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Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 20 z 314
Turjanicová, Jana , Rohan, Eduard
Numerical simulation of quasi-static model of ionic transport through deformable porous media

The paper deals with the computational model of quasi-static transport of 2-component electrolyte solution transport trough deformable porous medium respecting material microstructure. The multiscale approach is used to derive effective tensors describing macroscopic homogenized body. Numerical simulatio...

Špička, Jan , Hajžman, Michal , Bielak, Ondrej , Masák, Jan
Sensitivity analysis of the crack evaluation for steam turbine casings loaded by pressure and temperatures

The operation of steam turbines is related to the extreme conditions such as high pressure and temperature, which can lead to fatigue issues and subsequent undesirable problems. This paper is focused on the methodology for the fracture analysis of turbine casings. The evaluation me...

Smolík, Luboš
Post-processing techniques for response of non-linear systems

Challenges in modern engineering require implementation of more and more complex computational models. The computational models are often non-linear and even a slight modification of a design parameter can cause qualitative changes in a predicted response. Several visualisation methods which impr...

Rendl, Jan , Zilli, Leonardo , Sedláček, František
Investigation of driving properties for formula Student

This paper deals with the investigation of driving properties such as rolling resistance of the chassis during the cornering and the effect of anti-roll bars on this phenomenon. This variable has a significant influence on the change of loading forces at tire contact patches, ...

Polach, Pavel , Hajžman, Michal , Bulín, Radek
Selected problems solved in Pilsen using multibody dynamics

The paper informs on some problems solved during approximately past twenty years in Pilsen using multibody simulations. Naturally, the list of activities is not comprehensive, it concerns activities of the authors in Výzkumný a zkušební ústav Plzeň s.r.o. and in the Department of M...

Pecka, Aleš , Bublík, Ondřej , Vimmr, Jan
FlowPro: multipurpose CFD software written in Java

FlowPro is a multipurpose open-source CFD software, which is being developed by the researchers of the Department of Mechanics of the Faculty of Applied Sciences at the University ofWest Bohemia. FlowPro is designed to solve various non-linear systems of hyperbolic-parabolic partial differen...

Krejčová, Milada , Holeček, Miroslav , Chełminiak, Przemysław
The measurement of single myosin head in Fokker-Planck framework and information gain

Muscles on a molecular level are created by actin and myosin filaments. In this scale, it is necessary to take into an account thermal fluctuations – describe in terms of Brownian motion. Due to the motion, it is impossible to predict exact position of a single myosi...

Kocáb, Jiří , Kottner, Radek , Heczko, Jan , Krystek, Jan
Shear and torsion tests of viscoelastic materials

The main scope of the paper are shear and torsion tests of cork-composite Amorim ACM87. The material is a particle composite with viscoelastic properties. In order to investigate the behaviour of viscoelastic materials, performance of specific mechanical experiments is important. Some materi...

Hajžman, Michal
Dynamics of rotating systems with rolling element bearings

This paper deals with a suitable approach to the computational modelling of rolling element bearings in the framework of rotating systems dynamics. Various alternative approaches are briefly summarized and a chosen moderately complex approach is described in more detail. The presented bearin...

Byrtus, Miroslav
Basic properties of a bistable mechanical oscillator

The contribution deals with analysis of dynamical properties of 1 DOF bistable mechanical oscillators. These systems appear in many technical applications which advantageously use their both static and dynamic properties. First, a mechanical mode based on von Mises truss is introduced and&#x...

Bulín, Radek
Dynamic analysis on nonlinear flexible multibody systems using newmark integration scheme

A mathematical description of multibody mechanical systems containing flexible bodies often leads to a nonlinear set of differential–algebraic equations of motion which can be solved using various numerical integration schemes. In this paper, the possibilities of the commonly known Newmark integr...

Brašnová, Jaroslava , Lukeš, Vladimír , Rohan, Eduard
Identification of multi-compartment darcy flow model material parameters

This papper deals with modelling of blood perfusion in the liver tissue and focuses on the identification of the model parameters. For a description of perfusion a multi-compartment Darcy model is used. This model describes a hierarchical flow in the tree structure of the live...

Hynčík, Luděk , Bońkowski, Tomasz , Vychytil, Jan
Virtual hybrid human body model for PTW safety assessment

Road traffic accidents cause one of the highest numbers of severe injuries. The numbers of deaths and seriously injured citizens prove that traffic accidents and their consequences are still a serious problem to be solved. Virtual human body models play an important role...

Bońkowski, Tomasz , Šoltés, Lukáš , Hynčík, Luděk , Kottner, Radek , Kochová, Petra
Leather for motorcyclist garments: Multi-test based material model fitting in terms of Ogden parameters

This paper is focused on experimental testing and modeling of genuine leather used for a motorcycle personal protective equipment. Simulations of powered two wheelers (PTW) accidents are usually performed using human body models (HBM) for the injury assessment equipped only with ...

Lašová, Zuzana , Zemčík, Robert
Determination of group velocity of propagation of Lamb waves in aluminium plate using piezoelectric transducers

A prior knowledge of group velocities of Lamb wave modes is a key for analysis of time signals in guidedwave based structural health monitoring. The identification of multiple wave modes may be complicated due to dependency of group velocity on frequency (dispersion). These&...

Drábek, Pavel , Robinson, Stephen
Konvergence ke stacionárním řešením bistabilní rovnice s nehladkým reakčním členem, které mají vyšší energii

In this paper, we investigate the local stability of critical points with energy that is higher than the ground-state energy of the functional associated with the bistable equation. We assume that a double-well potential lacks C^2 regularity at the global minimizers. Previous work ...

Bizzarri, Michal , Lávička, Miroslav
Rational adaptive blends among obstacles in 3D by contour method

In this paper we will continue in investigating ‘contour method’ and its using for the computation of rational parameterizations of canal surfaces without a need of sum of squares (SOS) decomposition. Further approaches for constructing flexible smooth transitions between canal surfaces will...

Agudelo Rico, Oscar Iván , Drábek, Pavel
Anizotropní semipozitonové kvazilinaární úlohy

We present the existence of positive solutions for a degenerate (or singular) quasilinear equation in a ball or in the entire space. As differential operator we consider a weighted p-Laplacian with a continuous cofficient satisfying a mild integrability condition towards the boundary of...

Bobkov, Vladimír , Drábek, Pavel
Některé překvapivé vlastnosti radiálních a symetrických vlastních čísel a funkcí p-laplaciánu na kruhu

We discuss several properties of eigenvalues and eigenfunctions of the p-Laplacian on a ball subject to zero Dirichlet boundary conditions. Among main results, in two dimensions, we show the existence of nonradial eigenfunctions which correspond to the radial eigenvalues.

Bizzarri, Michal , Lávička, Miroslav , Kosinka, Jiří
Skinning and blending with rational envelope surfaces

We continue the study of rational envelope (RE) surfaces. Although these surfaces are parametrized with the help of square roots, when considering an RE patch as the medial surface transform in 4D of a spatial domain it yields a rational parametrization of the domain’s boundar...

Záznamy kolekce (řazeno podle Datum zaslání v sestupně pořadí): 1 až 20 z 314