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Model of operational planning of freight transportation by tram as part of a green logistics system

Shramenko Natalya, Merkisz-Guranowska Agnieszka, Kiciński Marcin, Shramenko Vladyslav

Archives of Transport

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2022

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Vol. 63, iss. 3

113--122

EN

The introduction of environmentally friendly technologies is becoming increasingly necessary to combat global warming and air pollution in cities. The concept of ecologistics is seen as an effective approach to the management of materials and related flows in order to reduce environmental and economic damage to the environment. The sustainable development of green supply chains is based on the use of environmentally friendly types of vehicles, reduction of energy and other resources consumption, optimization of transport and technological processes in delivery systems. As part of the development of green supply chain, it is proposed to transport goods by freight trams, which eliminates the need for heavy trucks in the city, improves traffic conditions and reduces the environmental impact of transport. The research was conducted for the city of Poznan. The distribution system of the city of Poznan operates in conditions of stochastic demand for deliveries from clients and the risk of lack of sufficient supplies in distribution centers. To take into account the specificity of the distribution system of cargo delivery in conditions of uncertainty and risk, a simulation model of the organization of the material flows within the transport system of the city of Poznan has been proposed. The result of simulation is the optimal assignment of clients to the distribution centers, as well as the value of total mileage with the load, which is a random variable. It is assumed that the random variable is distributed according to the normal distribution law. The results were calculated and compared for two variants, i.e. for constant demand and sufficient quantity of cargo in distribution centers, and for variable demand and uncertainty conditions, e.g. insufficient cargo quantity in distribution centers. The purpose of the paper is to develop a simulation model for planning supplies of small consignments of goods by trams implementing green logistics concept with variable demand for transportation. After a short introduction of the problem, the literature review related to the concept of green logistics and requirements of transport and distribution system are presented in section 2. In section 3, the research problem and research methodology are described. Section 4 provides the results of assignment of clients to distribution centers. The paper ends with concluding remarks.

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Modelowanie matematyczne przepływu sprężonego powietrza przez filtr

Perz Karolina, Bieńczak Krzysztof, Rewolińska Aleksandra, Kiciński Marcin

Przemysł Chemiczny

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2020

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T. 99, nr 1

46--49

PL

Stworzono model matematyczny pozwalający określić obniżenie ciśnienia sprężonego powietrza w urządzeniach i elementach odpowiedzialnych za utrzymanie odpowiedniej jakości powietrza (filtry powietrza). Model powstał na podstawie badań eksperymentalnych. Stwierdzono, że największy wpływ na zmianę ciśnienia w sieci przy przepływie przez filtr ma czas eksploatacji filtra oraz prędkość przepływu powietrza. Wiedza dotycząca korelacji tych parametrów pozwoli na odpowiedni dobór czasu eksploatacji filtrów i na optymalne projektowanie sieci pneumatycznej.

EN

Drop in compressed air pressure dependent on air flow rate and presence of filters and their operation time in a pipeline network was found. A math. model of the pressure drop was developed.

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The characteristics of the Vehicle Maintenance System in Tactical Air Base

Chukowski Tomasz, Kiciński Marcin

Journal of Mechanical and Transport Engineering

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2019

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Vol. 71, No 1

5--16

EN

The subject of the paper is a functioning of the Vehicle Maintenance System (VMS) in the Tactical Air Base (TAB). In 2013 a new stationary Military Logistic System (MLS) was introduced based on the territorial division of the country. Newly created Regional Logistics Bases (RLB) and subordinated Garrison Support Units (GSU) have been essential for the new MLS. Due to the reform, military units have been relieved of economic and financial function, so that they can focus on operational tasks. The exceptions have been TAB and War Port Command (WPC) which have had operational tasks, but they have remained as economic departments and additionally have been tasked to give logistic and financial support for units deployed in allotted area of responsibility. In the wake of the above changes, the VMS was completely reorganized. The author’s present the rules of the VMS defined in the operative instructions and the organization of the VMS in the TAB. The article also analyzes selected indicators of the VMS based on equipment of the 21st TAB.

PL

Przedmiotem artykułu jest system obsług i napraw (OiN) pojazdów samochodowych (PS) funkcjonujący w Bazie Lotnictwa Taktycznego (BLT). W 2013 r. wprowadzono nowy stacjonarny Woskowy System Logistyczny oparty na podziale terytorialnym kraju. Powstały Regionalne Bazy Logistyczne, Wojskowe Oddziały Gospodarcze (WOG). BLT jako wyjątek pozostały oddziałami gospodarczymi i podobnie jak WOG otrzymały dodatkowe jednostki na zaopatrzenie gospodarcze w ramach przydzielonych rejonów odpowiedzialności. Wraz z powyższymi zmianami, zreorganizowano całkowicie system OiN PS. Wprowadzono nowe instrukcje (doktryny), które określiły role jednostek wojskowych, WOG oraz centralnych organów logistycznych w systemie OiN PS. Autorzy przedstawili m.in. zasady organizacji OiN PS w obowiązujących instrukcjach. Oprócz tego przeprowadzono również analizę wybranych wskaźników eksploatacji PS będących na wyposażeniu 21. BLT.