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[popis] => This paper deals with an energy harvesting review and analysis of an ambient mechanical energy on a trackside during a passing of a train. Trains provide very high level of vibration and deformation which could be converted into useful electricity. Due to maintenance and safety reasons a rail trackside includes sensing systems and number of sensor nodes is increased for modern transportation. Recent development of modern communication and ultra-low power electronics allows to use energy harvesting systems as autonomous source of electrical energy for these trackside objects. Main aim of this paper is model-based design of proposed vibration energy harvesting systems inside sleeper and predict harvested power during the train passing. Measurements of passing train is used as input for simulation models and harvested power is calculated. This simulation of proposed energy harvesting device is very useful for future design.
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[citace_text] => HADAŠ, Z.; SMILEK, J.; RUBEŠ, O. Energy harvesting from passing train as source of energy for autonomous trackside objects. In The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV). MATEC web of conferences. 211. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
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[popis_orig] => The Cracked Round Bar (abbreviated as CRB in the following) test is used as standardized accelerated testing method for simple ranking of polyethylene pipes based on measuring number of cycles to failure of the cyclically loaded CRB specimen. It can also be used for the slow crack growth rate evaluation of the tested material. This paper deals with the issue of asymmetrically growing cracks in CRB specimens and possible influence of the asymmetry on the results of CRB tests, both the number of cycles to failure and the crack growth rates. It is assumed that the asymmetry is caused by presence of residual stress in the CRB specimens. In the first part of the paper, residual stress in two polyethylene pipes (produced using different extrusion speed) is investigated. Then CRB specimens made from these pipes are also examined regarding the residual stress and the results are compared. The found residual stress distributions are used as input for the following finite element method (FEM) simulation of crack growth in the CRB specimens. The FEM model results are then evaluated and fatigue crack growth rates for asymmetrically growing cracks are calculated. They are compared to the results for symmetrically growing cracks and influence on the results and its significance is discussed. In the end, CRB specimen lifetime prediction is carried out and the influence of the asymmetry on the obtained number of cycles to the failure is also addressed.
[klicova_slova] => Asymmetrical crack;Cracked round bar test;Fatigue crack growth rate;Polyethylene pipe;Residual stress
[klicova_slova_orig] => Asymmetrical crack;Cracked round bar test;Fatigue crack growth rate;Polyethylene pipe;Residual stress
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[citace_text] => PODUŠKA, J.; HUTAŘ, P.; FRANK, A.; KUČERA, J.; SADÍLEK, J.; PINTER, G.; NÁHLÍK, L. Numerical simulations of cracked round bar test: Effect of residual stresses and crack asymmetry. ENGINEERING FRACTURE MECHANICS, 2018, vol. 203, no. 2018, p. 18-31. ISSN: 0013-7944.
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[nazev_en] => Numerical simulations of cracked round bar test: Effect of residual stresses and crack asymmetry
[popis_en] => The Cracked Round Bar (abbreviated as CRB in the following) test is used as standardized accelerated testing method for simple ranking of polyethylene pipes based on measuring number of cycles to failure of the cyclically loaded CRB specimen. It can also be used for the slow crack growth rate evaluation of the tested material. This paper deals with the issue of asymmetrically growing cracks in CRB specimens and possible influence of the asymmetry on the results of CRB tests, both the number of cycles to failure and the crack growth rates. It is assumed that the asymmetry is caused by presence of residual stress in the CRB specimens. In the first part of the paper, residual stress in two polyethylene pipes (produced using different extrusion speed) is investigated. Then CRB specimens made from these pipes are also examined regarding the residual stress and the results are compared. The found residual stress distributions are used as input for the following finite element method (FEM) simulation of crack growth in the CRB specimens. The FEM model results are then evaluated and fatigue crack growth rates for asymmetrically growing cracks are calculated. They are compared to the results for symmetrically growing cracks and influence on the results and its significance is discussed. In the end, CRB specimen lifetime prediction is carried out and the influence of the asymmetry on the obtained number of cycles to the failure is also addressed.
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[popis] => The operation of railway axles should fulfill at least two main demands: safety and low operation costs. A significant part of operation costs is given by the length of regular inspection intervals which should reveal potential fatigue cracks in railway axle. The detection of cracks is of a probabilistic nature, therefore their detection is not ensured in all cases. For the safe operation of trains, an existence of potential initial crack should be considered on the axle surface and residual fatigue lifetime should be conservatively determined for this case. Reliable procedure of residual fatigue lifetime estimation should take into account real axle geometry, material characteristics and loading of the railway axle. This paper shows methodology for determination of residual fatigue lifetime (RFL) based on the fracture mechanics approach, taking into account real spectrum of the loading cycles, existence of press-fitted wheels and surface residual stresses given by the thermo-mechanical surface treatment of the railway axle. It is demonstrated that the effect of the residual stresses is significant and should not be neglected in the numerical estimation of residual fatigue lifetime of the axle.
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[klicova_slova] => railway axle; residual fatigue lifetime; residual stresses; inspection intervals; numerical simulation
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[nazev] => Biomechanical Study of Bone – Dental Implant Interactions Using Patient-Specific Approach and Multiscale Computational Modeling
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author="Petr {Marcián} and Barbora {Thomková} and Zdeněk {Florian} and Libor {Borák}",
title="Biomechanical Study of Bone – Dental Implant Interactions Using Patient-Specific Approach and Multiscale Computational Modeling",
booktitle="34th conference with international participation Computational Mechanics 2018",
year="2018",
pages="61--62",
address="University of West Bohemia",
isbn="978-80-261-0819-1",
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[nazev_orig] => Verified nonlinear model of piezoelectric energy harvester
[duvernost_udaju_id] => S
[popis] => Energy harvesting is an important topic today. Complex monitoring systems with many nodes need energy sources and vibration energy harvesters (VEHs) could be one type of them. Mathematical model of the VEH is necessary instrument to estimate possible harvested power. This paper deals with piezoelectric VEH in setting as cantilever beam with tip mass. Traditional linear model of this type of VEH is simple, however, it represents the VEH only in one operating point and in another one (another amplitude of excitation vibrations) it could return wrong results. The nonlinear model of VEH is introduced in this paper with its parameters estimation. The nonlinear model is compared with linear model and experiment to demonstrate difference between them in amplitude frequency characteristics. Finally, the average harvested power from harmonic vibrations is measured experimentally and compared with prediction from linear and nonlinear model.
[popis_orig] => Energy harvesting is an important topic today. Complex monitoring systems with many nodes need energy sources and vibration energy harvesters (VEHs) could be one type of them. Mathematical model of the VEH is necessary instrument to estimate possible harvested power. This paper deals with piezoelectric VEH in setting as cantilever beam with tip mass. Traditional linear model of this type of VEH is simple, however, it represents the VEH only in one operating point and in another one (another amplitude of excitation vibrations) it could return wrong results. The nonlinear model of VEH is introduced in this paper with its parameters estimation. The nonlinear model is compared with linear model and experiment to demonstrate difference between them in amplitude frequency characteristics. Finally, the average harvested power from harmonic vibrations is measured experimentally and compared with prediction from linear and nonlinear model.
[klicova_slova] => Energy Harvesting
[klicova_slova_orig] => Energy Harvesting
[url] => https://www.matec-https://www.matec-conferences.org/articles/matecconf/abs/2018/70/matecconf_vetomacxiv2018_05005/matecconf_vetomacxiv2018_05005.html
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[citace_text] => RUBEŠ, O.; BRABLC, M.; HADAŠ, Z. Verified nonlinear model of piezoelectric energy harvester. In The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV). MATEC web of conferences. 211. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
[citace_html] => RUBEŠ, O.; BRABLC, M.; HADAŠ, Z. Verified nonlinear model of piezoelectric energy harvester. In The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV). MATEC web of conferences. 211. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
[citace_rtf] =>
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author="Ondřej {Rubeš} and Martin {Brablc} and Zdeněk {Hadaš}",
title="Verified nonlinear model of piezoelectric energy harvester",
booktitle="The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV)",
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publisher="EDP Sciences",
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doi="10.1051/matecconf/201821105005",
issn="2274-7214",
url="https://www.matec-https://www.matec-conferences.org/articles/matecconf/abs/2018/70/matecconf_vetomacxiv2018_05005/matecconf_vetomacxiv2018_05005.html"
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[nazev_en] => Verified nonlinear model of piezoelectric energy harvester
[popis_en] => Energy harvesting is an important topic today. Complex monitoring systems with many nodes need energy sources and vibration energy harvesters (VEHs) could be one type of them. Mathematical model of the VEH is necessary instrument to estimate possible harvested power. This paper deals with piezoelectric VEH in setting as cantilever beam with tip mass. Traditional linear model of this type of VEH is simple, however, it represents the VEH only in one operating point and in another one (another amplitude of excitation vibrations) it could return wrong results. The nonlinear model of VEH is introduced in this paper with its parameters estimation. The nonlinear model is compared with linear model and experiment to demonstrate difference between them in amplitude frequency characteristics. Finally, the average harvested power from harmonic vibrations is measured experimentally and compared with prediction from linear and nonlinear model.
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(
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[nazev_orig] => Prediction of position-dependent stability lobes based on reduced virtual model
[duvernost_udaju_id] => S
[popis] => The stability of a machining process is directly affected by the dynamic response between the tool and the workpiece. However, as the tool moves along the path, the dynamic stiffness of the machine tool changes. To determine the position-dependent dynamic stiffness accurately, a computationally efficient methodology based on a complex virtual model is presented. The virtual model is assembled using Finite Element Method and is effectively reduced via Component Mode Synthesis and transformation to a State-Space Multi-Input-Multi-Output system. Combination of these techniques allows time-efficient response simulations with significantly less computational effort than the conventional full Finite Element models. Furthermore, they describe the behaviour of the complex structure more accurately opposed to the commonly used models based on a simple 1 Degree-of-Freedom systems. The reduced model is used to simulate dynamic response of the structure to a cutting force during operation. A response is measured on an existing machine to modify the virtual model by incorporating fuzzy parameters, such as damping. The stability regions are calculated for variable positions, resulting in position-dependent lobe diagrams. The presented approach can be used to create a map of stable zones to predict and prevent unstable behaviour during operation.
[popis_orig] => The stability of a machining process is directly affected by the dynamic response between the tool and the workpiece. However, as the tool moves along the path, the dynamic stiffness of the machine tool changes. To determine the position-dependent dynamic stiffness accurately, a computationally efficient methodology based on a complex virtual model is presented. The virtual model is assembled using Finite Element Method and is effectively reduced via Component Mode Synthesis and transformation to a State-Space Multi-Input-Multi-Output system. Combination of these techniques allows time-efficient response simulations with significantly less computational effort than the conventional full Finite Element models. Furthermore, they describe the behaviour of the complex structure more accurately opposed to the commonly used models based on a simple 1 Degree-of-Freedom systems. The reduced model is used to simulate dynamic response of the structure to a cutting force during operation. A response is measured on an existing machine to modify the virtual model by incorporating fuzzy parameters, such as damping. The stability regions are calculated for variable positions, resulting in position-dependent lobe diagrams. The presented approach can be used to create a map of stable zones to predict and prevent unstable behaviour during operation.
[klicova_slova] => Virtual modeling; Machine tools; Component Mode Synthesis
[klicova_slova_orig] => Virtual modeling; Machine tools; Component Mode Synthesis
[url] => https://www.matec-conferences.org/articles/matecconf/abs/2018/70/matecconf_vetomacxiv2018_17005/matecconf_vetomacxiv2018_17005.html
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[citace_text] => KŠICA, F.; HADAŠ, Z. Prediction of position-dependent stability lobes based on reduced virtual model. In 14th International Conference on Vibration Engineering and Technology of Machinery, VETOMAC 2018 Proceedings. MATEC web of conferences. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
[citace_html] => KŠICA, F.; HADAŠ, Z. Prediction of position-dependent stability lobes based on reduced virtual model. In 14th International Conference on Vibration Engineering and Technology of Machinery, VETOMAC 2018 Proceedings. MATEC web of conferences. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT151685,
author="Filip {Kšica} and Zdeněk {Hadaš}",
title="Prediction of position-dependent stability lobes based on reduced virtual model",
booktitle="14th International Conference on Vibration Engineering and Technology of Machinery, VETOMAC 2018 Proceedings",
year="2018",
journal="MATEC web of conferences",
number="211",
pages="1--6",
publisher="EDP Sciences",
address="Lisbon, Portugal",
doi="10.1051/matecconf/201821117005",
issn="2274-7214",
url="https://www.matec-conferences.org/articles/matecconf/abs/2018/70/matecconf_vetomacxiv2018_17005/matecconf_vetomacxiv2018_17005.html"
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[nazev_en] => Prediction of position-dependent stability lobes based on reduced virtual model
[popis_en] => The stability of a machining process is directly affected by the dynamic response between the tool and the workpiece. However, as the tool moves along the path, the dynamic stiffness of the machine tool changes. To determine the position-dependent dynamic stiffness accurately, a computationally efficient methodology based on a complex virtual model is presented. The virtual model is assembled using Finite Element Method and is effectively reduced via Component Mode Synthesis and transformation to a State-Space Multi-Input-Multi-Output system. Combination of these techniques allows time-efficient response simulations with significantly less computational effort than the conventional full Finite Element models. Furthermore, they describe the behaviour of the complex structure more accurately opposed to the commonly used models based on a simple 1 Degree-of-Freedom systems. The reduced model is used to simulate dynamic response of the structure to a cutting force during operation. A response is measured on an existing machine to modify the virtual model by incorporating fuzzy parameters, such as damping. The stability regions are calculated for variable positions, resulting in position-dependent lobe diagrams. The presented approach can be used to create a map of stable zones to predict and prevent unstable behaviour during operation.
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[nazev_orig] => Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion
[duvernost_udaju_id] => S
[popis] => This paper deals with the experimental performance evaluation of the prototype of a novel inertial energy harvester based on Tusi couple mechanism. The harvester was developed as an autonomous power source for environments with very low frequency and magnitude of mechanical vibrations available. The experiments were conducted using human body during different activities as a source of mechanical excitation, with the prospect of using the harvester for powering up future wearable electronic devices. Four different locations on a single measurement specimen were picked for the harvester placement-back of the head, belt, wrist and ankle. Measurements in each location comprised of walking on a straight and level path at natural speed, walking up and down the stairs, jumping, running, and location-specific activities that were expected to provide significant output power. The measured average output power of the device with dimensions 50x50x20 mm on empirically selected 2 kΩ electrical load reached up to 6.5 mW, obtained with the device attached to the ankle while shaking the leg.
[popis_orig] => This paper deals with the experimental performance evaluation of the prototype of a novel inertial energy harvester based on Tusi couple mechanism. The harvester was developed as an autonomous power source for environments with very low frequency and magnitude of mechanical vibrations available. The experiments were conducted using human body during different activities as a source of mechanical excitation, with the prospect of using the harvester for powering up future wearable electronic devices. Four different locations on a single measurement specimen were picked for the harvester placement-back of the head, belt, wrist and ankle. Measurements in each location comprised of walking on a straight and level path at natural speed, walking up and down the stairs, jumping, running, and location-specific activities that were expected to provide significant output power. The measured average output power of the device with dimensions 50x50x20 mm on empirically selected 2 kΩ electrical load reached up to 6.5 mW, obtained with the device attached to the ankle while shaking the leg.
[klicova_slova] => Energy harvesting
[klicova_slova_orig] => Energy harvesting
[url] => https://www.matec-https://www.matec-conferences.org/articles/matecconf/abs/2018/70/matecconf_vetomacxiv2018_05004/matecconf_vetomacxiv2018_05004.html
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[citace_text] => SMILEK, J.; HADAŠ, Z. Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion. In The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV). MATEC web of conferences. 211. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
[citace_html] => SMILEK, J.; HADAŠ, Z. Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion. In The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV). MATEC web of conferences. 211. Lisbon, Portugal: EDP Sciences, 2018. no. 211, p. 1-6. ISSN: 2261-236X.
[citace_rtf] =>
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author="Jan {Smilek} and Zdeněk {Hadaš}",
title="Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion",
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journal="MATEC web of conferences",
number="211",
pages="1--6",
publisher="EDP Sciences",
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doi="10.1051/matecconf/201821105004",
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[oecd_tree_podobor_nazev] => Applied mechanics
[poznamka_metriky] =>
[nazev_en] => Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion
[popis_en] => This paper deals with the experimental performance evaluation of the prototype of a novel inertial energy harvester based on Tusi couple mechanism. The harvester was developed as an autonomous power source for environments with very low frequency and magnitude of mechanical vibrations available. The experiments were conducted using human body during different activities as a source of mechanical excitation, with the prospect of using the harvester for powering up future wearable electronic devices. Four different locations on a single measurement specimen were picked for the harvester placement-back of the head, belt, wrist and ankle. Measurements in each location comprised of walking on a straight and level path at natural speed, walking up and down the stairs, jumping, running, and location-specific activities that were expected to provide significant output power. The measured average output power of the device with dimensions 50x50x20 mm on empirically selected 2 kΩ electrical load reached up to 6.5 mW, obtained with the device attached to the ankle while shaking the leg.
[klicova_slova_en] => Energy harvesting
[vysledek_datum] => 2018-10-10T00:00:00+02:00
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[pagelen] => 15
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[quotations] => HADAŠ, Z.; SMILEK, J.; RUBEŠ, O.
[title] => Energy harvesting from passing train as source of energy for autonomous trackside objects
[typ] => PV
[year] => 2018
[id_vav] => 150499
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[1] => Array
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[quotations] => MACHŮ, Z.; MAJER, Z.; ŠEVEČEK, O.; ŠTEGNEROVÁ, K.; HADAŠ, Z.
[title] => Electro-mechanical analysis of a multilayer piezoelectric cantilever energy harvester upon harmonic vibrations
[typ] => PV
[year] => 2018
[id_vav] => 150691
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[2] => Array
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[quotations] => SLÁVIK, O.; HUTAŘ, P.; BERER, M.; GOSCH, A.; ARBEITER, F.; PINTER, G.; NÁHLÍK, L.
[title] => Numerical Modelling of Cylindrical Specimen under Mixed-Mode Loading Conditions
[typ] => PV
[year] => 2018
[id_vav] => 151145
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[3] => Array
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[quotations] => PODUŠKA, J.; HUTAŘ, P.; FRANK, A.; KUČERA, J.; SADÍLEK, J.; PINTER, G.; NÁHLÍK, L.
[title] => Numerical simulations of cracked round bar test: Effect of residual stresses and crack asymmetry
[typ] => PV
[year] => 2018
[id_vav] => 151149
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[4] => Array
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[quotations] => HUTAŘ, P.; POKORNÝ, P.; PODUŠKA, J.; FAJKOŠ, R.; NÁHLÍK, L.
[title] => Effect of residual stresses on the fatigue lifetime of railway axle
[typ] => PV
[year] => 2017
[id_vav] => 151177
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[quotations] => MARCIÁN, P.; THOMKOVÁ, B.; FLORIAN, Z.; BORÁK, L.
[title] => Biomechanical Study of Bone – Dental Implant Interactions Using Patient-Specific Approach and Multiscale Computational Modeling
[typ] => PV
[year] => 2018
[id_vav] => 151285
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[quotations] =>
[title] => 3rd International Conference on Design, Mechanical and Material Engineering (D2ME 2018)
[typ] => EV
[year] => 2018
[id_vav] => 151477
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[quotations] => BANSOD, Y.; JAKKA, V.; BURŠA, J.
[title] => Bendo-tensegrity model simulates compression test of animal cell
[typ] => PV
[year] => 2018
[id_vav] => 151655
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[quotations] => KŠICA, F.; HADAŠ, Z.; HLINKA, J.
[title] => Application of piezoelectric sensors for structural health monitoring in aerospace
[typ] => PV
[year] => 2018
[id_vav] => 151656
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[quotations] =>
[title] => The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV)
[typ] => EV
[year] => 2018
[id_vav] => 151682
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[10] => Array
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[quotations] => RUBEŠ, O.; BRABLC, M.; HADAŠ, Z.
[title] => Verified nonlinear model of piezoelectric energy harvester
[typ] => PV
[year] => 2018
[id_vav] => 151683
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[11] => Array
(
[quotations] => KŠICA, F.; HADAŠ, Z.
[title] => Prediction of position-dependent stability lobes based on reduced virtual model
[typ] => PV
[year] => 2018
[id_vav] => 151685
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[12] => Array
(
[quotations] => SMILEK, J.; HADAŠ, Z.
[title] => Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion
[typ] => PV
[year] => 2018
[id_vav] => 151686
)
)
)