Autor: Ramkumar, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Positive output elementary Luo converter for fixed-frequency ZVS operation
Autorzy:: Bright, S. J. V.
Ramkumar, S.
Anand, H.
Powiązania:: https://bibliotekanauki.pl/articles/200011.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fixed-frequency ZVS
positive output elementary Luo converter
POELC
zero-voltage switching-pulse width modulation
ZVS-PWM
konwerter Luo
ZVS
Opis:: Luo converter is one amid the developed DC-DC converters offering higher voltage gain. Soft-switching techniques, like zero-voltage switching (ZVS), repress switching losses, and hence the system efficiency and the life of the power semiconductor switches are improved. Incorporation of soft switching in fixed-frequency operation of the Luo converters may persuade them in the regulated power supply applications. The existing variable switching frequency solution suffers from a number of problems viz. complexity in filter designing, more electromagnetic interference (EMI), etc. This paper proposes a positive output elementary Luo converter (POELC) involving ZVS with the wherewithal of working in fixed frequency. A comprehensive discussion on the proposed circuit topology is detailed with both simulation and experimental studies. Systematic descriptions of basic POELC, variable-frequency ZVS-POELC, and fixed-frequency ZVS-POELC make an impact on the understanding of related concepts by the researchers in this field.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 255-262
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Tribological behavior, mechanical properties and microstructure of Al-12Si-ZrC composite prepared by powder metallurgy
Autorzy:: John, C. F.
Paul, R. C.
Singh, S. C. E.
Ramkumar, T.
Powiązania:: https://bibliotekanauki.pl/articles/201910.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: wear
friction
aluminium
silicon
zirconium carbides
powder metallurgy
tarcie
krzem
węgliki cyrkonu
metalurgia proszków
Opis:: High-energy mechanical alloying method was used to prepare Al-12Si-xZrC (x = 0, 5, 10, 15 wt. %) nanocomposites. Cylindrical preforms were prepared with an initial preform density of 89% by using a suitable die and punch assembly. The preforms were sintered in a muffle furnace with an inert gas atmosphere at a temperature of 550°C, followed by cooling until room temperature has been attained. Scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques were used to characterize the composites. Pin-on-disc wear testing machine was used to determine the tribological properties of the prepared composites. The results show that the wear loss reduced with increasing the reinforcement content and coefficient of friction increases gradually.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 149-154
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media
Autorzy:: John, C. F.
Paul, R. C.
Singh, S. C. E.
Jacobjose, J.
Ramkumar, T.
Hikku, G. S.
Sharma, R. K.
Sengottuvel, P.
Powiązania:: https://bibliotekanauki.pl/articles/200059.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Si-ZrC composites
powder metallurgy
weight loss method
corrosion rate
SEM
kompozyty Al-Si-ZrC
metalurgia proszków
metoda redukcji masy
szybkość korozji
Opis:: This paper aims to investigate the corrosion behavior of zirconium carbide (ZrC) reinforced Al – Si metal matrix composites (MMCs) in a mixture of acidic solution using weight loss method. The composites are prepared by powder metallurgy method. Al-12Si-xZrC composites containing 0, 5, and 10 weight percentage of ZrC particles are compacted in a die set assembly and sintered in an inert gas muffle furnace. The acidic solutions used for corrosion are 1 N HCl, 1 N H₂SO₄ and 1 N HNO₃. The corrosion characteristics of Al-12Si-xZrC composites and the pure Al were experimentally evaluated. The corrosion test was carried out at different weight proportions of the samples in various concentrations of the acid such as 1 N HCl, 1 N H₂SO₄ and 1 N HNO₃ for different exposure time (i.e., 24 h, 72 h, 144 h and 216 h), respectively. The results specified that corrosion rate of composites was lower than that of base metal Al under the corrosive atmosphere, regardless of exposure time and acidic solutions used as corrodents. Al-12Si-xZrC composites become more corrosion resistant as the ZrC content is increased. This is because of the development of stable oxide layer above the specimens. Scanning electron microscopy (SEM) confirms the degree of attack of acidic solution on the surface of the examined material.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 9-16
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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