Single phase current-source active rectifier for traction: control system design and practical problems

This research has been motivated by industrial demand for single phase current-source active rectifier dedicated for reconstruction of older types of dc machine locomotives. This paper presents converters control structure design and simulations. The proposed converter control is based on the mathematical model and due to possible interaction with railway signaling and required low switching frequency employs synchronous PWM. The simulation results are verified by experimental tests performed on designed laboratory prototype of power of 7kVA

Trends in production and using of the steel ropes

The Steel ropes are an important structural and transport element in various industries.There are possible various trends in their production and usage from the technical progress point of view. There also are production improvements and materials for the steel rope properties, the development of machinery for the production of steel ropes and their elements as well as the development of new steel rope structures and the improvement parameters of present steel rope structures. This paper deals with questions of materials, used for the steel rope production and the steel rope characteristics for various structures with the reference to their parameters and possibilities of their usage

Telemetric expert system based on interent

The paper deals with the proposal of the measuring chain assigned for remote measuring in the automobile industry. The designed solution should be able to do automatic measurement of all required parameters and to send obtained data to the remote centre, where they could be analyzed by telemetric expert system

Universal access system based on microcontroller

This article deals with proposal of universal access system which would utilize the standard input-output ports ofmicrocontroller. The whole proposal is based upon the ATmega64 processor, which makes the access system universal and very flexible. The main problem of this proposal is the USB communication decoding and creation of custom USB driver for TouchaTag reader.This article deals with proposal of universal access system which would utilize the standard input-output ports ofmicrocontroller. The whole proposal is based upon the ATmega64 processor, which makes the access system universal and very flexible. The main problem of this proposal is the USB communication decoding and creation of custom USB driver for TouchaTag reader

Selection and allocation of a warehouse linked to reloading terminal and seaport

Combined transport provides great possibilities for material reloading in terminals or warehouses. However, this cannot be done without a tailored warehouse, geographically suitable for all stakeholders, technically adequate for the handled material, providing the required service while keeping the transport costs at minimum. Allocation design and warehouse erection, connecting the warehouse with the reloading terminal - the seaport, provides an ever-increasing number of options and solutions in the form of integrated freight trains and regular container trains linking seaports with reloading terminals, which significantly saves transport costs and allows for more route and transport type combinations. The paper presents how a suitable warehouse is selected and how its allocation is decided on to cater to transport of the material through the reloading terminal and the seaport. Warehouse allocation was proposed using the Cooper iteration method. The given warehouse location will ensure the optimal cost of shipping and deliveries to individual customers.Web of Science65417316

Straovací služby v slovenské železniční dopravě

Účelom tejto práce je podať ucelený prehľad o slovenskej železničnej doprave a v nej poskytovaných službách. Prvá kapitola poskytuje úvod do problematiky spoločného stravovania. Druhá kapitola je zameraná na dopravnú infraštruktúru na Slovensku a postavenie železničnej dopravy v nej. Tretia kapitola je venovaná súčasným európskym trendom v oblasti služieb vyššej kvality v železničnej doprave. Záverečná kapitola obsahuje analýzu služieb niektorých poskytovateľov služieb vyššej kvality pôsobiacich v slovenskej železničnej doprave a tiež podáva porovnanie dvoch najvýznamnejších.Účelem této práce je podat ucelený přehled o české železniční dopravě a v ní poskytovaných službách. První kapitola poskytuje úvod do problematiky společného stravování. Druhá kapitola je zaměřena na dopravní infrastrukturu na Slovensku a postavení železniční dopravy v ní. Třetí kapitola je věnována současným evropským trendům v oblasti služeb vyšší kvality v železniční dopravě. Závěrečná kapitola obsahuje analýzu služeb některých poskytovatelů služeb vyšší kvality působících v české železniční dopravě a také podává srovnání dvou nejvýznamnějších.The purpose of this thesis is to provide a comprehensive view on the services provided in slovak rail transport. The first chapter provides an introduction to food and beverage industry. The second chapter focuses on transport infrastructure in Slovakia and the position of rail transport in it. The third chapter looks into current trends in high quality services in European rail transport. The final chapter includes an analysis of service providers operating in Slovak railways and also gives a comparison of the two most important

Catering services in slovak rail transport

The purpose of this thesis is to provide a comprehensive view on the services provided in slovak rail transport. The first chapter provides an introduction to food and beverage industry. The second chapter focuses on transport infrastructure in Slovakia and the position of rail transport in it. The third chapter looks into current trends in high quality services in European rail transport. The final chapter includes an analysis of service providers operating in Slovak railways and also gives a comparison of the two most important

Design and Evaluation of a Magnetoelastic Tensile Force Sensor

This paper introduces the basic theory behind magnetoelastic sensors which are based on the change of magnetic properties (permeability) due to mechanical stress (Villari effect). A well-known magnetoelastic sensor, the Pressductor, is described. A simulation model of a sensor is created, described, and evaluated by computing the static transfer characteristic of RMS secondary coil voltage change due to tensile stress. A real sensor is then manufactured from a polycrystalline transformer sheet and experimentally tested by using a tensile load created by water weight. The simulation and experiment show similar behavior but are not completely identical which is most likely since some material properties were taken from literature rather than from experimental measurements, like the magnetostriction coefficient and initial magnetic susceptibility