Acta Polytechnica CTU Proceedings. 2021 ( vol. 29-31)
Kolekce v této komunitě
Poslední příspěvky
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Possibilities of high-speed railway turnout data description
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper aims to summarize possibilities how to create data models of high-speed railway turnouts. The turnouts designed for high-speed operation require specific geometric solution. As the UIC RailTopoModel is considered ... -
ON COMPARISON OF 3D ISOGEOMETRIC TIMOSHENKO AND BERNOULLI BEAM FORMULATIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Application of isogeometric analysis (IGA) for curved beams is very convenient for its ability of exact representation of curved geometries. Several beam formulation has been presented since the introduction of IGA. In ... -
Maintaining the competitiveness of the czech railway industry
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The development of foreign trade plays an important role in the Czech economy. The important foreign trade commodity item is Machinery and transport equipment (SITC 7). Railway vehicles is a part of this category, other ... -
Calculation of the minimal length of the high-speed line
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper explores the minimum length of continuous sections of the high-speed line. The minimum length is examined in terms of the maximum speed of high-speed vehicles. Both traditional trainsets consisting of traction ... -
Energy saving in rail transport
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Aim of this article is to introduce and present advantages and possibilities of using simulation tools to calculate energy flows of tractive vehicle in all phases of its ride. The focus is on the braking phase, especially ... -
APPLICATION OF THE MORI-TANAKA METHOD TO DESCRIBE THE RATE-DEPENDENT BEHAVIOR OF UNIDIRECTIONAL FIBROUS COMPOSITES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper examines the possibility of using the Mori-Tanaka micromechanical model describe the rate dependent behavior of the polymer matrix based fibrous composites. The generalized Leonov model is adopted to capture the ... -
High-speed rail network and periodic timetable: a comparative analysis of operational concepts
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper compares chosen European high-speed railway (HS) networks in terms of their offer of HS passenger service. The criteria chosen for comparison are network topology, degree of service periodicity and degree of ... -
Research tools aplicable in designing of high-speed and high-power rail vehicles
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The importance of the railway transport of both goods and passengers continuously grows as it is in many points of view more ecological and economical solution in comparison with road transport. Just the importance has ... -
BEAM ELEMENT UNDER FINITE ROTATIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The present work focuses on the 2-D formulation of a nonlinear beam model for slender structures that can exhibit large rotations of the cross sections while remaining in the small-strain regime. Bernoulli-Euler hypothesis ... -
THE OLDEST UNDERGROUND RAILWAYS IN THE WORLD AND THEIR ANNIVERSARIES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The five oldest underground railways started to be operational in the 19th century. These were the metros in London, Athens, Istanbul, Budapest and Glasgow. Undoubtedly, world primacy of status in terms of age belongs to ... -
LOCALIZATION ANALYSIS OF DAMAGE FOR ONE-DIMENSIONAL PERIDYNAMIC MODEL
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Peridynamics is a recently developed extension of continuum mechanics, which replaces the traditional concept of stress by force interactions between material points at a finite distance. The peridynamic continuum is thus ... -
MECHANICAL AND CHEMICAL ACTIVATION OF BLAST FURNACE SLAG AND ITS INFLUENCE ON THE MECHANICAL PROPERTIES OF THE RESULTING CEMENT PASTE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The usage of waste materials is a very important global topic. The large amount of waste everywhere in the world needs to be processed or disposed. Landfilling is not an option anymore, because of European legislation and ... -
EVALUATION OF IMPACT OF ELEVATED TEMPERATURES ON YOUNG’S MODULUS OF GLT BEAMS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The influence of elevated temperatures on mechanical behavior of glued laminated timber beams is examined on the basis of tensile tests. Dog bone samples prepared from beams exposed to fire of variable duration were ... -
MODELING TIME-DEPENDENT DEFORMATIONS OF CONCRETE MEMBERS SUBJECTED TO SYMMETRIC AND ASYMMETRIC DRYING
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The time-dependent behavior of concrete members with uniform cross-section subjected to symmetric drying can be predicted with one of many models anchored in the design codes. Since these models use the cross-sectional ... -
COMPARING THE HOEK-BROWN AND MOHR-COULOMB FAILURE CRITERIA IN FEM ANALYSIS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This paper revisits the issue of a potential substitutions of the Hoek-Brown failure model by the standard Mohr-Coulomb model in the stability analysis of rock masses. The derivation of equivalent shear strength parameters ... -
SIMULATION OF T-JOINTS BETWEEN RHS STEEL MEMBERS WITH OFFSET IN ABAQUS CAE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The current paper focuses on numerical simulation peculiarities of offset welded rectangular hollow section joints. Understanding the modelling techniques can result in easier and faster and above all correct outcomes from ... -
FRACTURE ENERGY OF ILLITIC RAMMED EARTH WITH HIGH WATER-CLAY RATIO
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)The article is focused on design of mixture of rammed earth, producing, testing and determination of fracture energy of unfired rammed earth and its stress-strain curve in tensile bending test. Three different mixtures of ... -
INFLUENCE OF EARTH COMPOSITION ON ADSORPTION CAPACITY OF METHYLENE BLUE DYE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Final properties of unfired earth are influenced by composition of earth mixtures. Methylene blue test could be useful method for analysis of earth composition. This would facilitate of designing unfired earth building ... -
NUMERICAL SIMULATION OF SLUMP FLOW TEST OF CEMENT PASTE COMPOSITES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)This study presents a numerical simulation of the mini-slump flow test performed on the Haegerman table, according to EN 1015-3. The two-dimensional axisymmetrical Volume of fluid (VOF) model is used for the calculation. ... -
AUTOMATED BIM ENTITY RECONSTRUCTION FROM UNSTRUCTURED 3D POINTCLOUDS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)Laser scanning is used widely in architecture and construction to document existing buildings by providing accurate data for creating a 3D model. The output is a set of data points in space, so-called point cloud. While ...
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