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Wyszukujesz frazę "railway ballast" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
A new high-efficiency procedure for aggregate gradation determination of the railway ballast by means image recognition method
Autorzy:
Guerrieri, M.
Parla, G.
Powiązania:
https://bibliotekanauki.pl/articles/231252.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
balast kolejowy
kruszywo
analiza obrazu
segmentacja
uziarnienie kruszywa
railway ballast
aggregate
image analysis
segmentation
aggregate gradation
Opis:
The mechanical characteristics of the railway superstructure are related to the properties of the ballast, and especially to the particle size distribution of its grains. Under the constant stress-strain of carriages, the ballast can deteriorate over time, and consequently it should properly be monitored for safety reasons. The equipment which currently monitors the railway superstructure (like the Italian diagnostic train Archimede) do not make any “quantitative” evaluation of the ballast. The aim of this paper is therefore to propose a new methodology for extracting railway ballast particle size distribution by means of the image processing technique. The procedure has been tested on a regularly operating Italian railway line and the results have been compared with those obtained from laboratory experiments, thus assessing how effective is the methodology which could potentially be implemented also in diagnostic trains in the near future.
Źródło:
Archives of Civil Engineering; 2013, 59, 4; 469-482
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A laboratory study of pressure distribution and residual settlements in wide grading double layer railway ballast under long-term cyclic loading
Autorzy:
Sysyn, M.
Gerber, U.
Nabochenko, O.
Dehne, S.
Powiązania:
https://bibliotekanauki.pl/articles/1849767.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
podsypka kolejowa
podsypka dwuwarstwowa
zachowanie
obciążenie długotrwałe
obciążenie cykliczne
osiadanie
ciśnienie
rozkład ciśnienia
railway ballast
long-term behaviour
permanent settlement
ballast grading
pressure
pressure distribution
Opis:
Ballast layer has weighty share in the lifecycle costs of railway track. The strict standards and maintenance rules of ballast grading significantly contribute to the ballast costs. One ways to the costs reduction is differential demands to ballast grading for the secondary and low loaded railway lines. Additional one is the different ballast grading over the ballast height. This study presents a full scale laboratory investigation of technical efficiency of such railway ballast under the long-term cyclic loading in comparison with the standard ballast layer. The double layer is presented with standard grading ballast upper layer and bottom sub ballast layer consists of ballast mixture. Pressure distribution under the ballast layer and permanent settlements of the layers are measured during the loading cycles. The reference measurements with standard grading ballast material are carried out. The study shows that initial settlement accumulation of the double layer railway ballast are lower to that of the standard ballast layer. However, the settlements accumulation intensity of the ballast is higher. The analysis of the pressure distribution measurements under the ballast layer and the settlements inside the ballast layer explain the causes of the different settlement accumulation.
Źródło:
Archives of Civil Engineering; 2020, 66, 4; 561-578
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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