Scientific Journals
Zeszyty Naukowe
of the Maritime University of Szczecin
Akademii Morskiej w Szczecinie
Zeszyty Naukowe Akademii Morskiej w Szczecinie 63 (135) 5
2020, 63 (135), 5–6 ISSN 1733-8670 (Printed) ISSN 2392-0378 (Online) DOI: 10.17402/433
Editorial preface
Izabela Dembińska
Maritime University of Szczecin
11 Henryka Pobożnego St., 71-899 Szczecin, Poland e-mail: i.dembinska@am.szczecin.pl
Dear Readers,
I am pleased to announce the publication of the third edition (63(135)) of the Scientific Journals of the Maritime University of Szczecin in 2020. This edition contains the findings and opinions of the authors within thirteen articles, which are grouped into six fields: Civil Engineering and Transport, Environmental Engineer-ing, Mining and Energy, Electrical EngineerEngineer-ing, Mechanical EngineerEngineer-ing, Economics, Management and Quality Science, and Information and Communication Technology.
The Civil Engineering and Transport section begins with an article in which the authors provide an FMECA for a thermal deburring machine of a Slovak company to develop an efficient maintenance policy. The second article also covers maintenance issues by addressing freight cars used in railway transport. The authors used railroad car operation, maintenance, and failure data to establish a methodology to calculate the probability of failure and thereby determine the risk levels in the rolling stock maintenance policy. The author of the third article noted that the continued growth of transport systems and the extensive activities related to the system user safety require the development of methods to assess how the extension or upgrading of road infrastructure impacts road safety. The author aimed to develop an assessment concept that will form part of a comprehensive methodology for analyzing the operational reliability of transport systems. Conceptu-alized in the article is an assessment of the impact of road infrastructure on road safety that refers to the GAMAB and Road Safety Impact Assessment methods reported in the literature. The concept is based on a comparative analysis of the state of road infrastructure before and after expansion or upgrades, based on publicly-available data. The last article in this section deals with digitization, one of the most urgent modern determinants of economic activity. The authors consider the digitization of transport as a tool for achieving the European Union’s policy objectives set out in the Digital Single Market Strategy for Europe. For railway transport, digital innovation is necessary to increase its competitiveness, and one of the tools for the digital transformation of the railway is the fifth-generation of wireless communication systems (5G). The purpose of this article is to show the advantages of 5G deployment for railway operators. It describes unique flexibility in the allocation of 5G network resources, depending on the existing needs of rail traffic.
The Environmental Engineering, Mining and Energy section contains study, that elaborates on the modern technologies used for the production and utilization of methanol. Particular attention was paid to technology for energy storage in the form of “renewable” methanol generated from hydrogen produced using renewable surplus energy or from captured CO2. The paper presents a methanol production and treatment plant and a methodology for assessing the plant efficiency.
The Electrical Engineering section contains two studies. The first article demonstrates that an electrici-ty-and-power system is affected by various types of power quality disturbances, which have a detrimental effect on generators, transformers and electrical appliances. At the same time, the authors noted that some
6 Scientific Journals of the Maritime University of Szczecin 63 (135)
of the most harmful disturbances in power quality are voltage subharmonics, and the study describes the effect of voltage subharmonics on power losses and the heating-up of an induction motor. The second article presents methods for analyzing the power characteristics of generator sets with vector control of an asyn-chronous squirrel-cage machine. These methods facilitate analyses of the power characteristics of generator sets with field-oriented control (FOC) and direct torque control (DTC).
The Mechanical Engineering section also contains two studies. The authors of the first article presented an analysis of possible variants of a handling terminal system by considering the factors of the current devel-opment of the Russian transport system. Their considerations were directed at identifying the rationale and possible issues related to the lack of human presence in the technological process of an inland container terminal. The control system of a mini crane is reported in the second study of this section, which analyses a system employing a programmable logic-controlled exoskeleton.
The Economics, Management and Quality Science section presents three articles. The first examines the impact of exchange rate movements on international trade. The authors point out that various studies prove that the impact may vary between different sectors and countries. In the fishing industry, this relationship was not widely studied; therefore, an analysis was undertaken in this respect. Using the Emirmahmutoğlu and Köse causality test, the authors examined whether exchange rate fluctuations in certain countries affect-ed fish production. The authors of the next study consideraffect-ed the most important problem in recent months, COVID-19. As we have already seen, the pandemic is a strong determinant, not only of social life, but the economy as well. Recognizing the strong impact of COVID-19 on different spheres of our lives, the authors analyzed the impact of the coronavirus pandemic on the oil market. The authors of the third study in this section, assuming that the management process analysis allows the detection of weaknesses and strengths, analyzed the production line management processes. To this end, they created a queuing model for a pro-duction line and analyzed its performance and reliability. The attempted modelling was used to determine whether queuing theory can be used to mod-el processes in production lines.
In the last section, Information and Communication Technology, the authors evaluated the tracking per-formance of the GOOSE platform and compared it to a reference receiver. The quality and perper-formance were analyzed using raw measurements of three signals, GPS L1CA, L2CM and L5. The data were processed with the “zeroEdit” module of the TUB-NavSolutions software.
In conclusion, the presented articles address a wide range of contemporary problems that can initiate theoretical and empirical scientific research. We are aware that the problems are described only to a modest extent, yet we hope that the articles will inspire further research and considerations.
dr hab. Izabela Dembińska, Associate Professor Editor-In-Chief
