1,721,161 research outputs found
Accumulo Elettrochimico nei mezzi di trasporto
No full textL’articolo motiva la necessità
crescente di disporre di
sistemi di accumulo elettrochimico
in combinazione con
l’utilizzo di mezzi di trasporto
e descrive le principali
tecnologie utilizzate o proposte
e i parametri caratteristici
che ne consentono
un confront
Uso di gruppi geotermoelettrici e turbogas dotati di dispositivi statici con accumulo nella riaccensione del sitema elettrico ENEL
No full textThe Electromagnetics Foundation of Circuits Revisited
Full text linkIt is as pillar of electromagnetics knowledge that the Maxwell’s equations describe in a very comprehensive way all electromagnetic phenomena and therefore can be in principle be used as the mathematical basis for any analysis involving systems subject to these phenomena.
In normal research and engineering practice, however, such systems are very often modeled as “circuits”, whose behavior is described by Kirchhoff’s laws instead of Maxwell’s. All physicists and electrical engineers profoundly know that the two equation sets are equivalent, but, in author’s knowledge, no systematic effort has made to evaluate and make explicit the relationship between them.
This paper tries to fill this knowledge gap, and to draw a clear link between the electromagnetism foundation (Maxwell’s equations) and the circuital approac
Modeling and Simulation of AC Railway Electric Supply Lines Including Ground Return
Full text linkToday's ac railway feeding systems are composed by several conductors with various connections to each other. The return current is shared between rails, ground wires connected to rails, ground; current flows to ground are determined by rail-to-ground distributed conductance. This paper gives formulas to deal with all these complexities, both for power quality and power-frequency studies, integrating and combining previous studies which cover only part of them. Especially new in this paper is a technique to include in the computation currents dispersed into soil through ballast. It also illustrates a way to implement easily all the proposed formulas using a specific, open and flexible simulation language, the Modelica language. An application of the proposed formulas and related simplifications is illustrated
Sistemi di Accumulo elettrochimico all’interno dei mezzi di trasporto
No full textL’articolo descrive rapidamente le ragioni che portano alla necessità di disporre di sistemi di accumulo elettrochimico nei mezzi di trasporto, per l’alimentazione sia dei carichi ausiliari che dell’eventuale carico elettrico costituito dal sistema propulsivo; e come queste necessità siano andate incrementandosi in anni recenti.
Esso descrive poi le principali tecnologie utilizzate o proposte per la realizzazione di questo tipo di accumulo, ed i parametri caratteristici che ne consentono un confronto
MC's PlotXY—A general-purpose plotting and post-processing open-source tool
No full textMC's PlotXY, in the following just called PlotXY, is a free piece of software able to make line plots and bar charts from data deriving from measuring devices or simulation programs using several formats. It allows to visualize and post-process these data without the need to have on the target computer the original software that generated it. It was written from the ground-up having researchers and scientists in mind, and therefore is optimized for speed, clarity, soundness. Its special characteristic distinguishing it from the large base of existing plotting software is its flexibility: using this small piece of software, the user can do plotting and post-processing activities on the results obtained from other sources (simulation software or measuring devices) without having these sources installed on the computer where post-processing is made. Moreover, it allows reading file formats rarely available on non-specific software, such as ATP, Comtrade, LabView formats. Although the support of some of these formats is not complete, being the software open-source, anyone can contribute to expanding them, operating on just a single cpp file. It is developed using the Qt platform, which allows good GUI design, and already available for Windows, Macintosh, and Linux systems. This paper describes the software characteristics and some programming techniques used to develop it
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