TY - JOUR AU - Shahzad, Hasan AU - Wang, Xinhua AU - Rasool, Ghulam AU - Lelkes, János AU - Majeed, Afraz Hussain AU - Li, Zhiyong AU - Raizah, Zehba TI - Entropy generation and advanced hydrothermal examination of ferrofluid confined within an irregular cavity under Lorentz forces JF - JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS J2 - J MAGN MAGN MATER VL - 593 PY - 2024 PG - 12 SN - 0304-8853 DO - 10.1016/j.jmmm.2024.171814 UR - https://m2.mtmt.hu/api/publication/34682341 ID - 34682341 N1 - Faculty of Energy and Power Engineering, School of Chemical Engineering and Energy Technology, Dongguan University of Technology, China College of Mechanical and Energy Engineering, Beijing University of Technology, China Department of Mechanical Engineering, Lebanese American University, Beirut, Lebanon Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, Hungary Department of Mathematics, Air University, PAF Complex E-9, Islamabad, 44000, Pakistan Department of Mathematics, College of Science, Abha, King Khalid University, Saudi Arabia Export Date: 4 March 2024 CODEN: JMMMD Correspondence Address: Wang, X.; College of Mechanical and Energy Engineering, China; email: sunxhking@aliyun.com Funding details: National Natural Science Foundation of China, NSFC, 12202102 Funding text 1: This research was supported by National Natural Science Foundation of China (Grant No.12202102), The authors are grateful to the support from Guangdong Provincial key Laboratory of Distributed Energy Systems. LA - English DB - MTMT ER - 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 - 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 - CONF AU - Lelkes, János AU - Horváth, Dávid András AU - Kalmár-Nagy, Tamás ED - Barabás, István TI - Energiatranszfer folyamatok hiszterézises oszcillátor láncokban 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 - 341 EP - 345 PG - 5 UR - https://m2.mtmt.hu/api/publication/33889590 ID - 33889590 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Olgyay, Ábel AU - Takarics, Béla AU - Körösparti, Bence Balázs AU - Lelkes, János AU - Horváth, Csaba AU - Vanek, Bálint ED - Vad, János TI - Aeroservoelasticity investigation with panel method 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 - 392 EP - 399 PG - 8 UR - https://m2.mtmt.hu/api/publication/33108529 ID - 33108529 LA - English DB - MTMT ER - TY - CHAP AU - Lelkes, János AU - Horváth, Dávid András AU - Kalmár-Nagy, Tamás ED - Vad, János TI - Identification of data-driven aerodynamic models for reduced-order aeroelastic simulations 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 - 400 EP - 407 PG - 8 UR - https://m2.mtmt.hu/api/publication/33108497 ID - 33108497 LA - English DB - MTMT ER - TY - CHAP AU - Lelkes, János AU - Horváth, Dávid András ED - Barabás, István TI - Adatalapú aerodinamikai modellek megalkotása redukált aeroelasztikus szimulációkhoz T2 - XXX. Nemzetközi Gépészeti Konferencia - OGÉT 2022 PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Gépészeti Találkozó (OGÉT), ISSN 2068-1267 ; 30. PY - 2022 SP - 49 EP - 52 PG - 4 UR - https://m2.mtmt.hu/api/publication/32794326 ID - 32794326 LA - Hungarian DB - MTMT ER - TY - CONF AU - Horváth, Dávid András AU - Lelkes, János TI - Analysis of a parametrically excited aeroelastic wing model T2 - BOOK OF ABSTRACTS: Online Symposium on Aeroelasticity, Fluid-Structure Interaction, and Vibrations PY - 2021 SP - 205 EP - 212 PG - 8 UR - https://m2.mtmt.hu/api/publication/34007842 ID - 34007842 LA - English DB - MTMT ER - TY - CHAP AU - Lelkes, János ED - Molnár, Dániel ED - Molnár , Dóra TI - Dynamics of a truncated cone-shaped heaving point absorber wave energy converter model T2 - XXIV. Tavaszi Szél Konferencia 2021 Tanulmánykötet II. PB - Doktoranduszok Országos Szövetsége (DOSZ) CY - Budapest SN - 9786158199131 PY - 2021 SP - 124 EP - 134 PG - 11 UR - https://m2.mtmt.hu/api/publication/32725287 ID - 32725287 LA - English DB - MTMT ER -