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[nazev] => Diagnostika asynchronních motorů a jejich testování
[nazev_orig] => Diagnostika asynchronních motorů a jejich testování
[duvernost_udaju_id] => S
[popis] => Článek prezentuje význam diagnostiky motorů elektrických pohonů napájených z frekvenčních měničů v kontextu prediktivní a proaktivní údržby. Popisuje možnosti využití diagnostických metod pro sledování stavu elektrických pohonů a poskytuje ucelený pohled na multiparametrickou diagnostiku těchto pohonů.
[popis_orig] => Článek prezentuje význam diagnostiky motorů elektrických pohonů napájených z frekvenčních měničů v kontextu prediktivní a proaktivní údržby. Popisuje možnosti využití diagnostických metod pro sledování stavu elektrických pohonů a poskytuje ucelený pohled na multiparametrickou diagnostiku těchto pohonů.
[klicova_slova] => asynchronní motor; technická diagnostika; elektrodiagnostika
[klicova_slova_orig] => asynchronní motor; technická diagnostika; elektrodiagnostika
[url] => https://www.vseoprumyslu.cz/knihovna/rizeni-a-udrzba/rizeni-a-udrzba-prumysloveho-podniku-1-2024.html
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[identifikator_popis] => ISSN - Technická diagnostika (CZ)
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[citace_text] => HAMMER, M.; NAHODIL, P. Diagnostika asynchronních motorů a jejich testování. Technická diagnostika, 2024, roč. 33, č. 1, s. 4-7. ISSN: 1210-311X.
[citace_html] => HAMMER, M.; NAHODIL, P. Diagnostika asynchronních motorů a jejich testování. Technická diagnostika, 2024, roč. 33, č. 1, s. 4-7. ISSN: 1210-311X.
[citace_rtf] =>
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author="Miloš {Hammer} and Petr {Nahodil}",
title="Diagnostika asynchronních motorů a jejich testování",
journal="Technická diagnostika",
year="2024",
volume="33",
number="1",
pages="4--7",
issn="1210-311X",
url="https://www.vseoprumyslu.cz/knihovna/rizeni-a-udrzba/rizeni-a-udrzba-prumysloveho-podniku-1-2024.html"
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[nazev_en] => Diagnostics of asynchronous motors and their testing
[popis_en] => The paper presents the importance of diagnostics of motors of electric drives powered by frequency converters in the context of predictive and proactive maintenance. It describes the possibilities of using diagnostic methods to monitor the condition of electric drives and provides a comprehensive view of multiparametric diagnostics of these drives.
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[nazev] => Soft computing methods in the solution of an inverse heat transfer problem with phase change: A comparative study
[nazev_orig] => Soft computing methods in the solution of an inverse heat transfer problem with phase change: A comparative study
[duvernost_udaju_id] => S
[popis] => Inverse heat transfer problems are ill-posed problems and their solution is challenging. Conventional (hard computing) solution methods were developed for this purpose in the past, but they are not well applicable in cases including phase change, which contain strong non-linearity and bring additional computational difficulties. Soft computing methods, which currently experience very rapid development, are a promising tool for the solution of such problems. This paper addresses an inverse heat transfer problem with phase change, in which the boundary heat flux is estimated. Four methods based on distinct mathematical principles are applied to this problem and thoroughly compared. These methods include a conventional Levenberg-Marquardt method (LMM), a predictive fuzzy logic (PFL)-based method, a population-based meta-heuristic method called LSHADE (a state-of-the-art differential evolution variant), and a recently developed surrogate-assisted method coupled with differential evolution, referred to as LSADE method. Furthermore, a reformulation of the problem was developed, utilising a dimension reduction scheme and a decomposition scheme that led to sub-problems with different time frames. This reformulation brought extensive computational improvements. Results of the comparison of the methods then showed that the LMM and the PFL behave well in case without phase change but their performance deteriorates substantially in case with phase change. The LSHADE and the LSADE showed superior performance in the solution of the inverse problem with the phase change. Moreover, their performance was rather stable and insensitive to the location of the temperature sensor, which was the source of data for the estimation.
[popis_orig] => Inverse heat transfer problems are ill-posed problems and their solution is challenging. Conventional (hard computing) solution methods were developed for this purpose in the past, but they are not well applicable in cases including phase change, which contain strong non-linearity and bring additional computational difficulties. Soft computing methods, which currently experience very rapid development, are a promising tool for the solution of such problems. This paper addresses an inverse heat transfer problem with phase change, in which the boundary heat flux is estimated. Four methods based on distinct mathematical principles are applied to this problem and thoroughly compared. These methods include a conventional Levenberg-Marquardt method (LMM), a predictive fuzzy logic (PFL)-based method, a population-based meta-heuristic method called LSHADE (a state-of-the-art differential evolution variant), and a recently developed surrogate-assisted method coupled with differential evolution, referred to as LSADE method. Furthermore, a reformulation of the problem was developed, utilising a dimension reduction scheme and a decomposition scheme that led to sub-problems with different time frames. This reformulation brought extensive computational improvements. Results of the comparison of the methods then showed that the LMM and the PFL behave well in case without phase change but their performance deteriorates substantially in case with phase change. The LSHADE and the LSADE showed superior performance in the solution of the inverse problem with the phase change. Moreover, their performance was rather stable and insensitive to the location of the temperature sensor, which was the source of data for the estimation.
[klicova_slova] => Inverse heat transfer; Soft computing; Machine learning; Meta-heuristics; Surrogate model; Fuzzy logic
[klicova_slova_orig] => Inverse heat transfer; Soft computing; Machine learning; Meta-heuristics; Surrogate model; Fuzzy logic
[url] => https://www.sciencedirect.com/science/article/pii/S0952197624003877
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[citace_text] => MAUDER, T.; KŮDELA, J.; KLIMEŠ, L.; ZÁLEŠÁK, M.; CHARVÁT, P. Soft computing methods in the solution of an inverse heat transfer problem with phase change: A comparative study. Engineering Applications of Artificial Intelligence, 2024, vol. 133, no. B, 17 p. ISSN: 1873-6769.
[citace_html] => MAUDER, T.; KŮDELA, J.; KLIMEŠ, L.; ZÁLEŠÁK, M.; CHARVÁT, P. Soft computing methods in the solution of an inverse heat transfer problem with phase change: A comparative study. Engineering Applications of Artificial Intelligence, 2024, vol. 133, no. B, 17 p. ISSN: 1873-6769.
[citace_rtf] =>
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author="Tomáš {Mauder} and Jakub {Kůdela} and Lubomír {Klimeš} and Martin {Zálešák} and Pavel {Charvát}",
title="Soft computing methods in the solution of an inverse heat transfer problem with phase change: A comparative study",
journal="Engineering Applications of Artificial Intelligence",
year="2024",
volume="133",
number="B",
pages="17",
doi="10.1016/j.engappai.2024.108229",
issn="0952-1976",
url="https://www.sciencedirect.com/science/article/pii/S0952197624003877"
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[nazev_en] => Soft computing methods in the solution of an inverse heat transfer problem with phase change: A comparative study
[popis_en] => Inverse heat transfer problems are ill-posed problems and their solution is challenging. Conventional (hard computing) solution methods were developed for this purpose in the past, but they are not well applicable in cases including phase change, which contain strong non-linearity and bring additional computational difficulties. Soft computing methods, which currently experience very rapid development, are a promising tool for the solution of such problems. This paper addresses an inverse heat transfer problem with phase change, in which the boundary heat flux is estimated. Four methods based on distinct mathematical principles are applied to this problem and thoroughly compared. These methods include a conventional Levenberg-Marquardt method (LMM), a predictive fuzzy logic (PFL)-based method, a population-based meta-heuristic method called LSHADE (a state-of-the-art differential evolution variant), and a recently developed surrogate-assisted method coupled with differential evolution, referred to as LSADE method. Furthermore, a reformulation of the problem was developed, utilising a dimension reduction scheme and a decomposition scheme that led to sub-problems with different time frames. This reformulation brought extensive computational improvements. Results of the comparison of the methods then showed that the LMM and the PFL behave well in case without phase change but their performance deteriorates substantially in case with phase change. The LSHADE and the LSADE showed superior performance in the solution of the inverse problem with the phase change. Moreover, their performance was rather stable and insensitive to the location of the temperature sensor, which was the source of data for the estimation.
[klicova_slova_en] => Inverse heat transfer; Soft computing; Machine learning; Meta-heuristics; Surrogate model; Fuzzy logic
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[nazev] => Design of FDM fabricated poly-lactic acid parts with forced-air cooling speed as the new control parameter to tune its shape memory effect
[nazev_orig] => Design of FDM fabricated poly-lactic acid parts with forced-air cooling speed as the new control parameter to tune its shape memory effect
[duvernost_udaju_id] => S
[popis] => Poly lactic acid (PLA) as one of the shape memory polymers has extensively been used as the material in the 3D printing by fused deposition modeling process. In this study, we introduced the forced-air cooling speed as new control parameter in the fabrication process. A commercial material extrusion printer was retrofitted with a control module of forced-air cooling system. The shape memory effects of the PLA printed in different cooling speeds from 0-5 m s-1 were first measured by submerging the printed coupon specimens into water bath at recovery temperature. It is found that the changes in dimensions were mainly anisotropic and dependent of the raster angle in printing, in addition to the controlled cooling speed. The shape memory strains were roughly in linear trend with the magnitude of cooling air speed. In other words, the shape memory effect of the PLA can be easily controlled by the cooling air speed in fabrication. X-ray diffraction measurement on the specimens before and after recovery treatment confirmed the shape memory effect was related to the partial crystallization of molecular structure. Moreover, the different cooling air speeds also induced different thermal stresses in the printed specimens which manifest its important role in the total shape memory strain. Finally, the proposed theoretical beam formulation for the recovery bending deflection was shown to have good prediction accuracy comparing with experimental measurements.
[popis_orig] => Poly lactic acid (PLA) as one of the shape memory polymers has extensively been used as the material in the 3D printing by fused deposition modeling process. In this study, we introduced the forced-air cooling speed as new control parameter in the fabrication process. A commercial material extrusion printer was retrofitted with a control module of forced-air cooling system. The shape memory effects of the PLA printed in different cooling speeds from 0-5 m s-1 were first measured by submerging the printed coupon specimens into water bath at recovery temperature. It is found that the changes in dimensions were mainly anisotropic and dependent of the raster angle in printing, in addition to the controlled cooling speed. The shape memory strains were roughly in linear trend with the magnitude of cooling air speed. In other words, the shape memory effect of the PLA can be easily controlled by the cooling air speed in fabrication. X-ray diffraction measurement on the specimens before and after recovery treatment confirmed the shape memory effect was related to the partial crystallization of molecular structure. Moreover, the different cooling air speeds also induced different thermal stresses in the printed specimens which manifest its important role in the total shape memory strain. Finally, the proposed theoretical beam formulation for the recovery bending deflection was shown to have good prediction accuracy comparing with experimental measurements.
[klicova_slova] => Shape memory polymer; Polylactic acid; Fused deposition modeling (FDM); 4D printing; Forced-air cooling
[klicova_slova_orig] => Shape memory polymer; Polylactic acid; Fused deposition modeling (FDM); 4D printing; Forced-air cooling
[url] => https://iopscience.iop.org/article/10.1088/1361-665X/ad65a9
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[citace_text] => Chun-Ying Lee, Chung-Yin Liu, Zdenek Hadas, Ivo Stachiv. Design of FDM fabricated poly-lactic acid parts with forced-air cooling speed as the new control parameter to tune its shape memory effect. Smart Materials and Structures, 2024, vol. 33, no. 8, 9 p. ISSN: 0964-1726.
[citace_html] => Chun-Ying Lee, Chung-Yin Liu, Zdenek Hadas, Ivo Stachiv. Design of FDM fabricated poly-lactic acid parts with forced-air cooling speed as the new control parameter to tune its shape memory effect. Smart Materials and Structures, 2024, vol. 33, no. 8, 9 p. ISSN: 0964-1726.
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author="Zdeněk {Hadaš} and Ivo {Stachiv}",
title="Design of FDM fabricated poly-lactic acid parts with forced-air cooling speed as the new control parameter to tune its shape memory effect",
journal="Smart Materials and Structures",
year="2024",
volume="33",
number="8",
pages="9",
doi="10.1088/1361-665X/ad65a9",
issn="0964-1726",
url="https://iopscience.iop.org/article/10.1088/1361-665X/ad65a9"
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[nazev_en] => Design of FDM fabricated poly-lactic acid parts with forced-air cooling speed as the new control parameter to tune its shape memory effect
[popis_en] => Poly lactic acid (PLA) as one of the shape memory polymers has extensively been used as the material in the 3D printing by fused deposition modeling process. In this study, we introduced the forced-air cooling speed as new control parameter in the fabrication process. A commercial material extrusion printer was retrofitted with a control module of forced-air cooling system. The shape memory effects of the PLA printed in different cooling speeds from 0-5 m s-1 were first measured by submerging the printed coupon specimens into water bath at recovery temperature. It is found that the changes in dimensions were mainly anisotropic and dependent of the raster angle in printing, in addition to the controlled cooling speed. The shape memory strains were roughly in linear trend with the magnitude of cooling air speed. In other words, the shape memory effect of the PLA can be easily controlled by the cooling air speed in fabrication. X-ray diffraction measurement on the specimens before and after recovery treatment confirmed the shape memory effect was related to the partial crystallization of molecular structure. Moreover, the different cooling air speeds also induced different thermal stresses in the printed specimens which manifest its important role in the total shape memory strain. Finally, the proposed theoretical beam formulation for the recovery bending deflection was shown to have good prediction accuracy comparing with experimental measurements.
[klicova_slova_en] => Shape memory polymer; Polylactic acid; Fused deposition modeling (FDM); 4D printing; Forced-air cooling
[vysledek_datum] => 2024-07-29T00:00:00+02:00
)
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(
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[nazev] => Vibration energy harvesting system with cyclically time-varying potential barrier
[nazev_orig] => Vibration energy harvesting system with cyclically time-varying potential barrier
[duvernost_udaju_id] => S
[popis] => Nonlinear kinetic energy harvesters are becoming more and more popular as well as advanced and efficient. This paper presents the study of the dynamics of such a system in a wide range of excitation parameters, assuming at the same time the possibility of a cyclical and smooth change of the potential function. We have designed a system that allows to obtain a wide spectrum of potential characteristics, from a single well to a three -well system, and we have analyzed its effectiveness. Next, we checked the influence of parameters characterizing the change of potential using bifurcation diagrams and their comparison with the effective voltage values. We also analyzed the behavior of the system in chaotic and periodic motion zones and presented selected sections of Poincare and Fourier amplitude -frequency spectra of chaotic solutions. The last element of the analysis was the impact of cyclic potential change on coexisting solutions. We have shown that the best effectiveness is achieved when the frequency of the external load is equal to the resonant frequency of the flexible cantilever beam and the change of potential is limited to extreme positions.
[popis_orig] => Nonlinear kinetic energy harvesters are becoming more and more popular as well as advanced and efficient. This paper presents the study of the dynamics of such a system in a wide range of excitation parameters, assuming at the same time the possibility of a cyclical and smooth change of the potential function. We have designed a system that allows to obtain a wide spectrum of potential characteristics, from a single well to a three -well system, and we have analyzed its effectiveness. Next, we checked the influence of parameters characterizing the change of potential using bifurcation diagrams and their comparison with the effective voltage values. We also analyzed the behavior of the system in chaotic and periodic motion zones and presented selected sections of Poincare and Fourier amplitude -frequency spectra of chaotic solutions. The last element of the analysis was the impact of cyclic potential change on coexisting solutions. We have shown that the best effectiveness is achieved when the frequency of the external load is equal to the resonant frequency of the flexible cantilever beam and the change of potential is limited to extreme positions.
[klicova_slova] => Kinetic energy harvesting; Piezoelectric; Modeling; chaos; Bifurcations; Multiple solutions
[klicova_slova_orig] => Kinetic energy harvesting; Piezoelectric; Modeling; chaos; Bifurcations; Multiple solutions
[url] => https://www.sciencedirect.com/science/article/pii/S0306261924007670?via%3Dihub
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[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
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[vycet_osob] => Jerzy Margielewicz, Damian Gąska, Tomasz Haniszewski, Grzegorz Litak, Piotr Wolszczak, Marek Borowiec, Petr Sosna, Oldřich Ševeček, Ondřej Rubeš, Zdeněk Hadaš
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[kod_doi] => 10.1016/j.apenergy.2024.123384
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[stav] => Approved
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[citace_text] => Jerzy Margielewicz, Damian Gąska, Tomasz Haniszewski, Grzegorz Litak, Piotr Wolszczak, Marek Borowiec, Petr Sosna, Oldřich Ševeček, Ondřej Rubeš, Zdeněk Hadaš. Vibration energy harvesting system with cyclically time-varying potential barrier. Applied Energy, 2024, vol. 367, no. 123384, 28 p. ISSN: 0306-2619.
[citace_html] => Jerzy Margielewicz, Damian Gąska, Tomasz Haniszewski, Grzegorz Litak, Piotr Wolszczak, Marek Borowiec, Petr Sosna, Oldřich Ševeček, Ondřej Rubeš, Zdeněk Hadaš. Vibration energy harvesting system with cyclically time-varying potential barrier. Applied Energy, 2024, vol. 367, no. 123384, 28 p. ISSN: 0306-2619.
[citace_rtf] =>
[citace_bibtex] => @article{BUT189249,
author="Petr {Sosna} and Oldřich {Ševeček} and Ondřej {Rubeš} and Zdeněk {Hadaš}",
title="Vibration energy harvesting system with cyclically time-varying potential barrier",
journal="Applied Energy",
year="2024",
volume="367",
number="123384",
pages="28",
doi="10.1016/j.apenergy.2024.123384",
issn="0306-2619",
url="https://www.sciencedirect.com/science/article/pii/S0306261924007670?via%3Dihub"
}
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[poznamka_metriky] =>
[nazev_en] => Vibration energy harvesting system with cyclically time-varying potential barrier
[popis_en] => Nonlinear kinetic energy harvesters are becoming more and more popular as well as advanced and efficient. This paper presents the study of the dynamics of such a system in a wide range of excitation parameters, assuming at the same time the possibility of a cyclical and smooth change of the potential function. We have designed a system that allows to obtain a wide spectrum of potential characteristics, from a single well to a three -well system, and we have analyzed its effectiveness. Next, we checked the influence of parameters characterizing the change of potential using bifurcation diagrams and their comparison with the effective voltage values. We also analyzed the behavior of the system in chaotic and periodic motion zones and presented selected sections of Poincare and Fourier amplitude -frequency spectra of chaotic solutions. The last element of the analysis was the impact of cyclic potential change on coexisting solutions. We have shown that the best effectiveness is achieved when the frequency of the external load is equal to the resonant frequency of the flexible cantilever beam and the change of potential is limited to extreme positions.
[klicova_slova_en] => Kinetic energy harvesting; Piezoelectric; Modeling; chaos; Bifurcations; Multiple solutions
[vysledek_datum] => 2024-08-01T00:00:00+02:00
)
[4] => Array
(
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[nazev] => Machinability analysis of Albromet W130 copper alloy by WEDM
[nazev_orig] => Machinability analysis of Albromet W130 copper alloy by WEDM
[duvernost_udaju_id] => S
[popis] => The unconventional Wire Electrical Discharge Machining (WEDM) technology represents a vital manufacturing technology in different industrial branches, such as aviation, military, automotive or energy industry. The WEDM energy demand is considerable and it is, therefore, desirable to reduce the machining time by optimising the machining parameters. In the study, the chosen parameters were Pulse off time, Gap voltage, Discharge current, Pulse on time, and Wire feed. Another factor we investigated in our Box-Behnken design of experiment was the workpiece thickness. The cutting speed, topography, and surface morphology were analysed in the samples produced for the design of experiment. This investigation was carried out using electron microscopy. The chemical composition of individual spots was analysed as well. The samples were found not to have significant differences in the appearance of craters on the edge and in the centre. Similarly, there was no significant difference observed between thicknesses and different parameter settings. The surfaces also show a large number of small bubbles. There were, however, no cracks or other defects found, even in the cross-sections of all samples.
[popis_orig] => The unconventional Wire Electrical Discharge Machining (WEDM) technology represents a vital manufacturing technology in different industrial branches, such as aviation, military, automotive or energy industry. The WEDM energy demand is considerable and it is, therefore, desirable to reduce the machining time by optimising the machining parameters. In the study, the chosen parameters were Pulse off time, Gap voltage, Discharge current, Pulse on time, and Wire feed. Another factor we investigated in our Box-Behnken design of experiment was the workpiece thickness. The cutting speed, topography, and surface morphology were analysed in the samples produced for the design of experiment. This investigation was carried out using electron microscopy. The chemical composition of individual spots was analysed as well. The samples were found not to have significant differences in the appearance of craters on the edge and in the centre. Similarly, there was no significant difference observed between thicknesses and different parameter settings. The surfaces also show a large number of small bubbles. There were, however, no cracks or other defects found, even in the cross-sections of all samples.
[klicova_slova] => WEDM; wire electrical discharge machining; Albromet W130; design of experiment; machining parameters
[klicova_slova_orig] => WEDM; wire electrical discharge machining; Albromet W130; design of experiment; machining parameters
[url] => https://link.springer.com/article/10.1007/s00170-024-14530-7
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[odpovedny_utvar_id] => 207
[odpovedny_utvar_nazev] => Institute of Automation and Computer Science
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[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
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[schvaleno] => 2025-04-02
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[vycet_osob] => MOURALOVÁ, K.; BEDNÁŘ, J; BENEŠ, L.; ZAHRADNÍČEK, R.; FRIES, J.
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[citace_text] => MOURALOVÁ, K.; BEDNÁŘ, J; BENEŠ, L.; ZAHRADNÍČEK, R.; FRIES, J. Machinability analysis of Albromet W130 copper alloy by WEDM. International Journal of Advanced Manufacturing Technology, 2024, vol. 134, no. 11, p. 5771-5785. ISSN: 0268-3768.
[citace_html] => MOURALOVÁ, K.; BEDNÁŘ, J; BENEŠ, L.; ZAHRADNÍČEK, R.; FRIES, J. Machinability analysis of Albromet W130 copper alloy by WEDM. International Journal of Advanced Manufacturing Technology, 2024, vol. 134, no. 11, p. 5771-5785. ISSN: 0268-3768.
[citace_rtf] =>
[citace_bibtex] => @article{BUT189756,
author="Kateřina {Mouralová} and Josef {Bednář} and Libor {Beneš} and Radim {Zahradníček} and Jiří {Fries}",
title="Machinability analysis of Albromet W130 copper alloy by WEDM",
journal="International Journal of Advanced Manufacturing Technology",
year="2024",
volume="134",
number="11",
pages="5771--5785",
doi="10.1007/s00170-024-14530-7",
issn="0268-3768",
url="https://link.springer.com/article/10.1007/s00170-024-14530-7"
}
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[nazev_en] => Machinability analysis of Albromet W130 copper alloy by WEDM
[popis_en] => The unconventional Wire Electrical Discharge Machining (WEDM) technology represents a vital manufacturing technology in different industrial branches, such as aviation, military, automotive or energy industry. The WEDM energy demand is considerable and it is, therefore, desirable to reduce the machining time by optimising the machining parameters. In the study, the chosen parameters were Pulse off time, Gap voltage, Discharge current, Pulse on time, and Wire feed. Another factor we investigated in our Box-Behnken design of experiment was the workpiece thickness. The cutting speed, topography, and surface morphology were analysed in the samples produced for the design of experiment. This investigation was carried out using electron microscopy. The chemical composition of individual spots was analysed as well. The samples were found not to have significant differences in the appearance of craters on the edge and in the centre. Similarly, there was no significant difference observed between thicknesses and different parameter settings. The surfaces also show a large number of small bubbles. There were, however, no cracks or other defects found, even in the cross-sections of all samples.
[klicova_slova_en] => WEDM; wire electrical discharge machining; Albromet W130; design of experiment; machining parameters
[vysledek_datum] => 2024-10-05T00:00:00+02:00
)
[5] => Array
(
[vysledek_id] => 191171
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 152609
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[nazev] => Influence of different wire materials on the machining of Albromet W130 by WEDM
[nazev_orig] => Influence of different wire materials on the machining of Albromet W130 by WEDM
[duvernost_udaju_id] => S
[popis] => Wire Electrical Discharge Machining (WEDM) is an unconventional machining technology, widely spread in different sectors of many industries. The machining uses periodically repeating electrical impulses, which allows all materials with at least a minimum electrical conductivity to be machined. The machining tool is a thin wire that can be made of many different materials. Wire electrode material requirements vary from industry to industry. This study aimed to increase the efficiency of WEDM through an analysis of the influence of the type of wire material on the machining of Albromet W130 copper alloy. The analysis comprised a molybdenum, brass and a copper wire of a 0.25 mm diameter and a Box-Behnken design of experiment totalling 42 rounds. The design of experiment results analysis covered cutting speed, machined surfaces' topography and morphology, and the subsurface layer condition. Furthermore, an analysis of the wire electrodes used in the experiment was carried out. The highest cutting speed was achieved using a copper wire and the lowest R a values were achieved in samples machined with a molybdenum wire.
[popis_orig] => Wire Electrical Discharge Machining (WEDM) is an unconventional machining technology, widely spread in different sectors of many industries. The machining uses periodically repeating electrical impulses, which allows all materials with at least a minimum electrical conductivity to be machined. The machining tool is a thin wire that can be made of many different materials. Wire electrode material requirements vary from industry to industry. This study aimed to increase the efficiency of WEDM through an analysis of the influence of the type of wire material on the machining of Albromet W130 copper alloy. The analysis comprised a molybdenum, brass and a copper wire of a 0.25 mm diameter and a Box-Behnken design of experiment totalling 42 rounds. The design of experiment results analysis covered cutting speed, machined surfaces' topography and morphology, and the subsurface layer condition. Furthermore, an analysis of the wire electrodes used in the experiment was carried out. The highest cutting speed was achieved using a copper wire and the lowest R a values were achieved in samples machined with a molybdenum wire.
[klicova_slova] => WEDM; electrical discharge machining; wire; Albromet W130; design of experiment; machining parameters
[klicova_slova_orig] => WEDM; electrical discharge machining; wire; Albromet W130; design of experiment; machining parameters
[url] => https://journals.sagepub.com/doi/abs/10.1177/09544054241289186
[oecd_obor_id] => 20301
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[odpovedny_utvar_nazev] => Institute of Automation and Computer Science
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[citace_text] => MOURALOVÁ, K.; BENEŠ, L.; BEDNÁŘ, J; ZAHRADNÍČEK, R.; FRIES, J. Influence of different wire materials on the machining of Albromet W130 by WEDM. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE, 2024, vol. 238, no. 14, 14 p. ISSN: 0954-4054.
[citace_html] => MOURALOVÁ, K.; BENEŠ, L.; BEDNÁŘ, J; ZAHRADNÍČEK, R.; FRIES, J. Influence of different wire materials on the machining of Albromet W130 by WEDM. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE, 2024, vol. 238, no. 14, 14 p. ISSN: 0954-4054.
[citace_rtf] =>
[citace_bibtex] => @article{BUT191171,
author="MOURALOVÁ, K. and BENEŠ, L. and BEDNÁŘ, J and ZAHRADNÍČEK, R. and FRIES, J.",
title="Influence of different wire materials on the machining of Albromet W130 by WEDM",
journal="PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE",
year="2024",
volume="238",
number="14",
pages="14",
doi="10.1177/09544054241289186",
issn="0954-4054",
url="https://journals.sagepub.com/doi/abs/10.1177/09544054241289186"
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[nazev_en] => Influence of different wire materials on the machining of Albromet W130 by WEDM
[popis_en] => Wire Electrical Discharge Machining (WEDM) is an unconventional machining technology, widely spread in different sectors of many industries. The machining uses periodically repeating electrical impulses, which allows all materials with at least a minimum electrical conductivity to be machined. The machining tool is a thin wire that can be made of many different materials. Wire electrode material requirements vary from industry to industry. This study aimed to increase the efficiency of WEDM through an analysis of the influence of the type of wire material on the machining of Albromet W130 copper alloy. The analysis comprised a molybdenum, brass and a copper wire of a 0.25 mm diameter and a Box-Behnken design of experiment totalling 42 rounds. The design of experiment results analysis covered cutting speed, machined surfaces' topography and morphology, and the subsurface layer condition. Furthermore, an analysis of the wire electrodes used in the experiment was carried out. The highest cutting speed was achieved using a copper wire and the lowest R a values were achieved in samples machined with a molybdenum wire.
[klicova_slova_en] => WEDM; electrical discharge machining; wire; Albromet W130; design of experiment; machining parameters
[vysledek_datum] => 2024-11-14T00:00:00+01:00
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[nazev] => The Machinability of Different Albromet W130 Plates Thicknesses by WEDM to the Required Surface Roughness Value
[nazev_orig] => The Machinability of Different Albromet W130 Plates Thicknesses by WEDM to the Required Surface Roughness Value
[duvernost_udaju_id] => S
[popis] => Wire Electrical Discharge Machining (WEDM) technology represents an unconventional but vital manufacturing technology in many different industrial branches. The automotive industry and its many significant requirements bring the need to manufacture inserts and mould segments for plastic injections from Albromet W130 material, with a required roughness, Ra, from 4.5 to 5 mu m so that subsequent profile etching can be eliminated. A planned experiment of 60 rounds was carried out to discover the optimal machining parameters, namely, the pulse-off time, gap voltage, discharge current, pulse-on time, and wire speed in order for the thickness of 10 to 100 mm (after 10 mm) to demonstrate the required roughness. The goal was to evaluate the surface roughness, maximise the cutting speed, and manufacture it without surface or subsurface defects. The evaluation of the planned experiment led to the establishment of optimised WEDM machining parameters with which thicknesses of 10-100 mm will always be produced with the required roughness, Ra, from 4.5 to 5 mu m and with the highest possible cutting speed. It was also proven that the machining does not lead to surface or subsurface defects, and thus, the service life of the manufactured parts will not be affected.
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[klicova_slova] => WEDM; wire electrical discharge machining; thicknesses; Albromet W130; design of experiment; surface roughness
[klicova_slova_orig] => WEDM; wire electrical discharge machining; thicknesses; Albromet W130; design of experiment; surface roughness
[url] => https://pmc.ncbi.nlm.nih.gov/articles/PMC11595453/
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[citace_text] => MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; FRIES, J, MANOVÁ, A. The Machinability of Different Albromet W130 Plates Thicknesses by WEDM to the Required Surface Roughness Value. Materials, 2024, vol. 17, no. 22, p. 1-19. ISSN: 1996-1944.
[citace_html] => MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; FRIES, J, MANOVÁ, A. The Machinability of Different Albromet W130 Plates Thicknesses by WEDM to the Required Surface Roughness Value. Materials, 2024, vol. 17, no. 22, p. 1-19. ISSN: 1996-1944.
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author="Kateřina {Mouralová} and Libor {Beneš} and Radim {Zahradníček} and Jiří {Fries} and Andrea {Manová}",
title="The Machinability of Different Albromet W130 Plates Thicknesses by WEDM to the Required Surface Roughness Value",
journal="Materials",
year="2024",
volume="17",
number="22",
pages="1--19",
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[popis_en] => Wire Electrical Discharge Machining (WEDM) technology represents an unconventional but vital manufacturing technology in many different industrial branches. The automotive industry and its many significant requirements bring the need to manufacture inserts and mould segments for plastic injections from Albromet W130 material, with a required roughness, Ra, from 4.5 to 5 mu m so that subsequent profile etching can be eliminated. A planned experiment of 60 rounds was carried out to discover the optimal machining parameters, namely, the pulse-off time, gap voltage, discharge current, pulse-on time, and wire speed in order for the thickness of 10 to 100 mm (after 10 mm) to demonstrate the required roughness. The goal was to evaluate the surface roughness, maximise the cutting speed, and manufacture it without surface or subsurface defects. The evaluation of the planned experiment led to the establishment of optimised WEDM machining parameters with which thicknesses of 10-100 mm will always be produced with the required roughness, Ra, from 4.5 to 5 mu m and with the highest possible cutting speed. It was also proven that the machining does not lead to surface or subsurface defects, and thus, the service life of the manufactured parts will not be affected.
[klicova_slova_en] => WEDM; wire electrical discharge machining; thicknesses; Albromet W130; design of experiment; surface roughness
[vysledek_datum] => 2024-12-06T00:00:00+01:00
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[nazev] => Ověřená technologie pro WEDM obrábění měděné slitiny ALBROMET W130
[nazev_orig] => Ověřená technologie pro WEDM obrábění měděné slitiny ALBROMET W130
[duvernost_udaju_id] => S
[popis] => Výstupem bude ověřená technologie v podobě optimálního nastavení parametrů stroje elektroerozivní drátové řezačky pro obrábění nově vyvinutého materiálu ALBROMET W130, s níž bude dosaženo požadované textury povrchu dle normy VDI 3402Blatt4 ve třídě 33 a zvýšení produktivity výroby v podobě zkrácení strojního času. Vytvořením textury ve třídě 33 tak bude znamenat odstranění následného procesu leptání.
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[klicova_slova] => WEDM; ALBROMET W130; VDI 3402Blatt4 33; optimální nastavení parametrů stroje
[klicova_slova_orig] => WEDM; ALBROMET W130; VDI 3402Blatt4 33; optimální nastavení parametrů stroje
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[citace_text] => DVOŘÁK, J; MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.: Ověřená technologie pro WEDM obrábění měděné slitiny ALBROMET W130. (Ověřená technologie)
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author="Kateřina {Mouralová} and Libor {Beneš} and Radim {Zahradníček}",
title="Ověřená technologie pro WEDM obrábění měděné slitiny ALBROMET W130",
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[nazev_en] => Proven technology for WEDM machining of copper alloy ALBROMET W130
[popis_en] => The output will be a proven technology in the form of optimal settings of the machine parameters of the wire electrical discharge machining for machining the newly developed ALBROMET W130 material, which will achieve the required surface texture according to the VDI 3402Blatt4 standard in class 33 and increase production productivity in the form of reduced machine time. Creating a texture in class 33 will thus mean eliminating the subsequent etching process.
[klicova_slova_en] => WEDM; ALBROMET W130; VDI 3402Blatt4 33; optimal setting of machine parameters
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[popis] => Funkčním vzorkem bude díl formy, který je vyroben z nově vyvinutého materiálu ALBROMET W130, užitím nastavení parametrů elektroerozivní drátové řezačky, které byly použity ve výsledku Ověřená technologie, která tomuto Funkčnímu vzorku předcházela. Výroba dílu formy pro vstřikování plastů bude efektivní s co možná nejnižším strojním časem, ovšem s přihlédnutím k požadované textuře povrchu. Funkční vzorek v podobě dílu formy bude mít texturu posuzovanou dle normy VDI 3402Blatt4 ve třídě 33.
[popis_orig] => Funkčním vzorkem bude díl formy, který je vyroben z nově vyvinutého materiálu ALBROMET W130, užitím nastavení parametrů elektroerozivní drátové řezačky, které byly použity ve výsledku Ověřená technologie, která tomuto Funkčnímu vzorku předcházela. Výroba dílu formy pro vstřikování plastů bude efektivní s co možná nejnižším strojním časem, ovšem s přihlédnutím k požadované textuře povrchu. Funkční vzorek v podobě dílu formy bude mít texturu posuzovanou dle normy VDI 3402Blatt4 ve třídě 33.
[klicova_slova] => část formy; ALBROMET W130; vstřikování plastů; elektroerozivní drátové řezání; snížení strojního času
[klicova_slova_orig] => část formy; ALBROMET W130; vstřikování plastů; elektroerozivní drátové řezání; snížení strojního času
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author="Kateřina {Mouralová} and Libor {Beneš} and Radim {Zahradníček}",
title="Díl formy vyrobený užitím optimálního nastavení parametrů elektroerozivní drátové řezačky",
year="2024",
note="Functioning sample"
}
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[nazev_en] => Mold part made using optimal wire electrical discharge machining parameter settings
[popis_en] => The functional sample will be a mold part made from the newly developed ALBROMET W130 material, using the wire electrical discharge machining parameter settings that were used in the Proven Technology result that preceded this Functional Sample. The production of the plastic injection mold part will be efficient with the lowest possible machine time, but taking into account the required surface texture. The functional sample in the form of a mold part will have a texture assessed according to the VDI 3402Blatt4 standard in class 33.
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[popis] => Wire Electric Discharge Machining (WEDM) is an unconventional machining technology that uses electrical impulses to generate very high temperatures to cut material. The WEDM process hence causes some unfortunate defects, such as cracks and burnt cavities, which can impact the correct functionality of the machined pieces and shorten their service life. This study was carried out to understand which materials remain defect-free after WEDM. The examined materials were the Ampcoloy 35 copper alloy, the high-entropy steels FeCoCrMnNi and FeCoCrMnNiC0.2, and the B1914 and Nimonic 263 nickel alloys. The influence of the machining parameters, namely the pulse off time, gap voltage, discharge current, pulse on time, and wire feed, on the cutting speed and the surface topography of the machined piece was investigated. The surface morphology, the state of the subsurface layer in a cross-section, and the number of diffused elements from the wire electrode were analysed. All the analysed materials were found completely suitable for WEDM machining as they do not form any surface or subsurface defects.
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[klicova_slova] => WEDM; wire electrical discharge machining; cracks; ampcoloy; high entropy alloy; B1914; nimonic
[klicova_slova_orig] => WEDM; wire electrical discharge machining; cracks; ampcoloy; high entropy alloy; B1914; nimonic
[url] => https://www.mdpi.com/2227-9717/12/11/2448
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[citace_text] => MOURALOVÁ, K.; FRIES, J.; BENEŠ, L.;HOUŠKA, P. Materials That Do Not Form Any Defects After WEDM. Processes, 2024, vol. 12, no. 11, p. 1-15. ISSN: 2227-9717.
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author="Kateřina {Mouralová} and Jiří {Fries} and Libor {Beneš} and Pavel {Houška}",
title="Materials That Do Not Form Any Defects After WEDM",
journal="Processes",
year="2024",
volume="12",
number="11",
pages="1--15",
doi="10.3390/pr12112448",
url="https://www.mdpi.com/2227-9717/12/11/2448"
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[popis] => Technical diagnostics is a separate scientific discipline focused on non-destructive methods of assessing the technical condition of objects and is one of the pillars of reliability and functionality of equipment. The definitions of technical diagnostics are based on various disciplines and standards, and technical diagnostics relies on the monitoring of diagnostic variables such as temperature, vibration, noise, and others. The paper further discusses the types of diagnostics, including vibrodiagnostics, thermodiagnostics, electrodiagnostics, etc., and their division into on-line and offline systems. The next section is focused on data evaluation, which is based on standards and methods, including frequency analysis and the use of artificial intelligence. The paper also discusses the use of cloud computing, edge computing, and risk theory, which can contribute significantly to the efficiency of diagnostic processes in the future. Finally, practical examples that have been solved at our department are presented. The first one is the use of the SIPLUS CMS1200 system for on-line vibration monitoring, which demonstrates its functionality and possibilities of use in industrial practice. The second example is the possibility of using neural networks in the processing and evaluation of measured data. The last example focuses on the application of risk theory in the evaluation of different diagnostic methods. The article aims to introduce the reader to the issues of technical diagnostics and then demonstrate possible approaches for practical solutions.
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[klicova_slova] => technical diagnostics, neural networks, vibrodiagnostics, condition monitoring, risks
[klicova_slova_orig] => technical diagnostics, neural networks, vibrodiagnostics, condition monitoring, risks
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[citace_rtf] =>
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author="Alena {Hájková} and Miloš {Hammer}",
title="Application of Modern Approaches to Solving Diagnostic Tasks in Industry",
booktitle="2024 21st International Conference on Mechatronics - Mechatronika (ME)",
year="2024",
series="21",
number="1",
pages="7",
publisher="IEEE",
address="Brno, Czech Republic",
doi="10.1109/ME61309.2024.10789654",
isbn="979-8-3503-9490-0",
url="https://ieeexplore.ieee.org/document/10789654"
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[popis] => The paper analyzes the effect of time slots on the correctness of packet delivery for selected media access conmedium access protocol), and X-MAC protocol (enhanced MAC protocol compared to B-MAC). In the study, reliability, and power consumption were used as indicators of the quality of the protocol variant. The length of the time slot was shown to affect the consumption of energy resources of the nodes. For all network sizes considered, it was shown that the best results were achieved by the L-MAC protocol, which also proved to be the most energyefficient with a low ratio of energy resource consumption. The X-MAC protocol has significant advantages and can be easily implemented on nodes running packet-switched wireless transceivers.
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[klicova_slova] => sensors; energy-efficient; WSN; B-MAC; X-MAC; LMAC; OMNeT++
[klicova_slova_orig] => sensors; energy-efficient; WSN; B-MAC; X-MAC; LMAC; OMNeT++
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[citace_text] => DYMORA, P.; MAZUREK, M.; ŁYCZKO, K.; HADAŠ, Z. Analysis of the time slot length impact of selected data link layer protocols on energy resource consumption in wireless sensor networks. Advances in Science and Technology-Research Journal, 2025, vol. 19, no. 2, p. 114-126. ISSN: 2299-8624.
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[citace_rtf] =>
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author="Paweł {Dymora} and Mirosław {Mazurek} and Kamil {Łyczko} and Zdeněk {Hadaš}",
title="Analysis of the time slot length impact of selected data link layer protocols on energy resource consumption in wireless sensor networks",
journal="Advances in Science and Technology-Research Journal",
year="2025",
volume="19",
number="2",
pages="114--126",
doi="10.12913/22998624/195706",
issn="2080-4075",
url="https://www.astrj.com/Analysis-of-the-time-slot-length-impact-of-selected-data-link-layer-protocols-on,195706,0,2.html"
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[nazev_en] => Analysis of the time slot length impact of selected data link layer protocols on energy resource consumption in wireless sensor networks
[popis_en] => The paper analyzes the effect of time slots on the correctness of packet delivery for selected media access conmedium access protocol), and X-MAC protocol (enhanced MAC protocol compared to B-MAC). In the study, reliability, and power consumption were used as indicators of the quality of the protocol variant. The length of the time slot was shown to affect the consumption of energy resources of the nodes. For all network sizes considered, it was shown that the best results were achieved by the L-MAC protocol, which also proved to be the most energyefficient with a low ratio of energy resource consumption. The X-MAC protocol has significant advantages and can be easily implemented on nodes running packet-switched wireless transceivers.
[klicova_slova_en] => sensors; energy-efficient; WSN; B-MAC; X-MAC; LMAC; OMNeT++
[vysledek_datum] => 2025-01-01T00:00:00+01:00
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