MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL

https://mesj.ukim.edu.mk/journals/issue/feed MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL 2022-06-28T00:00:00+02:00 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/68 644.EVALUATION OF THE UNCERTAINTY CONTRIBUTION OF THE NATURAL THERMOCOUPLE CHARACTERISTICS IN THE EMPIRICAL MODELLING OF TEMPERATURE DURING METAL CUTTING PROCESS 2022-06-10T16:20:32+02:00 Trajčevski Neven neven.trajchevski@ugd.edu.mk Tomov Mite neven.trajchevski@ugd.edu.mk Kuzinovski Mikolaj neven.trajchevski@ugd.edu.mk Stevanoski Goce neven.trajchevski@ugd.edu.mk

This paper gives a recommendation of including the measurements uncertainty contribution of the natural thermocouple characteristics in the process of empirical modelling of the average temperature during machining process by turning. It is proposed that the calculated uncertainty value of this source should be a part of the overall uncertainty budget of the coefficients/degrees of the resulting power empirical model. The paper includes results of an example where thermo-voltage vs. temperature recordings of the natural thermocouple were analyzed by the proposed approach.

2022-06-28T00:00:00+02:00 Copyright (c) 2022 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/69 645.DESIGN AND MANUFACTURING OF 3D PRINTED PARTS FOR RADIOTHERAPY APPLICATION 2022-06-10T16:20:40+02:00 Jakupi Kaltrine g.hodolli@uni-pr.edu Vrtanoski Gligorče g.hodolli@uni-pr.edu Dukovski Vladimir g.hodolli@uni-pr.edu Hodolli Gezim g.hodolli@uni-pr.edu

The purpose of this study was to apply an additive manufacturing method to create the bolus, which was estimated to increase the homogeneity and absorbed dose of the planning target volume when they are located on superficial region and be treated with high-energy photons beams. For this reason a patient with diagnosis: “Ca. Cutis exulcerans region frontalis lat. sin.” was simulated on computer tomography (CT), then a personal bolus was designed and printed with thermoplastic material, polylactic acid (PLA). For quality comparison purposes an identical treatment plan was prepared with and without printed bolus. The dosimetric evaluation shows that 4% of the delivered dose will be higher when printed bolus was applied. This additional dose made a big difference in favor of quality treatment of the patient and operational costs for bolus printing and application are negligible related to treatment benefits.

2022-06-28T00:00:00+02:00 Copyright (c) 2022 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/70 646.ANALYSIS OF ADDITIVE MANUFACTURING TECHNOLOGY INPUT PARAMETERS IN MANUFACTURING OF BOLUS 2022-06-10T16:20:51+02:00 Jakupi Kaltrine vladimir.dukovski@mf.edu.mk Dukovski Vladimir vladimir.dukovski@mf.edu.mk Kočov Atanas vladimir.dukovski@mf.edu.mk

This paper presents the design and production of bolus with additive manufacturing technology for a specific patient in routine radiation therapy. The patient face was simulated with the Computer Tomography (CT) and then the bolus was designed with Computer Aid Designed (CAD) software, 3D Slicer. The bolus was segmented for radiotherapy needs but the head was also segmented only for illustration reasons. For slicing of 3D models were used PrusaSlicer software. All inputs parameters of printing were chosen by the quality of printing and the purpose of use. The ‘G-code’ was created for printing. The printing is done with the Fused Deposition Modeling (FDM) additive manufacturing and Polylactic Acid (PLA). The printer was calibrated and used in accordance with the producer manual. This technique shows many advantages like the precision of model printing, short production time, cheap production, and higher dosimetric benefits for dose distribution of the patient.

2022-06-28T00:00:00+02:00 Copyright (c) 2022 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/71 647.DESIGN AND IMPROVEMENT OF A REUSABLE BOTTLE FOR SPORTS DRINKS USING VIRTUAL TESTING AND VALIDATION 2022-06-10T16:20:59+02:00 Jovčevska Ana ile.mircheski@mf.edu.mk Kralevski Leo ile.mircheski@mf.edu.mk Ile Mirčeski ile.mircheski@mf.edu.mk

This paper presents the design process of an ergonomic reusable bottle for sports drinks using virtual testing and validation. The main goal was doing research in the field of already existing sports bottles, as well as creating a new and innovative sport’s bottle design which implements good ergonomic principles and requirements. Some light is shone on the use of material, and the product manufacturing process, all with a goal to create a product which is of good quality, great performance and affordable price. A crucial point in the research is the virtual validation. The 3D model of the bottle design, as well as the core and cavity moulds, and the product simulation were created in the software SolidWorks. A further analysis was made using the software CATIA and Human Builder, to ergonomically analyze and verify said ergonomic reusable bottle.

2022-06-28T00:00:00+02:00 Copyright (c) 2022 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/72 648.BIO-INSPIRED KINETIC STRUCTURES 2022-06-10T16:21:08+02:00 Janura Mark mark_janura@hotmail.com Sidorenko Sofija mark_janura@hotmail.com Mirčeski Ile mark_janura@hotmail.com Iliev Viktor mark_janura@hotmail.com Angeleska Elena mark_janura@hotmail.com

The goal of this paper is to contribute to the design and study of forms driven by natural forces. The research is based on the application of three disciplines: bionics, kinetics and modular design. The principles of these interdisciplinary studies are applied and verified in the development of a reactive, aerodynamic, wind turbine blade profile. Several variants of nature-inspired shapes and modular kinetic structures are offered, analyzed and tested in order to optimize the design and reach maximum aerodynamics of the blade and the best performance under the influence of wind. The final tests of the blade are conducted using an open-air tunnel. The created blade profile could be applied in various products with possibility of moving under the influence of wind, rain, sea waves, etc. The shape and structure could be used in designing industrial products, architectural and artistic objects, but also in the design of complex engineering solutions.

2022-06-28T00:00:00+02:00 Copyright (c) 2022 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/73 649.CHARACTERIZATION OF THE COASTAL SEDIMENT FROM THE RIVER OF VARDAR, RIGHT BEFORE THE CONFLUENCE WITH THE TRESKA RIVER 2022-06-10T16:21:18+02:00 Šiškova Tajana tajana@tmf.ukim.edu.mk Čankulovska Andrijana tajana@tmf.ukim.edu.mk Ruseska Gordana tajana@tmf.ukim.edu.mk Boškovski Boško tajana@tmf.ukim.edu.mk Bogoevski Slobodan tajana@tmf.ukim.edu.mk

This study was based on the characterization of the coastal sediment from the river of Vardar, right before the confluence with the Treska river. The mineralogical composition of the river sediment was determined by X-ray analysis. The granulometric distribution of the grains from the river sediment was determined as a basic parameter that has an impact on its physical properties. A microscopic observation on various dimensional fractions of the grains were performed. The porosity and capillary system of the river sediment in correlation with the structure was defined. The transfer of moisture horizontally and vertically from the water line was examined. Therefore, the heat transfer was monitored by measuring the temperature at various depths (0, 5, 10 and 15 cm) and various distances (1, 1.5 and 2 m) from the river water line. The properties of the river sediment are affected by the deposited minerals and organic material from the river basin, as well as horizontal and vertical transfer of moisture and heat.

2022-06-28T00:00:00+02:00 Copyright (c) 2022 MECHANICAL ENGINEERING – SCIENTIFIC JOURNAL https://mesj.ukim.edu.mk/journals/article/view/74 650.SIMULTANEOUS MONITORING OF THE SOIL’S PARAMETERS IN MICROLOCALITY NEAR THE SKOPJE VALLEY 2022-06-10T16:21:27+02:00 Čankulovska Andrijana andrijana@tmf.ukim.edu.mk Šiškova Tajana andrijana@tmf.ukim.edu.mk Boškovski Boško andrijana@tmf.ukim.edu.mk Slobodan Bogoevski andrijana@tmf.ukim.edu.mk

The soil is a natural medium formed on the Earth’s surface. The pedogenic factors have an influence on structure, composition and properties of the soil. As an open system the soil has continuous transfer of energy and matter from the atmosphere. In this research, the temperature and moisture of the agricultural soil from southern slope of the mountain of Skopska Crna Gora were monitored. The measurements of the soil parameters were realized at different periods of the day (8, 11, 14, and 17 h) at various soil depths (0, 5, 10, 15, and 20 cm). In addition, the atmospheric parameters were monitored as well. The soil was characterized by X-ray, mineralogical, granulometric and physico-chemical analysis. Consequently, the impact of the atmospheric conditions upon the soil parameters was studied, in correlation with structure, composition and properties of the soil.

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