Railway transition curves - optimization and assessment

• Autorzy: Zboinski Krzysztof , Woznica Piotr

Identyfikatory

DOI

10.24425/ace.2022.140164

Warianty tytułu

PL

Kolejowe krzywe przejściowe - optymalizacja i ocena

• Języki publikacji: EN

Abstrakty

EN

This article relates to optimization and assessment of railway polynomial transition curves. The search for the optimum shape meant here the evaluation of the transition curve properties based on chosen dynamical quantity and generation of such a curve shape. In the study, 2-axle rail vehicle was used. The rail model represented 2-axle freight car of the average values of parameters. Mathematically understood optimization methods were also applied. As the transition curve, the authors used polynomials of 9th and 11th degrees. As the criterion of the assessment, the integral of change of lateral acceleration along the route was also used. Wide range of the circular arc radii was applied by the authors. The mentioned radii were: 600 m, 900 m, 1200 m, 2000 m and 3000 m. In the work the results of the optimization - types of the curvatures of the optimum transition curves, as well as the vehicle dynamics were presented.

PL

Celem pracy była optymalizacja kolejowych wielomianowych krzywych przejściowych 9. i 11. stopnia z wykorzystaniem nieklasycznego kryterium oceny oraz modelu pojazdu szynowego. Jako wspomniane nieklasyczne kryterium oceny autorzy zastosowali tu minimalizację wartości całki ze zmiany przyspieszenia poprzecznego nadwozia pojazdu po długości drogi. W pracy tej użyto jeden model pojazdu kolejowego. To model 2-osiowego wagonu towarowego o uśrednionych wartościach parametrów, który jest rozważany w stanie ładownym. Prosta konstrukcja pojazdu skutkuje akceptowalnymi czasami obliczeń, co jest korzystne w dużej liczbie optymalizacji. Jego strukturę pokazano na rys. 1c. Jest on uzupełniony o dyskretny pionowo i poprzecznie model toru pokazany na rys. 1a i 1b. W modelu przyjęto liniowość zawieszenia pojazdu - liniowa sztywność i tłumienie elementów zawieszenia pojazdu. To samo zastosowano w modelu toru. Wykorzystany model zawiera wszystkie kluczowe elementy modeli dynamicznych pojazdów szynowych, takie jak: kluczowe elementy masowe (zestawy kołowe i nadwozie pojazdu), elementy zawieszenia (elementy sprężyste i tłumiące), koła i geometrie szyn opisaną przez rzeczywisty, nieliniowy kształt ich profili. Poza tym, styczne siły kontaktowe są obliczane przy użyciu uproszczonej nieliniowej teorii kontaktu J.J. Kalkera. Ponadto, model pojazdu jest uzupełniony modelem toru, co oznacza, że w rzeczywistości rozważany jest układ dynamiczny pojazd-tor. Może on być traktowany jako zaawansowany model dynamiczny, zwłaszcza gdy porówna się go do punktu materialnego reprezentującego pojazd w tradycyjnych metodach oceny i kształtowania krzywych przejściowych.

Słowa kluczowe

EN

railway; transition curve; optimization; railway dynamics; computer simulation

PL

kolej; krzywa przejściowa; optymalizacja; dynamika kolejowa; symulacja komputerowa

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2022
• Tom: Vol. 68, nr 1
• Strony: 207--221
• Opis fizyczny: Bibliogr. 40 poz., il., tab.

Twórcy

autor

Zboinski Krzysztof

• Warsaw University of Technology, Faculty of Transport, Warsaw, Poland

• https://orcid.org/0000-0002-6967-4244

autor

Woznica Piotr

• Warsaw University of Technology, Faculty of Transport, Warsaw, Poland

• https://orcid.org/0000-0002-3715-966X

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).