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Possibilities of improving a rail vehicle running safety with independently rotating wheels

Mikhailov Evgeny, Semenov Stanislav, Shvornikova Hanna, Dižo Ján, Blatnický Miroslav, Droździel Paweł, Kravchenko Kateryna

Zeszyty Naukowe. Transport / Politechnika Śląska

2022

z. 115

93--106

This work is focused on the possible ways of improving the running safety of a railway vehicle, which uses IRWs (independently rotating wheels) in a bogie. It discusses the main positive and negative properties of an application of IRWs for a railway vehicle while it is running in a curve. There are evaluated running properties of a railway vehicle in terms of safety for IRWs and a standard wheelset (SW). It is assumed that a wheelset design with IRWs will reduce the risk of derailment of a railway vehicle in a curve with a smaller radius because it will be reached a more favourable distribution of decisive forces in the wheel/rail contact. A designed wheelset with IRWs differs from other IRWs designs; in this case, only a flange can rotate independently from a wheel treat surface about the axis of rotation. Further, this research presents an analysis of a friction forces distribution of the friction forces in a contact of a flange and a rail head and a comparison with an SW. The obtained results allow concluding that it is advisable to use the wheels with the perspective wheel design (including independently rotating) to reduce the resistance to movement and improve the running properties of a railway vehicle for safety.

Strength analysis of an off-road lorry frame

Dižo Ján, Blatnický Miroslav, Droździel Pawel, Semenov Stanislav, Mikhailov Evgeniy, Kurtulík Jakub

Zeszyty Naukowe. Transport / Politechnika Śląska

2021

z. 110

23--33

The lorry frame is the main carrying part of a lorry, composed of several components. These components are connected by joints into one structural unit and it forms the lorry chassis. The contribution of this article is focused on thestrength analyses of a backbone frame, which is used on an off-road lorry chassis. Strength analyses are carried out utilising the finite element method. This article presents a created three-dimensional model of the frame and definition of boundary conditions (loads, the definition of degrees of freedom) needed for simulation computations. Results of the numerical calculations are the main parts of this article. Attention is mainly centred on the distribution of stresses of the frame under defined loads and its deformations.