Логістична техноЛогія доставки сировини дЛя метаЛургійного виробництваPurpose. To formalize logistic systems and technologies concerning the management of cargo delivery in terms of metallurgical production taking into consideration interaction between motor transport and railway transport. It is required to develop a logistic technology to manage transport generalizing efficiency indices and making it possible to optimize functioning of general transportation system of an enterprise.Methodology. System analysis and logistic approach have been used. Transportation system of an enterprise has been analyzed from the viewpoint of logistics. The analysis makes it possible to integrate efficiency indices of functioning of certain subsystems of the general micrologistic system. Objective function and general model of transportation system optimization have been determined.Findings. Logistic technology providing optimization of the parameters of transportation system functioning according to general logistic criterion has been represented. Micrologistic systems have been singled out; tendencies to control the delivery aimed at providing functional efficiency of transportation system of an enterprise have been determined. Parameters and factors determining the parameters of transportation efficiency to the fullest extent being the basis of developing logistic transportation systems of enterprises have been identified.
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.