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D'Angelo G.,Fiat Research Center
29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings | Year: 2010

For quality assurance in the manufacture of automotive parts, the integrity of the laser-beam welds joining steel parts must be monitored. A considerable number of on-line inspection systems have being developed to improve weld quality. Traditional monitoring systems are realized through wired systems, formed by communication cables and sensors. These systems suffer from two main drawbacks: a) the sensor cables are easily damaged and conflict with ease of installation and retrofit into industrial plants, b) the installation and maintenance of the sensors cables is much more expensive than the cost of the sensors themselves. Integration of electronics, sensors, wireless communications, has prompted monitoring folks to consider alternatives that reduce wiring costs, make connections not feasible previously, and retrofit more measurement points cost effectively as well. This paper presents a prototype sensing device to achieve wireless and powerless operation for implementing a monitoring laser welding system. The weld monitor is designed to be simple, low cost, and able to withstand a harsh manufacturing environment. Source

Papazoglou M.P.,University of Tilburg | Van Den Heuvel W.-J.,University of Tilburg | Mascolo J.E.,Fiat Research Center
IEEE Software | Year: 2015

Smart manufacturing networks describe a production chain as a marketplace that delivers products on demand. In this chain, partners collaborate in product work routings that connect dispersed service-enabled systems with resources, materials, human expertise, and operation-equipment combinations. Researchers have developed a reference architecture for developing a highly connected, knowledge-enabled manufacturing network that decentralizes production control. This network will enable collaborative manufacturing of new products and response to product demand, allowing for greater production flexibility and product variability. © 2015 IEEE. Source

Millo F.,Polytechnic University of Turin | Luisi S.,Polytechnic University of Turin | Borean F.,Fiat Research Center | Stroppiana A.,Fiat Research Center
Fuel | Year: 2014

In this paper a new intake port configuration has been designed, analyzed by means of 3D CFD simulation and experimentally tested on a turbocharged Spark Ignition (SI) engine, with the aim of addressing the issue of the poor in-cylinder turbulence levels which are typical of the Early-Intake-Valve- Closing (EIVC) strategies adopted in Variable Valve Actuation (VVA) systems at part load to reduce pumping losses. The proposed intake port layout promotes turbulence by increasing the tumble motion at low valve lifts in order to achieve a proper flame propagation speed at part load. The new layout was proved to have a significant and positive effect in improving the EGR tolerance and in shortening the combustion process, especially at the lower loads, which are the more critical for VVA systems using an EIVC strategy. However, under full load operating conditions the new design (which enhances the tumble motion at the low valve lifts used at part load, but decreases the tumble intensity under the full lift operation used at full load) did not reach the performance targets, since the knock mitigation was not sufficient to compensate for the loss in combustion efficiency due to the slower combustion. The proposed solution could therefore be exploited only if a reduction of the engine full load performance is allowed in view of the significant benefits during part load operation. Finally, the calculated in cylinder flow characteristics were related to the experimental combustion durations, identifying, on a quantitative basis, the relationship between the turbulent kinetic energy and the burning process durations, and thus providing guidelines for further possible modifications of the engine geometry aimed to achieve a suitable combustion speed over the whole engine operating map. © 2013 Elsevier Ltd. All rights reserved. Source

Pruna A.,Polytechnic University of Bucharest | Pruna A.,Fiat Research Center | Pruna A.,Polytechnic University of Valencia | Branzoi F.,Institute of Physical Chemistry
Journal of Polymer Research | Year: 2012

Poly(o-phenylenediamine) (PoPD) nanotube electrodes were obtained by templated electropolymerization employing anodic porous alumina membrane. Infrared Spectroscopy measurements confirmed the polymerization of oPD into the alumina templates. The electrochemical activity of the PoPD nanotube electrodes were assessed by cyclic voltammetry (CV) as a function of monomer concentration. The morphology of the obtained nanostructures was assessed by scanning electron microscopy measurements. The results showed that poly(o-phenylenediamine) nanotube arrays have uniform diameter and they match the aspect ratio of the anodic porous membrane used for the synthesis. A high filling factor of the polymer within the alumina template was also revealed. The CV studies showed that the electrochemical properties of the PoPD nanotubes are greatly influenced by the monomer concentration in the synthesis electrolyte. © 2012 Springer Science+Business Media B.V. Source

Pruna A.,Fiat Research Center | Pruna A.,Polytechnic University of Bucharest | Pruna A.,Polytechnic University of Valencia | Pullini D.,Fiat Research Center | Mataix D.B.,Universidad Politecnica de Ingenieria
Journal of the Electrochemical Society | Year: 2012

Single-crystal ZnO nanowires long up to several microns were fabricated by one-step electrochemical deposition. A template-based process employing track-etched polycarbonate (TE-PC) membranes was used for this purpose. The morphology and the structure characteristics of the ZnO nanowires were analyzed by means of Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM), and Selected Area Electron Diffraction (SAED). The growth process conditions turned out to have a marked influence on the crystal nature and morphology of the nanowires. Deposition rates ranging from 0.4 nm s -1 and up to 0.6 nm s -1 were recorded for the growth of ZnO nanowires. The obtained results showed that by using carefully controlled deposition conditions single crystalline nanowires and fine-grained structures can be routinely obtained. © 2012 The Electrochemical Society. Source

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