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[nazev] => A Finite Element Bendo-Tensegrity Model of Eukaryotic Cell
[nazev_orig] => A Finite Element Bendo-Tensegrity Model of Eukaryotic Cell
[duvernost_udaju_id] => S
[popis] => Mechanical interaction of cell with extracellular environment affects its function. The mechanisms by which mechanical stimuli are sensed and transduced into biochemical responses are still not well understood. Considering this, two finite element (FE) bendo-tensegrity models of a cell in different states are proposed with the aim to characterize cell deformation under different mechanical loading conditions: a suspended cell model elucidating the global response of cell in tensile test simulation and an adherent cell model explicating its local response in atomic force microscopy (AFM) indentation simulation. The force-elongation curve obtained from tensile test simulation lies within the range of experimentally obtained characteristics of smooth muscle cells (SMCs) and illustrates a nonlinear increase in reaction force with cell stretching. The force-indentation curves obtained from indentation simulations lie within the range of experimentally obtained curves of embryonic stem cells (ESCs) and exhibit the influence of indentation site on the overall reaction force of cell. Simulation results have demonstrated that actin filaments (AFs) and microtubules (MTs) play a crucial role in the cell stiffness during stretching, whereas actin cortex (AC) along with actin bundles (ABs) and MTs are essential for the cell rigidity during indentation. The proposed models quantify the mechanical contribution of individual cytoskeletal components to cell mechanics and the deformation of nucleus under different mechanical loading conditions. These results can aid in better understanding of structure-function relationships in living cells.
[popis_orig] => Mechanical interaction of cell with extracellular environment affects its function. The mechanisms by which mechanical stimuli are sensed and transduced into biochemical responses are still not well understood. Considering this, two finite element (FE) bendo-tensegrity models of a cell in different states are proposed with the aim to characterize cell deformation under different mechanical loading conditions: a suspended cell model elucidating the global response of cell in tensile test simulation and an adherent cell model explicating its local response in atomic force microscopy (AFM) indentation simulation. The force-elongation curve obtained from tensile test simulation lies within the range of experimentally obtained characteristics of smooth muscle cells (SMCs) and illustrates a nonlinear increase in reaction force with cell stretching. The force-indentation curves obtained from indentation simulations lie within the range of experimentally obtained curves of embryonic stem cells (ESCs) and exhibit the influence of indentation site on the overall reaction force of cell. Simulation results have demonstrated that actin filaments (AFs) and microtubules (MTs) play a crucial role in the cell stiffness during stretching, whereas actin cortex (AC) along with actin bundles (ABs) and MTs are essential for the cell rigidity during indentation. The proposed models quantify the mechanical contribution of individual cytoskeletal components to cell mechanics and the deformation of nucleus under different mechanical loading conditions. These results can aid in better understanding of structure-function relationships in living cells.
[klicova_slova] => cytoskeleton; finite element modeling; bendo-tensegrity; mechanotransduction
[klicova_slova_orig] => cytoskeleton; finite element modeling; bendo-tensegrity; mechanotransduction
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[citace_text] => BANSOD, Y.; MATSUMOTO, T.; NAGAYAMA, K.; BURŠA, J. A Finite Element Bendo-Tensegrity Model of Eukaryotic Cell. JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, 2018, vol. 140, no. 10, p. 1-9. ISSN: 0148-0731.
[citace_html] => BANSOD, Y.; MATSUMOTO, T.; NAGAYAMA, K.; BURŠA, J. A Finite Element Bendo-Tensegrity Model of Eukaryotic Cell. JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, 2018, vol. 140, no. 10, p. 1-9. ISSN: 0148-0731.
[citace_rtf] =>
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author="BANSOD, Y. and MATSUMOTO, T. and NAGAYAMA, K. and BURŠA, J.",
title="A Finite Element Bendo-Tensegrity Model of Eukaryotic Cell",
journal="JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME",
year="2018",
volume="140",
number="10",
pages="1--9",
doi="10.1115/1.4040246",
issn="0148-0731",
url="http://biomechanical.asmedigitalcollection.asme.org/article.aspx?articleid=2681670"
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[nazev] => Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
[nazev_orig] => Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
[duvernost_udaju_id] => S
[popis] => Biomechanics-based assessment of Abdominal Aortic Aneurysm (AAA) rupture risk has gained considerable scientific and clinical momentum. However, computation of peak wall stress (PWS) using state-of-the-art finite element models is time demanding. This study investigates which features of the constitutive description of AAA wall are decisive for achieving acceptable stress predictions in it. Influence of five different isotropic constitutive descriptions of AAA wall is tested; models reflect realistic non-linear, artificially stiff non-linear, or artificially stiff pseudo-linear constitutive descriptions of AAA wall. Influence of the AAA wall model is tested on idealized (n=4) and patient-specific (n=16) AAA geometries. Wall stress computations consider a (hypothetical) load-free configuration and include residual stresses homogenizing the stresses across the wall. Wall stress differences amongst the different descriptions were statistically analyzed. When the qualitatively similar non-linear response of the AAA wall with low initial stiffness and subsequent strain stiffening was taken into consideration, wall stress (and PWS) predictions did not change significantly. Keeping this non-linear feature when using an artificially stiff wall can save up to 30% of the computational time, without significant change in PWS. In contrast, a stiff pseudo-linear elastic model may underestimate the PWS and is not reliable for AAA wall stress computations.
[popis_orig] => Biomechanics-based assessment of Abdominal Aortic Aneurysm (AAA) rupture risk has gained considerable scientific and clinical momentum. However, computation of peak wall stress (PWS) using state-of-the-art finite element models is time demanding. This study investigates which features of the constitutive description of AAA wall are decisive for achieving acceptable stress predictions in it. Influence of five different isotropic constitutive descriptions of AAA wall is tested; models reflect realistic non-linear, artificially stiff non-linear, or artificially stiff pseudo-linear constitutive descriptions of AAA wall. Influence of the AAA wall model is tested on idealized (n=4) and patient-specific (n=16) AAA geometries. Wall stress computations consider a (hypothetical) load-free configuration and include residual stresses homogenizing the stresses across the wall. Wall stress differences amongst the different descriptions were statistically analyzed. When the qualitatively similar non-linear response of the AAA wall with low initial stiffness and subsequent strain stiffening was taken into consideration, wall stress (and PWS) predictions did not change significantly. Keeping this non-linear feature when using an artificially stiff wall can save up to 30% of the computational time, without significant change in PWS. In contrast, a stiff pseudo-linear elastic model may underestimate the PWS and is not reliable for AAA wall stress computations.
[klicova_slova] => Abdominal aortic aneurysm, Wall stress, Non-linear material model
[klicova_slova_orig] => Abdominal aortic aneurysm, Wall stress, Non-linear material model
[url] => https://www.sciencedirect.com/science/article/pii/S1350453318300080?via%3Dihub
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[citace_text] => MAN, V.; POLZER, S.; GASSER, T.; NOVOTNÝ, T.; BURŠA, J. Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms. MEDICAL ENGINEERING & PHYSICS, 2018, vol. 53, no. 1, p. 49-57. ISSN: 1350-4533.
[citace_html] => MAN, V.; POLZER, S.; GASSER, T.; NOVOTNÝ, T.; BURŠA, J. Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms. MEDICAL ENGINEERING & PHYSICS, 2018, vol. 53, no. 1, p. 49-57. ISSN: 1350-4533.
[citace_rtf] =>
[citace_bibtex] => @article{BUT152171,
author="MAN, V. and POLZER, S. and GASSER, T. and NOVOTNÝ, T. and BURŠA, J.",
title="Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms",
journal="MEDICAL ENGINEERING & PHYSICS",
year="2018",
volume="53",
number="1",
pages="49--57",
doi="10.1016/j.medengphy.2018.01.002",
issn="1350-4533",
url="https://www.sciencedirect.com/science/article/pii/S1350453318300080?via%3Dihub"
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[nazev_en] => Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
[popis_en] => Biomechanics-based assessment of Abdominal Aortic Aneurysm (AAA) rupture risk has gained considerable scientific and clinical momentum. However, computation of peak wall stress (PWS) using state-of-the-art finite element models is time demanding. This study investigates which features of the constitutive description of AAA wall are decisive for achieving acceptable stress predictions in it. Influence of five different isotropic constitutive descriptions of AAA wall is tested; models reflect realistic non-linear, artificially stiff non-linear, or artificially stiff pseudo-linear constitutive descriptions of AAA wall. Influence of the AAA wall model is tested on idealized (n=4) and patient-specific (n=16) AAA geometries. Wall stress computations consider a (hypothetical) load-free configuration and include residual stresses homogenizing the stresses across the wall. Wall stress differences amongst the different descriptions were statistically analyzed. When the qualitatively similar non-linear response of the AAA wall with low initial stiffness and subsequent strain stiffening was taken into consideration, wall stress (and PWS) predictions did not change significantly. Keeping this non-linear feature when using an artificially stiff wall can save up to 30% of the computational time, without significant change in PWS. In contrast, a stiff pseudo-linear elastic model may underestimate the PWS and is not reliable for AAA wall stress computations.
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[nazev] => Compensation of Linear Acceleration in Single-Mass MEMS Gyroscope
[nazev_orig] => Compensation of Linear Acceleration in Single-Mass MEMS Gyroscope
[duvernost_udaju_id] => S
[popis] => Single mass MEMS gyroscopes suffer from significant sensitivity to linear acceleration also known as gsensitivity. In the case of multi-axis inertia measurement unit (IMU), we could benefit from direct acceleration measurement to suppress the influence of linear acceleration on gyroscope output. In this paper, we will derive a gyroscope dynamic model, pointing out the influence of linear acceleration, evaluate
the performance of common fusion algorithm and suggest a method for compensation of linear acceleration sensitivity using artificial neural network (ANN). The neural network was designed as a nonlinear autoregressive neural network with external input (NARX). The proposed method is experimentally
tested on the real system with emphasis on tilt estimation. A comparison of tilt measurement against tilt estimator based on ANN and conventional fusion algorithm is made. Results suggest that the accuracy was improved with the proposed ANN.
[popis_orig] => Single mass MEMS gyroscopes suffer from significant sensitivity to linear acceleration also known as gsensitivity. In the case of multi-axis inertia measurement unit (IMU), we could benefit from direct acceleration measurement to suppress the influence of linear acceleration on gyroscope output. In this paper, we will derive a gyroscope dynamic model, pointing out the influence of linear acceleration, evaluate
the performance of common fusion algorithm and suggest a method for compensation of linear acceleration sensitivity using artificial neural network (ANN). The neural network was designed as a nonlinear autoregressive neural network with external input (NARX). The proposed method is experimentally
tested on the real system with emphasis on tilt estimation. A comparison of tilt measurement against tilt estimator based on ANN and conventional fusion algorithm is made. Results suggest that the accuracy was improved with the proposed ANN.
[klicova_slova] => ANN; artificial neural network; gyroscope; gsensitivity; IMU; linear acceleration; MEMS; NARX; sensor fusion
[klicova_slova_orig] => ANN; artificial neural network; gyroscope; gsensitivity; IMU; linear acceleration; MEMS; NARX; sensor fusion
[url] =>
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[citace_text] => SPÁČIL, T.; RAJCHL, M. Compensation of Linear Acceleration in Single-Mass MEMS Gyroscope. In PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME). 2019. p. 338-343. ISBN: 978-80-214-5542-9.
[citace_html] => SPÁČIL, T.; RAJCHL, M. Compensation of Linear Acceleration in Single-Mass MEMS Gyroscope. In PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME). 2019. p. 338-343. ISBN: 978-80-214-5542-9.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT152522,
author="Tomáš {Spáčil} and Matej {Rajchl}",
title="Compensation of Linear Acceleration in Single-Mass MEMS Gyroscope",
booktitle="PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME)",
year="2019",
pages="338--343",
isbn="978-80-214-5542-9"
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[poznamka_metriky] =>
[nazev_en] => Compensation of Linear Acceleration in Single-Mass MEMS Gyroscope
[popis_en] => Single mass MEMS gyroscopes suffer from significant sensitivity to linear acceleration also known as gsensitivity. In the case of multi-axis inertia measurement unit (IMU), we could benefit from direct acceleration measurement to suppress the influence of linear acceleration on gyroscope output. In this paper, we will derive a gyroscope dynamic model, pointing out the influence of linear acceleration, evaluate
the performance of common fusion algorithm and suggest a method for compensation of linear acceleration sensitivity using artificial neural network (ANN). The neural network was designed as a nonlinear autoregressive neural network with external input (NARX). The proposed method is experimentally
tested on the real system with emphasis on tilt estimation. A comparison of tilt measurement against tilt estimator based on ANN and conventional fusion algorithm is made. Results suggest that the accuracy was improved with the proposed ANN.
[klicova_slova_en] => ANN; artificial neural network; gyroscope; gsensitivity; IMU; linear acceleration; MEMS; NARX; sensor fusion
[vysledek_datum] => 2019-01-23T00:00:00+01:00
)
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(
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[nazev] => Inverse Model Approximation Using Iterative Method and Neural Networks with Practical Application for Unstable Nonlinear System Control
[nazev_orig] => Inverse Model Approximation Using Iterative Method and Neural Networks with Practical Application for Unstable Nonlinear System Control
[duvernost_udaju_id] => S
[popis] => In this paper a method for controlling and stabilizing an unstable nonlinear system using a NARX neural network is presented. It is difficult to design a common feedback controller or even perform system identification on unstable systems, more even so if these systems are nonlinear. To compensate for nonlinearity a feedforward controller is required. In this paper we present a method of estimating inverse model of the system for the feedforward controller using a NARX artificial neural network in an iterative approach which takes less time than methods commonly used and performs as good. This method is verified and tested on an
educational model of magnetic levitation of steel ball. Both static and dynamic forms of the inverse model are presented and evaluated with positive results.
[popis_orig] => In this paper a method for controlling and stabilizing an unstable nonlinear system using a NARX neural network is presented. It is difficult to design a common feedback controller or even perform system identification on unstable systems, more even so if these systems are nonlinear. To compensate for nonlinearity a feedforward controller is required. In this paper we present a method of estimating inverse model of the system for the feedforward controller using a NARX artificial neural network in an iterative approach which takes less time than methods commonly used and performs as good. This method is verified and tested on an
educational model of magnetic levitation of steel ball. Both static and dynamic forms of the inverse model are presented and evaluated with positive results.
[klicova_slova] => nonlinear system, control, unstable, neural network, inverse model, magnetic levitation, PID, feedforward control
[klicova_slova_orig] => nonlinear system, control, unstable, neural network, inverse model, magnetic levitation, PID, feedforward control
[url] =>
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[identifikator] => ISBN 978-80-214-5542-9
[identifikator_popis] => ISBN - PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME)
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[citace_text] => RAJCHL, M.; BRABLC, M. Inverse Model Approximation Using Iterative Method and Neural Networks with Practical Application for Unstable Nonlinear System Control. In PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME). 2019. p. 209-215. ISBN: 978-80-214-5542-9.
[citace_html] => RAJCHL, M.; BRABLC, M. Inverse Model Approximation Using Iterative Method and Neural Networks with Practical Application for Unstable Nonlinear System Control. In PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME). 2019. p. 209-215. ISBN: 978-80-214-5542-9.
[citace_rtf] =>
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author="Matej {Rajchl} and Martin {Brablc}",
title="Inverse Model Approximation Using Iterative Method and Neural Networks with Practical Application for Unstable Nonlinear System Control",
booktitle="PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME)",
year="2019",
pages="209--215",
isbn="978-80-214-5542-9"
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[poznamka_metriky] =>
[nazev_en] => Inverse Model Approximation Using Iterative Method and Neural Networks with Practical Application for Unstable Nonlinear System Control
[popis_en] => In this paper a method for controlling and stabilizing an unstable nonlinear system using a NARX neural network is presented. It is difficult to design a common feedback controller or even perform system identification on unstable systems, more even so if these systems are nonlinear. To compensate for nonlinearity a feedforward controller is required. In this paper we present a method of estimating inverse model of the system for the feedforward controller using a NARX artificial neural network in an iterative approach which takes less time than methods commonly used and performs as good. This method is verified and tested on an
educational model of magnetic levitation of steel ball. Both static and dynamic forms of the inverse model are presented and evaluated with positive results.
[klicova_slova_en] => nonlinear system, control, unstable, neural network, inverse model, magnetic levitation, PID, feedforward control
[vysledek_datum] => 2019-01-23T00:00:00+01:00
)
[4] => Array
(
[vysledek_id] => 152524
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[nazev] => FPGA Implementation of Multiplierless Low-Pass FIR Differentiator
[nazev_orig] => FPGA Implementation of Multiplierless Low-Pass FIR Differentiator
[duvernost_udaju_id] => S
[popis] => In this paper we present, that if we appropriately choose the parameters of the maximally flat FIR differentiator,
the coefficients of the filter will have a common divisor which is reciprocal to a power of two. That means that the entire filter can be implemented in a very cost-effective way using only shift and add operations, which is beneficial mainly when the filter is implemented on the FPGA. Proposed differentiator was implemented on an FPGA and tested in real time. At the end of the article we compare the FPGA resource utilization for the
proposed maximally-flat FIR differentiator and a differentiator designed using a common approach.
[popis_orig] => In this paper we present, that if we appropriately choose the parameters of the maximally flat FIR differentiator,
the coefficients of the filter will have a common divisor which is reciprocal to a power of two. That means that the entire filter can be implemented in a very cost-effective way using only shift and add operations, which is beneficial mainly when the filter is implemented on the FPGA. Proposed differentiator was implemented on an FPGA and tested in real time. At the end of the article we compare the FPGA resource utilization for the
proposed maximally-flat FIR differentiator and a differentiator designed using a common approach.
[klicova_slova] => differentiator, FPGA, multiplierless, FIR
[klicova_slova_orig] => differentiator, FPGA, multiplierless, FIR
[url] =>
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[vycet_osob] => SOVA, V.; BRABLC, M.; GREPL, R.
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[identifikator] => ISBN 978-80-214-5542-9
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[citace_text] => SOVA, V.; BRABLC, M.; GREPL, R. FPGA Implementation of Multiplierless Low-Pass FIR Differentiator. In PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME). 2019. p. 382-386. ISBN: 978-80-214-5542-9.
[citace_html] => SOVA, V.; BRABLC, M.; GREPL, R. FPGA Implementation of Multiplierless Low-Pass FIR Differentiator. In PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME). 2019. p. 382-386. ISBN: 978-80-214-5542-9.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT152524,
author="Václav {Sova} and Martin {Brablc} and Robert {Grepl}",
title="FPGA Implementation of Multiplierless Low-Pass FIR Differentiator",
booktitle="PROCEEDINGS OF THE 2018 18TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME)",
year="2019",
pages="382--386",
isbn="978-80-214-5542-9"
}
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[poznamka_metriky] =>
[nazev_en] => FPGA Implementation of Multiplierless Low-Pass FIR Differentiator
[popis_en] => In this paper we present, that if we appropriately choose the parameters of the maximally flat FIR differentiator,
the coefficients of the filter will have a common divisor which is reciprocal to a power of two. That means that the entire filter can be implemented in a very cost-effective way using only shift and add operations, which is beneficial mainly when the filter is implemented on the FPGA. Proposed differentiator was implemented on an FPGA and tested in real time. At the end of the article we compare the FPGA resource utilization for the
proposed maximally-flat FIR differentiator and a differentiator designed using a common approach.
[klicova_slova_en] => differentiator, FPGA, multiplierless, FIR
[vysledek_datum] => 2019-01-23T00:00:00+01:00
)
[5] => Array
(
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[nazev] => Optimization of the electro-mechanical response of the multilayer piezoelectric energy harvester
[nazev_orig] => Optimization of the electro-mechanical response of the multilayer piezoelectric energy harvester
[duvernost_udaju_id] => S
[popis] => In this contribution, a design of novel cantilever beam energy harvester, composed of several ceramic layers with introduced high residual stresses, is proposed. The main aim of residual stresses is to protect the piezoelectric layer from cracking during the service of the harvester. A way to optimize composition of the multilayer energy harvester to receive both high apparent fracture toughness of the structure and simultaneously high electrical power of the harvester during its operation is presented. Both an analytical and a numerical model of the vibrational energy harvester are developed for this purpose. The increased resistance to fracture is achieved by means of high compressive stresses in the external ceramic layers. The electrical power output of the harvester is further optimized with respect to connected resistive load and excitation acceleration of vibrations. It was found that the optimal resistive load also leads to lowest mechanical stresses in particular
laminate layers.
[popis_orig] => In this contribution, a design of novel cantilever beam energy harvester, composed of several ceramic layers with introduced high residual stresses, is proposed. The main aim of residual stresses is to protect the piezoelectric layer from cracking during the service of the harvester. A way to optimize composition of the multilayer energy harvester to receive both high apparent fracture toughness of the structure and simultaneously high electrical power of the harvester during its operation is presented. Both an analytical and a numerical model of the vibrational energy harvester are developed for this purpose. The increased resistance to fracture is achieved by means of high compressive stresses in the external ceramic layers. The electrical power output of the harvester is further optimized with respect to connected resistive load and excitation acceleration of vibrations. It was found that the optimal resistive load also leads to lowest mechanical stresses in particular
laminate layers.
[klicova_slova] => energy harvester, piezoelectric material, FEM, vibration
[klicova_slova_orig] => energy harvester, piezoelectric material, FEM, vibration
[url] => https://mechatronika.fel.cvut.cz/
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[vycet_osob] => MACHŮ, Z.; ŠEVEČEK, O.; MAJER, Z.; HADAŠ, Z.; KOTOUL, M.
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[citace_text] => MACHŮ, Z.; ŠEVEČEK, O.; MAJER, Z.; HADAŠ, Z.; KOTOUL, M. Optimization of the electro-mechanical response of the multilayer piezoelectric energy harvester. In Proceedings of the 2018 18th International Conference on Mechatronics – Mechatronika (ME). 1. Brno: Brno University of Technolgy, 2018, 2018. p. 143-148. ISBN: 978-80-214-5543-6.
[citace_html] => MACHŮ, Z.; ŠEVEČEK, O.; MAJER, Z.; HADAŠ, Z.; KOTOUL, M. Optimization of the electro-mechanical response of the multilayer piezoelectric energy harvester. In Proceedings of the 2018 18th International Conference on Mechatronics – Mechatronika (ME). 1. Brno: Brno University of Technolgy, 2018, 2018. p. 143-148. ISBN: 978-80-214-5543-6.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT153222,
author="Zdeněk {Machů} and Oldřich {Ševeček} and Zdeněk {Majer} and Zdeněk {Hadaš} and Michal {Kotoul}",
title="Optimization of the electro-mechanical response of the multilayer piezoelectric energy harvester",
booktitle="Proceedings of the 2018 18th International Conference on Mechatronics – Mechatronika (ME)",
year="2018",
series="1",
number="1",
pages="143--148",
publisher="Brno University of Technolgy, 2018",
address="Brno",
isbn="978-80-214-5543-6",
url="https://mechatronika.fel.cvut.cz/"
}
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[poznamka_metriky] =>
[nazev_en] => Optimization of the electro-mechanical response of the multilayer piezoelectric energy harvester
[popis_en] => In this contribution, a design of novel cantilever beam energy harvester, composed of several ceramic layers with introduced high residual stresses, is proposed. The main aim of residual stresses is to protect the piezoelectric layer from cracking during the service of the harvester. A way to optimize composition of the multilayer energy harvester to receive both high apparent fracture toughness of the structure and simultaneously high electrical power of the harvester during its operation is presented. Both an analytical and a numerical model of the vibrational energy harvester are developed for this purpose. The increased resistance to fracture is achieved by means of high compressive stresses in the external ceramic layers. The electrical power output of the harvester is further optimized with respect to connected resistive load and excitation acceleration of vibrations. It was found that the optimal resistive load also leads to lowest mechanical stresses in particular
laminate layers.
[klicova_slova_en] => energy harvester, piezoelectric material, FEM, vibration
[vysledek_datum] => 2018-12-05T00:00:00+01:00
)
[6] => Array
(
[vysledek_id] => 155282
[vysledek_druh_id] => CONPA
[ex_vysledek_id] => 130879
[vysledek_rok] => 2019
[nazev] => Coupled Modeling of Permanent Magnet Generator Cooling using CFD
[nazev_orig] => Coupled Modeling of Permanent Magnet Generator Cooling using CFD
[duvernost_udaju_id] => S
[popis] => The aim of this paper is to show the complex analysis of electric machine cooling, using a modern method based on computational fluid dynamics (CFD) and finite elements method (FEM). The main advantage of this solution are lower computational demands compared with commonly used approach based only on CFD analysis. This solution shows using of two simulations based on a coupled one-way solution. First, airflow in the machine was solved to determine velocities in the inner space of the machine. Then thermal analysis was done with respect to results from the flow analysis that was done in previous step. An experimental measurement was performed for verification of this approach and for identification of thermal properties of the machine. The goal is to assess the ventilation impact on the thermal properties of individual parts of the electric machine.
[popis_orig] => The aim of this paper is to show the complex analysis of electric machine cooling, using a modern method based on computational fluid dynamics (CFD) and finite elements method (FEM). The main advantage of this solution are lower computational demands compared with commonly used approach based only on CFD analysis. This solution shows using of two simulations based on a coupled one-way solution. First, airflow in the machine was solved to determine velocities in the inner space of the machine. Then thermal analysis was done with respect to results from the flow analysis that was done in previous step. An experimental measurement was performed for verification of this approach and for identification of thermal properties of the machine. The goal is to assess the ventilation impact on the thermal properties of individual parts of the electric machine.
[klicova_slova] => electric machine cooling; CFD analysis; thermal modeling; coupled modeling
[klicova_slova_orig] => electric machine cooling; CFD analysis; thermal modeling; coupled modeling
[url] =>
[oecd_obor_id] => 20303
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 107598
[schvaleno] => 2021-03-04
[vykazovat_riv] => 1
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[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => VLACH, R.; MUSIL, F.
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[korespondencni_autor] =>
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[znamka] =>
[kategorie_nazev] => Publikační výsledky
[druh_nazev] => Stať ve sborníku v databázi WoS či Scopus
[druh_popis] => Stať ve sborníku v databázi WoS či Scopus
[stav] => Schválený
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 978-80-214-5543-6
[identifikator_popis] => ISBN - 2018 18th International Conference on Mechatronics - Mechatronika (ME)
[riv_dodavka_id] => 2674
[riv_dodavka_oznaceni] => RIV19-TA0-26210___
[riv_dodavka_rok] => 2019
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[citace_text] => VLACH, R.; MUSIL, F. Coupled Modeling of Permanent Magnet Generator Cooling using CFD. In 2018 18th International Conference on Mechatronics - Mechatronika (ME). 1. 2019. p. 564-569. ISBN: 978-80-214-5543-6.
[citace_html] => VLACH, R.; MUSIL, F. Coupled Modeling of Permanent Magnet Generator Cooling using CFD. In 2018 18th International Conference on Mechatronics - Mechatronika (ME). 1. 2019. p. 564-569. ISBN: 978-80-214-5543-6.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT155282,
author="Radek {Vlach} and Filip {Musil}",
title="Coupled Modeling of Permanent Magnet Generator Cooling using CFD",
booktitle="2018 18th International Conference on Mechatronics - Mechatronika (ME)",
year="2019",
series="1",
pages="564--569",
isbn="978-80-214-5543-6"
}
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[nazev_en] => Coupled Modeling of Permanent Magnet Generator Cooling using CFD
[popis_en] => The aim of this paper is to show the complex analysis of electric machine cooling, using a modern method based on computational fluid dynamics (CFD) and finite elements method (FEM). The main advantage of this solution are lower computational demands compared with commonly used approach based only on CFD analysis. This solution shows using of two simulations based on a coupled one-way solution. First, airflow in the machine was solved to determine velocities in the inner space of the machine. Then thermal analysis was done with respect to results from the flow analysis that was done in previous step. An experimental measurement was performed for verification of this approach and for identification of thermal properties of the machine. The goal is to assess the ventilation impact on the thermal properties of individual parts of the electric machine.
[klicova_slova_en] => electric machine cooling; CFD analysis; thermal modeling; coupled modeling
[vysledek_datum] => 2019-01-24T00:00:00+01:00
)
[7] => Array
(
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[nazev] => Modelling of cracking of the ceramic foam specimen with a central notch under the tensile load
[nazev_orig] => Modelling of cracking of the ceramic foam specimen with a central notch under the tensile load
[duvernost_udaju_id] => S
[popis] => In this contribution, open cell ceramic foam structures composed of regular/irregular shape cells and containing macroscopic central notch/crack are investigated in terms of their cracking upon the tensile loading and their strength is predicted using the FE simulations. The developed model of the real ceramic foam specimen contains a central notch/crack and is subjected to a tension, resulting in a failure beginning at the tip of the notch. The work discusses an approach how to predict the critical failure load and also the crack path in the foam structure. Various cell irregularity and size of the macroscopic notch is considered in the investigations. Predictions of the foam structure cracking are performed using the beam element based FE model having characteristics of the real foam structure and by utilization of the stress criterion which considers failure of particular struts, when the maximal stress on them reaches the tensile strength of the ceramic material. Outputs from simulations are compared with available experimental observations and with an estimation of the critical failure load calculated using the developed analytical model.
[popis_orig] => In this contribution, open cell ceramic foam structures composed of regular/irregular shape cells and containing macroscopic central notch/crack are investigated in terms of their cracking upon the tensile loading and their strength is predicted using the FE simulations. The developed model of the real ceramic foam specimen contains a central notch/crack and is subjected to a tension, resulting in a failure beginning at the tip of the notch. The work discusses an approach how to predict the critical failure load and also the crack path in the foam structure. Various cell irregularity and size of the macroscopic notch is considered in the investigations. Predictions of the foam structure cracking are performed using the beam element based FE model having characteristics of the real foam structure and by utilization of the stress criterion which considers failure of particular struts, when the maximal stress on them reaches the tensile strength of the ceramic material. Outputs from simulations are compared with available experimental observations and with an estimation of the critical failure load calculated using the developed analytical model.
[klicova_slova] => Ceramic foam; notch; fracture; FE model; Kelvin cell; tensile test.
[klicova_slova_orig] => Ceramic foam; notch; fracture; FE model; Kelvin cell; tensile test.
[url] => https://www.sciencedirect.com/science/article/pii/S0167844218306232?via%3Dihub
[oecd_obor_id] => 20302
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
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[schvaleno] => 2019-08-08
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[vycet_osob] => ŠEVEČEK, O.; BERTOLLA, L.; CHLUP, Z.; ŘEHOŘEK, L.; MAJER, Z.; MARCIÁN, P.; KOTOUL, M.
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[kod_doi] => 10.1016/j.tafmec.2019.01.024
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[stav] => Schválený
[vysledek_kategorie_id] => PV
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[identifikator] => ISSN 0167-8442
[identifikator_popis] => ISSN - THEORETICAL AND APPLIED FRACTURE MECHANICS (NL)
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[citace_text] => ŠEVEČEK, O.; BERTOLLA, L.; CHLUP, Z.; ŘEHOŘEK, L.; MAJER, Z.; MARCIÁN, P.; KOTOUL, M. Modelling of cracking of the ceramic foam specimen with a central notch under the tensile load. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2019, vol. 100, no. 1, p. 242-250. ISSN: 0167-8442.
[citace_html] => ŠEVEČEK, O.; BERTOLLA, L.; CHLUP, Z.; ŘEHOŘEK, L.; MAJER, Z.; MARCIÁN, P.; KOTOUL, M. Modelling of cracking of the ceramic foam specimen with a central notch under the tensile load. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2019, vol. 100, no. 1, p. 242-250. ISSN: 0167-8442.
[citace_rtf] =>
[citace_bibtex] => @article{BUT155948,
author="Oldřich {Ševeček} and Luca {Bertolla} and Zdeněk {Chlup} and Lukáš {Řehořek} and Zdeněk {Majer} and Petr {Marcián} and Michal {Kotoul}",
title="Modelling of cracking of the ceramic foam specimen with a central notch under the tensile load",
journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2019",
volume="100",
number="1",
pages="242--250",
doi="10.1016/j.tafmec.2019.01.024",
issn="0167-8442",
url="https://www.sciencedirect.com/science/article/pii/S0167844218306232?via%3Dihub"
}
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[poznamka_metriky] =>
[nazev_en] => Modelling of cracking of the ceramic foam specimen with a central notch under the tensile load
[popis_en] => In this contribution, open cell ceramic foam structures composed of regular/irregular shape cells and containing macroscopic central notch/crack are investigated in terms of their cracking upon the tensile loading and their strength is predicted using the FE simulations. The developed model of the real ceramic foam specimen contains a central notch/crack and is subjected to a tension, resulting in a failure beginning at the tip of the notch. The work discusses an approach how to predict the critical failure load and also the crack path in the foam structure. Various cell irregularity and size of the macroscopic notch is considered in the investigations. Predictions of the foam structure cracking are performed using the beam element based FE model having characteristics of the real foam structure and by utilization of the stress criterion which considers failure of particular struts, when the maximal stress on them reaches the tensile strength of the ceramic material. Outputs from simulations are compared with available experimental observations and with an estimation of the critical failure load calculated using the developed analytical model.
[klicova_slova_en] => Ceramic foam; notch; fracture; FE model; Kelvin cell; tensile test.
[vysledek_datum] => 2019-01-25T00:00:00+01:00
)
[8] => Array
(
[vysledek_id] => 155985
[vysledek_druh_id] => ARTWOS
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[nazev] => Microcrack interaction with circular inclusion and interfacial zone
[nazev_orig] => Microcrack interaction with circular inclusion and interfacial zone
[duvernost_udaju_id] => S
[popis] => A geometrically simplified plane elasticity problem of a finitesmall crack emanating from a thin interfacial zone surrounding the circularinclusion situated in the finite bounded domain is investigated. The crack isarbitrarily oriented and modelled using the distribution dislocation technique.This model represents the inner solution of the studied problem. Thecorresponding fundamental solution is based on the application ofMuskhelishvili complex potentials in the form of the Laurent series. Thecoefficients of the series are evaluated from the compatibility conditionsalong the interfaces of the inclusion, the interfacial zone and the enclosingmatrix. The fundamental solution is also used in the solution of the boundaryintegral method approximating the stress and strain relations of the so-calledouter solution. The asymptotic analysis at the point of the crack initiationcombines the inner and the outer solution and results in the evaluation of thestress intensity factors of the crack tip, which lies in the matrix. Thetopological derivative is subsequently used to approximate the energy releaserate field associated with the perturbing crack in the matrix. The extremevalues of the energy release rate allow one to assess the crack path directionof the initiated microcrack.
[popis_orig] => A geometrically simplified plane elasticity problem of a finitesmall crack emanating from a thin interfacial zone surrounding the circularinclusion situated in the finite bounded domain is investigated. The crack isarbitrarily oriented and modelled using the distribution dislocation technique.This model represents the inner solution of the studied problem. Thecorresponding fundamental solution is based on the application ofMuskhelishvili complex potentials in the form of the Laurent series. Thecoefficients of the series are evaluated from the compatibility conditionsalong the interfaces of the inclusion, the interfacial zone and the enclosingmatrix. The fundamental solution is also used in the solution of the boundaryintegral method approximating the stress and strain relations of the so-calledouter solution. The asymptotic analysis at the point of the crack initiationcombines the inner and the outer solution and results in the evaluation of thestress intensity factors of the crack tip, which lies in the matrix. Thetopological derivative is subsequently used to approximate the energy releaserate field associated with the perturbing crack in the matrix. The extremevalues of the energy release rate allow one to assess the crack path directionof the initiated microcrack.
[klicova_slova] => Crack path assessment; Complex potentials; Interfacial zone;Circular inclusion; Fundamental solution; Topological derivative
[klicova_slova_orig] => Crack path assessment; Complex potentials; Interfacial zone;Circular inclusion; Fundamental solution; Topological derivative
[url] => https://www.fracturae.com/index.php/fis/article/view/2297/2443
[oecd_obor_id] => 20301
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[originalni_jazyk] => en
[schvalil_id] => 51108
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[slozka_id] => 93314
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[vycet_osob] => PROFANT, T.; HRSTKA, M.; KLUSÁK, J.
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[tvurci_ids] =>
[poznamka] => https://www.fracturae.com/index.php/fis/article/view/2297
[typ_nazev] =>
[kod_doi] => 10.3221/IGF-ESIS.48.48
[kod_dspace] => 11012/180641
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[upravil] => Informační systém Automat
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[riv_dodavka_id] => 2045
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[citace_text] => PROFANT, T.; HRSTKA, M.; KLUSÁK, J. Microcrack interaction with circular inclusion and interfacial zone. Fracture and structural integrity, 2019, vol. 13, no. 48, p. 503-512. ISSN: 1971-8993.
[citace_html] => PROFANT, T.; HRSTKA, M.; KLUSÁK, J. Microcrack interaction with circular inclusion and interfacial zone. Fracture and structural integrity, 2019, vol. 13, no. 48, p. 503-512. ISSN: 1971-8993.
[citace_rtf] =>
[citace_bibtex] => @article{BUT155985,
author="Tomáš {Profant} and Miroslav {Hrstka} and Jan {Klusák}",
title="Microcrack interaction with circular inclusion and interfacial zone",
journal="Fracture and structural integrity",
year="2019",
volume="13",
number="48",
pages="503--512",
doi="10.3221/IGF-ESIS.48.48",
url="https://www.fracturae.com/index.php/fis/article/view/2297/2443"
}
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[nazev_en] => Microcrack interaction with circular inclusion and interfacial zone
[popis_en] => A geometrically simplified plane elasticity problem of a finitesmall crack emanating from a thin interfacial zone surrounding the circularinclusion situated in the finite bounded domain is investigated. The crack isarbitrarily oriented and modelled using the distribution dislocation technique.This model represents the inner solution of the studied problem. Thecorresponding fundamental solution is based on the application ofMuskhelishvili complex potentials in the form of the Laurent series. Thecoefficients of the series are evaluated from the compatibility conditionsalong the interfaces of the inclusion, the interfacial zone and the enclosingmatrix. The fundamental solution is also used in the solution of the boundaryintegral method approximating the stress and strain relations of the so-calledouter solution. The asymptotic analysis at the point of the crack initiationcombines the inner and the outer solution and results in the evaluation of thestress intensity factors of the crack tip, which lies in the matrix. Thetopological derivative is subsequently used to approximate the energy releaserate field associated with the perturbing crack in the matrix. The extremevalues of the energy release rate allow one to assess the crack path directionof the initiated microcrack.
[klicova_slova_en] => Crack path assessment; Complex potentials; Interfacial zone;Circular inclusion; Fundamental solution; Topological derivative
[vysledek_datum] => 2019-01-04T00:00:00+01:00
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[nazev] => ANALYSIS OF THE MANUFACTURE PERTURBATIONS OF THE TOTAL HIP REPLACEMENT
[nazev_orig] => ANALYSIS OF THE MANUFACTURE PERTURBATIONS OF THE TOTAL HIP REPLACEMENT
[duvernost_udaju_id] => S
[popis] => One type of total hip replacement function loss is acetabular cup loosening from the pelvic bone. This article examines manufacture deviations as one of the possible reasons for this kind of failure. Both dimensions and geometry manufacturing deviations of ceramic head and polyethylene cup were analyzed. We find that deviations in the variables analysed here affect considered values of contact pressure and frictional moment. Furthermore, contact pressure and frictional moment are quantities affecting replacement success and durability.
[popis_orig] => One type of total hip replacement function loss is acetabular cup loosening from the pelvic bone. This article examines manufacture deviations as one of the possible reasons for this kind of failure. Both dimensions and geometry manufacturing deviations of ceramic head and polyethylene cup were analyzed. We find that deviations in the variables analysed here affect considered values of contact pressure and frictional moment. Furthermore, contact pressure and frictional moment are quantities affecting replacement success and durability.
[klicova_slova] => Total hip replacement, FEM, roundness, contact pressure, frictional moment
[klicova_slova_orig] => Total hip replacement, FEM, roundness, contact pressure, frictional moment
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[citace_text] => KOUKAL, M. ANALYSIS OF THE MANUFACTURE PERTURBATIONS OF THE TOTAL HIP REPLACEMENT. In Engineering Mechanics 2017. Engineering Mechanics. Brno: VUT v Brně, 2017. p. 506-509. ISBN: 978-80-214-5497-2. ISSN: 1805-8248.
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booktitle="Engineering Mechanics 2017",
year="2017",
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number="ročník 23",
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[nazev_en] => ANALYSIS OF THE MANUFACTURE PERTURBATIONS OF THE TOTAL HIP REPLACEMENT
[popis_en] => One type of total hip replacement function loss is acetabular cup loosening from the pelvic bone. This article examines manufacture deviations as one of the possible reasons for this kind of failure. Both dimensions and geometry manufacturing deviations of ceramic head and polyethylene cup were analyzed. We find that deviations in the variables analysed here affect considered values of contact pressure and frictional moment. Furthermore, contact pressure and frictional moment are quantities affecting replacement success and durability.
[klicova_slova_en] => Total hip replacement, FEM, roundness, contact pressure, frictional moment
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[popis] => The present paper deals with the causes that gave rise to Bertalanffy's General Systems Theory and Brno philosophy of systems methodology. It analyses what is a systems conception of the selection of method for solving a specific problem that is completely ignored by the current university teaching practice.
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[popis] => The title and content of the present article seem to be thematically archaic, but the present knowledge about modelling as a tool for problem-solving is incredibly miserable; therefore, actually, the article is up to date. There are many individuals who are caught off by the question what exactly is, in that sense, the real essence of modelling, even though some of them write about it, and even teach it. In fact, the answer can be found in already the 27-year-old publication "Computational models in engineering practice" by the two authors from Brno. Three years ago, another publication "Systems Methodology" appeared in Brno (Janicek, 2014); it discusses modelling in terms of systems approach. These authors from Brno also published the book "Expert Engineering in systems approach", which is also dedicated to solving the problems by modelling. Literature sources thus exist; however, reading is not very popular, especially as for Czech subject-field books. Nevertheless, publications from the West do not always guarantee the quality of information and knowledge. Therefore, this article recapitulates the essence of modelling, its graphic display, types of modelling and terminology of modelling in Czech and English equivalents.
[popis_orig] => The title and content of the present article seem to be thematically archaic, but the present knowledge about modelling as a tool for problem-solving is incredibly miserable; therefore, actually, the article is up to date. There are many individuals who are caught off by the question what exactly is, in that sense, the real essence of modelling, even though some of them write about it, and even teach it. In fact, the answer can be found in already the 27-year-old publication "Computational models in engineering practice" by the two authors from Brno. Three years ago, another publication "Systems Methodology" appeared in Brno (Janicek, 2014); it discusses modelling in terms of systems approach. These authors from Brno also published the book "Expert Engineering in systems approach", which is also dedicated to solving the problems by modelling. Literature sources thus exist; however, reading is not very popular, especially as for Czech subject-field books. Nevertheless, publications from the West do not always guarantee the quality of information and knowledge. Therefore, this article recapitulates the essence of modelling, its graphic display, types of modelling and terminology of modelling in Czech and English equivalents.
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[popis_en] => The title and content of the present article seem to be thematically archaic, but the present knowledge about modelling as a tool for problem-solving is incredibly miserable; therefore, actually, the article is up to date. There are many individuals who are caught off by the question what exactly is, in that sense, the real essence of modelling, even though some of them write about it, and even teach it. In fact, the answer can be found in already the 27-year-old publication "Computational models in engineering practice" by the two authors from Brno. Three years ago, another publication "Systems Methodology" appeared in Brno (Janicek, 2014); it discusses modelling in terms of systems approach. These authors from Brno also published the book "Expert Engineering in systems approach", which is also dedicated to solving the problems by modelling. Literature sources thus exist; however, reading is not very popular, especially as for Czech subject-field books. Nevertheless, publications from the West do not always guarantee the quality of information and knowledge. Therefore, this article recapitulates the essence of modelling, its graphic display, types of modelling and terminology of modelling in Czech and English equivalents.
[klicova_slova_en] => Model; Essence of modelling; Structure of model; Types of modelling; Computational modelling
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[nazev] => STRESS ANALYSIS OF THE TOTAL REPLACEMENT OF THE TRAPEZIOMETACARPAL JOINT
[nazev_orig] => STRESS ANALYSIS OF THE TOTAL REPLACEMENT OF THE TRAPEZIOMETACARPAL JOINT
[duvernost_udaju_id] => S
[popis] => The article devotes to finite element analysis of the total replacement of the trapeziometacarpal (TMC) joint. Various types of analyzes were carried out dealing with influence of different geometry of the replacement. Apart from detailed models, more complex one including bones and ligaments was created to achieve more realistic conditions and thus, more trustworthy results. The goal of this study is to bring awareness about stress states depending on geometry of the replacement as well as provide an image of contact pressure distribution when loading the replacement.
[popis_orig] => The article devotes to finite element analysis of the total replacement of the trapeziometacarpal (TMC) joint. Various types of analyzes were carried out dealing with influence of different geometry of the replacement. Apart from detailed models, more complex one including bones and ligaments was created to achieve more realistic conditions and thus, more trustworthy results. The goal of this study is to bring awareness about stress states depending on geometry of the replacement as well as provide an image of contact pressure distribution when loading the replacement.
[klicova_slova] => Stress analysis; Finite element method; Trapeziometacarpal joint; Total replacement
[klicova_slova_orig] => Stress analysis; Finite element method; Trapeziometacarpal joint; Total replacement
[url] =>
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