Oscillation of Reservoir of Tank-wagon in Dynamic Longitudinal Load

Abstract

Tank-wagons are typically designed to satisfy the static forces as well as their enlargement which is caused by the dynamic loads. However, sudden longitudinal impacts may cause a very rapid deformations of structural elements which can lead to the very complex physical phenomena. Apart from the oscillations of structural elements, changes of rheological properties of material, temperature changes, chemical changes, etc., may arise. During these occurrences, the behavior of the structure can be completely different from the behavior at the static load. Construction fails to obtain displacements that correspond to rapid changes in load, which can lead to sudden deformation of the structure. The sudden action of longitudinal load causes radial oscillations of reservoir. Thereby, if the load px is less than a certain value px,kr, these oscillations will have no increase in the amplitude of deflection around the equilibrium position. On the contrary, if the load px is higher than the value px,kr, amplitude of deflection increases with time and the reservoir loses stability. Besides, these oscillations may adversely affect the quality of running and safety of the train. Accordingly, this paper shows an example of tank-wagon and provides a method of determining the critical load from which an unlimited increase in the amplitude of deflection of the tank arises.