TY JOUR TI Refinement of the Mathematical Model of Inter-Car Coupling with Spring-Friction Absorbing Devices for the Study of Longitudinal Vibrations of a Freight Train KW Mathematical model of the train KW mathematical model of the absorbing device KW inter-car couplings of the train KW longitudinal forces in the train KW longitudinal train dynamics KW absorbing device JO Bulletin of scientific research results AU Bespal'ko, S.V. AU Zhuhin, N.O. AU Pudovikov, O.E. PY 2023 IS 2023 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"