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Tel Aviv, Israel

Chen S.-C.,Control Applications
Paper360 | Year: 2010

A multivariable cross direction (CD) or MCD control technique is implemented for controlling sheet weight and fiber orientation profiles. The scheme is capable of taking in multiple profiles such as weight, fiber angles, fiber ratios, and twist index. MCD control coordinates all slice screw movements simultaneously to achieve the best weight and fiber orientation profiles automatically. The top fiber angle is controlled to follow the shape of the bottom fiber angle profile so that the resulting twist is minimized. The scheme is needed to simultaneously control complex sheet properties such as fiber orientation, weight, and moisture. The control scheme has the capability and flexibility to control various combinations of weight, fiber, angles, and twist/curl profiles to achieve selected targets. The application of online fiber orientation and measurement and MCD control results in improvements of fiber orientation and reduced associated paper rejects. Source

Takano M.,Control Applications
Proceedings of the SICE Annual Conference | Year: 2011

This study presents the objectives and practical approaches of the system aspect of control networks from the perspective of the energy efficiency of the demand side. We describe the requirements for the realization of improvements in energy efficiency of both the demand and supply sides, which require connectivity and flexibility of control systems and appropriate energy data formats. © 2011 SICE. Source

Tsanaktsidis C.G.,Control Applications
Chemistry and Technology of Fuels and Oils | Year: 2012

We have studied the effect of the biodegradable polymer TPA (Thermal Polyaspartate Anion) on the acidity of diesel fuel and its blends with biodiesel. We determine the effectiveness of the polymer based on the acid number of the polymer/fuel composition. The results show that the acid number is significantly reduced when the polymer is added, i.e., the quality of the fuel is improved. © 2012 Springer Science+Business Media, Inc. Source

Urresty J.-C.,Polytechnic University of Catalonia | Atashkhooei R.,Polytechnic University of Catalonia | Riba J.-R.,Polytechnic University of Catalonia | Romeral L.,Polytechnic University of Catalonia | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2013

Demagnetization faults have a negative impact on the behavior of permanent-magnet synchronous machines, thus reducing their efficiency, generating torque ripple, mechanical vibrations, and acoustic noise, among others. In this paper, the displacement of the shaft trajectory induced by demagnetization faults is studied. It is proved that such faults may increase considerably the amplitude of the rotor displacement. The direct measure of the shaft trajectory is performed by means of a noncontact self-mixing interferometric sensor. In addition, the new harmonics in the back electromotive force (EMF) and the stator current spectrum arising from the shaft displacement are analyzed by means of finite-element method (FEM) simulations and experimental tests. Since conventional finite-element electromagnetic models are unable to predict the harmonics arising from the shaft trajectory displacement, an improved finite-element model which takes into account the measured trajectory has been developed. It is shown that this improved model allows obtaining more accurate back EMF and stator current spectra than those obtained by means of conventional models. This work presents a comprehensive analysis of the effects generated by demagnetization faults, which may be useful to develop improved fault diagnosis schemes. © 1982-2012 IEEE. Source

Krichen M.,Control Applications
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

We extend our previous work on model-based testing [2]. We propose a formal framework for black-box conformance testing for distributed real-time systems. Our framework is based on the model of partially-observable, non-deterministic timed automata. A given distributed system can be modeled either as a single timed automaton or a network of timed automata. Our algorithm for generating test suites is based on an on-the-fly determinization of the specification automaton. Our testing architecture may be either centralized or not. © 2010 Springer-Verlag. Source

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