Theory and Practice of Determining the Dynamic Performance of Traction Rolling Stock

Abstract

In the interaction of the rolling stock and the upper structure of the railway track, intense dynamic loads occur. They have a destructive effect both on the parts of the rolling stock and on the elements of the superstructure of the track. In order to develop a durable, rational and reliably functioning design of cars and locomotives with good dynamic properties and good indicators of the impact of rolling stock on the railway track, along with theoretical computational studies, experimental studies are also required, which are usually the final stage in the design and implementation of rolling stock or the modernization of existing ones, such as locomotives and wagons, in order to improve their strength and dynamic performance. This article presents the results of field tests to determine the dynamic performance of the type CKD6e diesel locomotive. The description of the preparation of the CKD6e shunting locomotive for testing is given. An analysis of the dynamic performance of a diesel locomotive during the passage of turnouts, on a straight section of the track and in a curve with a radius of 400 m, was carried out. The studies performed showed that the minimum value of the stability factor against wheel derailment on a straight section of the track is significantly higher than the standard value. The experimentally obtained ratio of frame forces to the static load from the wheelset on the rails, the coefficients of vertical dynamics of the first and the second stages of suspension and the coefficient of stability against derailment of the wheel from the rail were registered on the track section in a curve with a radius of 400 m meet the current requirements. A calculation scheme and equations of vertical oscillations are proposed, an analysis is carried out according to the graphs of movements of bogies and a locomotive body when moving along irregularities of different lengths at different speeds.

An Estimation of the Energy Savings of a Mainline Diesel Locomotive Equipped with an Energy Storage Device

“…Modeling is important in creating modern equipment for vehicles [31,32] and rail transport systems in general [32][33][34]. Mathematical modeling is widely used, in particular, for the study of rolling stock [35][36][37], traction power supply systems [38][39][40], infrastructure objects [41][42][43], traffic safety assessment [44,45], transportation process management [46], etc. The priority is mathematical modeling that does not require the production of physical prototypes of equipment and systems.…”

Novel ‘Closed’-System Approach for Monitoring the Technical Condition of Railway Tracks

“…A single system of change in force and geometrical parameters in time can be designed with a certain combination of measuring systems used for the registration of geometrical parameters in track measuring cars and elastic processes on loading trains [56][57][58][59][60][61][62]. It would allow us not only to estimate the condition of the track, taking into account the rolling stock, but also to predict the course of stress-strain processes of the track depending on the impact of the actual train traffic on the considered track [63][64][65][66].…”