Acta Polytechnica CTU Proceedings. 2022 ( vol. 32-39): Poslední příspěvky
Zobrazují se záznamy 241-260 z 290
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Sulphate corrosion of cement pastes with a high content of waste marble powder
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The article focuses on sulphate corrosion of cement pastes with a high content of waste micronized marble powder. Micronized marble powder is used as a substitute for Portland cement CEM I 42.5R. The amount of micronized ... -
Phase-field damage of laminated glass in explicit dynamics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Laminated glass is aesthetic but also functional modern material, which has spread from the automotive industry to the civil engineering in the form of design as well as structural elements. Proper design of this material ... -
Mesh generation and mechanical tests of basic element cells of porous structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Advanced porous structures are novel, emerging materials with a broad range of applicability but a rather difficult means of design and manufacturing. The advent and availability of the additive manufacturing industry in ... -
Generation of mesostructure for lattice discrete particle model
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A preliminary study of two approaches for the internal structure generation utilized in the lattice discrete particle models (LDPM) [1] is presented. The presented methods used for particle generation and placement are ... -
Detection of the presence of microorganisms during production of plasterboard
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The article introduces possibility how to use special material from plasterboard back to the production of plasterboards. The recycled material was prepared from standard plasterboards KNAUF WHITE (it means plasterboard ... -
Flood risk assessment for road infrastructures using Bayesian networks: case study of Santarem - Portugal
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Assessing flood risks on road infrastructures is critical for the definition of mitigation strategies and adaptation processes. Some efforts have been made to conduct a regional flood risk assessment to support the ... -
Kalker’s coefficient c11 and its influence on the damping and the retuning of a mechanical drive torsion system of a railway vehicle
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Within the research of electromagnetically excited torsion oscillations in the mechanical part of traction drive systems of modern railway vehicles, which has been realized at the Faculty of mechanical engineering at the ... -
Comprehensive verification of the behavior of the continuous welded rail on the bridge
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The aim of this paper is to verify the real behavior of the continuous welded rail on the bridge with a longer expansion length than allowed by Czech national regulations. Special attention is focused on the rate of ... -
Estimating running safety factor of ballastless railway bridges using tail modelling
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Excessive vertical acceleration of ballastless railway bridges subjected to vibrations induced by passing trains is one of the governing design criteria for bridges in high-speed lines. However, to the authors’ knowledge, ... -
Accident rate of regional railway vehicles at railway crossings for the years 2014 to 2018
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)From a societal point of view, there are growing demands to increase traffic safety and reduce the risk of accidents of rail and road vehicles. The research to increase the safety of railway vehicles, which is carried out ... -
The long-pitch corrugation development in small radii curves
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper deals with the phenomenon of long-pitch corrugation in curves of the small radii and also the effects that accelerate or slow down its development. The paper presents data from sections of railway track measured ... -
The Railway 4.0 Concept – the vision of a digital railway in the Czech Republic (CR)
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper presents a new alternative approach to the modernization of control and safety technologies on the railway network in the Czech Republic, referred to as the "The Railway 4.0 Concept". The presented concept is ... -
Modern railways for the 21st century – a challenge not only for designers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper outlines the basic goals for modern rail transport in the Czech Republic. This contribution points out some challenges and technical tasks that project engineers and operators of the rail transport in the Czech ... -
Comparison of selected parameters for evaluation of rail surface damage intensity
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper deals with the issue of evaluation of a rail surface damage (RSD) intensity. Some ways of calculating parameters that represent the RSD are described. In this context, a multi-body model of a railway vehicle was ... -
Comparison of FETI-based domain decomposition methods for topology optimization problems
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We critically assess the performance of several variants of dual and dual-primal domain decomposition strategies in problems with fixed subdomain partitioning and high heterogeneity in stiffness coefficients typically ... -
Environmental perspectives of fine grounded concrete powder: LCA case study of light-weight concrete block
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The construction elements produced with low demand for primary resources are being developed in the building industry. However, not only consumption of primary resources but also environmental impacts of such products ... -
The effect of sampling volume size on the apparent stiffness of jointed rock mass
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Overall mechanical properties of a jointed rock mass are strongly affected by discontinuities – fractures – that naturally occur in rocks. Stochastically-generated discrete fracture network (DFN) modeling, which uses a ... -
Determination of water absorption coefficient of unfired earth materials different in used clay and ratio of components
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper is focused on unfired rammed earth and its water absorption properties. Increasing the utilization of raw natural materials can be one of the approaches towards sustainable development. Different prescriptions ... -
Microstructure reconstruction via artificial neural networks: a combination of causal and non-causal approach
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We investigate the applicability of artificial neural networks (ANNs) in reconstructing a sample image of a sponge-like microstructure. We propose to reconstruct the image by predicting the phase of the current pixel based ... -
Benchmark VERCORS 2022: mechanical response of the prestressed concrete containment wall to ambient conditions
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The VERCORS benchmark was developed to provide a solid experimental basis for numerical modeling of concrete containment buildings (CCBs) to extend their lifespan. The goal of the first phase of the third benchmark is to ...