|
| |
|
|
Analysis of dynamic effects acting on crossings
Vukušičová, Daniela ; Vukušič, Ivan (referee) ; Smutný, Jaroslav (advisor)
This thesis is focused on measurement and analysis of dynamic effects on railway turnouts. Two turnouts with different wear condition were chosen. My attention was focused mainly on the crossing part of the turnout, where the highest dynamic impacts occur. The point of the thesis is comparison of the crossing part of turnouts in term of dynamic behaviour and assessment of influence of the wearing depth on dynamic effects. A part of the thesis is proposal of methodology of the measurement and convenient mathematical apparatus for analysing of dynamic effects on crossings.
|
|
|
Evaluation of under sleeper pads influence in the test section in Planá nad Lužnicí railway station
Švanda, Tomáš ; Langer, Vojtěch (referee) ; Hruzíková, Miroslava (advisor)
Under sleeper pads (USP) are elastic layers positioned on the bottom surface of sleepers. Their aim is to slow down a deterioration of track geometrical parameters and reduce track maintenance costs. Three test sections with under sleeper pads have been built on the railway network in the Czech Republic. The effect of the under sleeper pads is continuously monitored. The height level of rails is measured by precise levelling. This thesis is focused on the Planá nad Lužnicí test section. It describes the precise levelling measurement in the 2015 and its evaluation and comparing with previous measurements. Furthermore track recording car measurements were evaluated.
|
|
|
Development of Long-pitch Corrugation in Curves of Small Radii
Valehrach, Jan ; Kohout,, Martin (referee) ; Lidmila,, Martin (referee) ; Plášek, Otto (advisor)
Throughout the operation, the rails are worn and deteriorate. With the increasing speed of rolling stock, along with higher track loads and especially in the vicinity of major traffic hubs with a higher frequency of trains, defects that did not occur to such an extent before or were not considered to be significant, are brought to the forefront of the concerns of track infrastructure managers. Even though these defects are not directly restrictive to traffic operation, they are, in any case, a source of noise and vibration. One of these defects on the railway track is the micro-geometry defect of the running surface of the railhead. In directional curves with radii of less than 600 m or 700 m, defects known as long-pitch corrugation occur on the inner rail. In curves with 300 m or smaller radii, these waves are so distinct that they are a significant source of noise and vibration. In particular, vibrations affect the track surroundings and the track itself, as they cause other defects in the track structure. This dissertation deals with long-pitch corrugation, focusing on the monitoring of wave generation and development over time. The verification of the possibility to track the development of slip waves over time is the basis for possible future models predicting the development of defects. Numerous measurements of geometric parameters of the track and microgeometry of the railheads, specifically slip waves, have been carried out in the framework of the problem. Using RMS and peak-to-peak methods, the rate of development of defects over time and the relationship with other track parameters were evaluated. Based on the obtained development curves, intervals for further maintenance interventions were estimated. A part of the thesis focuses on the deficiency or excess of cant concerning the development of long-pitch corrugation.
|
|
|
Evaluation of the Trial Section for Under Sleeper Pads
Murínová, Klára ; Langer, Vojtěch (referee) ; Plášek, Otto (advisor)
Under sleeper pads (USP) are elastic pads on underneath surface of the sleeper. Their main advantage is reducing of stress in track bed, slowing down a deterioration of track quality, life extension of railway track and reducing life cycle cost. There are three trial track sections in the Czech Republic in which are USP used. The influence of the USP is continuously monitored. The bachelor thesis is focused on the Ústí nad Orlicí trial track section. This thesis describes measurements of the track level by the precise levelling method and measurements of the stress in track bed carried out in the 2016 and 2017 and their evaluation and comparison with previous measurements in the 2015.
|
|
|
Belt conveyor for transport of aggregates
Smola, Jiří ; Malášek, Jiří (referee) ; Pokorný, Přemysl (advisor)
The aim of this bachelor thesis is to design belt conveyor for aggregates on distance 40 m and on vertical distance 8 m. This thesis contain short description individual parts of belt conveyor, functional calculation and determination of main dimensions carried out according to ISO 5048. This thesis contain drawing of set and drawing of steel construction
|
|
|
Analysis of dynamic effects acting on the turnout constructions
Hajniš, Jan ; Vukušič, Ivan (referee) ; Smutný, Jaroslav (advisor)
Author´s name: Jan Hajniš School: Technical University - VUT, Brno Faculty of Civil Engineering Veveří 331/95, 602 00 Brno Program: Construction and Transportation Engineering Title: Analysis of dynamic effects acting on the turnout constructions Consultant: Prof. Ing. Jaroslav Smutný, Ph.D. Number of pages: about 70 + attachments Number of attachments: about 40 Year: 2012 This work describes the size and the process of dynamic effect – vibrations and shift – cockles in crossing panel and switch panels of the turnout constructions on steel and concrete sleepers in time and frequency domain. It compares the results of the measurement between these turnout constructions. Dynamic effects are undesirable physical phenomena for operation each train. It is therefore necessary to eliminate these phenomena as much as possible. The result of this test will by means of software programm and measuring set help to determine precisely the advantages and disadvantages of using both turnout constructions, or even to propose their improvements or dimensions.
|
|
|
MEASUREMENT OF DYNAMIC PARAMETERS OF TRACK GRID
Podolník, Adam ; Tomandl, Vladimír (referee) ; Smutný, Jaroslav (advisor)
Coupled with theory analyses, various static and dynamic tests carrying out in laboratory or directly on site serve as a basis for selection and comparison of particular rail superstructure parts. It should be noted that the theoretical analysis of the application of mathematical modeling is often based on highly idealized assumptions. The purpose of this bachelor thesis is the experimental analysis of dynamic effects of selected flexible fastening structures without baseplates. Forces induced by the passage of trains have been simulated on a specially prepared samples using inertial exciter. Additional measurements of the dynamic response of structures to shock induced by a modal hammer were also performed. Measurements were performed in the laboratory of ÚPKO and ÚŽKS and in situ.
|
|
|
The analysis of dynamic effects acting on the turnout with a focus on structural condition
Hajniš, Jan ; Vukušič, Ivan (referee) ; Smutný, Jaroslav (advisor)
Author´s name: Bc. Jan Hajniš School: Technical University - VUT, Brno Faculty of Civil Engineering Veveří 331/95, 602 00 Brno Program: Construction and Transportation Engineering Title: The Analysis of dynamic effects acting on the turnout with a focus on structural condition Consultant: Prof. Ing. Jaroslav Smutný, Ph.D. Number of pages: about 100 + attachments Number of attachments: about 340 Year: 2014 This work describes the size and the process of dynamic effect – vibrations and shift – cockles in crossing panel and switch panels of the turnout constructions on steel and concrete sleepers in time and frequency domain. It compares the results of the measurement between these turnout constructions. Dynamic effects are undesirable physical phenomena for operation each train. It is therefore necessary to eliminate these phenomena as much as possible. The result of this test will by means of software programm and measuring set help to determine precisely the advantages and disadvantages of using both turnout constructions, or even to propose their improvements or dimensions.
|
|
|
Assessment of Geometry Parameters of Track with Under Sleeper Pads
Škovranová, Michaela ; Volejník, Miloslav (referee) ; Hruzíková, Miroslava (advisor)
The diploma thesis applies to under sleeper pads. It researches thein using and benefits in foreign railvway authorities. Further it assesses track geometrical parameters in the trial track section with under sleeper pads in track Havlíčkův Brod - Okrouhlice and in the railway station Planá nad Lužnicí. There were evaluated measurements of vertical alingnment rails by precise leveling and deviations of track geometrical parameters measured by track meusuring car in the diploma thesis.There is expressed an conclusion about the impact of under sleeper pads on track geometric data in the thesis.
|
guest ::
