Computational mechanics 2018 Collection home page

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Collection's Items (Sorted by Submit Date in Descending order): 21 to 40 of 73
Škoda, J. , Šklíba, J.
Self-oscillation of the two-axis gyroscopic stabilizer

Van der Pol introduced a solution of the self-oscillations of spring suspended body siting upon the uniform velocity moving rough conveyor belt in 1934. Friction between body and conveyor belt was non-Coulomb, which characteristics has negative slope in the certain interval - see F...

Šístek, J. , Kůs, P.
Combining adaptive mesh refinement with a parallel multilevel BDDC solver

Adaptive mesh refinement and domain decomposition. Adaptive mesh refinement is an important part of solving problems with complicated solutions or when a prescribed accuracy needs to be achieved. In this approach, solution is found on a given mesh and its local error is estimated.&...

Šika, Z. , Svoboda, F. , Volech, J. , Krejza, R. , Hromčík, M. , Zavřel, J.
Control of vibration suppression of plate with a grid of actuators and sensors

The paper deals with the optimization of active vibration suppression of plate demonstrator equipped by regular grid of 5x5 actuators and their collocated 5x5 sensors realized by planar piezo patches. Robust H-infinity design with fixed order controller of predefined structure and LQR d...

Schuster, M.
Elementary approach to monitoring and evaluation of aerodynamics simulations of moving parts in computational domain

This paper is generally focused on modelling of aerodynamics with motion in computational domain. Basic approach to modelling of domain zones motion using so called �sliding-mesh� method and setting relevant boundary conditions for simulate calculations are described. These engineering cases were...

Šedlbauer, D.
Optimized Wang Cubes for reconstruction of heterogeneous materials

The term (re)construction of either 2D or 3D random heterogeneous material models used to be linked with the traditional concept of the Periodic Unit Cell (PUC). Unfortunately principles of the PUC approach with periodic boundary conditions are in direct conflict with definitions of...

Sánchez-Alvarado, A. , Sánchez-Brenes, O. , Sánchez-Brenes, M. , Zerpa- Catanho, M. , Vargas-Del Valle, C. , Céspedes-Calderón, G.
Intra- and inter-somatotype differences in a manual material handling task

The Manual Material Handling (MMH) of loads is considered worldwide one of the main components in musculoskeletal disorders in various industries, which also carries a high cost. Prior research has shown that there are limited studies comparing different bodily characteristics for both ...

Rohan, E. , Nguyen, V.-H. , Lukeš, V. , Cimrman, R. , Naili, S.
On approaches, methods and problems related to wave dispersion in porous media

The paper is devoted to modelling of wave propagation in fluid saturated porous media. The aim is to compare two approaches suitable for wave analysis in periodic structures. The homogenization-based method provides macroscopic models and relies on scale separation, such that the wave&#...

Radová, J. , Machalová, J.
Optimal control method for solution of inverse problem

In this contribution we deal with using of the optimal control method for solution of an inverse problem for nonlinear Gao beam which was published by Gao. The inverse problem will be formulated as the minimization of a cost functional which depends on a state problem.&#x...

Radolf, V. , Horáček, J. , Bula, V. , Košina, J. , Švec, J.
Experimental simulation of unilateral paralysis of human vocal folds

Unilateral paralysis of the superior laryngeal nerve affecting the cricothyroid muscle produces an imbalance in the longitudinal tension of the vocal folds during phonation. Such an asymmetry causes changes in the vibratory pattern of the vocal folds and in the resulting voice quality,&...

Půst, L. , Pešek, L. , Šnábl, P.
Damping of flutter oscillations by dry friction contacts

Self-excited flutter vibrations of turbine blades are very dangerous phenomena for the service life of turbines. The various design treatments are therefore applied for suppression of blades� flutter vibrations. The introduction of dry friction elements is one of the very effective methods.&...

Pecka, A. , Bublík, O. , Vimmr, J.
Flutter boundary assessment for a blade cascade using developed discontinuous Galerkin code

This contribution builds on the last year contribution, where the flutter boundary was assessed for a single aerofoil with the aid of the fluid-structure interaction (FSI) code developed for the purpose of aeroelastic flutter analysis as a part of FlowPro. FlowPro is a multipurpose...

Pavlata, P.
Computer simulation of the frontal collision of the articulated urban bus into the column of the traffic board portal

There are currently many active and passive systems designed to protect passengers in modern vehicles. These systems are now developed purely on the basis of virtual approaches. The first aim of this paper is to demonstrate the process of computer reconstruction of the urban a...

Padovec, Z. , Kropík, B. , Zavřelová, T.
Design and analysis of shaft and bonded joints for electric car gearbox

Main goal of this work is to analyze loading of current steel input shaft of electric car gearbox and then design lightweight alternative version. Designed shaft will have hybrid construction from composite and steel parts. Gears will be bonded to the shaft, so it is nece...

Oplt, T. , Hutař, P. , Šebík, M.
Numerical modelling of plasticity induced crack closure

Plasticity induced crack closure was numerically estimated on two-dimensional FE models. Different methods of determinations were compared and discussed. Optimal FE model configuration was defined, particularly in connection with experimental results. This could be a first step for full three dim...

Novák, M. , Vackář, J. , Cimrman, R.
Sensitivity analysis of total energy in electronic structure calculations

In the contribution, several approaches to evaluating this term will be analyzed in terms of convergence properties and computing demands using test calculations on simple molecules of nitric oxide, carbon dioxide and tetrafluormethane, see Fig. 1, with interatomic distances scaled by a ...

Nováček, V. , Havelková, L.
Urogynecologic surgical mesh and associated complications: Can computational biomechanics help?

Pelvic organ prolapse is a pelvic floor disorder occurring when the tissue and muscles of the pelvic floor no longer support the pelvic organs resulting in the drop from their normal position. The pelvic organs include the vagina, uterus, bladder, urethra, and rectum. The blad...

Náprstek, J. , Fischer, C.
Lagrange and Appell-Gibbs approaches in problems of non-holonomic dynamic systems

Hamiltonian functional and relevant Lagrange equation system are popular tools in investigation of dynamic systems. Various generalizations enable to extend the class of problems concerned slightly beyond conventional limits of a Hamiltonian system. This strategy is very effective particularly concern...

Náhlík, L. , Pokorný, P. , Vojtek, T. , Hutař, P.
Influence of humidity of environment on fatigue crack propagation in railway axle

The presentation is devoted to the crack propagation in the railway axle made of EA4T steel. The propagating fatigue crack is subjected to the different kinds of crack closure. The paper describes contribution of plasticity induced crack closure, roughness induced crack closure and ...

Naď, M. , Kolíková, L. , Ďuriš, R. , Šimon, Š.
Elimination of edge-chipping phenomenon during rotary ultrasonic drilling

Advanced materials such as ceramics, composites and other materials with superior properties are increasingly used in industries such as aerospace, automotive, electronics but they are also used in medical applications. Mechanical properties of such materials are characterized by specific properties&#...

Musil, J.
Numerical simulation of free-surface flow over a weir with non-reflective outlet boundary conditions

The non-reflective boundary conditions are essential ingredient in the procedure of computational domain restriction where presence of artificial/open boundaries requires prescription of appropriate boundary conditions in order to obtain numerical solution equivalent to the original one. Thus, these b...

Collection's Items (Sorted by Submit Date in Descending order): 21 to 40 of 73