Wyniki wyszukiwania - BazTech

1

Method of truck crew work coordination on international routes

Taran Igor, Zhumatayeva Gaziza, Oliskevych Myroslav, Szarata Mateusz

Transport Problems

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2024

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T. 19, z. 2

205--218

EN

The article deals with the problem of increasing the productivity of trucks in the performance of international road freight transportation in Eastern Europe and the European Union. There are restrictions on cabotage transportation (domestic cabotage), as well as time limits for the execution of orders and penalties for the execution of the entire volume of transportation in this case in addition to the restrictions of the European Agreement E/ECE/TRANS/564. The task of optimizing the required number of vehicles, drivers/driving crews, and route configuration was formulated and solved by mathematical programming with time constraints. At the same time, a variable method of organizing the work of drivers on adjacent routes was applied, by which drivers/crews are not assigned to a specific vehicle but are changed after a certain number of work hours. This minimized the non-productive idling of trucks, ensured compliance with the work and rest regulations of drivers, and minimized truck mileage on routes. In contrast to known methods and research results, the problem is solved with a guaranteed achievement of the optimum in an acceptable search time. This result was achieved due to the appropriate formulation of the solution conditions. The results can be applied in the logistic planning of transport processes.

2

Improving the methodology for optimizing multimodal transportation delivery routes and cyclic schedules in a transnational direction

Taran Igor, Bikhimova Guldana, Danchuk Victor, Toktamyssova Aliya, Tursymbekova Zakira, Oliskevych Myroslav

Transport Problems

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2024

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T. 19, z. 1

157--170

EN

This study considers the task of planning the routes of multimodal transnational cargo transportation. Due to the extremely long length of such routes, delivery times and costs per cargo unit are extremely important. Delays in various types of transport and in the case of cargo transshipment are associated not only with the growth of cargo flows but also with the inconsistency of vehicle schedules. The purpose of this study is to improve the previously developed methodology for optimizing multimodal cargo transportation, taking into account the need for its application to transnational transport corridors. The content of the formulated network problem is reduced to a modification of the traveling salesman problem with an unknown number of transport points the route should pass through. Such a problem is NP-hard due to the time complexity of the algorithms. A modified algorithm has been developed, according to which the general problem with the number of N points is divided into several subproblems. Transport points are grouped into consecutive subsets that are related by only one non-alternative way of transportation. This way can be any “bottleneck” of the transport network or an artificially created one. Such a decomposition of the problem gives a set of partial solutions, which were combined into the final optimal solution. The obtained solution to the routing problem of multimodal routes takes into account the cyclical schedules of the transport operation and gives a guaranteed exact optimum for calculations performed within the permissible time. In addition to determining the optimal route, the algorithm makes it possible to determine the required number of vehicles and their work schedules depending on the total cargo flow on the route.

3

Substantiation of a reasonable number of forklifts for a warehouse complex with frontal racks in an anylogic environment

Zhanbirov Galymzhan, Litvin Vadim, Taran Igor, Izteleuova Maral, Aliakbarkyzy Dana

Transport Problems

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2023

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T. 18, z. 2

147--160

EN

This paper is devoted to the study of the impact of volumetric planning solutions and the main production and technological parameters of a modern warehouse on the effectiveness of its functioning. The object of analysis is a class A warehouse complex located in Almaty. Simulation modeling was utilized to find and substantiate management decisions. The software product AnyLogic was used as the environment for the simulation. This paper develops a generalized algorithm for creating simulation models of warehouse complexes and a simulation model consisting of 114 blocks. The model is presented in the form of a black box, which made it possible to identify and establish correlations and relations between the input and output parameters of the warehouse, as well as its resources. A simulation experiment was conducted consisting of 63 model calculations. Variation parameters were the number of loading and unloading docks, as well as the number of forklifts in the storage area. As a result of the simulation, four options for the operation of the warehouse were established to ensure the unloading and loading of the required number of cars during the day. The optimal variant of the functioning of the warehouse complex was chosen on the basis of the proposed comprehensive criterion.

4

Improving the efficiency of vehicle operation and its environmental friendliness within the controlled crossings

Turpak Serhii, Trushevsky Vjacheslav, Kuz’kin Olexiy, Gritcay Sergey, Taran Igor

Transport Problems

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2021

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T. 16, z. 3

119--130

EN

This paper is devoted to improving both the efficiency and the environmental friendliness of road vehicles during their operations through optimization of traffic phase duration within the controlled crossings. A novel criterion to optimize traffic phase duration within a controlled crossing is proposed. The proposed criterion supposes the minimal total delays of all road users waiting for a permissive traffic signal at the crossing and takes into consideration both pedestrian density and the number of passengers in vehicles. The calculation technique for the traffic phase was proposed, according to which delays of all road users were optimized, helping to improve the efficiency of vehicle operation within crossings. Based on the method, a technique to control traffic within crossings is developed and tested. Comparative analysis confirmed the decrease in unproductive delays of vehicles within the controlled crossings by contrast with the traditional approach. The technique makes it possible to reduce the delay of road users by 15-20% depending upon road crowding, the number of pedestrians, and passengers. Owing to the decreased period of waiting for a permissive traffic signal, the energy efficiency of public transport increases.

5

Power flows in a hydrostatic-mechanical transmission of a mining locomotive during the braking process

Samorodov Vadym, Bondarenko Anatoliy, Taran Igor, Klymenko Iryna

Transport Problems

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2020

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T. 15, z. 3

17--28

EN

This paper considers the braking process of a mine diesel locomotive with hydrostatic mechanical transmission (HSMT) operating according to the “input differential” scheme. Braking process modeling involves four implementation methods. Identification and systematization of basic regularities in the distribution of power flows within a closed transmission contour in the process of braking have been performed with the help of software support developed by means of MatLab/Simulink. The simulation results of braking due to the hydrostatic transmission and the braking system during the movement of a diesel locomotive in the transport and traction ranges are presented in the form of graphical correlations. The process of theoretical studies of the braking process of a diesel locomotive with HSMT operating according to the “input differential” scheme has helped determine that, in terms of deceleration at the expense of a hydrostatic drive (HSD) and braking system while preserving kinematic engine-wheels connection, it is not permitted to implement this method of braking process as it is followed by excess of the allowable value of working pressure differential within HSD up to 2.8 times.