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Methodology for evaluating the dynamic parameters of the rubber-cord shell of a high speed rolling stock pneumatic spring in the wheel-frog interaction of a railroad switch

Kuzyshyn Andrii, Kovalchuk Vitalii, Royko Yuriy, Kravets Ivan, Sobolevska Yuliya, Boikiv Mykola

Archives of Transport

2025

Vol. 73, iss. 1

35--52

The object of research is a pneumatic spring of the spring suspension system for high-speed railway rolling stock. A methodology for full-scale dynamic testing of a pneumatic spring of high-speed rolling stock when interacting with a rail track has been developed. The vertical, transverse, and longitudinal accelerations of the rubber-cord shell of the pneumatic spring of the high-speed rolling stock during trailing and facing directions movement along the turnout crossing are determined. It is established that the average values of vertical accelerations in the trailing direction and facing direction movements are higher than the average values of transverse and longitudinal accelerations. It is noted that the values of the average values of vertical and longitudinal accelerations in the trailing direction movement are 24.6% and 13.9% higher than the average values of the accelerations in the facing direction movement. Equality of the values of the average values of transverse accelerations in trailing direction and facing direction movements is noted. Graphs of the amplitude spectrum and logarithmic damping of vibrations of the rubber-cord shell of a pneumatic spring of high-speed rolling stock are obtained. It is established that the average value of the first natural frequency of oscillations of the rubber-cord shell of the pneumatic spring in the vertical, transverse and longitudinal directions during the trailing direction movement along the railroad turnout crossing is 3.17 Hz, 3.7 Hz and 3.49 Hz, and the logarithmic decrement of the oscillation damping is 0.46, 0.30 and 0.29, respectively. For the facing direction movement, the natural frequency is 3.45 Hz, 3.56 Hz, and 3.47 Hz, and the logarithmic decrement of oscillation damping is 0.35, 0.41, and 0.31, respectively. From a practical point of view, the obtained first frequencies of natural oscillations for the rubber-cord shell of the new pneumatic spring of the high-speed rolling stock are basic, which will allow further monitoring of the change in the dynamic characteristics of the pneumatic spring depending on the operational mileage of the rolling stock.