Lidé na fakultě
Ing. Jan Vyčichl, Ph.D.

2023

In the scope of the Motostudent 2023/24 competition there was created complex project of the whole motorcycle in the category of Electro bikes. Report contains conceptual design, detailed design, prototyping and development.

Oponovaná technická zpráva cizojazyčně

2022

Technical report describing tech details of the motorcycle EVO 2.0 Electric for the competition Moto Engineering Italy in 2022 according to the regulations of Motorsport Engineering Society.

Technická zpráva cizojazyčně

2020

In the scope of the Motostudent competition there was created complex project of the whole motorcycle in the category of Electro bikes. Report contains conceptual design, detailed design, prototyping and development.

Technická zpráva cizojazyčně

2020

In the research report we focus on the state of the art of the propossed innovation, moreover there is declared the research process, proof of concept, market viability and discussion of the proposed innovation of variable geometry of the racing motorcycle. In the repoert there are as well mentioned results of the topological and structural optimizations of the whole assembly as well as mannufacturing drawings.

Výzkumná zpráva cizojazyčně

2016, ISBN 978-80-01-06016-2

Sborník z mezinár. konf. cizojazyčně

2015, ISBN 978-80-01-05791-9

Sborník z mezinárodní konf. v češtině

2013, 20th Anniversary of the Faculty of Transportation Sciences, Czech Technical University in Prague - Selected Papers, Praha, České vysoké učení technické v Praze, Fakulta dopravní), p. 298-309), ISBN 978-80-01-05320-1

The work deals with the simulation of the motorcycle helmet drop test with the numerical software LS-Dyna. The aim of study was to obtain acceleration values of the headform gravity center. The factors of head injuries HIC were determined from the acceleration values. The model of motorcycle helmets was created by using of a 3D handheld scanner. An impact pad was created and the headform model was modified. The draft for the model was represented by a real motorcycle helmet. Properties of materials used for making the actual helmet were assigned to the motorcycle helmet model. The quality of helmets is assessed in terms of damping properties at the drop test. Damping properties were assessed on the basis of the acceleration values of the head gravity center. A drop test was also performed on the pads rotated in different directions. The problems of motorcycle helmets testing in Europe is adjusted by the ECE 22-05 standard. The standard primarily determines how to make drop tests.

Stať ve sborníku z fakultní konference cizojazyčně

2013, 21th SVSFEM ANSYS Users' Group Meeting and Conference 2013, Brno, SVS FEM), p. 183-190), ISBN 978-80-905525-0-0

This work is focused on the elastic fastening rail to the sleeper, the definitions of used types, their usage in the Czech republic, main advantages and disadvantages, the comparison of the most popular systems on the SZDC site and the summary of the requirements for the fastening. The practical part of the work is focused on the creation on a model in the ANSYS Workbench software. There are four simulations of the load, which correspond with the real situations. The results from each situation have been analyzated (the equivalent stress, the total deformation) and have been compared among themselves. The other parts of the rail truck were analysed too.

Stať ve sborníku z mezinár. konf. cizojazyčně

2013, 21th SVSFEM ANSYS Users' Group Meeting and Conference 2013, Brno, SVS FEM), p. 133-141), ISBN 978-80-905525-0-0

The aim of this work was to develop a numerical model of motorcycle helmet simulating the impact of motorcycle helmet to the planar surce at different angles. A 3D handheld scanner was created to obtain the geometrical model of motorcycle helmet. The MKP model was created from the geometric model in ANSYS ICEM CFD. Material properties to this model were assigned in the LS-PrePost. Simulation of drop test was realised in LS-DYNA solver. The problems of motorcycle helmets testing in Europe is adjusted by the ECE 22-05 standard. The standard primarily determines how to make drop tests.

Stať ve sborníku z mezinár. konf. cizojazyčně

2013, 21th SVSFEM ANSYS Users' Group Meeting and Conference 2013, Brno, SVS FEM), p. 191-198), ISBN 978-80-905525-0-0

The main aim of this study is to obtain a new virtual model of a bicycle helmet, using reverse engineering. The real bicycle helmet was transferred to the virtual model using 3D scanning equipment. The virtual surface model was subsequently modified in several software products, which supports application of reverse engineering. Using multiple editing software aims to determine the most appropriate option obtaining accurate computer models for the future. The resulting model will be applied to optimize the drop test in LS-DYNA. The numerical calculation will be compared with the measured data obtained from the real tests.

Stať ve sborníku z mezinár. konf. česky

2012, Engineering Mechanics 2012, Prague, Institute of Theoretical and Applied Mechanics, AS CR), p. 192-193), ISBN 978-80-86246-39-0

The study focused on helmet drop tests conducted in numerical software LS-DYNA. For this purpose new virtual models of the test-head according to ČSN EN 960 (2007) and impact pad were created. A modified model of a bicycle helmet, utilized in earlier studies and obtained from 3D scan of a real bicycle helmet, was also used. The models had similar properties as a real drop test has. The aim was to find out the output value of the model head acceleration during impact and determination of Head Injury Criterion.

Stať ve sborníku z mezinár. konf. cizojazyčně

2012, 20th SVSFEM ANSYS Users' Group Meeting and Conference 2012, Brno, SVS FEM), p. 1-7), ISBN 978-80-260-2722-5

The protective function of a bicycle helmet is tested under ČSN EN 960 in a so-called drop test. The study is focused on helmet drop tests conducted in numerical software LS DYNA. According to this standard ČSN EN 960 - virtual model of the head and impact pad was created. The model of the bicycle helmet utilized from earlier studies and obtained from 3D scan of the real helmet was also used. The model has similar properties as a real drop test model. The quality of helmet's damping properties is derived from the values of acceleration measured in the centre of gravity of a dummy head. With the help of the LS DYNA program the quality of damping properties of three types of helmet design was compared. The effect of helmet's displacement from the ideal position on dummy head was also examined. The aim was to find the output value of the model of head acceleration during the drop test and evaluation of Head Injury Criterion. This project was done within the framework of the institutional research plan, identification code MSM6840770043.

Stať ve sborníku z mezinár. konf. cizojazyčně

2012, 20th SVSFEM ANSYS Users' Group Meeting and Conference 2012, Brno, SVS FEM), p. 1-8), ISBN 978-80-260-2722-5

The aim of this project is a numerical stress analysis of fractured human thighbone with internal osteosynthesis. We simulated incidents, when a pacient's broken leg was too early however fully treated and his thighbone did not begin to recovery yet. In these extreme incidents the whole stresses are carried by the plates. For the detachedness of this project we compared analyses combinations of the two types osteosynthesis plates models applied to two different thighbone diaphysis fractures models. The modeling and calculations was done using FEM software ANSYS Workbench. This project was done within the framework of the institutional research plan, identification code MSM6840770043.

Stať ve sborníku z mezinár. konf. cizojazyčně

2010, Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 224 (4), p. 259-267), ISSN 0954-4097

This article deals with finite-element (FE) modelling of the reinforcing effect of the geosynthetic material used in the construction of a ballasted track. Various different designs of geosynthetic material are studied and their reinforcing effects are evaluated in terms of the total settlement reduction. Three-dimensional FE models of the reinforced railway superstructure are compared to a reference FE model with no reinforcement. Each geosynthetic material is modelled respecting its material properties, and the interaction with the ballast material is simulated according to its primary function.

Článek v periodiku excerpovaném SCI Expanded

2009, Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing, Stirling, Civil-Comp Press Ltd), p. 69-69), ISBN 978-1-905088-30-0, ISSN 1759-3433

Paper deals with numerical and experimental investigation of ballasted track under cyclic loading. The experimental part deals with measurement of settlements of different track bed designs under repetitive load. The designs are tested in laboratory conditions in a small-scale box filled with ballast material reinforced with different type of geosynthetics. Different thickness of the ballast and subballast layers are tested and results in terms of measured settlements at different locations are compared with FE models.

Abstrakt ve sborníku z mezinár. konf.

2009, Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing, Stirling, Civil-Comp Press Ltd), ISBN 978-1-905088-31-7, ISSN 1759-3433

This paper deals with numerical and experimental investigation of ballasted track under cyclic loading. The experimental part deals with measurement of settlements of different track bed designs under repetitive load. The designs are tested in laboratory conditions in a small-scale box filled with ballast material reinforced with different type of geosynthetics. Different thickness of the ballast and subballast layers are tested and results in terms of measured settlements at different locations are compared with FE models.

Stať ve sborníku z mezinár. konf.

2008, The Present and Future of Modern Transport, Praha, Czech Technical University in Prague), p. 333-336), ISBN 978-80-01-04056-0

The article deals with problem of interaction between pelvic bone and cemented acetabular component in light of contact stress distribution in subchondral bone. To solving this problem was creating two EF models. First models is inaccurate implanted in pelvic bone and this model is compared with model with ideal position of acetabular component in the pelvic bone.

Stať ve sborníku z mezinár. konf. cizojazyčně

2008, Proceedings of Workshop 2008, Praha, Czech Technical University in Prague), p. 430-431), ISBN 978-80-01-04016-4

The article deals with creating and analysis of interaction between pelvic bone and cemented acetabular component with imperfection in cement layer. Boundary conditions and loads were defined on contact FE models. Results from contact FE analysis of the model with ideal position of acetabular component were compared whit results from two models with imperfection in cemented layer.

Stať ve sborníku Workshop ČVUT

2008, ANSYS konference 2008, Brno, SVS FEM), p. 52-55), ISBN 978-80-254-3355-3

Článek se věnuje problematice importu STL modelu do modulu Design Modeler softwaru ANSYS Workbench . Popisuje jednu z možných cest jak importovat STL model do uvedeného modeláře s využitím několika dostupných aplikací. Proces je demonstrován na modelu pánevní kosti.

Stať ve sborníku z lokální konf. česky

2008, ISBN 978-80-01-04056-0

Sborník z mezinár. konf. cizojazyčně

2008, Proceedings of the Sixth International Conference on Engineering Computational Technology, Stirling, Civil-Comp Press Ltd), p. 160-160), ISBN 978-1-905088-26-3

The paper deals with numerical analysis of hip joint surgery that effects changes of stress field in acetabulum area. Pelvic bone geometry was obtained from computer tomography by automatic generation. Material properties of trabecular bone were obtained from experiments by the optical identification method. The numerical analysis compares shapes and peak values of stress field in the acetabulum area and the cement layer. Ultimate values of first principal stress, third principal stress and total displacements were used as reference magnitudes.

Stať ve sborníku z mezinár. konf.

2007

Sborník z mezinár. konf.

2007, From Horse-drawn Railway to High-speed Transportation Systems, Praha, Czech Technical University in Prague), p. 143-146), ISBN 978-80-01-03699-0

The paper deals with numerical analysis of hip joint surgery effect to changes of acetabulum stress field and implant migration in acetabulum area. Pelvic bone geometry was obtained from computer tomography by semi-automatic generation. There are two main input parameters for the stress analysis. CE angle detailing the shape of acetabulum. Direction of loading substitute the femoral replacement. The numerical analysis compare shapes and peak values of stress field in acetabulum area. Ultimate values of first principal stress, third principal stress and total displacements were used as reference magnitudes. This ultimate values predict probable migration process. Numerical analysis results correspond well with after surgery clinical reports.

Stať ve sborníku z mezinár. konf. cizojazyčně

2007, Engineering Mechanics 2007, Praha, Ústav termomechaniky AV ČR), p. 321-322), ISBN 978-80-87012-06-2

The article deals with contact stress analysis of pelvic bone after implantation of cemented acetabular component with imperfections of cemented layer. 3D high resolution FE model of pelvic bone was created from the sequence of CT-slices. Boolean operations were used for inserting the spherical cemented component. Cemented component was eccentrically inserted into the pelvic bone and that created imperfection as non-uniform cement layer. Two contacts were defined in the FE model. The first contact is defined between the cement layer and the pelvic bone and the second one is between the cement layer and the polyethylene cup. The model was loaded by quasi-static joint forces, representing the maximum value of stance phase of gait [Bergmann et al., 2001]. The FE model was used to ascertain the contact stress conditions in the underlying subchondral bone.

Stať ve sborníku z mezinár. konf. cizojazyčně

2007, Engineering Mechanics 2007, Praha, Ústav termomechaniky AV ČR), p. 151-152), ISBN 978-80-87012-06-2

In general all orthopaedic operations may cause the change of muscle balance. This dysbalance various not only range of movement but also the loading vector during the movement. In case of hemiarthroplasty when the new joint is created by femoral replacement and intact acetabulum could be the dysbalance very dangerous. Migration of the implant head after hemiarthoplasty is the problem which observed to nearly at all patients. Muscle dysbalance and shape of acetabulum are the two main problems solved by numerical analysis of hip joint FE model.

Stať ve sborníku z mezinár. konf. cizojazyčně

2007, 15th ANSYS Users´Meeting, Brno, SVS FEM), p. 1-6), ISBN 978-80-254-0301-3

Příspěvek se zabývá přípravou numerického modelu cyklistické ochranné přilby pro výpočet v programu ANSYS. Přilba byla snímána ručním skenerem. Po vyhodnocení snímků povrchu helmy jsou k dispozici grafické výstupní soubory ve formátu IGES a STL. Pro načtení a vytvoření numerického geometrického modelu v ANSYS byla provedena úprava modelu dvěma postupy. Za prvé je to úprava vstupního souboru z formátu IGES a vytvoření modelu a za druhé je to vytvoření plochy povrchu přilby z trojúhelníků vepsané do plochy modelu ve formátu STL.

Stať ve sborníku z lokální konf. česky

2006, 2st Students' Scientific Conference of Biomechanics, Wroclaw, Oficyna Wydawnica Politechniki Wroclawskiej), p. 73-74), ISSN 1732-0240

The article deals with creating high resolution FE model of pelvic bone and acetabular component (cemented and cementless). The contact between component and pelvic bone was created and the model was loaded by quasi-static joint forces, representing the individual stance phase of gait. The FE model was used to ascertain the contact stress conditions in the underlying subchondral bone.

Stať ve sborníku z mezinár. konf.

2006, Fourth International IASTED Conference on BIOMECHANICS, Gran Meliá Salinas, Lanzarote, IASTED), p. 11-14), ISBN 0-88986-604-X

The paper deals with contact stress analysis of pelvic bone after implantation of cemented acetabular component with imperfections of cemented layer. 3D high resolution FE model of pelvic bone was created from the sequence of Computer Tomography (CT) slices. The magnitude and character of the contact stress distribution in subchondral bone depends on the type of imperfections in cement layer. Several openings are often drilled into the bone to improve the fixation of the cemented acetabular cup into the pelvic bone. Boolean operations were used for inserting the spherical cemented acetabular implant. Two contacts were defined in the FE model. The first contact is defined between the cement layer and the pelvic bone and the second one is between the cement layer and the polyethylene cup. The model was loaded by quasistatic joint forces, representing the maximum value of stance phase of gait.

Stať ve sborníku z mezinár. konf.

2006, Engineering Mechnaics 2006, Praha, Academy of Sciences of the Czech Republic), p. 347-348), ISBN 80-85918-93-5

The article deals with contact stress analysis of pelvic bone after implantation of cemented acetabular component with imperfections of cemented layer. 3D high resolution FE model of pelvic bone was created from the sequence of CT-slices. Imperfections were created both in the cement layer and in the bone tissue by drilling fixation holes. Boolean operations were used for inserting the spherical cemented component. Two contacts were defined in the FE model. The first contact is defined between the cement layer and the pelvic bone and the second one is between the cement layer and the polyethylene cup. The model was loaded by quasi-static joint forces, representing the maximum value of stance phase of gait \cite{Bergmann-HIP98}. The FE model was used to ascertain the contact stress conditions in the underlying subchondral bone.

Stať ve sborníku z mezinár. konf. cizojazyčně

2005, 13. ANSYS User´s Meeting, Brno, SVS FEM), p. 321-329), ISBN 80-239-5675-2

Článek se zaměřuje na problematiku vlivu různých typů acetabulárních komponent na velikost a charakter kontaktního napětí v pánevní kosti. Popisuje tvorbu geometrického a následně i MKP modelu pánevní kosti s implantovanou acetabulární komponentou, jejich vzájemnou interakci a způsob upevnění a zatížení tohoto modelu s využitím softwaru ANSYS. V závěru tohoto článku jsou výsledky kontaktní analýzy zhodnoceny a porovnány.

Stať ve sborníku z lokální konf. česky

2005, Engineering Mechanics 2005, Praha, Ústav termomechaniky AV ČR), p. 347-348), ISBN 80-85918-93-5

Práce se zabývá porovnáním vlivu geometrie různých typů acetabulárních komponent na charakter kontaktního napětí v pánevní kosti při normální chůzi. Pro tento účel byl vytvořen ze sekvence 240 CT snímků detailní MKP model pánevní kosti a tři MKP modely acetabulárních komponent. Ty odpovídají v současnosti nejužívannějším typům implantátů používaných při totální endoprotéze kyčelního kloubu.

Stať ve sborníku z lokální konf. česky