Acta Polytechnica. 2012, vol. 52: Poslední příspěvky
Zobrazují se záznamy 21-40 z 100
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A Study of Parameters Setting of the STADZT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with the new time-frequency Short-Time Approximated Discrete Zolotarev Transform (STADZT), which is based on symmetrical Zolotarev polynomials. Due to the special properties of these polynomials, STADZT ... -
Research Trends for PID Controllers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper analyses the most significant issues that have been recently been addressed by researchers in the field of Proportional-Integral-Derivative (PID) controllers. In particular, the most recent techniques proposed ... -
Femoral Test Bed for Impedance Controlled Surgical Instrumentation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The risk for patients during the standard procedure of revision of cemented artificial hip joints is unsatisfactorily highdue to its high level of invasiveness and limited access to the operative field. To reduce this risk ... -
A Comparison of Power Quality Controllers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper focuses on certain types of FACTS (Flexibile AC Transmission System) controllers, which can be used for improving the power quality at the point of connection with the power network. It focuses on types of ... -
Model of Customer Buying Behavior in the CZ Mobile Telecommunication Market
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The Czech mobile telecommunication market constitutes an oligopoly of three operators, who have built a privileged position and effectively crush any competition. The entry of a new operator has been considered by the ... -
Energy Estimation of Distributed Phase-shift Beamforming
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Ad-hoc and sensor networks are composed of small, low-power devices, which can connect between themselves without the help of an infrastructure. Research in this area has been both extensive and intensive and is still very ... -
Simulation of a Matrix Converter Fed Drive With Sliding Mode Control
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Induction machines are among the most widely used electrical-to-mechanical converters in electric drives. Their advantageous robustness and simplicity goes hand-in-hand with complicated control. A converter with a suitable ... -
Development of an Ultralight with a Ducted Fan
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper introduces the UL-39 project, an ultralight aircraft with a ducted fan, and some of the problems that have arisen in the course of its development. Several problems with the design of a non-traditional aircraft ... -
Design Process of Energy Effective Shredding Machines for Biomass Treatment
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The shredding process has not been sufficiently investigated for the design of better, energy and material saving shredding machines. In connection with present-day concern about the environment, ecology, energy saving, ... -
Hygiena 3, a Forgotten Project for Electrolytic Water Treatment
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)In the interwar period, the city of Prague had to resolve the problem of treating the polluted water produced by its citizens. From 1933 - 1936 an ambitious competition was held. The idea behind the competition was to bring ... -
Simulation of Free Airfoil Vibrations in Incompressible Viscous Flow — Comparison of FEM and FVM
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with a numerical solution of the interaction of two-dimensional (2-D) incompressible viscous flow and a vibrating profile NACA 0012 with large amplitudes. The laminar flow is described by the Navier-Stokes ... -
Synthesis of Mechanisms by Methods of Nonlinear Dynamics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with a new method for parametric kinematic synthesis of mechanisms. The traditional synthesis procedure based on collocation, correction and optimization suffers from the local minima of objective functions, ... -
Massive Parallelization of Multibody System Simulation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with the decrease in CPU time necessary for simulating multibody systems by massive parallelization. The direct dynamics of multibody systems has to be solved by a system of linear algebraic equations. ... -
Hygro-Thermo-Mechanical Analysis of a Reactor Vessel
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities ... -
A Numerical Study of Wind Flow Over a Coal Storage Shelter
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper presents some of the main numerical results obtained while simulating the wind flow over a shelter covering a coal storage. The aim of this numerical study was to evaluate the change in flow patterns caused by ... -
Transonic Flow of Wet Steam — Numerical Simulation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The paper presents a numerical simulation of the transonic flow of steam with a non-equilibrium phase change. The flow of steam is approximated by a mixture model complemented by transport equations for moments. Proper ... -
OOFEM — an Object-oriented Simulation Tool for Advanced Modeling of Materials and Structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The aim of this paper is to describe the object-oriented design of the finite element based simulation code. The overall, object-oriented structure is described, and the role of the fundamental classes is discussed. The ... -
Global Optima for Size Optimization Benchmarks by Branch and Bound Principles
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper searches for global optima for size optimization benchmarks utilizing a method based on branch and bound principles. The goal is to demonstrate the process for finding these global optima on the basis of two ... -
The Asymptotic Properties of Turbulent Solutions to the Navier-Stokes Equations
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)In this paper we study the large time behavior of solutions to the Navier-Stokes equations. We present a brief survey of results concerning energy decay, and discuss a related phenomenon of the large time energy concentration ... -
A Thermogravimetric Study of the Behaviour of Biomass Blends During Combustion
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The ignition and combustion behavior of biomass and biomass blends under typical heating conditions were investigated. Thermogravimetric analyses were performed on stalk and woody biomass, alone and blended with various ...