MAGAZINE  №1 (96) February 2020

AUTHORS BAZHINA D.B., LUKINSKIY V.S., NIKOLAEVSKIY N.N.

CATEGORY Simulation modelling

 

ABSTRACT

The article covers issues of supply chain modeling being an important step in the decision-making process. Logistics and supply chain management consider movement and transition of material flow as well as financial, information and other flows associated with it. The characteristics of a flow must be measured considering the dynamics of the flow movement. This determines the importance of simulation modeling in decision-making support system as the approach involves the implementation of modeling system algorithm functioning in a virtual time environment.

 

The literature analysis, on the one hand, allowed to conclude that the traditional approach to functioning process characteristics determination involving consistent problem solving on the level of supply chain element, is limited or not reflecting the specifics of real processes where the parameters variability in time is possible. On the other hand, there is lack of specific recommendations on building models based on principles of system dynamics as a simulation modeling tool which allows to consider process characteristics variability. This determines the aim of the research a part of which presents supply chain simulation model illustrating the possibilities of the approach. The results of the work can be used both in practice for industrial enterprises and for future research.

 

 Electronic version

 Keywords: simulation modeling simulation simulation model system dynamics supply chain modeling modelling decision support system decision making

Published in Simulation modelling

MAGAZINE  №6 (95) December 2019

AUTHORS ERMOLINA M.V., ZAKHODYAKIN G.V. 

CATEGORY  Information technologies in logistics and SCM Inventory management Simulation modelling

 

ABSTRACT

 The article considers the situation when a company needs to distribute limited amount of stock to the regional warehouses in its own two-echelon distribution network. The network consists of a single distribution center and several regional facilities which are serving the company's customers. It is supposed that every warehouse calculates its requirements for the replenishment daily basing on the on-hand inventory, demand forecast, safety stocks and lead-times from the central warehouse. Thus, company's managers are aware of the consumption rate and inventory level at each regional facility. Demand forecasting and final replenishment planning decisions are centralized.
Notion of the "limited stock" refers to such inventory quantity at the central warehouse that is insufficient to satisfy the total volume of all regional warehouses' requirements for the product. Limited stock situation may have varying length in time.
A system of rationing rules or principles should be applied to make a distribution decision in such a situation. These set of rules identify the volume and sequence of the shipments from the central to regional warehouses.
So, in this article authors aim to solve the following problems:
- to identify factors that affect the choice of a certain set of rationing rules for the limited stock;
- to attempt to classify existing rationing principles;
- to identify how the business goals affect the choice of the preferred rationing principle;
- to create an imitation model and check experimentally which rationing principles are the best for each of the business goal
The outcomes gained might be used as a base for the choice of the limited stock rationing principles in companies with own distribution network, and for better tuning of the distribution algorithms in DRP systems or modules.

 Electronic version

 Keywords: inventory management imitation modeling simulation modeling simulation model inventory planning optimization stock rationing stock DRP

 

Thursday, 24 January 2019 19:31

Simulation of Dynamic Supply Chains

MAGAZINE №6(89) December 2018

AUTHOR LYCHKINA N.N.

CATEGORY Analytics and reviews Simulation modelling

ABSTRACT

This article explores the possibilities of modern simulation modeling in the tasks of design and supply chain modeling as systems with structural and dynamic complexity, the study of which should be carried out taking into account multiple risk factors and uncertainties, considering and evaluating the efficiency, dynamism, flexibility and adaptability of the SC based on a variety of indicators used in logistic practice. The use of simulation modeling requires the adaptation of modern managerial techniques and approaches used in logistic practice with the technique of simulation  modeling . Useful management techniques based on the use of simulation techniques in the analysis and modeling of SCs are considered, as well as methods of constructing conceptual models of the SC and analysis of the SC using simulation modeling, iterative simulation and optimization procedures for integrated research and optimization of the SC.

A review of the capabilities of various simulation paradigms for analyzing SCs and a review of related scientific literature are also being conducted. It is shown in particular that process simulation modeling is effective for describing the network structure and logistic processes in the SC and is actively used in reengineering projects based on SCOR-recommendations. System-dynamic models of adaptive supply chains allow you to study the complex interaction of material, information and financial flows in the SC, to analyze the stability of the SC, to coordinate the business strategy and logistics strategy of the company. Agent-based simulation modeling makes it possible to describe the behavior, processes of cooperation, coordination and inter-organizational interaction of the participants of the SC and reconfigurable network structures of the SC.

 Electronic version

 Keywords:  

Published in Analytics and reviews

MAGAZINE №3 (80) June 2017

AUTHORS

NIKOLAEVSKIY N.N.

PILIPCHUK S.F.

SPASSKIJ Y.B. - Project Chief Engineer, LLC «Morstroytechnology» (St. Petersburg, Russia)

CATEGORY  Logistic infrastructure Simulation modelling

ABSTRACT

From the beginning of the 21st century the domestic economy development is characterized by the growth of energy resources export volumes (including coal). This circumstance determined the increased demand for the design, research and modernization of export bulk cargo terminals. Customers’ requirements growth and outdated standards, regulations and specifications define the need to improve design quality. This article covers the issue of material handling technology justification in the stockyard area of the export bulk cargo terminal within organizational and technical design. These terminals have a large throughput capacity and unidirectional material flow. These peculiarities determine their narrow specialization and increased demands for terminals’ functioning reliability. Providing material handling technology in the stockyard area is based on using specialized high-performance equipments with stream-flow transportation – stackers and reclaimers, as well as their combined type – stacker-reclaimers. That circumstance defined appropriateness of the equipment selection type problem research (separate or combined) taking into account special aspects. To solve this problem, the authors suggested to use simulation methods that allowed to create a simulation model of the stockyard area functioning and to carry out experiments of parameters variation. The results allowed to estimate the range of incoming and outgoing flow intensity, which determines preference of choosing schemes with separate or combined equipment’ type. A formalized selection process by using the qualimetry methods based on a system of criteria was offered in reason of accounting special aspects of functioning within justification of the most effective material handling technology with increased accuracy. Mathematical tool, that is used in proposed selection procedure, allows to take into account many parameters, including qualitative characteristics, although it is difficult to present them in concrete values form. Thus, accounting special aspects of functioning becomes possible, which in general allows to substantiate the most effective material handling technology. 

 Electronic version

 Keywords:  

MAGAZINE №6 (77) December 2016

AUTHORS  

KURENKOV P.V.

SECHKEREV A.A. - Senior Lecturer, Operational performance management Chair, Russian Transport Academy opened, Moscow State University of Railway Engineering (MIIT) Emperor Nicholas II (Moscow, Russia)

CATEGORY  Logistic infrastructure Simulation modelling

ABSTRACT

The forecasting works on cargo traffic appearance at railway stations is in hand for a long time. The possibility of station processes simulation modelling usage is considered. The main structural objects which are necessary for model creation and their technical parameters are determined. The structure for working in the software program “Anylogic” is developed. The program is configured for different situations forecasting with the possibility to choose the best result. For this purpose the input parameters are inserted into the system. They are train set approach, arrival time, schedule, wotk technology and operations sequence, loading and discharging plan, etc. The analysis of received results with subsequent decision making concerning the further process modelling for necessary results generation is carried out.

The model uses the station technological development effectively, defines the componentwise system load, determines bottlenecks. Moreover, it gives an opportunity to realize concerned processes speed regulation and operation period. It serves as the the element of the scenario forecasting system for the whole region operation. The model optimizes data collection process, regulate required resources (the amount of used railways, the nubner of required fleet of cars, etc.|) and calculates the railway station performance indicators. “Anylogic” software usage allows forecasting of work schedule for the nearest day (and more) with the opportunity to correct and influence the situation rapidly until the required result is achieved

 Keywords:  

Published in Simulation modelling

MAGAZINE №6 (71) December 2015

AUTHORS  

KURENKOV P.V. 

ZAITSEV T.A.Postgraduate, Department «Transport business», Moscow State Transport University (Moscow, Russia)

CATEGORY Simulation  Transportation 

ABSTRACT

In this article five ways of freight delivery are considered: truck-mounted with the ISO 40 ft container mounted on the truck, standard railway with the 40 ft container in the regular Mercury train set, railway with the “box car” in the one-way train and contrailer (both accompanied and unaccompanied). The contrailer technology proves to be the fastest and the least unprofitable one.

 Keywords:  

MAGAZINE  №6 (59) December 2013

AUTHOR  Pilipchuk  S. F.Radaev А. Е. 

CATEGORY  Inventory management Optimization and economic-mathematical modeling Simulation

ABSTRACT

Even nowadays the task of supply batch’s optimal size determination, which was first examined as long ago as the beginning of previous century, is one of the most actual tasks concerning warehouse systems’ organization of functioning. But the results of the calculation based on Willson’s formula or its further modifications (economical and mathematical models) have restricted practical significance caused by not-taking account of both time factor and stochastic nature of important parameters of logistic process. Mentioned feature defined reasonability of simulation modeling software’s application for solving the task of supply batch’s optimal size determination to achieve more appropriate calculation results. 

 Keywords:  

 

Published in Simulation modelling

MAGAZINE №5 (64) October 2014

AUTHOR LYCHKINA N.N.GLAZKOV D.N., HORUZHEVSKAYA A.P.

CATEGORY Simulation Corporate logistics industrial companies

ABSTRACT

This article demonstrates how to use the method of simulation modeling in AnyLogic in order to optimize the logistics network of industrial company operating in the industrial gas market. The model detailed basic processes associated with the transport of the product, the service requests of customers and distribution of the product to consumers. Factors were taken into account, bearing the stochastic nature, such as unevenness of production, weather conditions that affect the level of demand, the number of failures of vehicles, vehicle repair time. On the developed model, a number of scenario studies, which identified the optimal values of the control parameters of a logistics network: the number of rolling stock, additional storage capacity, minimizing the loss of the deficit and the lack of free rolling, leading ultimately to lower total cost of ownership (TCO) .

 Keywords:  

Published in Simulation modelling

MAGAZINE №5 (64) October 2014

AUTHOR LYCHKINA N.N.

CATEGORY Simulation Logistics infrastructure

ABSTRACT

The article describes the main problems of Russia's transport infrastructure, and in particular, in the Moscow region. As part of the decision of tasks demonstrates the use of simulation as the most effective tool for testing the design and investment decisions by the example of the construction of the Dmitrov interregional multimodal logistics center.

 Keywords:  

 

Published in Simulation modelling

MAGAZINE №5 (64) October 2014

AUTHOR SOLODOVNIKOV V.V. 

CATEGORY Planning the supply chain Information Technology in Logistics and SCM Optimization and economic-mathematical modeling 

ABSTRACT

It is impossible to manage a contemporary company without strategic planning and regular monitoring of goals and development direction of supply chain. Top management is in charge of solving tasks regarding merges and acquisitions, competition in the regional markets, influences of price change of raw material and components, problems of JIT transportations, demand structure and geography changes in the regional markets, strategic investment program definition.  

Nevertheless in practice it is rare when the process of supply chain modeling and design is formalized at Russian companies. Analysis of supply chain efficiency is done sporadically, takes a lot of time, is not accurate and often is at too high level without consideration of the complex influence on the supply chain infrastructure. Trend to increasing complexity of material, financial and informational flows in supply chains of leading companies defines necessity in informational support of such important planning process. In recent decades specialized methods and technologies were built for modeling complex supply chains respecting production, resource, distribution and other constrains. One of the most important goals of these methods and technologies is informational support of strategic supply chain planning. The article provides typical tasks of supply chain planning, key methods of strategic modeling and also most popular mathematical software for this

 Keywords:  

Published in Supply chain planning

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