and multi-layer reasoning are introduced.
During the last few years several knowledge-based systems for computer-aideddesign in controlsystems (CADCS) have been built. This paper surveys some of the CADCS programs which require the coupling of symbolic and ...
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During the last few years several knowledge-based systems for computer-aideddesign in controlsystems (CADCS) have been built. This paper surveys some of the CADCS programs which require the coupling of symbolic and numeric computation, reviews methods used thus far in building these coupled systems, comments on the characteristics that one should require of software tools in order to build coupled systems, reviews several expert systems shells which may be used, and recommends a direction for future efforts. Section 1 introduces the subject. Section 2 surveys several knowledge-based systems for computer-aidedcontrolsystemdesign which require coupling of symbolic and numeric computation. Section 3 comments on capabilities of expert system programming environments for coupled CADCS systems. Section 4 reviews several expert system shells. Section 5 recommends a direction for future efforts and the paper is concluded in Section 6.
A 500 MW unit superheater temperature control loop structure and parameter design using a state-space based CADCS package STAFCON is described. Special control loop structure with disturbance generator model is develo...
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A 500 MW unit superheater temperature control loop structure and parameter design using a state-space based CADCS package STAFCON is described. Special control loop structure with disturbance generator model is developed to increase disturbance compensation capabilities. Simulation results and brief STAFCON system description are also given.
This paper proposes a new algorithm for the decoupling design with additional design aims involved. A reference model which represents the desired closed-loop dynamic response is first used, then a quadratic performan...
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This paper proposes a new algorithm for the decoupling design with additional design aims involved. A reference model which represents the desired closed-loop dynamic response is first used, then a quadratic performance index is introduced to measure both the amount of coupling and the tracking error in the closed-loop system. The control law can be obtained from optimal control technique. This algorithm has been applied on a paper machine headbox using a process controlcomputer. The results under different conditions are obtained.
A large controlsystem CAD package - CCSCAD had been established by cooperative efforts. There are 16 functional subpackages included in the package, which have the functions of time series analysis, system identifica...
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A large controlsystem CAD package - CCSCAD had been established by cooperative efforts. There are 16 functional subpackages included in the package, which have the functions of time series analysis, system identification and parameter estimation, selfadaptive prediction, SISO and MIMO system analysis and synthesis both in time domain and frequency domain methods, systems simulation, SISO and MIMO adaptive control etc. All the functional subpackages and mathematical libraries are dispatched by general management program, and both the interactive dialogue operation mode and macrocommand file operation mode had been implemented. Three computeraided teaching subpackage also had been included. CCSCAD package had been used in a lot of engineering projects.
A-TDS is a CADCS package to design for plants with pure delays. A-TDS consist of a conventional design program for linear controlsystems, simulators of Smith and state predictive controlsystems, and a program for an...
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A-TDS is a CADCS package to design for plants with pure delays. A-TDS consist of a conventional design program for linear controlsystems, simulators of Smith and state predictive controlsystems, and a program for analysis of robust stability. In analysis of robust stability, a new graphical method which was recently developed by the authors is employed . It can give the stability region on the gain-delay change of the controller influences upon robust stability. The system works on a personal computer.
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