Abstract
In the case of urban rail transport, light vehicles can be an effective solution due to the advantages offered by the elastic wheels. One of the great advantages of these rolling elements is given by the reduction of unsuspended masses of the vehicle which have the effect of reducing the vehicle-rolling interaction forces. However, there are no other advantages to be missed, such as noise reduction (very important for urban vehicles) and improved walking quality. This paper aims at presenting the construction and design elements of the elastic wheels. It is hoped to improve the quality of the urban transport vehicles in Romania. At the same time, dynamic effects will be analysed and presented on the wheel - rail contact, in the case of vehicles equipped with elastic wheels.
Highlights
The paper presents a model for calculating the dynamic loads at the wheel - rail contact
Elastic wheels are used in urban vehicles with low axle loads, especially in subway vehicles
They have to meet the two basic requirements specific to railway vehicles, namely to ensure the safety of the guiding and the quality of the ride, especially since such vehicles fall under the "hard" mode of transport
Summary
The paper presents a model for calculating the dynamic loads at the wheel - rail contact. It shows the advantages of the elastic wheels in terms of dynamic loads and vehicle sounds. Considering the frequency decoupling of the non-suspended masses vibrations to the suspended masses of the vehicle, without making too great errors, the simplified mechanical model of Figure 1 can be used to study the vibrations of the non-suspended masses. Where: η represents the variable depth of the grubbing under the effect of the static loads; Δη - Dynamic additional flexion path; cc - rigidity of the path; mo - mass of the axle; mc reduced track mass (which, in relation to the axle mass, can be neglected)
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