TY - CONF AU - Nagy, Vanda Orsolya AU - Budai, Csaba ED - Barabás, István TI - A mintavételezés hatása a mechatronikai rendszerek rezgési tulajdonságaira T2 - OGÉT 2025 - XXXIII. Nemzetközi Gépészeti Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Nagyvárad T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 33. PY - 2025 SP - 380 EP - 385 PG - 6 UR - https://m2.mtmt.hu/api/publication/36154543 ID - 36154543 LA - Hungarian DB - MTMT ER - TY - CONF AU - Leitold, László AU - Cseppentő, Bence AU - Kollár, Zsolt TI - Development of an Efficient and Fast Computational Tool for Multi-Precision Floating Point Numbers T2 - Proceedings of the IEEE 35th International Conference Radioelektronika PB - IEEE C1 - Piscataway (NJ) SN - 9798331544478 T3 - Proceedings of International Conference Radioelektronika, ISSN 2993-2165 PY - 2025 SP - 155 EP - 159 PG - 5 UR - https://m2.mtmt.hu/api/publication/36153765 ID - 36153765 LA - English DB - MTMT ER - TY - JOUR AU - Kocsis, G. AU - Bartók, G. AU - Buzás, A. AU - Cseh, G. AU - Dunai, D. AU - Gárdonyi, Gábor AU - Hegedűs, S. AU - Málics, M. AU - Nagy, D. AU - Réfy, D. AU - Szepesi, T. AU - Vavrik, M. AU - Walcz, E. AU - Zoletnik, S. AU - Jachmich, S. AU - Kruezi, U. AU - Lehnen, M. TI - Pellet fragmentation studies for the ITER disruption mitigation system JF - FUSION ENGINEERING AND DESIGN J2 - FUSION ENG DES VL - 217 PY - 2025 PG - 7 SN - 0920-3796 DO - 10.1016/j.fusengdes.2025.115132 UR - https://m2.mtmt.hu/api/publication/36146705 ID - 36146705 N1 - The work has been performed as part of the ITER DMS Task Force program. The DMS Support Laboratory has received funding from the ITER Organization. AB - The thermal and mechanical loads during disruptions are a major threat for large reactor-class tokamak devices. Therefore, shattered pellet injection (SPI) is selected as the baseline technology for the ITER Disruption Mitigation System (DMS). The aim of DMS Support Laboratory located at the HUN-REN Centre for Energy Research is to study the production, launch and shattering of cryogenic protium, deuterium, and neon pellets in the ITER geometry. This paper reports on the fragment analysis procedure and the first results of the fragment plume investigation performed with pellets made of the above materials and accelerated to a speed ranging between 70 and 500m/s. The experimental results show that the fragment plume consists of macroscopic and microscopic fragments. The shattering of about 500 m/s protium and deuterium pellets resulted in a most common fragment size of a few millimeters, while at lower velocities around 250m/s still the same few millimeters size fragments dominate but larger fragments have a higher proportion in the mass distribution. At low velocities (70 m/s) for neon pellets most of the pellet mass was converted into large fragments (from 10 to 20 mm). The results are also compared with the Parks pellet fragmentation model. © 2025 LA - English DB - MTMT ER - TY - JOUR AU - Haba, Tamás AU - Budai, Csaba TI - Determining the intersample response of state feedback control systems using boundary value problems JF - BOUNDARY VALUE PROBLEMS J2 - BOUND VALUE PROBL VL - 2025 PY - 2025 PG - 13 SN - 1687-2762 DO - 10.1186/s13661-025-02064-0 UR - https://m2.mtmt.hu/api/publication/36146478 ID - 36146478 N1 - Open access funding provided by Budapest University of Technology and Economics. The research reported in this paper is supported by the University Research Fellowship Program under grant number EKÖP-24-3-BME-315, funded by the National Research Development and Innovation Fund of the Ministry of Culture and Innovation. The project supported by the Doctoral Excellence Fellowship Programme (DCEP) is funded by the National Research Development and Innovation Fund of the Ministry of Culture and Innovation and the Budapest University of Technology and Economics, under a grant agreement with the National Research, Development and Innovation Office. Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. AB - This paper investigates intersample dynamics, a key aspect of sampled-data systems, as the controlled processes are usually physical systems. We present a novel, boundary value problem-based method to reconstruct the continuous-time response from the output samples in the case of state feedback control. Numerical examples and experiments on a DC motor drive show that the proposed method can reveal hidden intersample vibrations that are overlooked by discrete-time models and traditional interpolation techniques. LA - English DB - MTMT ER - TY - JOUR AU - Rácz, Kristóf AU - Seregély, Beáta AU - Kiss, Rita TI - Static Precision of Instrumented Pointers for Anatomical Landmark Calibration in CAST-Like Motion Analysis Measurements JF - ANNALS OF BIOMEDICAL ENGINEERING J2 - ANN BIOMED ENG PY - 2025 PG - 10 SN - 0090-6964 DO - 10.1007/s10439-025-03753-8 UR - https://m2.mtmt.hu/api/publication/36143427 ID - 36143427 N1 - This work was supported by the Hungarian Scientific Research Fund (OTKA), grant number: K135042, and Project no. TKP-9-8/PALY-2021, which has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-EGA funding scheme. Open access funding provided by Budapest University of Technology and Economics. AB - Purpose: The Calibrated Anatomical Systems Technique is an integral part of modern motion analysis systems. However, the calibration of anatomical landmarks is shown to have large variations in intra- and inter-examiner accuracy, which can result in both offset type errors or changes in the characteristics of joint angles and other parameters. This paper is the first instalment in a series of articles aiming to characterize and minimize all of the different factors contributing to these inconsistent calibrations by examining and optimizing the performance of the instrumented pointers used for landmark calibration. A complete characterisation of all aspects of instrumented pointer precision has not been done before. Methods: This paper focuses on examining four different pointers used with an optical OptiTrack motion capture system to establish the expected variability when measuring pointer tip location. Four different pointers were measured at three different locations within the motion capture system’s measurement volume, in a distinct orientation at each of these location. Results: A single stationary marker can be measured with less than 0.06 mm variation with 95% confidence, whilst the variation of the tip of a stationary pointer is 0.2 mm. If the pointer markers are located closer than what the motion capture system is able to resolve, these variations can more than double, but pointer geometry has limited effect on precision apart from this. Conclusion: Thanks to improvement of motion capture technology in the last 20 years, static precision is already excellent. Robustness of tracking can likely be improved, but it’s effect on overall pointer precision would be minimal and likely inconsequential. LA - English DB - MTMT ER - TY - CONF AU - Divin, Judit AU - Ágoston, Dorottya AU - Kiss, Rita ED - Barabás, István TI - Futómozgás kinematikai vizsgálata 2 és 3 dimenzióban T2 - OGÉT 2025 - XXXIII. Nemzetközi Gépészeti Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Nagyvárad T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 33. PY - 2025 SP - 149 EP - 154 PG - 6 UR - https://m2.mtmt.hu/api/publication/36131408 ID - 36131408 LA - Hungarian DB - MTMT ER - TY - CONF AU - Haba, Tamás AU - Budai, Csaba ED - Barabás, István TI - Állapot-visszacsatolással szabályozott rendszerek mintavételközi dinamikája T2 - OGÉT 2025 - XXXIII. Nemzetközi Gépészeti Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Nagyvárad T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 33. PY - 2025 SP - 195 EP - 200 PG - 6 UR - https://m2.mtmt.hu/api/publication/36130076 ID - 36130076 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Walcz, Erik AU - Budai, Csaba TI - Cryogenic properties of copper produced by Atomic Diffusion Additive Manufacturing (ADAM) JF - CRYOGENICS J2 - CRYOGENICS VL - 149 PY - 2025 PG - 7 SN - 0011-2275 DO - 10.1016/j.cryogenics.2025.104081 UR - https://m2.mtmt.hu/api/publication/36110742 ID - 36110742 AB - Atomic Diffusion Additive Manufacturing (ADAM) represents cutting-edge technology in the field of cost-effective additive manufacturing, while the vacuum tightness and thermal properties of these materials are not fully measured, especially at low, cryogenic temperatures. This study investigates the viability of utilizing ADAM for producing components intended for cryogenic heat transfer in vacuum. In this paper I will present the CryPT-ON (Cryogenic Performance Test) cryostat at the Fusion Plasma Physics Department of HUN-REN Centre for Energy Research, the specific experimental setup for thermal conductivity, diffusivity measurement and the 3D printed samples with X-ray fluorescence (XRF) and Scanning Electron Microscope (SEM) measurement to determine the material composition and have a better understanding of this special material and printing technology. LA - English DB - MTMT ER - TY - JOUR AU - Faragó, Dénes AU - Karácsony, Atilla AU - Orlovits, Zsanett AU - Pap, Károly AU - Kiss, Rita TI - Changes in the mechanical properties of tibialis anterior and peroneus longus allograft depending on sterilization method and storage time JF - BONE & JOINT RESEARCH J2 - BONE JOINT RES VL - 14 PY - 2025 IS - 3 SP - 270 EP - 280 PG - 11 SN - 2046-3758 DO - 10.1302/2046-3758.143.BJR-2024-0129.R2 UR - https://m2.mtmt.hu/api/publication/36072449 ID - 36072449 N1 - Funding Agency and Grant Number: Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP-6-6/PALY-2021] Funding text: The authors disclose receipt of the following financial or material support for the research, authorship, and/or publication of this article: Project no. TKP-6-6/PALY-2021 has been implemented with support from the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund,financed under the TKP2021-NVA funding scheme; and Project no. TKP-9-8/PALY-2021 has been implemented with support from the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-EGA funding scheme, as reported by D. Faragó and R. M. Kiss. AB - Aims he aim of the present research was to analyze the effects of different sterilization methods and storage times on the mechanical properties (load at first break, strain at first break, maximum load, strain at maximum load, and Young's modulus of elasticity) of different allografts compared to native groups. Methods Two types of grafts were harvested from human cadavers: 165 tibialis anterior (TA) and 166 peroneus longus (PL) tendons. According to the two types of sterilization methods (gamma and electron beam irradiation) or the lack of one, and the six types of storage time (one to six months), 36 groups were created. In addition, we created a 1 to 1 native group, which was not sterilized and stored, tested within four hours of collection. Results In the results of tendon type TA compared to TA native group, we observed significant differences at the fifth month of storage for all measured parameters. Load at first break of the frozen values at the fifth month was significantly inferior to the native group (p = 0.034). For strain at first break and strain at maximum load, all sterilization methods were significantly inferior at the fifth month (p = 0.003 to p = 0.009). Maximum load values were significantly superior with E-beam irradiation at the fifth month (p = 0.003), and also significantly higher with gamma irradiation at the fifth month (p = 0.009). Young's modulus showed significantly inferior values in the frozen tendons at the fifth month (p = 0.001 to p = 0.003). In tendon type PL, no significant differences were found for any of the tested parameters compared to the native group. Conclusion Our results indicate that freezing alters mechanical properties via the decrease seen in the ultimate tensile strength. In addition, at the fifth and sixth months of storage, time could notably affect allografts rather than the sterilization procedures. LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Szilárd AU - Budai, Csaba AU - Botzheim, János TI - Colonial bacterial memetic algorithm and its application on a darts playing robot JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 15 PY - 2025 IS - 1 PG - 29 SN - 2045-2322 DO - 10.1038/s41598-025-94245-1 UR - https://m2.mtmt.hu/api/publication/36068566 ID - 36068566 N1 - The data supporting the findings of this study are available on GitLab at https://gitlab.inf.elte.hu/CBMA_Darts_Playing_Robot. AB - In this paper, we present the Colonial Bacterial Memetic Algorithm (CBMA), an advanced evolutionary optimization approach for robotic applications. CBMA extends the Bacterial Memetic Algorithm by integrating Cultural Algorithms and co-evolutionary dynamics inspired by bacterial group behavior. This combination of natural and artificial evolutionary elements results in a robust algorithm capable of handling complex challenges in robotics, such as constraints, multiple objectives, large search spaces, and complex models, while delivering fast and accurate solutions. CBMA incorporates features like multi-level clustering, dynamic gene selection, hierarchical population clustering, and adaptive co-evolutionary mechanisms, enabling efficient management of task-specific parameters and optimizing solution quality while minimizing resource consumption. The algorithm’s effectiveness is demonstrated through a real-world robotic application, achieving a 100% success rate in a robot arm’s ball-throwing task usually with significantly fewer iterations and evaluations compared to other methods. CBMA was also evaluated using the CEC-2017 benchmark suite, where it consistently outperformed state-of-the-art optimization algorithms, achieving superior outcomes in 71% of high-dimensional cases and demonstrating up to an 80% reduction in required evaluations. These results highlight CBMA’s efficiency, adaptability, and suitability for specialized tasks. Overall, CBMA exhibits exceptional performance in both real-world and benchmark evaluations, effectively balancing exploration and exploitation, and representing a significant advancement in adaptive evolutionary optimization for robotics. LA - English DB - MTMT ER -