Faculty of Mechanical Engineering
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Item type:Publication, Hardering alloys for excavator teeth coating(Centre for Evaluation in Education and Science (CEON/CEES), 2024)M. Poser, F. Zdraveski, M. Petreski, M. Pavlović, V. JeremićThe capacity of the rotоr excavator depends to a significant extent on the backet teeth. Abrasive wear of cutting teeth and cutting edges is typical when digging sand, sandy clay and gravel in common rock environments. Of particular importance is the contribution of the correct geometry of the teeth, their position on the backet, and especially their sharpness, which they lose over time. Over time, teeth become blunt due to abrasive wear and their geometry changes. The digging resistance becomes greater, and therefore the efficiency of the rotor excavator decreases. White cast iron stands out as a base alloy that has wear resistance, but has very low toughness and often brittle fracture under impact loads. Manganese steel, although it has the property of deformation strengthening, has no wear resistance when digging in sand. This condition can be improved by choosing a material more resistant to abrasive action. Excavator teeth that fail due to abrasive wear can be protected from abrasive wear by the use of hardface coating. These hardfacing alloys are presented in this paper. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, DYNAMIC STIFFNESS OF HIGH SPEED CUTTING (HSC) LINEAR MOTOR MACHINE TOOL(Editura Politehnica, 2024)Zoran PANDILOVIn this paper a model of the feed drive system with disturbance force for High Speed Cutting (HSC) linear motor machine tool tool is given. The dynamic stiffness for the proposed model is analysed. A simulation of the influence of some parameters on feed drive dynamic stiffness is performed with the simulation program MATLAB & SIMULINK. Correctness of the proposed model is verified with an experimental measurement of the dynamic stiffness of the feed drive on the prototype HSC linear motor machine tool (HSC 11) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of laser beam and arc power on weld bead geometry in hybrid laser arc welding of structural steel(Centre for Evaluation in Education and Science (CEON/CEES), 2024); ; Stankoski, Marko<jats:p>Hybrid Laser Arc Welding - HLAW combines the advantages of Laser Beam Welding - LBW and Gas Metal Arc Welding - GMAW, resulting in a welding process of high welding speed, less heat input, deeper penetration into the welding material, and increased process efficiency compared to conventional welding processes. The merger of the two heat sources, laser beam and arc, in a single welding process leads to a weld joint characterized by two zones, an upper-wide zone or laser-arc zone and a lower narrow zone or laser zone. This study investigates the impact of laser beam and arc currents on the weld bead geometry in the arcleading hybrid laser arc welding process of 12 (mm) structural steel. Through systematic experimentation, single-pass hybrid laser arc welds were performed in a butt joint configuration with zero-gap at various power settings, laser beam power range 10 - 13 (kW), and arc current range 340 - 400 (A) to determine their influence on weld bead width, height, and depth. The quality level of the hybrid laser arc welds was evaluated according to ISO 12932. The results indicate that increasing laser beam power enhances weld bead depth and narrows bead width, while the arc current is directly related to weld bead height and overall smoothness. The findings show that weld bead geometry is a function of laser beam and arc power ratio, an increased ratio leads to a narrow weld bead and vice versa.</jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Visualisation of autonomouos vehicle interior in virtual reality(Serbian Society for Geometry and Graphics (SUGIG) Faculty of Mechanical Engineering, University of Belgrade, 2023); ; Angeleska, ElenaIn this paper we present the visualisation process of autonomous vehicle interior using virtual reality (VR). Autonomous vehicles are providing designers with more freedom in the design, since some traditional elements like driver position and controls are not needed. In addition, the autonomous vehicles are usually envisioned as a form of urban public transport in the future, meaning their interior should be designed to accommodate several passengers. The use of 3D models and renders is suitable for presenting the design of the interior of these vehicles, but the sense of space volume and ergonomics are not well presented. Using VR, we can provide full immersion of the user, providing the ability to completely visualize the interior of the vehicle. In addition, using game engines we are able to provide a complete virtual experience of the autonomous ride in an urban environment. In that way, visualisation in VR could be used to verify the design methodology utilized in the design process and verify the utilized interior design ergonomic standards. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modeling and Prototyping of Self-Folding Origami Structure(American Society of Mechanical Engineers, 2019-09-09);