@article{MTMT:34562518, title = {Vibrations and energy distribution in inhomogeneous rods with elastic and viscous boundary conditions}, url = {https://m2.mtmt.hu/api/publication/34562518}, author = {Lelkes, János and Bak, Bendegúz Dezső and Kalmár-Nagy, Tamás}, doi = {10.1038/s41598-024-52860-4}, journal-iso = {SCI REP}, journal = {SCIENTIFIC REPORTS}, volume = {14}, unique-id = {34562518}, issn = {2045-2322}, abstract = {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.}, year = {2024}, eissn = {2045-2322}, orcid-numbers = {Lelkes, János/0000-0002-6205-4923; Bak, Bendegúz Dezső/0000-0003-1378-875X; Kalmár-Nagy, Tamás/0000-0003-1374-2620} } @inproceedings{MTMT:34134145, title = {Constrained Multi-agent Path Planning Problem}, url = {https://m2.mtmt.hu/api/publication/34134145}, author = {Maktabifard, Ali and Földes, Dávid and Bak, Bendegúz Dezső}, booktitle = {Computational Logistics}, doi = {10.1007/978-3-031-43612-3_28}, unique-id = {34134145}, year = {2023}, pages = {450-466}, orcid-numbers = {Földes, Dávid/0000-0003-4352-8166; Bak, Bendegúz Dezső/0000-0003-1378-875X} } @article{MTMT:34046146, title = {Data-driven aerodynamic models for aeroelastic simulations}, url = {https://m2.mtmt.hu/api/publication/34046146}, author = {Lelkes, János and Horváth, Dávid András and Lendvai, Bálint and Farkas, Balázs and Bak, Bendegúz Dezső and Kalmár-Nagy, Tamás}, doi = {10.1016/j.jsv.2023.117847}, journal-iso = {J SOUND VIB}, journal = {JOURNAL OF SOUND AND VIBRATION}, volume = {564}, unique-id = {34046146}, issn = {0022-460X}, year = {2023}, eissn = {1095-8568}, orcid-numbers = {Lelkes, János/0000-0002-6205-4923; Lendvai, Bálint/0000-0003-3741-2001; Bak, Bendegúz Dezső/0000-0003-1378-875X; Kalmár-Nagy, Tamás/0000-0003-1374-2620} } @CONFERENCE{MTMT:33889616, title = {Adatalapú aerodinamikai modell megalkotása kvadrokopterekhez}, url = {https://m2.mtmt.hu/api/publication/33889616}, author = {Horváth, Dávid András and Lelkes, János and Bak, Bendegúz Dezső}, booktitle = {OGÉT 2023}, unique-id = {33889616}, year = {2023}, pages = {219-223}, orcid-numbers = {Lelkes, János/0000-0002-6205-4923; Bak, Bendegúz Dezső/0000-0003-1378-875X} } @article{MTMT:33734704, title = {Energy transfer mechanisms in binary tree-structured oscillator with nonlinear energy sinks}, url = {https://m2.mtmt.hu/api/publication/33734704}, author = {Bak, Bendegúz Dezső and Rochlitz, Róbert Zoltán and Kalmár-Nagy, Tamás}, doi = {10.1007/s11071-023-08318-9}, journal-iso = {NONLINEAR DYNAM}, journal = {NONLINEAR DYNAMICS}, volume = {111}, unique-id = {33734704}, issn = {0924-090X}, abstract = {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.}, year = {2023}, eissn = {1573-269X}, pages = {9875-9888}, orcid-numbers = {Bak, Bendegúz Dezső/0000-0003-1378-875X; Kalmár-Nagy, Tamás/0000-0003-1374-2620} } @inproceedings{MTMT:33108573, title = {Classification of percolation clusters with artificial neural networks}, url = {https://m2.mtmt.hu/api/publication/33108573}, author = {Kustány, Kálmán and Hajgató, Gergely and Bak, Bendegúz Dezső and Kalmár-Nagy, Tamás}, booktitle = {Proceedings of Conference on Modelling Fluid Flow (CMFF'22)}, unique-id = {33108573}, year = {2022}, pages = {408-414}, orcid-numbers = {Hajgató, Gergely/0000-0003-4283-126X; Bak, Bendegúz Dezső/0000-0003-1378-875X; Kalmár-Nagy, Tamás/0000-0003-1374-2620} } @inproceedings{MTMT:33108564, title = {Mechanistic turbulence: Targeted energy transfer in a multi-degree-of-freedom nonlinear oscillator}, url = {https://m2.mtmt.hu/api/publication/33108564}, author = {Bak, Bendegúz Dezső and Rochlitz, Róbert Zoltán and Kalmár-Nagy, Tamás and Kristóf, Gergely}, booktitle = {Proceedings of Conference on Modelling Fluid Flow (CMFF'22)}, unique-id = {33108564}, year = {2022}, pages = {357-364}, orcid-numbers = {Bak, Bendegúz Dezső/0000-0003-1378-875X; Kalmár-Nagy, Tamás/0000-0003-1374-2620; Kristóf, Gergely/0000-0001-7572-6875} } @article{MTMT:32106557, title = {A Size-Perimeter Discrete Growth Model for Percolation Clusters}, url = {https://m2.mtmt.hu/api/publication/32106557}, author = {Bak, Bendegúz Dezső and Kalmár-Nagy, Tamás}, doi = {10.1155/2021/9919333}, journal-iso = {COMPLEXITY}, journal = {COMPLEXITY}, volume = {2021}, unique-id = {32106557}, issn = {1076-2787}, year = {2021}, eissn = {1099-0526}, pages = {1-16}, orcid-numbers = {Bak, Bendegúz Dezső/0000-0003-1378-875X; Kalmár-Nagy, Tamás/0000-0003-1374-2620} } @inproceedings{MTMT:31187259, title = {Energiatranszfer Mechanisztikus Turbulenciamodellben}, url = {https://m2.mtmt.hu/api/publication/31187259}, author = {Kalmár-Nagy, Tamás and Bak, Bendegúz Dezső}, booktitle = {Tavaszi Szél 2019 Konferencia = Spring Wind 2019: Konferenciakötet III.}, unique-id = {31187259}, year = {2020}, pages = {15-25}, orcid-numbers = {Kalmár-Nagy, Tamás/0000-0003-1374-2620; Bak, Bendegúz Dezső/0000-0003-1378-875X} } @mastersthesis{MTMT:31018234, title = {Reduction of hierarchical multi-scale systems: percolation, traveling salesman problem and mechanistic turbulence}, url = {https://m2.mtmt.hu/api/publication/31018234}, author = {Bak, Bendegúz Dezső}, publisher = {Budapest University of Technology and Economics}, unique-id = {31018234}, year = {2019}, orcid-numbers = {Bak, Bendegúz Dezső/0000-0003-1378-875X} }