Research into the loading of a removable module for transportation of long freight in a combined train by the train ferry

Abstract

The article presents the results of determination of the loading of a removable module for transportation of long freight in a combined train by the train ferry. The article describes the results of the mathematical modelling of the dynamic loading on a removable module placed on the flat car during rolling motion of the train ferry. It suggested that the flat car was rigidly fastened and displaced together with the deck. The displacements of the removable module relative to the flat car frame and the freight relative to the removable module were neglected. The mathematical model was solved with the method of variation of constants and confirmed by means of calculation in Mathcad. It was found that the maximum value of acceleration to the flat car with the removable module was about 2.35 m/s2 (0.24g). The value of acceleration obtained was included in the strength calculation for the removable module. The calculation was based on the finite element method and realized in SolidWorks Simulation with the Mises criterion. The finite element model was formed with spatial isoparametric tetrahedrons. The results of the calculation demonstrated that the maximum equivalent stresses were in the contact area between the vertical posts and the fittings; they amounted to 284.7 MPa. The stresses obtained were lower than the allowable values by 17.5%. The yield strength of the structural material was taken as the allowable stress. The equilibrium stability factor for the removable module was also determined. The strength of the removable module on the flat car without proper displacements and with the long freight inside was provided at the roll angles of the train ferry up to 25°. The results of the research will be of value for those who are dealing with development of transport facilities with better operational efficiency for combined transportation.Key words: removable module, dynamic loading, strength, equilibrium stability, train ferry transportation.