TY - JOUR AU - Kuti, Rajmund AU - Könczöl, F. AU - Csapó, L. AU - Papp, Csenge AU - Földi, László AU - Tóth, Álmos Dávid TI - Selection of engine oils with tribological examinations applicable to specially operated diesel engines JF - FME TRANSACTIONS J2 - FME TRANS VL - 52 PY - 2024 IS - 2 SP - 335 EP - 342 PG - 8 SN - 1451-2092 DO - 10.5937/fme2402335K UR - https://m2.mtmt.hu/api/publication/34824304 ID - 34824304 AB - In recent times, many specially engineered diesel engines built in the 1980s are still used in different areas, for which the suggested engine oils are no longer available. These engines are operated reliably in military combat vehicles, electricity generators, and tracked machinery, thus it is essential to examine what engine oils are suitable for their operating conditions and may be used as their engine oil. The aim of our research is to conduct the tribological examination of an oil sample taken from a V-6M type naturally aspirated Diesel engine and the oil prescribed by the manufacturer. After evaluating the results, we determine which type of oil is applicable in the engine to achieve safe operation and a long lifetime. LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Flóra AU - Beke, Dóra AU - Hajdu, Csaba AU - Környei, László AU - Kuti, Rajmund TI - Erdőtűz talajra gyakorolt hatásainak vizsgálata számítógépes szimulációval II. - Nyári tűz JF - TŰZVÉDELEM VL - 2024 PY - 2024 IS - 2 SP - 4 EP - 7 PG - 4 SN - 2939-8916 UR - https://m2.mtmt.hu/api/publication/34795874 ID - 34795874 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Brinissat , Marame AU - Ray, Richard AU - Kuti, Rajmund TI - Predicting multi-span bridge maximum deflection: Numerical simulation and validation JF - IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING J2 - IOP CONF SER MATER SCI ENG VL - 1304 PY - 2024 IS - 1 SN - 1757-8981 DO - 10.1088/1757-899X/1304/1/012016 UR - https://m2.mtmt.hu/api/publication/34774556 ID - 34774556 AB - Deflection is one of the main parameters often required to reflect and monitor the overall health state of bridge structures. Several approaches have been developed to monitor deflection accurately and economically. This research proposes a theoretical method to estimate the maximum deflection of the longest section of a seven-span continuous bridge using stress data collected through strain gauges. Firstly, initial data were collected from field tests under various controlled loadings to obtain the maximum deflections and stresses. Then, the stress-deflection regression equations are derived to reconstruct deflection from estimated gauges. Finally, the maximum deflection values are compared with analytical results using finite element simulations to verify the method’s effectiveness. LA - English DB - MTMT ER - TY - JOUR AU - Brinissat , Marame AU - Ray, Richard AU - Kuti, Rajmund TI - Multi-Span Box Girder Bridge Sensitivity Analysis in Response to Damage Scenarios JF - BUILDINGS J2 - BUILDINGS-BASEL VL - 14 PY - 2024 IS - 3 SN - 2075-5309 DO - 10.3390/buildings14030667 UR - https://m2.mtmt.hu/api/publication/34719913 ID - 34719913 AB - Due to their distinct features, including structural simplicity and exceptional load-carrying capacity, steel box girder bridges play a critical role in transportation networks. However, they are categorized as fracture-critical structures and face significant challenges. These challenges stem from the overloading and the relentless effects of corrosion and aging on critical structural components. As a result, these bridges require thorough inspections to ensure their safety and integrity. This paper introduces generalized approaches based on vibration-based structural health monitoring in response to this need. This approach assesses the condition of critical members in a steel girder bridge and evaluates their sensitivity to damage. A rigorous analytical evaluation demonstrated the effectiveness of the proposed approach in evaluating the Szapáry multi-span continuous highway bridge under various damage scenarios. This evaluation necessitates extensive vibration measurements, with piezoelectric sensors capturing ambient vibrations and developing detailed finite element models of the bridge to simulate the structural behavior accurately. The results obtained from this study showed that bridge frequencies are sufficiently sensitive for identifying significant fractures in long bridges. However, the mode shape results show a better resolution when compared to the frequency changes. The findings are usually sensitive enough to identify damage at the affected locations. Amplitude changes in the mode shape help determine the location of damage. The modal assurance criterion (MAC) served to identify damage as well. Finally, the results show a distinct pattern of frequency and mode shape variations for every damage scenario, which helps to identify the damage type, severity, and location along the bridge. The analysis results reported in this study serve as a reference benchmark for the Szapáry Bridge health monitoring. LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Flóra AU - Beke, Dóra AU - Hajdu, Csaba AU - Környei, László AU - Kuti, Rajmund TI - Az erdőtűz talajra gyakorolt hatásainak vizsgálata számítógépes szimulációval I. - Modellek vizsgálata JF - TŰZVÉDELEM VL - 31 PY - 2024 IS - 1 SP - 5 EP - 8 PG - 4 SN - 2939-8916 UR - https://m2.mtmt.hu/api/publication/34568811 ID - 34568811 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Hajdu, Flóra AU - Környei, László AU - Kuti, Rajmund TI - One-at-a-Time sensitivity study of a tree burning simulation JF - POLLACK PERIODICA: AN INTERNATIONAL JOURNAL FOR ENGINEERING AND INFORMATION SCIENCES J2 - POLLACK PERIODICA VL - 19 PY - 2024 IS - 1 SP - 53 EP - 59 PG - 7 SN - 1788-1994 DO - 10.1556/606.2023.00850 UR - https://m2.mtmt.hu/api/publication/34205975 ID - 34205975 AB - The aim of the research was to carry out the One-at-a-Time sensitivity analysis of a tree burning experiment simulation with a novel fuzzy logic-based method. It was observed that the precent of the remaining tree is sensitive to the moisture content, the crown-base diameter and the tree height. The other variables, which are maximum mass loss rate, maximum heat release rate, and maximum temperature at the top of the tree are moderately sensitive or not sensitive to the selected parameters. The presented results can be used in sensitivity studies and wildfire simulations. LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Flóra AU - Mika, Péter AU - Szalai, Péter AU - Kuti, Rajmund TI - Road Profile Modelling Based on Measurement for Fire Truck Simulation JF - MŰSZAKI KATONAI KÖZLÖNY J2 - MŰSZAKI KATONAI KÖZL VL - 33 PY - 2023 IS - 4 SP - 117 EP - 130 PG - 14 SN - 1219-4166 DO - 10.32562/mkk.2023.4.9 UR - https://m2.mtmt.hu/api/publication/34750219 ID - 34750219 AB - The unevenness of the road reduces the life of the vehicle’s suspensions, and the resulting harmful vibrations can also lead to the failure of other structures. In case of special superstructures like fire trucks, valuable firefighting equipment can also be damaged. Since there is little available literature dealing with the vibrations generated during the use of firefighting vehicles, in this research work a real road profile based on data from geodetic measurements was generated for numerical simulation. The suspension of the vehicle taking into account the parameters of a heavy-duty firefighting vehicle was also modelled, and then the effects of road failures using computer simulation were investigated. The road profile was implemented in the simulations with spline polynomials and the fire truck was simulated as a full vehicle model. The aim of the research is to compare the achieved simulation results with data from other vehicle research studies, thereby achieving more accurate results that can also be applied in practice, contributing to vehicle design and safe operation. LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Flóra AU - Hajdu, Csaba AU - Beke, Dóra AU - Környei, László AU - Kuti, Rajmund TI - Numerical Examination of a Forest Area Fire JF - CHEMICAL ENGINEERING TRANSACTIONS J2 - CHEM ENG TR VL - 107 PY - 2023 SP - 61 EP - 66 PG - 6 SN - 1974-9791 DO - 10.3303/CET23107011 UR - https://m2.mtmt.hu/api/publication/34477845 ID - 34477845 LA - English DB - MTMT ER - TY - JOUR AU - Apagyi, Antal AU - Kuti, Rajmund AU - Papp, Csenge TI - Combustion Gas Examination of a Battery Housing in Electrically Driven Heavy Goods Vehicle JF - ACADEMIC AND APPLIED RESEARCH IN MILITARY AND PUBLIC MANAGEMENT SCIENCE J2 - AARMS (2014 VOL.13 ISSUE 2 -TŐL) VL - 22 PY - 2023 IS - 3 SP - 77 EP - 90 PG - 14 SN - 2498-5392 DO - 10.32565/aarms.2023.3.5 UR - https://m2.mtmt.hu/api/publication/34345724 ID - 34345724 AB - Nowadays, electrically propelled vehicles are becoming more and more popular. Due to the propulsion system, the risks derived from the operation have changed, compared to the conventionally driven vehicles. The investigated vehicle has the same, new risk factor originating from the behaviour of rechargeable energy storage system (RESS) during combustion and there is only a minority of available literature dealing with the investigation of the battery housing. According to our assumption the housing is a fire comburent material that hinders the work of first responders. In this research we conducted the laboratory examination of a prismatic LiFePO4 battery cell and battery pack cover used in electrically driven vehicles during burning. Combustion gases were collected and were evaluated with the help of gas chromatography. Our results show that plastic housing and cell covers are not recommended in automotive industrial use, because of their comburent characteristics, also the combustion gases are severely harmful. This paper includes the method of sampling, the experiment itself and the results. LA - English DB - MTMT ER - TY - JOUR AU - Horváth, Péter AU - Hajdu, Flóra AU - Szalai, Péter AU - Papp, Csenge AU - Apagyi, Antal AU - Brinissat , Marame AU - Major, Zoltán AU - Kuti, Rajmund TI - Investigation of Traffic Induced Dynamic Response of a Bridge JF - STROJNICKY CASOPIS / JOURNAL OF MECHANICAL ENGINEERING J2 - STROJNICKY CASOPIS VL - 73 PY - 2023 IS - 1 SP - 85 EP - 102 PG - 18 SN - 0039-2472 DO - 10.2478/scjme-2023-0007 UR - https://m2.mtmt.hu/api/publication/33909208 ID - 33909208 AB - Bridges are special structures that provide a transport connection between areas divided by a physical barrier. Vehicles passing over bridges cause vibrations in the structural elements of the bridge, which can damage these structural elements over time. The aim of our research was to investigate the vibrations generated by vehicles on Hungary’s first steel girder welded bridge, which was subjected to the maximum allowable load. In this paper, we describe the measurements we have carried out, analyse the results, present the vehicle-bridge interaction model we have constructed and the computer simulation we have carried out by using it. Our research results are intended to contribute to accident prevention and the safe operation of bridges. LA - English DB - MTMT ER -