Abstract
An increase in the volume of bulk cargo transportation through international transport corridors necessitates the commissioning of tank containers. Intermodalization of a tank container predetermines its load in various operating conditions depending on the type of vehicle on which it is carried: aviation, sea, air or rail. The analysis of the operating conditions of tank containers, as well as the regulatory documents governing their workload, led to the conclusion that the most dynamic loads acting on the supporting structures during transportation by rail. Namely, during the maneuvering collision of a wagon-platform, on which there are tank containers. In this case, it is stipulated that for a loaded tank container, the dynamic load is assumed to be 4g, and for an empty (for the purpose of checking the reinforcement) – 5g. It is important to note that when the tank container is underfilled with bulk cargo and taking into account movements of fittings relative to fittings, the maximum value of dynamic load can reach significantly larger values. Therefore, in order to ensure the strength of tank containers, an improvement of their structures has been proposed by introducing elastic-viscous bonds into the fittings. To determine the dynamic loading of the tank container, taking into account the improvement measures, mathematical models have been compiled, taking into account the presence of elastic, viscous and elastic-viscous bonds between the fittings, stops and fittings. It is established that the elastic bond does not fully compensate for the dynamic loads acting on the tank container. The results of mathematical modeling of dynamic loading, taking into account the presence of viscous and elastic-viscous coupling in the fittings, made it possible to conclude that the maximum accelerations per tank container do not exceed the normalized values. The determination of the dynamic loading of the tank container is also carried out by computer simulation using the finite element method. The calculation takes place in the software package CosmosWorks. The maximum values of accelerations are obtained, as well as their distribution fields relative to the supporting structure of the tank container. The developed models are verified by the Fisher criterion. The research will contribute to the creation of tank containers with improved technical, operational, as well as environmental characteristics and an increase in the efficiency of the liquid cargo transportation process through international transport corridors.
Highlights
Improving the efficiency of the transportation process through international transport corridors makes it necessary to introduce intermodal means into the transport process
The results of modeling the dynamic loading of the tank container, taking into account the viscous bond between the fittings and the fitting stops, made it possible to conclude that the maximum accelerations acting on the supporting structure of the tank container are 41.4 m/s2
A simulation of the loading of the tank container placed on the wagon-platform during a maneuvering collision is carried out
Summary
Improving the efficiency of the transportation process through international transport corridors makes it necessary to introduce intermodal means into the transport process. It is important to note that the degree of dynamic loading of containers in operation can reach significant values [2,3,4,5] This is due to the action on the wagon-platform with tank containers during a maneuvering impact load of 3.5 MN [6,7,8]. The movement of bulk cargo in the tank container boiler causes additional force on the supporting structure [10] All these factors can contribute to damage to the structural elements of tank containers and wagons. To determine the dynamic loading of the tank container during a maneuvering collision, taking into account improvement measures, a mathematical model (1) is compiled, which takes into (2019), «EUREKA: Physics and Engineering» Number 2 account the movement of the tank container placed on the wagon-platform.
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