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[nazev] => Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining
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[popis] => The article introduces a method for fatigue lifetime predictions of notched specimens. The method uses fracture stresses of smooth and notched specimens with notch radius r = 0.2 mm. These two sets of experimental data are evaluated with the knowledge of axial stress distributions of the notched specimens using average stress over a length parameter l. This parameter l is considered to be a material characteristic (depending on the number of cycles to failure) and can be used for lifetime predictions of notched specimens with various notch radii. The predictions are compared to experimental data and analyzed. There is a strong influence of the process of machining of notches, which can lead to fatigue failure earlier than predicted. The data are evaluated in the area of high cycle fatigue and gigacycle fatigue.
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[nazev_en] => Connection system of a miniaturized control and power electronics of the converter
[popis_en] => The technical solution concerns the issue of power supply and PMSM (Permanent magnet synchronous motor) high-speed synchronous motor with permanent magnets.
[klicova_slova_en] => motor with permanent magnets, miniaturized control and power electronics
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[nazev] => Mass sensing using micromechanical resonators operating in nonlinear regime
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[popis] => The contribution deals with a numerical modelling and analysis of micro/nano-mechanical resonators operating in the non-linear regime which is intended to be utilized for an enhancement of the resonator sensing range eventually its sensitivity. Standardly the mass spectrometry is performed using the linearly operated resonators, which have however number of limitations. One of the main is a low accuracy of mass detection when particle is too heavy or light with respect to the resonator mass. An alternative way to this approach solving the mentioned drawback is presented here. The particle mass is characterized just from the change of the first resonant frequency and from the maximal vibrational amplitude in the resonators center upon crossing the resonant frequency. Attention is paid also to an analysis of the resonatoŕs mechanical reliability upon its operation.
[popis_orig] => The contribution deals with a numerical modelling and analysis of micro/nano-mechanical resonators operating in the non-linear regime which is intended to be utilized for an enhancement of the resonator sensing range eventually its sensitivity. Standardly the mass spectrometry is performed using the linearly operated resonators, which have however number of limitations. One of the main is a low accuracy of mass detection when particle is too heavy or light with respect to the resonator mass. An alternative way to this approach solving the mentioned drawback is presented here. The particle mass is characterized just from the change of the first resonant frequency and from the maximal vibrational amplitude in the resonators center upon crossing the resonant frequency. Attention is paid also to an analysis of the resonatoŕs mechanical reliability upon its operation.
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[url] => https://ieeexplore.ieee.org/document/9983052
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[citace_text] => VENSKÝ, J.; ŠEVEČEK, O.; SKALKA, P.; KOTOUL, M.; STACHIV, I. Mass sensing using micromechanical resonators operating in nonlinear regime. In 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen, Czech Republic: IEEE, 2022. 4 p. ISBN: 978-1-6654-1040-3.
[citace_html] => VENSKÝ, J.; ŠEVEČEK, O.; SKALKA, P.; KOTOUL, M.; STACHIV, I. Mass sensing using micromechanical resonators operating in nonlinear regime. In 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen, Czech Republic: IEEE, 2022. 4 p. ISBN: 978-1-6654-1040-3.
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author="Jiří {Venský} and Oldřich {Ševeček} and Petr {Skalka} and Michal {Kotoul} and Ivo {Stachiv}",
title="Mass sensing using micromechanical resonators operating in nonlinear regime",
booktitle="2022 20th International Conference on Mechatronics - Mechatronika (ME)",
year="2022",
pages="4",
publisher="IEEE",
address="Pilsen, Czech Republic",
doi="10.1109/ME54704.2022.9983052",
isbn="978-1-6654-1040-3",
url="https://ieeexplore.ieee.org/document/9983052"
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[popis] => In the present paper, the interface crack between two dissimilar dielectric materials under a mechanical load is investigated with including flexoelectricity effects. Flexoelectricity is a size dependent electro-mechanical coupling phenomenon, where the electric polarization is induced by a strain gradient in dielectrics. The strain gradients may potentially break the inversion symmetry in centrosymmetric crystals and polarization is observed even in all dielectric mate-rials. The polarization is proportional to the strain gradients in the direct flexoelectricity. Layered composite structures are frequently utilized in microelectronics. Due to a poor adhesion of pro-tection layer and basic material, the interface crack can be created there and for the prediction of failure of these structures it becomes essential to investigate distribution of the interfacial stress and strain fields. Governing equations in the gradient theory contain higher-order derivatives than in the standard continuum mechanics. Therefore, a reliable computational tool is required to solve these boundary-value problems. The mixed finite element method (FEM) is developed, where the standard C0 continuous finite elements are utilized for independent approximations of displacements and strains. The constraints between the displacement gradients and strains are satisfied by collocation at Gaussian integration points inside elements. In numerical examples, a parametric study is performed with respect to flexoelectric and elastic coefficients for both ma-terial regions. The influence of these parameters on the crack opening displacement is discussed.
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title="Application of the gradient theory to interface crack between two dissimilar dielectric materials",
journal="ENGINEERING FRACTURE MECHANICS",
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volume="276",
number="B",
pages="108895--108895",
doi="10.1016/j.engfracmech.2022.108895",
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[nazev] => Funkční vzorek elektrického palivového čerpadla pro paliva používaná v moderních raketových nosičích nových generací motorů o výkonové třídě nad 10 kN
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title="Funkční vzorek elektrického palivového čerpadla pro paliva používaná v moderních raketových nosičích nových generací motorů o výkonové třídě nad 10 kN",
year="2022",
note="Functioning sample"
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[quotations] => VENSKÝ, J.; ŠEVEČEK, O.; SKALKA, P.; KOTOUL, M.; STACHIV, I.
[title] => Mass sensing using micromechanical resonators operating in nonlinear regime
[typ] => PV
[year] => 2022
[id_vav] => 182226
)
[8] => Array
(
[quotations] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T.
[title] => Application of the gradient theory to interface crack between two dissimilar dielectric materials
[typ] => PV
[year] => 2022
[id_vav] => 182420
)
[9] => Array
(
[quotations] => NÁVRAT, T.; ŠTEFAN, D.; POKORNÝ, J.; POPELKA, M.; SIKORA, T.; KOZÁK, J.; PAVLÍK, O.; VAJDÁK, M.
[title] => Funkční vzorek elektrického palivového čerpadla pro paliva používaná v moderních raketových nosičích nových generací motorů o výkonové třídě nad 10 kN
[typ] => AV
[year] => 2022
[id_vav] => 182424
)
[10] => Array
(
[quotations] => NÁVRAT, T.; POKORNÝ, J.; VÁŇA, P.; AXMAN, V.; KADLECOVÁ, L.; PAVLÍK, O.; VAJDÁK, M.
[title] => Funkční vzorek miniaturizované řídicí a silové elektroniky pro palivové čerpadlo pro motory o výkonové třídě nad 10 kN
[typ] => AV
[year] => 2022
[id_vav] => 182427
)
[11] => Array
(
[quotations] => SHEN, D.; CHIN, H.; TU, C.; CHIH, J.; VENGLÁŘ, V.; CHEN, K.; KREJSA, J.; VECHET, S.
[title] => Navigation and Task Planning of a Mobile Robot under ROS Environment: A Case Study Using AutoRace Challenge
[typ] => PV
[year] => 2021
[id_vav] => 182465
)
[12] => Array
(
[quotations] => PAN, S., CHEN, K.; VĚCHET, S.
[title] => Design and Control of an Active Stage for Suppressing Motion Induced Vibration in Optical Inspection Systems
[typ] => PV
[year] => 2022
[id_vav] => 182474
)
)
)