TY - JOUR AU - Lelkes, János AU - Bak, Bendegúz Dezső AU - Kalmár-Nagy, Tamás TI - Vibrations and energy distribution in inhomogeneous rods with elastic and viscous boundary conditions JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 14 PY - 2024 IS - 1 PG - 16 SN - 2045-2322 DO - 10.1038/s41598-024-52860-4 UR - https://m2.mtmt.hu/api/publication/34562518 ID - 34562518 N1 - Export Date: 19 February 2024 Correspondence Address: Lelkes, J.; Department of Fluid Mechanics, Műegyetem rkp. 3., Hungary; email: lelkes.janos@gpk.bme.hu Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA, NKFI K 137726 Funding text 1: This work has been supported by the Hungarian National Research, Development and Innovation Fund under contract NKFI K 137726. The research reported in this paper and carried out at BME has been supported by the ÚNKP-22-3 New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund. The authors acknowledge the help of Mr. Ádám Zsiros with the initial, as well as the reviewers for their useful comments. Funding text 2: The research reported in this paper is part of project no. TKP-6-6/PALY-2021. 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 - Functionally graded materials have broad engineering applications including mechanical engineering, electronics, chemistry, and biomedical engineering. One notable advantage of such materials is that their stiffness distribution can be optimized to avoid stress concentration. A novel approach for solving the equations describing the longitudinal vibration of functionally graded rods with viscous and elastic boundary conditions is proposed. The characteristic equation of the system is derived for the solution of the undamped case for the constant stiffness rod. Then, a homotopy method is applied to compute the eigenvalues and mode shapes of graded rods for viscoelastic boundary conditions. The changes of the eigenvalues and mode shapes as function of the damping parameters are investigated. The optimal damping of the system is computed. It is shown that the qualitative behavior depends on the relation between the actual damping and the optimal damping of the system. The energy density distribution of graded rods is also discussed. An energy measure, the mean scaled energy density distribution is introduced to characterize the energy distribution along the rod in the asymptotic time limit. The significance of such a measure is that it reveals how the energy tends to distribute along the rod. It is shown that the energy distribution can be manipulated by changing the damping parameters. Qualitative changes depending on the relation between the actual damping and the optimal damping are highlighted. LA - English DB - MTMT ER - TY - CHAP AU - Maktabifard, Ali AU - Földes, Dávid AU - Bak, Bendegúz Dezső ED - Voß, Stefan ED - Shi, Xiaoning ED - Liedtke, Gernot ED - Daduna, Joachim R. TI - Constrained Multi-agent Path Planning Problem T2 - Computational Logistics PB - Springer Nature Switzerland AG CY - Cham SN - 9783031436123 T3 - Lecture Notes in Computer Science, ISSN 0302-9743 ; 14239. PY - 2023 SP - 450 EP - 466 PG - 17 DO - 10.1007/978-3-031-43612-3_28 UR - https://m2.mtmt.hu/api/publication/34134145 ID - 34134145 N1 - Faculty of Transportation Engineering and Vehicle Engineering, Department of Transport Technology and Economics, Budapest University of Technology and Economics, Budapest, Hungary Faculty of Mechanical Engineering, Department of Fluid Mechanics, Budapest University of Technology and Economics, Budapest, Hungary Export Date: 6 October 2023 Correspondence Address: Maktabifard, A.; Faculty of Transportation Engineering and Vehicle Engineering, Hungary; email: a.maktabifard@edu.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Lelkes, János AU - Horváth, Dávid András AU - Lendvai, Bálint AU - Farkas, Balázs AU - Bak, Bendegúz Dezső AU - Kalmár-Nagy, Tamás TI - Data-driven aerodynamic models for aeroelastic simulations JF - JOURNAL OF SOUND AND VIBRATION J2 - J SOUND VIB VL - 564 PY - 2023 PG - 16 SN - 0022-460X DO - 10.1016/j.jsv.2023.117847 UR - https://m2.mtmt.hu/api/publication/34046146 ID - 34046146 N1 - The research reported in this paper and carried out at BME has been supported by the ÚNKP-21-3 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund, Hungary. The research reported in this paper is part of project no. BME-NVA-02, implemented with the support provided by the Ministry of Innovation and Technology of Hungary from the National Research, Development and Innovation Fund, Hungary, financed under the TKP2021 funding scheme. This work has been supported by the Hungarian National Research, Development and Innovation Fund under contract NKFI K 137726. LA - English DB - MTMT ER - TY - CONF AU - Horváth, Dávid András AU - Lelkes, János AU - Bak, Bendegúz Dezső ED - Barabás, István TI - Adatalapú aerodinamikai modell megalkotása kvadrokopterekhez T2 - OGÉT 2023 PB - Erdélyi Magyar Műszaki Tudományos Társaság Gépészeti Szakosztály C1 - Kolozsvár T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 31. PY - 2023 SP - 219 EP - 223 PG - 5 UR - https://m2.mtmt.hu/api/publication/33889616 ID - 33889616 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Bak, Bendegúz Dezső AU - Rochlitz, Róbert Zoltán AU - Kalmár-Nagy, Tamás TI - Energy transfer mechanisms in binary tree-structured oscillator with nonlinear energy sinks JF - NONLINEAR DYNAMICS J2 - NONLINEAR DYNAM VL - 111 PY - 2023 SP - 9875 EP - 9888 PG - 14 SN - 0924-090X DO - 10.1007/s11071-023-08318-9 UR - https://m2.mtmt.hu/api/publication/33734704 ID - 33734704 AB - We study a binary tree-structured multi-degree-of-freedom nonlinear oscillator with impulsive and continuous excitations. The response of this model is studied for excitations that are applied to the largest masses. It is shown how choosing the mass of the smallest blocks influences the response of the system regarding the dissipation and how efficient targeted energy transfer is realized in the system. The simplified frequency energy plot is introduced as a means of analyzing the response of multi-degree-of-freedom systems for impulsive excitations. For continuous excitations, it is shown that the smallest masses (nonlinear energy sinks) are active only inside specific nonlinear frequency bands when the excitation amplitude is sufficiently high. LA - English DB - MTMT ER - TY - CHAP AU - Kustány, Kálmán AU - Hajgató, Gergely AU - Bak, Bendegúz Dezső AU - Kalmár-Nagy, Tamás ED - Vad, János TI - Classification of percolation clusters with artificial neural networks T2 - Proceedings of Conference on Modelling Fluid Flow (CMFF'22) PB - Budapest University of Technology and Economics, Department of Fluid Mechanics CY - Budapest SN - 9789634218814 PY - 2022 SP - 408 EP - 414 PG - 7 UR - https://m2.mtmt.hu/api/publication/33108573 ID - 33108573 LA - English DB - MTMT ER - TY - CHAP AU - Bak, Bendegúz Dezső AU - Rochlitz, Róbert Zoltán AU - Kalmár-Nagy, Tamás AU - Kristóf, Gergely ED - Vad, János TI - Mechanistic turbulence: Targeted energy transfer in a multi-degree-of-freedom nonlinear oscillator T2 - Proceedings of Conference on Modelling Fluid Flow (CMFF'22) PB - Budapest University of Technology and Economics, Department of Fluid Mechanics CY - Budapest SN - 9789634218814 PY - 2022 SP - 357 EP - 364 PG - 8 UR - https://m2.mtmt.hu/api/publication/33108564 ID - 33108564 LA - English DB - MTMT ER - TY - JOUR AU - Bak, Bendegúz Dezső AU - Kalmár-Nagy, Tamás TI - A Size-Perimeter Discrete Growth Model for Percolation Clusters JF - COMPLEXITY J2 - COMPLEXITY VL - 2021 PY - 2021 SP - 1 EP - 16 PG - 16 SN - 1076-2787 DO - 10.1155/2021/9919333 UR - https://m2.mtmt.hu/api/publication/32106557 ID - 32106557 LA - English DB - MTMT ER - TY - CHAP AU - Kalmár-Nagy, Tamás AU - Bak, Bendegúz Dezső ED - Bihari, Erika ED - Molnár, Dániel ED - Szikszai-Németh, Ketrin TI - Energiatranszfer Mechanisztikus Turbulenciamodellben T2 - Tavaszi Szél 2019 Konferencia = Spring Wind 2019: Konferenciakötet III. PB - Doktoranduszok Országos Szövetsége (DOSZ) CY - Budapest SN - 9786155586620 PY - 2020 SP - 15 EP - 25 PG - 11 UR - https://m2.mtmt.hu/api/publication/31187259 ID - 31187259 LA - Hungarian DB - MTMT ER - TY - THES AU - Bak, Bendegúz Dezső TI - Reduction of hierarchical multi-scale systems: percolation, traveling salesman problem and mechanistic turbulence PB - Budapesti Műszaki és Gazdaságtudományi Egyetem PY - 2019 SP - 87 UR - https://m2.mtmt.hu/api/publication/31018234 ID - 31018234 LA - English DB - MTMT ER -