PSI - Issue 36

O. Fomin et al. / Procedia Structural Integrity 36 (2022) 239–246 Oleksij Fomin, Alyona Lovska, Volodymyr Bohomia et al. / Structural Integrity Procedia 00 (2021) 000 – 000

241

Nomenclature M 1

mass of the tank wagon frame M 2 , M 3 masses of the first and the second trolley along the movement direction, respectively M 4 mass of the pot k' k rigidity of connection between the pot and its supports С і j characteristics of elasticity of the elements of the oscillating system, which are determined by the values of rigidity coefficients of the springs k Т B і j dispersion function k track rigidity β damping coefficient F fr absolute friction force in the spring set δ і deformations of elastic elements of the spring suspension η(t) track irregularity h depth of the roughness. ω oscillation frequency, which is determined by the formula ω=2πV/L V wagon speed L length of the roughness  а, е calculated value of amplitude of dynamic stress of a conditional symmetric cycle, reduced to the base N 0 , equivalent in damaging effect to the value of amplitudes in the real mode of operational random stresses during the project life cycle  n  allowable coefficient of fatigue resistance reserve 2. Methodology The purpose of the article is to highlight the results of determining the dynamic loading of a tank wagon with malleable links between the pot and the frame. To achieve this goal, the following research methodology was used. At the initial stage, the dynamic load of the of the load-bearing structure of a tank wagon with malleable links between the pot and the frame by mathematical modelling. After that, the dynamic loading of the load-bearing structure of a tank wagon with malleable links between the pot and the frame by computer modelling. At the next stage of the study, the calculation of the coefficient of fatigue strength reserve of the load-bearing structure of a tank wagon. 3. Results and discussion To reduce the dynamic loading of the load-bearing structure of a tank wagon and increase the fatigue strength at operational modes, it is proposed to introduce elastic and frictional links between the pot supports and the pot. This provides for the damping of dynamic loadings acting on the pot, due to the forces of elastic and frictional resistance arising from the oscillations of bouncing. To determine the dynamic loading of a tank wagon, mathematical modelling was performed. The tank wagon of model 15-1443-06 with actual sizes of components of the load-bearing structure was chosen as a prototype. The research was conducted in a flat coordinate system. The calculation scheme of a tank wagon is shown in Fig. 1. The case of movement of a tank wagon in an empty state is considered.