TY - CHAP AU - Ahmed, Manaf Noofal Taha AU - Bencs, Péter TI - A járműfűtési és -szellőztetési rendszerek fejlesztési technikáinak áttekintése T2 - Villamosenergia-felhasználást optimalizáló innovatív rendszer fejlesztése ipari-, lakossági fogyasztók és elektromos járművek számára 2024 konferencia kiadványa PB - Miskolci Egyetem Gépészmérnöki és Informatikai Kar, Fizikai és Elektrotechnikai Intézet, Elektrotechnikai és Elektronikai Intézeti Tanszék CY - Miskolc SN - 9789633583340 PY - 2024 SP - 5 EP - 14 PG - 10 UR - https://m2.mtmt.hu/api/publication/34803134 ID - 34803134 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kovács, Endre AU - Khayrullayev, Husniddin TI - Numerical performance of some positivity preserving methods for the diffusion equation where the diffusion coefficient depends on both time and space JF - INTERNATIONAL JOURNAL OF ADVANCED NATURAL SCIENCES AND ENGINEERING RESEARCHES J2 - INT J ADV NAT SCI ENG RES VL - 8 PY - 2024 IS - 2 SP - 284 EP - 292 PG - 9 SN - 2980-0811 UR - https://m2.mtmt.hu/api/publication/34785786 ID - 34785786 LA - English DB - MTMT ER - TY - JOUR AU - Iskandar, Alaa AU - Kovács, Béla TI - Investigating the Impact of Curriculum Learning on Reinforcement Learning for Improved Navigational Capabilities in Mobile Robots JF - INTELIGENCIA ARTIFICIAL J2 - Intel Artif VL - 27 PY - 2024 IS - 73 SP - 163 EP - 176 PG - 14 SN - 1137-3601 UR - https://m2.mtmt.hu/api/publication/34757573 ID - 34757573 LA - English DB - MTMT ER - TY - JOUR AU - Nagy, Antal AU - Kundrák, János TI - Roughness of Face-Milled Surface Topography in Directions Relative to the Feed Movement JF - MANUFACTURING TECHNOLOGY J2 - MANUFAC TECHN VL - 24 PY - 2024 IS - 2 SP - 1 EP - 15 PG - 15 SN - 1213-2489 DO - 10.21062/mft.2024.024 UR - https://m2.mtmt.hu/api/publication/34755555 ID - 34755555 LA - English DB - MTMT ER - TY - JOUR AU - OMLE, ISSA AU - Kovács, Endre TI - Evaluate Recent Numerical Methods for Long-Term Simulation to Study the Effect of Different Shapes of Thermal Bridges in Walls JF - ADVANCED ENGINEERING FORUM J2 - ADVANCED ENGINEERING FORUM PY - 2024 SP - 1 EP - 14 PG - 14 SN - 2234-9898 UR - https://m2.mtmt.hu/api/publication/34755554 ID - 34755554 LA - English DB - MTMT ER - TY - JOUR AU - Khayrullayev, Husniddin AU - OMLE, ISSA AU - Kovács, Endre TI - Systematic Investigation of the Explicit, Dynamically Consistent Methods for Fisher’s Equation JF - COMPUTATION J2 - COMPUTATION VL - 12 PY - 2024 IS - 3 PG - 19 SN - 2079-3197 DO - 10.3390/computation12030049 UR - https://m2.mtmt.hu/api/publication/34732852 ID - 34732852 AB - We systematically investigate the performance of numerical methods to solve Fisher’s equation, which contains a linear diffusion term and a nonlinear logistic term. The usual explicit finite difference algorithms are only conditionally stable for this equation, and they can yield concentrations below zero or above one, even if they are stable. Here, we collect the stable and explicit algorithms, most of which we invented recently. All of them are unconditionally dynamically consistent for Fisher’s equation; thus, the concentration remains in the unit interval for arbitrary parameters. We perform tests in the cases of 1D and 2D systems to explore how the errors depend on the coefficient of the nonlinear term, the stiffness ratio, and the anisotropy of the system. We also measure running times and recommend which algorithms should be used in specific circumstances. LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Judit AU - Gáspár, Marcell Gyula AU - Lukács, János AU - Tervo, H. AU - Kaijalainen, A. TI - Comparative study about the results of HAZ physical simulations on different high-strength steel grades JF - WELDING IN THE WORLD J2 - WELD WORLD PY - 2024 PG - 16 SN - 0043-2288 DO - 10.1007/s40194-024-01714-8 UR - https://m2.mtmt.hu/api/publication/34685681 ID - 34685681 AB - With continuous improvements, structural steels are available in even higher strength grades above 1000 MPa yield strength. As the great majority of these steels are used in welded structures, their weldability needs to be taken into account. Several factors can cause difficulties during welding of these steels, but in this paper the softening behavior and the toughness characteristics of the heat-affected zone (HAZ) are examined. As the critical parts of the HAZ in a real welded joint are relatively small, their investigating ability is limited. However, the physical simulation provides a way of evaluating specimens made from a given material to produce the specified HAZ areas in a suitable size range for subsequent testing. In this research work, three different strength categories of high-strength structural steels (with yield strength of 960 MPa, 1100 MPa, and 1300 MPa) are investigated by physical simulation. In the case of different technological variants of gas metal arc welding (GMAW) process, the effect of the cooling time t 8/5 is investigated in different HAZ subzones considered to be critical. The thermal cycles were determined according to the Rykalin 3D model. The investigated cooling times were t 8/5 = 5 s, 15 s, and 30 s. The properties of the selected coarse-grained, intercritical and intercritically reheated coarse-grained zones are analyzed by laser scanning microscope, scanning electron microscope, hardness test, and instrumented Charpy V-notch impact toughness test. Furthermore, additional investigation like JMatPro calculations, electron backscatter diffraction measurements, and prior austenite grain size calculation were carried out. As a result of the tests, the investigated heat-affected subzones indicated higher sensitivity to the welding heat input compared to conventional structural steels. Overall, the results of the tests show that the application of shorter t 8/5 cooling time can be beneficial for the investigated high-strength steel grades, since significant toughness reduction and the risk of softening occur in the whole cooling time range. LA - English DB - MTMT ER - TY - JOUR AU - Mortda Mohammed Sahib, Mortda AU - Kovács, György TI - Multi-objective optimization of composite sandwich structures using Artificial Neural Networks and Genetic Algorithm JF - RESULTS IN ENGINEERING J2 - RESULT ENGIN VL - 21 PY - 2024 PG - 14 SN - 2590-1230 DO - 10.1016/j.rineng.2024.101937 UR - https://m2.mtmt.hu/api/publication/34676682 ID - 34676682 LA - English DB - MTMT ER - TY - THES AU - Spisák, Bernadett TI - Repedésterjedési esetek modellezése lokális tönkremeneteli kritériumok alapján PY - 2024 UR - https://m2.mtmt.hu/api/publication/34576102 ID - 34576102 LA - Hungarian DB - MTMT ER - TY - JOUR AU - AL-JANABI, HUMAM KAREEM JALGHAF AU - Kovács, Endre TI - Simulation of phase change materials in building walls using effective heat capacity model by recent numerical methods JF - JOURNAL OF ENERGY STORAGE J2 - J ENERGY STORAGE VL - 83 PY - 2024 PG - 16 SN - 2352-152X DO - 10.1016/j.est.2024.110669 UR - https://m2.mtmt.hu/api/publication/34556581 ID - 34556581 LA - English DB - MTMT ER -