A minimax approach for multi-objective controller design is proposed, ill which structured uncertainty is characterized by multiple discrete-time SISO models. Typical engineering objectives are optimized for all model...
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A minimax approach for multi-objective controller design is proposed, ill which structured uncertainty is characterized by multiple discrete-time SISO models. Typical engineering objectives are optimized for all models, such as bounds on different sensitivity functions and time-domain responses. The approach is illustrated by improving the best performing controller of a flexible arm benchmark example.
New results and innovative procedures are presented to design nonlinear robust controllers for a class of nonlinear time-varying systems with uncertain parameters and control constraints. The straightforward technique...
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New results and innovative procedures are presented to design nonlinear robust controllers for a class of nonlinear time-varying systems with uncertain parameters and control constraints. The straightforward techniques for designing the robust bounded controllers are developed by utilizing the theoretical foundations of the Hamilton-Jacobi theory and Lyapunov's method. The major contribution is the development of feasible and computationally efficient algorithms to stabilize uncertain nonlinear systems. Various aspects of recent developments concerning robust control and nonlinear optimization are discussed and further researched. Necessary and sufficient conditions for optimality and robust stability are studied. By applying robust design, this paper allows one to solve practical problems in nonlinear robust control and optimization by using nonlinear models with parameter variations and input bounds. To overcome the gap between the theory and its application, two examples are thoroughly studied. Robust control of the third-order chaotic attractor with uncertain parameters is performed to illustrate the efficiency of the proposed procedures. In addition, the goal of this article is to demonstrate the feasibility of the developed concept for multivariable flight control, and a bounded controller is designed for the F-18 fighter. This robust algorithm is synthesized by using the coupled nonlinear aerodynamics for the longitudinal and lateral.
most of the medium and small scale power plants in china are operating with the poor economic performance and reliability because of the poor automation system. it is a good method to use the intelligent digital contr...
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most of the medium and small scale power plants in china are operating with the poor economic performance and reliability because of the poor automation system. it is a good method to use the intelligent digital controller to reform the automatic control and instrument system of these power plants. this article summaries the application of a kind of intelligent controller in the control of the steam temperature of a boiler. the controlled process is analysed first and then a control strategy is designed to obtain good control performance, the control program is given also. about one year stable operation of this control system proves that the design of this system is successful.
For the replacement of old sequential controllers for plants to modern programmable controllers(PCs), we have developed the sequential control programs automatic inductive regeneration method (SPAIR) system from input...
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For the replacement of old sequential controllers for plants to modern programmable controllers(PCs), we have developed the sequential control programs automatic inductive regeneration method (SPAIR) system from input-output signals and action specifications of a target controller. However, this method cannot regenerate the logic included in the interior coils. Therefore, we propose an efficient inference method of interior coils logic for SPAIR using Logic Part Attaching Algorithm. In this method, the target logic of the interior coil is acquired by the selective attachment of logic parts. We confirmed the effectiveness through the application of this method to some original controllers including interior logics.
The high voltage and electromagnetic field environment poses a big challenge to a control system for plasma immersion ion implantation (PIII). The automation process must be immune to electric field interference produ...
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The high voltage and electromagnetic field environment poses a big challenge to a control system for plasma immersion ion implantation (PIII). The automation process must be immune to electric field interference produced by the high voltage power supply, modulator, radio-frequency or microwave plasma generator, MEVVA plasma sources, and so oil. We have recently designed and installed a distributed control system, PIIIDCS, to automate the operation of our PIII facility. programmable logic controllers are used as the held control stations because of their good anti-interference ability and good real time response. A DH-485 network is used as the communication link between the field controllers and the management station in order to improve the robustness and reliability of the system. The newly developed interface is designed to work in a graphic mode in Microsoft Windows 95. Test runs have shown that the system is reliable, flexible, and easy to operate. The development of this novel control system will expedite the development of commercial PIII instrumentation. (C) 1998 American Institute of Physics.
We propose that the domain of a Domain-Specific Language (DSL) can be characterised by: 1. the class of environments in which systems developed in the language are expected to operate;and 2. the class of properties wh...
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We propose that the domain of a Domain-Specific Language (DSL) can be characterised by: 1. the class of environments in which systems developed in the language are expected to operate;and 2. the class of properties which such systems are expected to possess. The design of DSLs should therefore include the development of a proof system that eases the task of proving the properties in the class identified for the anticipated operating environments. We develop these ideas in the context of industrial computing systems by presenting a semantics and proof system for a language based on IEC 1131-3, the international standard programming language for programmable controllers. Of particular significance in this example is the use of a diagrammatic representation and the development of a proof system for a class of invariance properties that requires only local knowledge of the structure of diagrams.
The problem of validating the specification of the control software of a simplified chemical reactor, expressed in the Sequential Function Chart(SFC) notation, is addressed in this work. Through this case study it is ...
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The problem of validating the specification of the control software of a simplified chemical reactor, expressed in the Sequential Function Chart(SFC) notation, is addressed in this work. Through this case study it is demonstrated a way of converting the SFC description to that of a Hybrid Automata System(HAS) and validating properties of the described system by integrating already available results in the theol)' of Hybrid Automata. Then, by synchronizing this HAS description with a HAS model of the controlled process and applying an algorithmic solution to the reachability problem of the combined HAS descriptions, it becomes possible to infer the satisfaction of the system properties that the equivalent SFC specifies.
The paper deals with the problems of process control and control engineering education in Kaunas University of Technology. The trends of process automation and control strategies are presented. The structure of traini...
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The paper deals with the problems of process control and control engineering education in Kaunas University of Technology. The trends of process automation and control strategies are presented. The structure of training centers and problems of education are described. Control and automation based on newest EDI technologies are discussed. Necessity to establish Control Engineering Education Center is investigated.
The FPO micro programmable controller (PLC) from Aromat Corp. is featured. Features of the microPLC include floating point math;two-axis positioning with pulse or pulse width modulation output to 10kHz;four high-speed...
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The FPO micro programmable controller (PLC) from Aromat Corp. is featured. Features of the microPLC include floating point math;two-axis positioning with pulse or pulse width modulation output to 10kHz;four high-speed counters;trapezoidal motion profile;5K words of program memory;seven hardware interrupts;and 0.9 microsec/step scan rate. One unique programming feature of the PLC is the ability to edit the program while it is executing. Contact information and price are given.
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