Wszystkie pola: protrusions - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The effect of protrusions on the initiation of partial discharges in XLPE high voltage cables
Autorzy:: AlShaikh Saleh, Mohammad
Refaat, Shady S.
Olesz, Marek
Abu-Rub, Haitham
Guziński, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/2173562.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FEA
finite elements analysis
protrusions
XLPE
water trees
partial discharge
void
space charge
stress enhancement factor
analiza elementów skończonych
kable XLPE
polietylen kablowy
polietylen sieciowany
wyładowanie niezupełne
ładunek przestrzenny
Opis:: This paper is focusing on 3D Finite Elements Analysis (FEA) based modelling of protrusions as defects or imperfections in the XLPE high voltage cable. This study is aiming to examine the impact protrusions have on the initiation of partial discharges. Spherical and ellipsoidal protrusions with different sizes at the conductor screen of the high voltage cable is an essential content of this paper. In addition, a spherical gas-filled void is placed inside and outside the protrusions, and a water tree produced from protrusions is under consideration. The partial discharge influence taking place at the protrusions and the stress enhancement factor is determined for all the variations mentioned to quantify the rise in the inception of partial discharges due to the protrusions.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136037
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:: The effect of protrusions on the initiation of partial discharges in XLPE high voltage cables
Autorzy:: AlShaikh Saleh, Mohammad
Refaat, Shady S.
Olesz, Marek
Abu-Rub, Haitham
Guziński, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/2090691.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FEA
finite elements analysis
protrusions
XLPE
water trees
partial discharge
void
space charge
stress enhancement factor
analiza elementów skończonych
kable XLPE
polietylen kablowy
polietylen sieciowany
wyładowanie niezupełne
ładunek przestrzenny
Opis:: This paper is focusing on 3D Finite Elements Analysis (FEA) based modelling of protrusions as defects or imperfections in the XLPE high voltage cable. This study is aiming to examine the impact protrusions have on the initiation of partial discharges. Spherical and ellipsoidal protrusions with different sizes at the conductor screen of the high voltage cable is an essential content of this paper. In addition, a spherical gas-filled void is placed inside and outside the protrusions, and a water tree produced from protrusions is under consideration. The partial discharge influence taking place at the protrusions and the stress enhancement factor is determined for all the variations mentioned to quantify the rise in the inception of partial discharges due to the protrusions.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136037, 1--9
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:: Różnicowanie warunków przepływu wód współczesnych równi zalewowych na Niżu Polskim na przykładzie doliny środkowej Wisły
Differentiation of groundwater flow conditions in the floodplain areas of the Polish Lowland on the example of the Middle Vistula Valley
Autorzy:: Falkowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/2075390.pdf
Data publikacji:: 2015
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: równie zalewowe
aluwia wodonośne
podłoże aluwiów
floodplain
alluvial aquifer
alluvia basement protrusions
Opis:: Differentiation of groundwater flow conditions within the floodplains of the river valleys in the Polish Lowlands may result from polygenesis of their valleys sections, as well as from the evolution of river systems, which lasts from the end of the Pleistocene. The investigations, which were carried out in the middle Vistula valley showed that important factor for differentiation of groundwater flow conditions within the floodplain could be also the influence of the basement of contemporary alluvia. In the sections where it forms morphological protrusions, the basement affects the flood waters flow which transforms upper part of floodplain lithological profile.
Źródło:: Przegląd Geologiczny; 2015, 63, 10/1; 710--714
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of micro protrusions on the performance of elliptical journal bearings operating with couple stress lubricant
Autorzy:: Abass, Basim Ajeel
Mahdi, Mushrek A.
Powiązania:: https://bibliotekanauki.pl/articles/1840900.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: elliptical journal bearing
hydrodynamic lubrication
micro-protrusions
couple-stress lubricant
non-Newtonian fluids
smarowanie hydrodynamiczne
płyny nienewtonowskie
Opis:: Elliptical bearing is characterized by low induced temperature and high stability at higher speed in comparison with the cylindrical journal bearing. The performance of such bearings can be affected by the type of oil used and its surface properties. The main goal of this work is to study the surface micro protrusion effect on the steady state operation of elliptical journal bearing lubricated with couple stress lubricant. The modified Reynolds’ equation to take into account the effects of couple stress lubricant and micro protrusions of the bearing surfaces is solved using finite difference method. The governing equations were solved using a prepared FORTRAN computer program. Pressure distribution, load carrying capacity and coefficient of friction have been studied for a bearing in laminar flow regime. The mathematical model was validated by comparing pressure results for the elliptical bearing of the present work with that obtained by Hussain et al.(1996). The obtained results demonstrate that the lubricant pressure and the load carried by the bearing decrease for the bearing with higher ellipticity factor while the load carried by the bearing increases for the bearing with higher protrusions or when using a couple stress fluid with higher couple stress variable.
Źródło:: Diagnostyka; 2021, 22, 2; 97-104
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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