Scheduling of Yard Truck Considering Loading and Unloading Simultaneously in an Underground Container Logistics System

2021 ◽  
pp. 036119812110478
Author(s):  
Yinping Gao ◽  
Daofang Chang ◽  
Jun Yuan ◽  
Chengji Liang
Keyword(s):  
Genetic Algorithm ◽  
Container Terminals ◽  
Mixed Integer ◽  
Operating Efficiency ◽  
Adaptive Genetic Algorithm ◽  
Integer Programming Problem ◽  
Logistics System ◽  
Container Logistics ◽  
Loading And Unloading ◽  
Mixed Integer Programming Problem

With the rapid growth of containers and scarce of land, the underground container logistics system (UCLS) presents a logical alternative for container terminals to better protect the environment and relieve traffic pressure. The operating efficiency of container terminals is one of the competitive edges over other terminals, which requires UCLS to be well integrated with the handling process of the storage yard. In UCLS, yard trucks (YTs) serve different handling points dynamically instead of one fixed handling point, and yard cranes (YCs) perform loading and unloading simultaneously. To minimize the total time of handling all containers in UCLS, the mixed integer programming problem is described and solved using an adaptive genetic algorithm (AGA). The convergence speed and accuracy of AGA are demonstrated by comparison with conventional genetic algorithm (GA). Additionally, AGA and CPLEX are compared with different scale cases. Experimental results show that the proposed algorithm is superior to CPLEX in resulted solutions and calculation time. A sensitivity analysis is provided to obtain reasonable numbers of YTs for scheduling between handling points and the storage yard in UCLS.

scholarly journals SIMULATION MODEL OF LOGISTICS SYSTEM

2019 ◽  
pp. 553-559
Author(s):  
Svilen Stefanov ◽  
Venelin Terziev ◽  
Vanya Banabakova
Keyword(s):  
Simulation Model ◽  
Logistics System

scholarly journals Scheduling Approach for the Simulation of a Sustainable Resource Supply Chain

Logistics ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 12
Author(s):  
Henning Strubelt ◽  
Sebastian Trojahn ◽  
Sebastian Lang ◽  
Abdulrahman Nahhas
Keyword(s):  
Simulation Model ◽  
Storage Site ◽  
Limited Capacity ◽  
Logistics System ◽  
Priority Index ◽  
Waste Storage ◽  
General Goal ◽  
Underground Waste Storage ◽  
Performance Results ◽  
Plant Simulation

The general goal of waste management is to conserve resources and avoid negative environmental impacts. This paper deals with the optimization of logistics processes at an underground waste storage site by means of solving scheduling issues and reducing setup times, with the help of a simulation model. Specific to underground waste storage is the fact that it is often only a side business to actual mining. With limited capacity and resources, all legal requirements must be met, while the business should still be profitable. This paper discusses the improvement of a logistical system’s performance using machine scheduling approaches with the support of a plant simulation model. The process sequence is determined by means of a priority index. Genetic algorithms are then applied to improve the priority index to further increase performance. Results of the simulation model show that the performance of the logistics system can be increased by up to 400 percent, ensuring adequate system performance for current as well as future demand without changes to the system’s capacities and resources.

scholarly journals ANALYSIS OF THE CURRENT STATE OF THE CONTAINER TRANSPORTATION MARKET AND WAYS OF ITS DEVELOPMENT ON THE CHINA-UKRAINE-EU ROUTE

2021 ◽  
pp. 70-78
Author(s):  
Denis Lomotko ◽  
Kristina Holovan
Keyword(s):  
Free Market ◽  
Container Terminals ◽  
Rolling Stock ◽  
Container Transportation ◽  
Logistics System ◽  
Container Logistics ◽  
Equipment Safety ◽  
Railway Infrastructure ◽  
The One ◽  
High Level

Considering the globalization of international market relations, the article deals withthe modern market for international container traffic on the China-Ukraine-EU route. Through myresearch, it has become clear that the international rail container transportation market is evolvingrapidly and the development of railway infrastructure is rapidly becoming a lucrative investment.The potential is evident as demonstrated by the fact that China is considering rail containertransportation as an effective alternative to the traditional transportation methods such as sea- andairfreight intermodal container transportation of goods in the nearest future. There are distinctadvantages to rail container transportation, namely: versatility; mobility; distribution of containerhandling equipment; safety of cargo as well as speed of delivery. The article points out the majorproblems related to container transportation in Ukraine: poor condition of highways; deteriorationof rolling stock and railway infrastructure in general; lack of sufficient quantity and low availabilityof modern equipment at container terminals in Ukraine; a low competitive level of transport service;high level of bureaucracy on the railway and in customs clearance. In a free-market economy and,in particular, during industry restructuring, the author proposes a new approach to organizecontainer transportation in Ukraine and for the Ukrainian railway, which should reduce the costs ofrailway traffic , on the one hand, and make it more attractive to the users, thereby confirming itscompetitive advantages. The author came to the conclusion that, owing to the development of therailway infrastructure, namely the construction of a container logistics system and high-speedrailways on the territory of Ukraine, it is possible to not only reach a competitive level of transitstates on the China-EU route but also to take a preferred position as the most economical and fastest means of transit, obtaining a substantial profit and an incentive for the further development of thetransit potential of our country.  

scholarly journals Modeling of the two shuttle box system within the internal logistics system using simulation software

2021 ◽  
Vol 11 (1) ◽  
pp. 887-895
Author(s):  
David Strnad ◽  
Gabriel Fedorko ◽  
Patrik Ščavnický
Keyword(s):  
Simulation Model ◽  
Transport System ◽  
Production System ◽  
Simulation Software ◽  
Assembly Process ◽  
Material Flows ◽  
Assembly Lines ◽  
Logistics System ◽  
Shuttle Box ◽  
Efficiency And Effectiveness

Abstract The efficiency and effectiveness of the production system are influenced by the logistical arrangement of material flows. The smooth production, especially for assembly lines in the required quantity and at the required time (JIT or JIS systems), is currently ensured by automatically controlled towing sets (logistics trains), which consist of a tractor and several trucks. Another factor that affects the smooth production of assembly lines is the system of controlling the circulation of transport units. The number of transport units used in combination with the transport system significantly affects the efficiency of assembly workplaces. This article presents an analysis of the supply of assembly workplaces using a system of two shuttle boxes. The aim of this article is to investigate the influence of transport speed and capacity on the smoothness of the assembly process. Within the described analysis, the transport of 50,000 components is analyzed using a simulation model, while the length of the transport route is 32 km and 65 transport units per shift are used.

scholarly journals CONSTRUCTION OF A SIMULATION MODEL OF MANAGEMENT OF INTERNAL COMMODITY FLOWS OF PHARMACY NETWORKS

2020 ◽  
pp. 89-96
Author(s):  
Victoria Vavilova
Keyword(s):  
Simulation Model ◽  
Dynamic Model ◽  
Demand Uncertainty ◽  
Methodological Approach ◽  
Logistics System ◽  
Flow Management ◽  
Commodity Flow ◽  
Commodity Flows ◽  
Logistics Systems ◽  
Product Flow

Purpose. The aim of the article is to develop a simulation model of internal product flow management processes of pharmacy networks. Methodology of research. The theoretical basis for building a system and dynamic model of flow control in the logistics system of the pharmacy network are scientific articles by domestic and foreign scientists on the problems of management of logistics and flow of pharmaceutical companies and pharmacy networks. The following research methods are used to achieve this goal: analysis and synthesis (in the study of the theoretical foundations of the formation of logistics systems of pharmacy networks); economic and mathematical modelling (to optimize the management of domestic commodity flows). Findings. A simulation system and dynamic model of product flow management of the logistics system of the pharmacy network in conditions of demand uncertainty has been developed, in particular: 1) the input variables and parameters of the commodity flow management model in the logistics system of the pharmacy network are studied, the limitations and conditions of its application are formed; 2) a system of difference equations of levels, rates and auxiliary variables of the model is developed. Originality. Scientific and methodological approach to the management of commodity flows of logistics systems of pharmacy networks in terms of random demand is improved on the basis of a simulation model of system dynamics. It includes a sub-model of commodity flows and a sub-model of accounting for logistics costs, the implementation of which within the mechanism of management of commodity flows of logistics systems of pharmacy networks allows to simplify the process of analysis and management of the pharmacy network management decisions of operational and tactical nature. Practical value. The results of the study can be applied in practical activities of pharmacy networks in order to increase the efficiency of formation and operation of their logistics systems. Key words: commodity flow management, logistics systems of pharmacy networks, optimization, modelling.

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