Keywords: passenger car, automatic coupler, dynamic load, frame strength, modal analsis, biaxiality indicator.

The presented article includes the study of the dynamics and strength of the frame of a passenger car equipped with a new concept of an automatic coupler. The peculiarity of this device is that it reduces the dynamic loads acting on the frame due to the elastic-dissipative forces. These forces arise in it when it receives the longitudinal load from the body from an automatic coupler. A mathematical model of the longitudinal load of the passenger car body was carried out to substantiate the proposed decision. It was established that the use of the designed automatic coupler will contribute to the reduction of the longitudinal acceleration by 3.8% compared with a standard automatic coupler. Together with this, the strength of the load-bearing structure of the passenger car was studied. The results of the calculations showed that the maximum stresses in the frame are lower by 3.2% in comparison with a standard automatic coupler. Further, a modal analysis of the passenger car frame was carried out as part of the study. It is established that the operational safety of the passenger car from the modal properties point of view is met, as the first eigenfrequency of oscillation exceeds 8 Hz. Moreover, the biaxiality indicator of the passenger car frame equipped with a new concept of an automatic coupler was determined. The conducted research will contribute to develop the improvement of the efficiency of the passenger cars operation, as well as maintaining the competitiveness of the railway industry.

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