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Miniaturized thermal flow sensors based on thin film technology and Si-micromachining offer air-flow sensitivities in the cm/s range and respond within milliseconds. The descending slope of the sensor characteristic gives sufficient dynamic compression to extend the flow measurement range over five orders of magnitude. With a novel design approach advanced transduction principles become feasible,...
Today communication networks are more and more used to implement distributed applications concerned by closed loop process controls. These applications require a timeliness service in order to guarantee performances (stability, ...). The goal of this paper is, by considering a closed loop process control application with an open loop transfer function of the type G(s)=K/s(1+taus) (both no position...
The IEC 61499 (function block) standard proposes an open architecture for distributed industrial-process measurement and control systems (IPMCS). The IEC 61499 defines the basic concepts and methodology for the design of modular reusable distributable systems, and paves the way for the new reconfigurable and flexible manufacturing. This paper presents the development of a software tool (IEC 61499...
In the present work, an innovative nonlinear controller of nonholonomic mechanical systems, characterized by a dynamic not well known model a priori, using a new neural model obtained by the combination of a Petri net with a neural network is proposed. The performances of the control algorithm are evaluated for tasks of tracking of time trajectories. The study of the stability of the total system...
The paper presents an approach to obtain a closed-loop model of controlled manufacturing systems. The major obstacle in applying such models to formal verification of real systems is the effort that is needed to design a formal model of the plant behavior. We show in this contribution how a semi-formal description of the plant, called pneumatic equipment plan, can be used to reduce the effort to design...
This paper presents an approach to process fault diagnosis (FDI) in nonlinear dynamical systems, based on a bank of neural observers. Each neural observer is tuned to a particular fault and predicts, using its embedded model, the expected values for the sensor readings. The residuals, the difference between the sensor readings and the predicted readings, are used as fault indicators. Each neural observer...
To properly deal with the increasing complexity of industrial distributed and agile manufacturing control systems, the use of methods and tools that support the designer in the definition, implementation and verification of intelligent logic control software is more and more necessary. Nowadays, many different software tools are available to face the rapid prototyping and closed loop simulation based...
Today there is a significant body of results of resource management in real-time systems. However, most of them are based on "open-loop" strategies and techniques that do not take into account application demands to dynamically adjust their behavior. To overcome this problem by focusing on control applications, we show a novel scheduling technique: large error first (LEF). This scheduling...
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