1,741,165 research outputs found
EMC Aspects of Turbulence Heating Observer (THOR) Spacecraft
Get PDFTurbulence Heating ObserveR (THOR) is a spacecraft mission dedicated to the study of plasma turbulence in near-Earth space. The mission is currently under study for implementation as a part of ESA Cosmic Vision program. THOR will involve a single spinning spacecraft equipped with state of the art instruments capable of sensitive measurements of electromagnetic fields and plasma particles. The sensitive electric and magnetic field measurements require that the spacecraft-generated emissions are restricted and strictly controlled; therefore a comprehensive EMC program has been put in place already during the study phase. The THOR study team and a dedicated EMC working group are formulating the mission EMC requirements state of its EMC requirements
NON-LINEAR PARAMETER ESTIMATION OF EMC/ERH CORRELATIONS FOR GRAIN-TYPE PRODUCTS
Get PDFA mathematical prediction of corn sorption isotherm was developed for three-parameter EMC correlation such as Modified-Henderson, Modified-Chung-Pfost, Modified-Oswin, and Modified-Halsey. Moisture sorption experimental data were determined using a dynamic method at temperature 30 oC, 40 oC and water activity range from 0.07 to 0.75. The vapor pressure regulation of air surrounding the grains was adjusted by varying sulfuric acid solution. Non-linear regression algorithms such as Simplex and/or Rosenbrock algorithm were used to fit the measured data to the EMC relations. The generalized correlation coefficient (R2) and the mean relative deviation were in the range of 0.90-0.99 and 2 % - 8 % respectively, in which comparison between predicted and experimental sorption isotherms. From the parameters of correlation, it is possible to get the best equations among them to represent equilibrium moisture content of corn grains. The Modified-Henderson and Modified-Oswin equations give the best model for predicting the adsorption and desorption EMC of corn grain for given range of temperature and water activity
EMC Aspects Of Turbulence Heating Observer (THOR) Spacecraft
No full textTurbulence Heating ObserveR (THOR) is a spacecraft mission dedicated to the study of plasma turbulence in near-Earth space. The mission is currently under study for implementation as a part of ESA Cosmic Vision program. THOR will involve a single spinning spacecraft equipped with state of the art instruments capable of sensitive measurements of electromagnetic fields and plasma particles. The sensitive electric and magnetic field measurements require that the spacecraft-generated emissions are restricted and strictly controlled; therefore a comprehensive EMC program has been put in place already during the study phase. The THOR study team and a dedicated EMC working group are formulating the mission EMC requirements already in the earliest phase of the project to avoid later delays and cost increases related to EMC. This article introduces the THOR mission and reviews the current state of its EMC requirements.</p
EMC oxidation under high temperature aging
No full textEpoxy molding compound (EMC) is widely used for encapsulating automotive electronics. Among all of the components of an electronic package, EMC is most exposed to the atmosphere, and thus undergoes aging. During high-temperature operation, EMC is oxidized, which alters its mechanical properties, and thus can affect the reliability of electronic components. This chapter focuses on four key aspects of EMC oxidation – (1) the growth of EMC oxidation layer, (2) the mechanical properties of oxidized EMC, (3) the effect of oxidized EMC on thermomechanical behavior of a molded package, and (4) the effect of EMC oxidation on solder joint reliability. This study utilizes various experimental characterization techniques as well as finite element simulation-based analysis.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and Material
Analysis of Measuring Apparatus and Techniques for EMC Testing of Conducted and Radiated Emission
No full textreservedAffinché un prodotto elettronico possa circolare liberamente nel mercato europeo, è necessario che esso superi una serie di test per verificare che sia conforme alle norme relative agli aspetti di compatibilità elettromagnetica (EMC). Una delle principali prove di conformità EMC che vengono svolte riguarda le emissioni, ovvero i disturbi elettromagnetici generati dal prodotto e irradiati nell’ambiente circostante. Le emissioni si distinguono in due categorie: emissioni condotte, che si propagano attraverso i cavi di collegamento e di alimentazione, e le emissioni irradiate, che invece si propagano in aria attraverso campi elettromagnetici.
Per ciascun tipo di emissione le norme EMC prevedono una prova di conformità specifica al fine di determinare se le emissioni generate dall’apparecchiatura sotto test superano i limiti di stabiliti dalle norme.
L'obiettivo di questa tesi è quello di presentare ed analizzare gli strumenti e i sistemi di misura principali utilizzati nelle prove EMC di emissione condotta e irradiata.
La tesi è stata suddivisa e sviluppata in tre parti. La prima parte è dedicata ad un’introduzione generale alla disciplina della compatibilità elettromagnetica e serve a fornire il contesto storico e il panorama normativo che caratterizza questa materia. Inoltre, in questa parte vengono introdotte le definizioni e i concetti fondamentali che servono alla comprensione dei capitoli successivi. La seconda parte tratta gli strumenti e le tecniche di misura EMC relative alle emissioni condotte. In particolare sono stati approfonditi il ricevitore EMI (non esclusivo alle prove di emissioni condotte) e la rete di stabilizzazione dell’impedenza di linea (LISN).
La terza parte, invece, tratta gli strumenti e le tecniche di misura EMC relative alle emissioni irradiate, approfondendo in particolar modo le antenne utilizzate in tali prove
EMC Seminar Series 2004, "The World of EMC Standards and their Relationships," 2004 March 9
No full textSlides for the EMC Seminar Series 2004, "The World of EMC Standards and their Relationships." Donald Heirman was featured as an honored guest speaker
EMC compliance for industrial chillers
No full textreservedIn questa tesi, svolta presso l'azienda Schneider Electric - Uniflair, si è analizzato la problematica delle emissioni condotte per quanto riguarda chiller industriali. Si è partiti da uno studio dell'oggetto in prova e del cotesto in cui è inserito; successivamente si è considerata la tematica EMC per comprendere il quadro normativo europeo che disciplina la certificazione di qualsiasi prodotto elettrico/elettronico. Sono state approfondite le norme che vengono considerate per l'esecuzione di prove di emissioni condotte su chiller industriali: EN 61000-6-4; EN 55016-1-1; EN 55016-1-2; EN 55016-2-1. Infine sono stati eseguiti i test sul prodotto da certificare, a cui è seguita una indagine diagnostica per risolvere la non conformità rilevata dal test, che ha portato all'elaborazione di due soluzioni per la riduzione a conformità del chiller
Computational Electromagnetics for EMC Problems of Integrated Circuits
No full textThe computational electromagnetics (CEM) technique has moved from pure mathematical analysis into design in engineering practice, It can provide a much easier and faster solution of prediction in electromagnetic compatibility (EMC) characteristics than conventional methods. This paper presents an overall introduction and applications of CEM for the EMC problems of integrated circuits (ICs). It briefly reviews the literature covering EMC problems existing in ICs. Two applications, which involve dual die central processing unit (CPU) and internal interconnects, are provided in order to prove the capability of the CEM technique in the IC EMC area.Griffith Sciences, Griffith School of EngineeringNo Full Tex
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