MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL

https://mesj.ukim.edu.mk/journals/issue/feed MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL 2022-02-20T00:59:46+01:00 Open Journal Systems MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL (MESJ) provides a rapid forum for the dissemination of original research and review articles related to the scientific methods in engineering and technology. It is a peer reviewed international journal published twice annually (for the time-being) using an open access publication model. The journal aim is to foster research in the fields of science, engineering and technology, as well as to provide review coverage of the technical developments that shape our world. It is devoted to publication of original research articles, related to theory and/or applications that have not been published (or submitted simultaneously), at any language, elsewhere. Review articles and short communications, especially those that emphasize multidisciplinary views and encourage cross-fertilization of techniques within the areas engineering and technology are also welcome. MESJ publishes papers on new results and methods that hold prospect for substantial progress in all areas of engineering and technology. The Journal has been published for the last 30 years. The Journal has a distinguished Editorial Board with extensive academic qualifications, ensuring that it will maintain high scientific standards and broad international coverage. https://mesj.ukim.edu.mk/journals/article/view/20 639.HYDRAULIC LOADER CRANE – OPERATOR WORKPLACE RISK ASSESSMENT 2022-02-20T00:58:59+01:00 Zelic Atila mail@mail.com Zivanic Dragan mail@mail.com Ilankovic Nikola ilankovic@uns.ac.rs Katona Mirko mail@mail.com Jakimovska Kristina kristina.jakimovska@mf.edu.mk Vasileva Anita mail@mail.com Antic Natasa mail@mail.com

The aim of this paper is to assess the risk to health and safety at work while working with a hydraulic crane mounted on a truck. After the risk assessment, appropriate preventive measures for healthy and safety of work are prescribed, together with a short manual on health and safety at work. The expert finding of the hydraulic loader crane was processed according to the Ordinance on the Manner and Procedure of Risk Assessment at the Workplace and in the Work Environment (Official Gazette of Republic of Serbia, no. 114/2014 and 102/2015).

2021-12-18T00:00:00+01:00 Copyright (c) 2021 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/21 640.DESIGN OF ESCALATORS AND FOLLOWING SAFETY MEASURES 2022-02-20T00:59:08+01:00 Zivanic Dragan mail@mail.com Ilankovic Nikola ilankovic@uns.ac.rs Zelic Atila mail@mail.com Katona Mirko mail@mail.com Jakimovska Kristina kristina.jakimovska@mf.edu.mk Vasileva Anita mail@mail.com

Transport of people in buildings and at relatively short distances is possible by escalators. Escalators have a great application in the transport of the people and they represent an important part of vertical transport. As escalators are used at all ages, it is necessary to design them to be safe. Due to the large number of moving parts and the complicated construction of the escalator, it is necessary to perform periodic checks and controls of their correctness and safety for the transport of people. The paper gives an overview of the basic elements of escalators, and some potential dangers and appropriate safety measures for their prevention.

2021-12-18T00:00:00+01:00 Copyright (c) 2021 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/22 641.PERFORMANCES OF THE ELECTRIC VEHICLES WITH DIFFERENT CHARGING METHODS 2022-02-20T00:59:16+01:00 Jakimovska Kristina kristina.jakimovska@mf.edu.mk Vasileva Anita mail@mail.com Bartlomiejczyk Mikolaj mail@mail.com

Since the world pollution has been increased, the need for eco-solutions is alarming. One solution is electric vehicles, which have been rapidly developed in recent years. Those vehicles are energy efficient and emission free, but the initial costs can be much higher in comparison to other vehicles. This paper would focus on the methods of charging power and battery requirements as well as energy consumption. Analyzing the methods of charging for achieving environmentally friendly cities, as well as comparisons between the methods will greatly support the development of strategies for achieving zero emissions.

2021-12-18T00:00:00+01:00 Copyright (c) 2021 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/23 642.ANALYSIS OF FREE SURFACE FLOW IN PELTON TURBINE USING LATTICE BOLTZMANN METHOD 2022-02-20T00:59:22+01:00 Lipej Andrej andrej.lipej@fs-unm.si

Computational fluid dynamics (CFD) has become an indispensable tool in the development and optimization of various machines and devices in the last decade. In most cases, researchers deal with single-phase flows and internal flows where all externally wetted walls are defined. In some cases, it is also necessary to analyze multiphase flow and free-surface flow. Using classical numerical methods such as the finite element method (FEM) or the finite volume method (FVM), the results are highly dependent on the size and quality of the computational grids. Particular attention should be paid to the conditions at the boundary between the individual phases of the fluid. In most cases, it is necessary to consider non-stationary conditions and the necessity of using non-stationary numerical methods. All the above properties of multiphase flows and their consequences in performing numerical analyses lead us to very long computational times and consequently the use of very powerful computers. Industry often needs results in a relatively fast time therefore many simplifications need to be considered. Recently a new approach for numerical simulations of multiphase and free-surface flows based on the Lattice Boltzmann method (LBM) started to be used. The method is very useful especially for development of small-scale hydraulic turbines, where the expense for development process is usually very limited. In this paper, some examples of the use of LBM in the calculation of free-surface flows and compare the results using classical CFD methods have been presented.

2021-12-18T00:00:00+01:00 Copyright (c) 2021 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/24 643.ECONOMY AND POWER TUNING AN IC ENGINE FOR LOWER CO2 FOOTPRINT 2022-02-20T00:59:29+01:00 Manev Nikola manev.nikola@yahoo.com Dimitrovski Dame dame.dimitrovski@mf.edu.mk Mirakovski Zoran mail@mail.com Jovcevski Igor mail@mail.com

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