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Wyszukujesz frazę "moving chord" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Analysis of the Effectiveness of Determining the Horizontal Curvature of a Track Axis Using a Moving Chord
Autorzy:
Koc, Władysław
Powiązania:
https://bibliotekanauki.pl/articles/2091262.pdf
Data publikacji:
2021
Wydawca:
Instytut Kolejnictwa
Tematy:
railway
horizontal curvature
moving chord
analysis
methodology
Opis:
The paper addresses the issue of determining the horizontal curvature of a railway track, noting that it is most often done indirectly – on the basis of measured sags from a chord stretched along the track. Further use of this method would not be justified if there were a direct method for determining the curvature. Therefore, the assumptions of the method for deter-mining the horizontal curvature from “Archives of Civil Engineering”, iss. 4/2020, are presented. This method is based on changes in the slope angles of the moving chord in the Cartesian coordinate system. Two important details are examined: the influence of the length of the chord on the obtained values of curvature and the possibility of determining the location of border points between particular geometrical elements. The analysed variants resulted from the type of transition curves used. It has been found that the length of the chord does not play a significant role in determining the curvature and does not limit the application of this method. At the same time, attention is drawn to the precision of determining the nature of the curvature and its compliance with the theoretical course on transition curves. The analysis shows that, in the moving chord method, it is possible to determine the location of the border points between the individual geometrical elements, but the required chord length must be adapted to the type of transition curve.
Źródło:
Problemy Kolejnictwa; 2021, 190; 77--86
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Effectiveness of Determining the Horizontal Curvature of a Track Axis Using a Moving Chord
Autorzy:
Koc, Władysław
Powiązania:
https://bibliotekanauki.pl/articles/2091317.pdf
Data publikacji:
2021
Wydawca:
Instytut Kolejnictwa
Tematy:
railway
horizontal curvature
moving chord
analysis
methodology
Opis:
The paper addresses the issue of determining the horizontal curvature of a railway track, noting that it is most often done indirectly – on the basis of measured sags from a chord stretched along the track. Further use of this method would not be justified if there were a direct method for determining the curvature. Therefore, the assumptions of the method for determining the horizontal curvature from “Archives of Civil Engineering”, iss. 4/2020, are presented. This method is based on changes in the slope angles of the moving chord in the Cartesian coordinate system. Two important details are examined: the influence of the length of the chord on the obtained values of curvature and the possibility of determining the location of border points between particular geometrical elements. The analysed variants resulted from the type of transition curves used. It has been found that the length of the chord does not play a significant role in determining the curvature and does not limit the application of this method. At the same time, attention is drawn to the precision of determining the nature of the curvature and its compliance with the theoretical course on transition curves. The analysis shows that, in the moving chord method, it is possible to determine the location of the border points between the individual geometrical elements, but the required chord length must be adapted to the type of transition curve.
Źródło:
Problemy Kolejnictwa; 2021, 190; 77--86
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Moving Chord Length for Determining the Curvature of In-Service Railway Track
Autorzy:
Koc, Władysław
Powiązania:
https://bibliotekanauki.pl/articles/2203233.pdf
Data publikacji:
2022
Wydawca:
Instytut Kolejnictwa
Tematy:
railway track
curvature of the track axis
the moving chord method
applications
Opis:
The paper deals with the still unexplained issue of the choice of chord length, which will be the most benefi cial when determining the horizontal curvature of railway track with the use of the moving chord method. In the railway track – with an incorrect choice of the chord length – the horizontal track deformations and coordinate measurement error may cause irregular curvature diagrams, which will be difficult to interpret. The study analysed three test geometric layouts adapted to the speeds of 80 km/h, 120 km/h and 160 km/h (the radii of circular curves determined as a result of the curvature estimation performed were approximately 410 m, 880 m and 1480 m, respectively). The lengths of the moving chord in the range of 10÷50 m were considered. On the basis of the conducted analysis, it was unequivocally demonstrated that the chord length used to determine the curvature in the railway track should depend on the value of the radius of the circular curve. Approximate lengths lc were proposed depending on the range of the RCA radius. The adaptation of the moving chord method to the adopted measurement procedure presented in this paper and the way of using the obtained curvature diagram, provide the appropriate application basics.
Źródło:
Problemy Kolejnictwa; 2022, 197; 147--160
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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