electromagnetic properties railway ballast research in philippines
Rail research at the University of Pretoria, and railway research Rail research at the University of Pretoria by Prof Hannes Gräbe radar (GPR) A GPR antenna transmits a short electromagnetic pulse of radio frequency through the track structure and measures the dielectric constant, the magnetic susceptibility and the electrical conductivity of the medium under considerationAssessment of Railway Track Substructure Condition using ,, Abstract Ground penetrating radar (GPR) has been employed to assess railway track substructure (ballast, subballast, and subgrade) conditions GPR involves transmitting radar pulses into the substructure and measuring return signals that have reflected off boundaries between substructure layers with different electromagnetic propertiGeophysical Research Abstracts Vol 18, EGU2016, This study aims at proposing a model capable to assess the physical conditions of railway ballast, in terms of percentage of fouling within the material, by analyzing its electromagnetic response For the calibration of such a model, a laboratory set-up was implemented in order to reproduce a real-scale railway environmentThe application of time domain ground penetrating radar to ,, Dec 01, 1999· Ground penetrating radar (GPR) is an electromagnetic (EM) sounding technique that has been developed to aid the investigation of shallow sub-surface objects/characteristics which have contrasting electrical properties , The application of GPR as a NDT technique within the railway industry is still essentially in its infancy in comparison with other GPR applicationsEffects of natural abrasion on railroad ballast strength ,, Jun 30, 2020· 1 Introduction Railway ballast is primarily responsible for draining water away from the track However, it also plays very important roles in resisting loading forces, reducing stress on the subgrade by distributing load, maintaining track geometry, and providing large voids for the storage and movement of fouling material , Fouling is the introduction of finer particles less than 3/8 inch ,.
Automatic Classiﬁcation of Ground, are from 50% clay ballast, clean ballast, and 50% coal ballast, respectively (a) Time-domain waveforms (b) Frequency magnitude spectra delivers it to the transmitting antenna T x, which radiates an electromagnetic wave Once the electromagnetic wave hits an object whose electrical properties are different from those ofStrengthening of the railway ballast section shoulder with ,, Jun 01, 2017· Research carried out in (Indraratna et al, 2013) is devoted to the study of the properties of a railway track reinforced with geosynthetic materials Teixeira et al (2009) studied the improvement of properties of the high-speed ballast tracks using a bituminous sub-ballast layer[PDF] ASSESSMENT OF RAILWAY TRACK SUBSTRUCTURE ,, Ground penetrating radar (GPR) has been employed to assess railway track substructure (ballast, subballast, and subgrade) conditions GPR involves transmitting radar pulses into the substructure and measuring return signals that have reflected off boundaries between substructure layers with different electromagnetic properti The principle electromagnetic property of the layers is the ,Overview and outlook on railway track stiffness ,, May 05, 2016· Stiffness is one of the basic performance parameters for railway track The efficient and accurate stiffness measurement has been considered as the foundation for further development of railway engineering, and therefore has great theoretical and practical significance Based on a summary of the connotation and measurement of track stiffness, the state of the art of measurement methods ,S Brillante's research works | Università degli Studi di ,, S Brillante's 8 research works with 96 citations and 1,200 reads, including: Railway-track transmission-line parameters from finite-element field modelling: Shunt admittance.
Applied Sciences | Special Issue : Monitoring and ,, In a high-speed railway environment, the electromagnetic interference (EMI) has been a major threat to RSTT, and may result in critical security issues for railway transportation and even passengers Given the complex scenario of the high-speed railway, it is significant to monitor the impact of disturbances in order to guarantee the quality of ,[tel, Subsequently, the electromagnetic modelling of a railway system is introduced, deal- ing with both propagation and radiation phenomena; in particular, the main topic here addressed is the modelling of supply-lines, through a quasi-TEM approachResearch on influence of impulse force on vertical ,, The paper presents extended abstract on preliminary research on influence of impulse force on vertical vibration of the rail Research method was the impulse method for measuring the vibration response at specific points of track It presents the waveforms of the vibration for the different distance from sensor to impulse point and distribution of the maximum and RMS valuApplication of ground, Railway track substructure maintenance management is the process of utilizing railroad resources to maintain and upgrade the track substructure The process begins with a measure of the track condition to evaluate the substructure performance, determine locations along the track that require maintenance, and identify appropriate solutions Ground penetrating radar (GPR) has been proposed as a ,The Application of Ground, Furthermore, it is discussed a new simulation-based methodology for the detection of the fouling content in railway ballast Concerning the mechanical parameters, experimental based methods are presented for the assessment of the strength and deformation properties of the soils and the top-bounded layers of flexible pavements.
Railway Track Stiffness, Speeds, Proceedings of 7th World Congress on Railway Research, Montreal, 5-7 June, 2006 E Berggren E: Measurements of Track Stiffness and Track Irregularities to Detect Short Waved Support Conditions, Proceedings of International Conference on Railway Track Foundations, Birmingham, 11-13 September, 2006 ISBN: 0-704426-00-5Automatic Classification of Ground ,, portation, railway plays an important role in daily life A railway structure typically consists of steel rails, fastening system, sleepers, ballast, subballast and subgrade  The transverse section of a railway is given in Fig 1 The ballast is an essential component for proper railway functioning[PDF] A simulation, In this work a numerical model capable to predict the electromagnetic response of railway ballast aggregates under different physical conditions has been calibrated and validated by a simulation-based approach The ballast model is based on the main physical and geometrical properties of its constituent material and it is generated by means of a random-sequential absorption (RSA) approachRailroad Ballast Evaluation Using Ground, The early detection of ballast fouling is of utmost importance to the safety of the rail system and its life-cycle cost-effectiveness Ground-penetrating radar (GPR), a nondestructive evaluation tool, has shown its potential as a means of assessing the condition of the railroad ,University of Wollongong Research Online, used for classiﬁcation of railway ballast The experimental results show that the proposed approach can represent the GPR signals efﬁciently, and effective features can be extracted for pa ttern classiﬁcation I I NTRODUCTION Ground penetrating radar exploits electromagnetic ﬁelds t o image the subsurface areas Buried objects such as.
University of Wollongong Research Online, The Wollongong railway data set was collected in our project for railway ballast assessment  The aim of the project was to develop an automatic and non-destructive method using GPR for evaluating the conditions of railway ballast The GPR surveys were conducted along an existing railway track in Wollongong, New South Wales, AustraliaSubsurface Evaluation of Railway Track Using Ground ,, This report details the implementation of 2 GHz horn antennas for measuring working ballast thickness using ground penetrating radar and the initial implementation of a 500 MHz horn antenna used for subballast and subgrade characterization The work was performed as part of the first task order and modification task 1 in the fourth phase of a multi-phase ground penetrating radar research and ,Non, A continuous increase in the worldwide demand for high-speed traffic, freight tonnage as well as of the train operating frequency is worsening the decay conditions of many railway infrastructur This occurrence affects economy-related business as well as contributing to rising maintenance costs It is known that a failure of a railway track may result in tremendous economic losses, legal ,Frequency Response of Transmission Lines with Unevenly ,, The main motivation arises from the research for railway track circuit systems where transmission line models are often employed However, in contrast to real transmission , with electromagnetic ﬁelds  , For instance, humidity in both soil and ballast bed can impact those properties as indicated by  In addition, some sudden ,Electromagnetic Characterisation of a Victorian Railway ,, 11 Background to the Research Investment in rail infrastructure has become a grow- , effective characterisation of brownfield site soil properties, using electromagnetic techniques, may suffer ,.
Assessment of Railway Track Substructure Condition Using ,, ASSESSMENT OF RAILWAY TRACK SUBSTRUCTURE CONDITION USING GROUND PENETRATING RADAR by James P Hyslip1 Stanley S Smith2 Gary R Olhoeft3 Ernest T Selig1 1 Ernest T Selig, Inc, Hadley, MA 2 Geo ,MR Clark's research works | The University of Edinburgh ,, MR Clark's 7 research works with 474 citations and 5,341 reads, including: Application of infrared thermography to the non-destructive testing of concrete and masonry bridges4 Low, Recently, model-based approaches to ballast damage detec-tion have been proposed by Lam et al (2012, 2014), where the rail-sleeper-ballast system was modeled as Timoshenko beam on an elastic foundation and changes in the ballast stiffness were monitored through a model update procedure In (Lam et al, 2012) a feasibility study was performed us-Model Track Studies by Ground Penetrating Radar (GPR) on ,, properties of the ballast such as density, water content, grain size distribution (GSD), and fouling percentage Keyword: ballast, model track test, ground penetrating radar, water