This paper deals with the fault-tolerant control problem under nonlinear boiler systems with noise and disturbance. MCMBPC (Multivariable Constrained Model-Based Predictive controller) proposed by Wilkinson et al . is...
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This paper deals with the fault-tolerant control problem under nonlinear boiler systems with noise and disturbance. MCMBPC (Multivariable Constrained Model-Based Predictive controller) proposed by Wilkinson et al . is used and modified in this paper in order to be applied to nonlinear boiler systems. Fault-tolerant control scheme combining MCMBPC with a fault detection method based on the unknown input observer is proposed. The fault-tolerant controller proposed is shown, via simulation, to have acceptable tracking performance even under some faults of input valves in the boiler system.
controller design for Flexible Manufacturing Systems (FMS) is addressed within a systems theory-basea framework, which allows the separation of the workcell (comprised of machines and resources to be controlled), and ...
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controller design for Flexible Manufacturing Systems (FMS) is addressed within a systems theory-basea framework, which allows the separation of the workcell (comprised of machines and resources to be controlled), and the controller (consisting of the decision-making scheduler). This point of view is particularly profitable for teaching FMS design to controlengineering students, who are familiar with the feedback control principles. The design algorithm uses standard manufacturing engineering tools to produce a rule-based controller that is described mathematically in terms of matrix equations, yielding the Petri net and max/plus representations of the closed-loop FMS. This matrix approach is exploited to develop a MATLAB software which implements new functions for idempotent calculus in the semiring (R∪{-∞},max,+), and offers a large flexibility in changing the operating conditions and design specifications.
Safety of closed-loop drug infusion systems is an issue often raised as a matter of concern. As a result, many closed-loop control systems are reported in the literature merely as computer simulation studies and few e...
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Safety of closed-loop drug infusion systems is an issue often raised as a matter of concern. As a result, many closed-loop control systems are reported in the literature merely as computer simulation studies and few ever reach the stage of physical realisation and formal clinical evaluation. We address the safety issues involved with such systems by describing the development of a portable closed-loop control system for atracurium-induced muscle relaxation. This is a safety-critical system particularly when applied to brain and eye surgery where movement could have serious deleterious effects. The benefits of closed-loop muscle relaxation in providing stable surgical operating conditions over a wide range of patient sensitivities while infusing the minimum amount of drug makes this a worthwhile aim and serves to demonstrate safety issues which are generally applicable to other closed-loop drug infusion systems. It is hoped that the described methodology will facilitate and encourage the clinical application of closed-loop drug infusion systems so that clinical staff and patients may receive the benefits of closed-loop drug therapy.
This paper is addressed at the difficulty of accurately modelling a two-flexible-link manipulator system, which is a necessary pre-requisite for future work developing a high-performance controller for such manipulato...
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This paper is addressed at the difficulty of accurately modelling a two-flexible-link manipulator system, which is a necessary pre-requisite for future work developing a high-performance controller for such manipulators. Recent work concerned with the development of an accurate single-flexible-link model is first reviewed and then the expansion of a single-link model into a two-flexible-link system in a way which properly takes into account the coupling and interactions between the two links is discussed. The method of approach taken is to calculate the elastic and rigid motions of the links separately and then to combine these according to the principle of superposition. The application of the model developed is demonstrated in a simulated two-flexible-link system.
Hybrid control systems are a combination of real-time control law and discrete-state logic. This paper describes how a Development Framework for control systems software has been adapted so that it may also handle dis...
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Hybrid control systems are a combination of real-time control law and discrete-state logic. This paper describes how a Development Framework for control systems software has been adapted so that it may also handle discrete events such as mode switching. The Framework provides a highly automated path from a controlengineering specification to a distributed system implementation. Simulink, an extension to Matlab, is used to specify control laws, and a statecharts tool, Statemate, is used to specify and model discrete-state components. The design phase of the Development Framework supports the integration of the two sets of specification. An inverted pendulum control system is introduced as a simple example of a hybrid system implemented using the Framework. The translation of statecharts to dataflow notations is described for the example system. General translation rules are also presented.
Formal verification of safety and timing properties of engineering systems is only meaningful if based on models which are systematically derived. In this paper we report on our experience using switched bond graphs f...
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This paper discusses a class of uncertain composite systems composed of several similar subsystems interconnected with an external system in a circulant fashion. An effective quadratic stability criterion and a design...
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This paper discusses a class of uncertain composite systems composed of several similar subsystems interconnected with an external system in a circulant fashion. An effective quadratic stability criterion and a design procedure of the quadratic stabilization for such a system are given in terms of some modified subsystems with lower-order. Based on the Riccati-like equation approach, a decentralized control design procedure for the class of systems is presented. As an application, a sufficient condition for solvability of the simultaneous stabilization problem for a collection of linear systems is derived.
作者：
H.-M. HanischS. KölbelM. RauschUni Magdeburg
Dept. of Electrical Engineering Institute of Automatic Control PO Box 4120 D-39016 Magedeburg Germany ☎ +49391/67-127 47 Fax: +49391/67-122 29
The paper presents a framework for modelbased synthesis of discrete controllers and automatic generation of control code. We use a special representation of Condition/Event systems for design of models of the uncontro...
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The paper presents a framework for modelbased synthesis of discrete controllers and automatic generation of control code. We use a special representation of Condition/Event systems for design of models of the uncontrolled behaviour of the plant. Formal controller synthesis is performed for specification in terms of forbidden states and desired sequences. The synthesized controller is automatically transformed into a language following the IEC 1131 and is executable.
The paper describes the use of Prolog in the implementation of a Knowledge-based Environment for Modelling and Simulation (KEMS). The basis of the implementation is the AI frame paradigm which provides a conceptual fo...
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The paper describes the use of Prolog in the implementation of a Knowledge-based Environment for Modelling and Simulation (KEMS). The basis of the implementation is the AI frame paradigm which provides a conceptual foundation for the design of the model base, the simulation code generator and the knowledge acquisition module which are the Prolog-based components of KEMS. The experiences derived from KEMS provide a springboard from which the wider applications of logic programming in controlengineering are discussed. Six application areas are identified, including modelling, the design of front-ends for CAD packages, the design of object-oriented databases, the prototyping of engineering concepts, knowledge-based control and the design of decision-support systems.
Considers state estimation based on observations which are simultaneously corrupted by a deterministic amplitude-bounded unknown bias and a possibly unbounded random process. This problem is solved by developing a com...
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Considers state estimation based on observations which are simultaneously corrupted by a deterministic amplitude-bounded unknown bias and a possibly unbounded random process. This problem is solved by developing a combined set theoretic and Bayesian recursive estimator. It provides a continuous transition between both concepts in that it converges to a set theoretic estimator when the stochastic error vanishes and to a Bayesian estimator when the deterministic error vanishes. In the mixed noise case, the new estimator supplies solution sets defined by bounds that are uncertain in a statistical sense.
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