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description Publicationkeyboard_double_arrow_right Article , Journal 2020Publisher:MDPI AG Authors:Mariusz Specht;
Mariusz Specht
Mariusz Specht in OpenAIRECezary Specht;
Cezary Specht
Cezary Specht in OpenAIREAndrzej Wilk;
Władysław Koc; +9 AuthorsAndrzej Wilk
Andrzej Wilk in OpenAIREMariusz Specht;
Mariusz Specht
Mariusz Specht in OpenAIRECezary Specht;
Cezary Specht
Cezary Specht in OpenAIREAndrzej Wilk;
Władysław Koc; Leszek Smolarek;Andrzej Wilk
Andrzej Wilk in OpenAIREKrzysztof Czaplewski;
Krzysztof Karwowski;Krzysztof Czaplewski
Krzysztof Czaplewski in OpenAIREPaweł S. Dąbrowski;
Paweł S. Dąbrowski
Paweł S. Dąbrowski in OpenAIREJacek Skibicki;
Jacek Skibicki
Jacek Skibicki in OpenAIREPiotr Chrostowski;
Piotr Chrostowski
Piotr Chrostowski in OpenAIREJacek Szmagliński;
Jacek Szmagliński
Jacek Szmagliński in OpenAIRESławomir Grulkowski;
Sławomir Grulkowski
Sławomir Grulkowski in OpenAIRESławomir Judek;
Sławomir Judek
Sławomir Judek in OpenAIREdoi: 10.3390/en13143646
Mobile Global Navigation Satellite System (GNSS) measurements carried out on the railway consist of using satellite navigation systems to determine the track geometry of a moving railway vehicle on a given route. Their purposes include diagnostics, stocktaking, and design work in railways. The greatest advantage of this method is the ability to perform measurements in a unified and coherent spatial reference system, which effectively enables the combining of design and construction works, as well as their implementation by engineering teams of diverse specialties. In the article, we attempted to assess the impact of using three types of work mode for a GNSS geodetic network [Global Positioning System (GPS), GPS/Global Navigation Satellite System (GLONASS) and GPS/GLONASS/Galileo] on positioning availability at three accuracy levels: 1 cm, 3 cm and 10 cm. This paper presents a mathematical model that enables the calculation of positioning availability at these levels. This model was also applied to the results of the measurement campaign performed by five GNSS geodetic receivers, made by a leading company in the field. Measurements with simultaneous position recording and accuracy assessment were taken separately on the same route for three types of receiver settings: GPS, GPS/GLONASS and GPS/GLONASS/Galileo in an urban area typical of a medium-sized city. The study has shown that applying a two-system solution (GPS/GLONASS) considerably increases the availability of high-precision coordinates compared to a single-system solution (GPS), whereas the measurements with three systems (GPS/GLONASS/Galileo) negligibly increase the availability compared to a two-system solution (GPS/GLONASS).
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13143646&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 12 citations 12 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13143646&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2020Publisher:MDPI AG Authors:Piotr Dworakowski;
Piotr Dworakowski
Piotr Dworakowski in OpenAIREAndrzej Wilk;
Andrzej Wilk
Andrzej Wilk in OpenAIREMichal Michna;
Bruno Lefebvre; +2 AuthorsMichal Michna
Michal Michna in OpenAIREPiotr Dworakowski;
Piotr Dworakowski
Piotr Dworakowski in OpenAIREAndrzej Wilk;
Andrzej Wilk
Andrzej Wilk in OpenAIREMichal Michna;
Bruno Lefebvre;Michal Michna
Michal Michna in OpenAIREFabien Sixdenier;
Michel Mermet-Guyennet;Fabien Sixdenier
Fabien Sixdenier in OpenAIREdoi: 10.3390/en13061352
The magnetizing inductance of the medium frequency transformer (MFT) impacts the performance of the isolated dc-dc power converters. The ferrite material is considered for high power transformers but it requires an assembly of type “I” cores resulting in a multi air gap structure of the magnetic core. The authors claim that the multiple air gaps are randomly distributed and that the average air gap length is unpredictable at the industrial design stage. As a consequence, the required effective magnetic permeability and the magnetizing inductance are difficult to achieve within reasonable error margins. This article presents the measurements of the equivalent B(H) and the equivalent magnetic permeability of two three-phase MFT prototypes. The measured equivalent B(H) is used in an FEM simulation and compared against a no load test of a 100 kW isolated dc-dc converter showing a good fit within a 10% error. Further analysis leads to the demonstration that the equivalent magnetic permeability and the average air gap length are nonlinear functions of the number of air gaps. The proposed exponential scaling function enables rapid estimation of the magnetizing inductance based on the ferrite material datasheet only.
Hyper Article en Lig... arrow_drop_down add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13061352&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 10 citations 10 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Hyper Article en Lig... arrow_drop_down add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13061352&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu