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Wyszukujesz frazę "Ramkumar, S." wg kryterium: Autor

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    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
    Artykuł
    Tytuł:
    Effect of Nickel on the Microstructure, Mechanical and Tribological Properties of Austempered Ductile Cast Iron for Steering Knuckle Applications
    Autorzy:
    Ramkumar, T.
    Madhusudhanan, S.
    Rajendran, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/356391.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austempered ductile iron
    fatigue
    impact
    Ni
    surface transition
    wear
    Opis:
    The research article address, the mechanical properties such as fatigue, impact strength and tribological properties of Austempered ductile iron (ADI) has been investigated. The samples of ADI iron were austenitized at 927°C for 2 hrs and later it was under austempering process for 2 hrs at a temperature range of 240°C to 400°C. Experiments under axial loading has been carried out on three different compositions (without Ni(X), 0.22wt.%Ni(X1), 0.34wt.%Ni(X2). Fabricated test bars were converted in to as per ASTM standard samples for different tests. In order to study the influence of chunky nickel morphology studies on fatigue life and impact strength were carried out on a second set of specimens without any microstructural defect. Metallurgical analyses were performed on all the samples of heat treated samples (AF - Ausferrite, MB - Mixed bainite, M - Martensite, RA - Retained Austenite and N - Nodule) were found and compared. It was found that a mean content of 22% of chunky nickel in the microstructure (with respect to total Ni content) influence considerably the fatigue and impact strength properties of the cast iron. Moreover tribological properties of the specimens were also studied under dry sliding conditions at various sliding speed and load. The wear resistance and coefficient of friction were found to increase with increase in load and sliding speed.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 15-25
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Incorporation of Granite and Marble Rejects in Clay Brick Products: Physico-Mechanical Analysis
    Autorzy:
    Dhanapandian, S.
    Manoharan, C.
    Ramkumar, T.
    Gnanavel, B.
    Sutharsan, P.
    Shanthi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535836.pdf
    Data publikacji:
    2010-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.70.Bt
    28.41.Kw
    76.80.+Y
    61.05.C-
    Opis:
    The objective of this work is to characterize and evaluate the effect of incorporation of granite and marble rejects on the properties and microstructure development of three different clay materials used to fabricate brick materials in the brick industry. The raw materials are characterized with respect to their chemical composition by X-ray fluorescence, particle size distribution and mineralogical composition by X-ray diffraction and plasticity. Compositions have been prepared with additions of 0, 10, 20, 30, 40 and 50 wt% reject in three different clay material from Tamilnadu State, India, and fired at temperatures from 500 to 900°C in laboratory furnace. The behaviour of mixtures containing 80 wt% clay material + 20 wt% reject is discussed in detail. The technological properties of briquette specimens such as flexural rupture strength, water absorption, porosity and bulk density were determined. The microstructure of the fired briquette specimens were observed by scanning electron microscopy with energy dispersive X-ray spectrometry, Mössbauer spectroscopy. The results of the above studies show that incorporations of granite and marble rejects up to 50 wt% is potential to the industrial clay brick products, with no major sacrifice on the properties of the final product, anticipating no costly modifications in the industrial production line.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 4; 688-695
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    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
    Artykuł
      Wyświetlanie 1-5 z 5

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