PSI - Issue 59

O. Fomin et al. / Procedia Structural Integrity 59 (2024) 516–522 4 Oleksij Fomin, Pavlo Prokopenko, Yevhenii Medvediev, Larysa Degtyareva / Structural Integrity Procedia 00 (2023) 000 – 000 - development of theoretical provisions for conducting research; - carrying out running dynamic tests with the determination of indicators of the dynamic qualities of the wagon during its movement and dropping from wedges with the determination and evaluation of the natural frequencies of oscillations. - analysis of results and determination of recommendations. Running dynamic tests were carried out by specialists of the research and implementation center of the "NDKTI" branch of JSC "Ukrzaliznytsia" in the conditions of real operation of such wagons by the method of recording processes at the control points of the bogie parts during experimental trips in the range of operational speeds. Based on the results of the measurements, calculations are performed, running dynamic qualities are evaluated, and the safe location of experimental wagons in the freight train is evaluated. Running dynamic tests were conducted using various options for setting up experimental wagons in a freight train (Fig. 1). 519

Fig. 1. (a) version 1; (b) version 2; version 3.

The stability of the wheel against derailment is estimated by the formula,

2(b ) a 

2b

b

b

a

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(

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hl

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

2(b ) a 

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(

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Also, while running dynamic tests, the force was recorded on the autocoupling dynamometer at different locations in the train of experimental wagons (Fig. 2).

Fig. 2. (a) at the head of the train; (b) in the middle of the train; (c) at the end of the train.