Wyniki wyszukiwania - BazTech

1

Freight car model with Y25 bogies stability analysis

Dusza Mirosław

Pojazdy Szynowe

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2023

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Nr 3-4

1--24

EN

Y25 (25Tn) bogies have been used in freight cars for over 50 years. It is a proven design with a positive opinion in many European countries. In addition to the generally positive opinion about the operational properties of the Y25 bogies, there are sometimes publications whose authors notice certain imperfections related mainly to the so-called running instability, resulting in derailment under certain motion conditions. This paper presents results simulation of motion tests of a freight car with Y25 bogies. A freight car model was created using the VI-Rail software. The research focus on determining the critical velocity and examining nature of the model solutions in the overcritical velocity range. Straight track as well as curved track motion is analysed. Empty and full wagon properties are considered. Impact of changes the suspension system selected parameters values on vehicle model solutions stability as well as the vehicle impact on track was analysed.

2

The track condition in the view of legal provisions vs. safety of freight car operating on standard Y25 bogies

Sobaś M.

Pojazdy Szynowe

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2018

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Nr 3

25--34

EN

The paper presents current regulations relating to track maintenance and their impact on running safety and dynamic properties of freight wagons. Selected issues related to the above mentioned problems are examined in national and foreign regulations (UIC cards and PN-EN European standards). The track parameters required by particular regulations are compared to each other. The problems of track maintenance become particularly significant in the case of the railway infrastructure separated in its organizational terms from the structure of individual railway management boards.

PL

W artykule przedstawiono aktualnie obowiązujące przepisy dotyczące utrzymania toru i ich wpływ na bezpieczeństwo jazdy oraz własności dynamiczne wagonów towarowych. W przepisach krajowych oraz zagranicznych (karty UIC oraz normy europejskie PN-EN) przeanalizowano wybrane zagadnienia, które wiążą się z ww. problematyką. Zaprezentowano porównania wymaganych parametrów toru ww. przepisach. Zagadnienia związane z utrzymaniem toru nabierają szczególnego znaczenia w przypadku, kiedy infrastruktura kolejowa jest wyodrębniona pod względem organizacyjnym ze struktury poszczególnych zarządów kolejowych.

3

An innovative method for stress analysis of Y25 bogie under oscillating loads due to tank wagon fluid sloshing

Rezvani M. A., Feizi M. M., Shadfar M

Journal of Theoretical and Applied Mechanics

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2014

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Vol. 52 nr 3

745--755

EN

Freight wagons carry higher axle loads and may travel along tracks of lower quality. This can be interpreted as higher dynamic loading of freight bogies especially for tanker cars that are subjected to sloshing loading. Rail irregularities, particularly during braking and running on curved tracks initiate the fluid sloshing. This article is about introducing an innovative method for analyzing bogie stresses of tanker cars while in travel and under critical circumstances. The effect of the vehicle speed of travel, its liquid filling ratio, track quality and fluid density are also investigated in terms of stress results of bogies.