Dissertations / Theses on the topic 'Railroad track'
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Fesharaki, Mohammad. "3-D Dynamic Analysis of High-Speed Railroad Track." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3366.
Full textWehbi, Mohamed. "Developing a novel technique to extract track stiffness information from track geometry measurement." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6722/.
Full textRomps, John F. (John Francis). "Modelling track maintenance and its effects on the reliability of a single track railroad line." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12397.
Full textMan, Amnon Pieter de. "Dynatrack a survey of dynamic railway track properties and their quality /." Delft, the Netherlands : Delft University Press, 2002. http://books.google.com/books?id=UydSAAAAMAAJ.
Full textKhadem, Sameni M. "Railway track capacity : measuring and managing." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348816/.
Full textStith, Jason C. "RAILROAD TRACK PRESSURE MEASUREMENTS AT THE RAIL/TIE INTERFACE USING TEKSCAN SENSORS." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/213.
Full textDaheshpour, Kasra. "Network level decision support system to assess railway track maintenance needs." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8164/.
Full textLe, Pen Louis. "Track behaviour : the importance of the sleeper to ballast interface." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/73284/.
Full textGong, Cencen. "The interaction between railway vehicle dynamics and track lateral alignment." Thesis, University of Huddersfield, 2013. http://eprints.hud.ac.uk/id/eprint/19755/.
Full textJain, Ashish. "Discrete Element Modeling of Railway Ballast for Studying Railroad Tamping Operation." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/91438.
Full textMS
Frohling, Robert Desmond. "Deterioration of railway track due to dynamic vehicle loading and spatially varying track stiffness." Thesis, Pretoria : [s.n.], 1997. http://upetd.up.ac.za/thesis/available/etd-01122009-160350.
Full textD'Angelo, Giacomo. "Bitumen stabilised ballast : a novel track-bed solution towards a more sustainable railway." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/55089/.
Full textChen, Cheng. "Discrete element modelling of geogrid-reinforced railway ballast and track transition zones." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13399/.
Full textLawton, Alan. "The dynamic interaction between a magnetically levitated vehicle and a flexible track." Thesis, University of Nottingham, 1988. http://eprints.nottingham.ac.uk/11527/.
Full textKramp, Kenneth P. "The Analysis and Creation of Track Irregularities Using TRAKVU." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36861.
Full textMaster of Science
Safari, Baghsorkhi Mohammad. "Experimental investigation of the effect of the ballast/sleeper interventions on railway track performance." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39277/.
Full textMohammad, Fouad Abbas. "Analysis and design of the LR55 track system." Thesis, Liverpool John Moores University, 1998. http://researchonline.ljmu.ac.uk/4952/.
Full textTusing, Donald S. "Modular track panels for improved safety in the mining transportation industry." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=2853.
Full textTitle from document title page. Document formatted into pages; contains xiv, 158 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 141).
Ahmad, Nazirah. "A methodology for developing high damping materials with application to noise reduction of railway track." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/66183/.
Full textMcHenry, Michael T. "PRESSURE MEASUREMENT AT THE BALLAST-TIE INTERFACE OF RAILROAD TRACK USING MATRIX BASED TACTILE SURFACE SENSORS." UKnowledge, 2013. http://uknowledge.uky.edu/ce_etds/15.
Full textSu, Bei. "EFFECTS OF RAILROAD TRACK STRUCTURAL COMPONENTS AND SUBGRADE ON DAMPING AND DISSIPATION OF TRAIN INDUCED VIBRATION." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_diss/312.
Full textSchwarz, Brandon A. (Brandon Alexander). "Evaluation of a methodology for detecting railroad track geometry anomalies and determining rail vehicle fatigue loads." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12401.
Full textRowshandel, Hamed. "The development of an autonomous robotic inspection system to detect and characterise rolling contact fatigue cracks in railway track." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4821/.
Full textRibeiro, Fernando Sgavioli. "Contribuição para análise do custo do ciclo de vida de um sistema de gerência de pavimento ferroviário." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-15012018-134934/.
Full textA new approach to the railroad track management system is presented in this thesis. The main objective of the research was the development of a network management system and life cycle cost analysis in a project level, adopting as a case study of the Estrada de Ferro Vitoria Minas. The bibliographic review has exposed geometric and structural track quality evaluation models in Brazil and in the world. The development began with the composition of the network management system using an inventory of the track under study, the subdivision of the railway into homogeneous segments of variable lengths depending on the geometry (curve and tangent), and the application of six codes: (i) class, (ii) pavement structure inventory based on tie type, (iii) geometry with definition of quality assessment methodology proposing an index that applies the exception counting and the standard deviation of the parameters - cross level, warp, alignment and gauge - and safety, alarm and intervention limits, (iv) surface by analysis of rail wear and rail surface defects, (v) safety by friction coefficient, and (vi) structural capacity with the application of the track modulus parameterized by the track geometry car. From the six codes, it was possible to categorize the applicable maintenance strategy at a project level, create prediction equations of the ballast and the rail wear degradation and simulate life cycle cost of the strategies. In order to verify the technical feasibility of the mentioned maintenance strategy, it was measured the stress at the top of the ballast and subgrade and the track modulus by retroanalysis deflections in two sections of the EFVM.
Verlinde, Karel Jef Stefaan. "Finite element analysis of tubular track system." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71741.
Full textENGLISH ABSTRACT: The Tubular Track (TT) railway system is a twin beam modular railway system consisting of two reinforced concrete (RC) beams on which steel rails are continuously supported. The beams are linked with galvanised steel gauge tie bars and continuously supported by soil foundations, and can be used to replace conventional sleeper and ballast railway support. The TT railway system has in the past been analysed with various analysis methods, but were found to obtain con icting results. The con icting results means that one of the analysis methods used for the analysis and design of TT railway sections is either an underestimation or overestimation of section displacements, forces, and stresses; or both methods could even be incorrect. The main emphasis of this investigation is therefore to develop and verify static and dynamic analysis methods and modeling techniques which can be used to simulate the TT railway system accurately. The results and models of the previous analyses are not explicitly investigated in this dissertation, but serve as a motivation for this investigation. The TT system is supported by several soil strata providing vertical support, but geometrically modeling the subgrade strata in the analysis models adds a high level of complexity, and is not feasible for general analysis where soil conditions are mostly unknown. The elastic foundation theory is therefore used to accurately simulate the interaction between beam and foundation and therefore su ciently simpli es the analysis models. Simpli cation of a subgrade foundation by simulating a soil sti ness supporting the TT beam is investigated and analysed by comparing nite element analysis (FEA) results of various soil models using parameters of four known soil formations currently in use at TT railway sections. The FEA of the subgrade formations indicates that there is a linear relationship between the modulus of subgrade reaction for a square plate bearing test and a rectangular, in nitely long plate representing the subgrade support for the TT beams. A square plate bearing test can therefore be performed on site and modi ed to represent the actual subgrade support sti ness of the TT railway structure, whereafter it can be used for the analysis and design of the TT system using one of the proposed analysis methods. The analysis models used range from simple theoretical models based on elastic foundation principles, to two-dimensional (2D) beam elements, and ultimately to complex three-dimensional (3D) solid nite element models. The models used for the analyses are the Single and Double Beam elastic foundation, PROKON 2D beams, ABAQUS 2D beams and ABAQUS 3D solid element models. The alternative analysis methods considered should provide a clear indication of which analysis methods are accurate and feasible for design of the TT system. An in-situ reference model with known de ections and design parameters speci c to a TT railway section is used to analyse the di erent analysis methods' accuracy and validity. The Double Beam, ABAQUS 2D and ABAQUS 3D models were found to provide very similar displacements, bending moments and shear forces for a static analysis, whereas the PROKON and Single Beam models provide unsatisfactory results. The PROKON beam model underestimates the bending moments and shear forces in the rail, and overestimates bending moments and shear forces in the RC beam by a considerably margin. This result can lead to the underdesigning of the rail which could possibly force the RC beam to be subjected to larger maximum bending moments and shear forces than for what it was originally designed for, thereby nullifying or possibly even exceeding the amount for which it was overdesigned. This e ectively accelerates material fatigue, which might be the possible cause of the small cracks in the RC beams which have been found on some TT railway sections, which is currently being investigated. A graphical user interface of the Double Beam method is provided for quick and e cient analysis. Empirical methods used to simulate the dynamic nature of a railway system are often used in the industry to simplify the dynamic loading by determining a dynamic amplitude factor (DAF) to be applied to a static load. An implicit dynamic FEA is therefore performed to obtain the DAF for the reference section, which is subsequently used for the comparison with in-situ de ection results. The results of dynamic analysis validates the proposed empirical analysis method, as the displacements obtained were very similar to actual eld test results, thereby also verifying the accuracy of the proposed analysis methods. The sensitivity of the TT system to design parameters is also investigated to indicate to which parameters the design is sensitive to and where small variations of these parameters require due consideration for future and analysis of the TT railway system.
AFRIKAANSE OPSOMMING: Die Tubular Track (TT) spoorweg stelsel is 'n dubbel balk modulêre treinspoor sisteem bestaande uit twee gewapende beton balke waarop staal spore voortdurend ondersteun word. Die balke word gekoppel deur gegalvaniseerde staal stawe vir laterale styfheid en word deurlopend ondersteun deur grond fondamente, en kan gebruik word om konvensionele dwarslêer en ballast spoorweg ondersteuning te vervang. Die TT spoorweg stelsel was in die verlede met verskeie analiseringsmetodes ontleed, maar het teenstrydige resultate gewerf. Die teenstrydige resultate beteken dat een van die analise metodes wat gebruik word vir die analisering en ontwerp van TT spoorweg seksies 'n onderskatting of oorskatting van verplasings, kragte, en spannings is; of beide metodes kan selfs verkeerd wees. Die hoofklem van hierdie ondersoek is dus die ontwikkeling en veri kasie van statiese en dinamiese analitiese metodes en modellering tegnieke wat gebruik kan word om die TT spoorweg stelsel akkuraat te simuleer. Die resultate en modelle van die vorige ontledings word nie uitdruklik in hierdie proefskrif ondersoek nie, maar dien as 'n motivering van hierdie ondersoek. Die TT stelsel word ondersteun deur verskeie grond strata wat vertikale ondersteuning verskaf, maar meetkundige modellering van die grond strata in die ontledingsmodelle veroorsaak 'n hoë vlak van kompleksiteit wat nie bruikbaar is vir algemene analises waar grondeienskappe meestal onbekend is. Die elastiese fondament teorie word daarom gebruik om die interaksie tussen die balk en die fondament akkuraat te simuleer, en vereenvoudig dus die analitiese modelle voldoende. Vereenvoudiging van 'n grond fondament deur 'n grond styfheid ondersteuning van die TT balk te simuleer is ondersoek en ontleed deur die resultate van eindige element analises van verskillende grond modelle te vergelyk. Bekende ontwerp parameters van vier bekend grondformasies wat tans gebruik word by TT spoorweg seksies word vir hierdie analises gebruik. Die eindige element analises van die grondformasies dui daarop aan dat daar 'n lineêre verwantskap tussen die modulus van grond reaksie vir 'n vierkantige plaat dratoets en 'n reghoekige, oneindige lang plaat dratoets bestaan. 'n Vierkantige plaat dratoets kan dus op terrein uitgevoer en aangepas word om die werklike styfheid van die grond ondersteuning van die TT spoorweg sisteem voor te stel. Die analitiese modelle wat gebruik word wissel van eenvoudige teoretiese modelle wat gebaseer is op elastiese fondament beginsels, twee-dimensionele (2D) balk elemente, asook komplekse driedimensionele (3D) soliede eindige element modelle. Die modelle wat gebruik is vir die ondersoek is die Enkel en Dubbel Balk elastiese fondament, PROKON 2D balke, ABAQUS 2D balke en ABAQUS 3D soliede element modelle. Hierdie reeks bied 'n duidelike aanduiding watter analiseringsmetodes akkuraat en haalbaar is vir die ontwerp van die TT stelsel. 'n In-situ verwysingsmodel met bekende de eksies en ontwerp parameters wat spesi ek is vir 'n TT spoorweg seksie word gebruik om die akkuraatheid en geldigheid van die verskillende analitiese metodes te analiseer. Die Dubbel Balk, ABAQUS 2D en ABAQUS 3D modelle verkry baie soortgelyke verplasings, buigmomente en skuifkragte vir 'n statiese analise, terwyl die PROKON en Enkel Balk modelle onbevredigende resultate verkry. Die PROKON model onderskat die maksimum buigmomente en skuifkragte in die staal spoor, en oorskat buigmomente en skuifkragte in die gewapende beton balk. Hierdie resultaat kan moontlik lei tot die onderontwerp van die staal spoor en dwing moontlik vir die gewapende beton balk om blootgestel te word aan groter buigmomente en skuifkragte as vir wat dit oorspronklik ontwerp is, en verontagsaam sodoende moontlik die kragte waarvoor dit oorontwerp is. Dit versnel e ektief materiaal vermoeiing, wat die moontlike oorsaak is van die klein krake wat gevind is in die gewapende beton balke op sommige TT spoorweg seksies wat tans ondersoek word. 'n Gra ese gebruikerskoppelvlak van die Dubbel Balk model is verskaf vir vinnige en doeltre ende ontleding. Empiriese metodes om die dinamiese aard van 'n spoorweg-stelsel te simuleer word dikwels gebruik in die bedryf om dinamiese belasting te vereenvoudig deur middel van die gebruik van 'n dinamiese amplitude faktor (DAF) wat op 'n statiese belasting aangewend word. 'n Implisiete dinamiese eindige element analise word dus uitgevoer om die DAF te ondersoek, wat daarna gebruik word vir die vergelyking met die in-situ de eksie resultate van die in-situ verwysingsmodel. Die resultate van die dinamiese analise bevestig dat die voorgestelde empiriese analise metode gebruik kan word, omdat die verplasings wat verkry baie soortgelyk was aan werklike veld toets resultate, en daardeur ook die veri ëring van die akkuraatheid van die voorgestelde analise metodes bewerkstellig. Die sensitiwiteit van die TT stelsel vir ontwerp parameters word ook ondersoek om aan te dui watter parameters die ontwerp voor sensitief is, en waar klein variasie in hierdie ontwerp parameters behoorlike oorweging vereis vir die toekomstige analisering en ontwerp van die TT spoorweg stelsel.
Munoz, Joshua. "Application of Multifunctional Doppler LIDAR for Non-contact Track Speed, Distance, and Curvature Assessment." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/77876.
Full textPh. D.
Cho, Hanseon. "Preemption strategy for traffic signals at intersections near highway-railroad grade crossings." Texas A&M University, 2003. http://hdl.handle.net/1969.1/406.
Full textYeo, Graeme James. "Monitoring railway track condition using inertial sensors on an in-service vehicle." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7531/.
Full textLackenby, Joanne. "Triaxial behaviour of ballast and the role of confining pressure under cyclic loading." Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060808.144325/index.html.
Full textWong, Wai. "A formal theory of railway track networks in higher-order logic and its applications in interlocking design." Thesis, University of Warwick, 1992. http://wrap.warwick.ac.uk/110541/.
Full textRADAMPOLA, Senanie Sujeewa, and senanie s. radampola@mainroads qld gov au. "EVALUATION AND MODELLING PERFORMANCE OF CAPPING LAYER IN RAIL TRACK SUBSTRUCTURE." Central Queensland University. Centre for Railway Engineering, 2006. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060817.115415.
Full textHolland, Chase Carlton. "Computational Methods for Estimating Rail Life." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/41436.
Full textMaster of Science
Basson, Conrad Charl Peter. "Analysis of defects occuring on rail tracks." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2752.
Full textSouth Africa’s railway system is the most highly developed in Africa. There are different kinds of transport systems in South Africa but rail transport is considered as one of an important element of the country’s transport infrastructure. In South Africa, over 2.4 million passengers make use of rail transport to get them to their destinations. However, evidence shows that train accidents have become a common occurrence across the country. Train-related accidents such as collision, derailments, platform change incidents and commuter accidents, cost South Africa over R400 million per year. The analysis of derailments indicates that the most significant single contributor to derailments is rail breaks. This contrasts considerably with prescribed relevant local and international benchmarks, which show a much lower percentage of derailments due to rail break. The frequency of derailments due to rail breaks in South Africa seems to be higher in the northern than the southern region. Furthermore, the proportion of rail breaks that result in derailment is considerably higher than the set benchmarks and therefore, if there is a rail break, then the probability of this translating into a derailment is astonishingly high. Equally, the high incidence of derailments due to rail breaks is affected by the train length and axle load and further exacerbated by the absence of track circuitry. Since derailments are a direct function of the incidence of rail breaks, focus is required to characterize the factors causing defects on rail lines. This study investigated steel rail material by characterising the piece of the damaged rail with the aim to gain a better understanding of the wear mechanism. Chemical composition analysis of steel rail sample was conducted with the use of a Scanning Electron microscopy. Hardness of steel rail was measured with a Vickers hardness tester. An Optical Microscopy was used to examine the microstructure features of the worn rail samples. This study discovered that the worn out rail, which was produced from high carbon steel with pearlite and ferrite microstructure, undergoes decarburization and a plastic deformation process. The decarburization process happens when the rail track is heated to 700 oC and above when the carbon atoms at the surface interact with the atmospheric gases and are removed from the steel as a gaseous phase. Plastic deformation is created when the iron atoms are heated above the elastic point resulting in the permanent movement of iron atoms.
Dong, K., D. P. Connolly, O. Laghrouche, P. K. Woodward, and Costa P. Alves. "The stiffening of soft soils on railway lines." Elsevier, 2018. https://publish.fid-move.qucosa.de/id/qucosa%3A73234.
Full textSevi, Adam F. "Physical modeling of railroad ballast using the parallel gradation scaling technique within the cyclical triaxial framework." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Sevi_09007dcc806723a3.pdf.
Full textVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed June 1, 2009) Includes bibliographical references (p. 117-124).
Babenko, Pavel. "VISUAL INSPECTION OF RAILROAD TRACKS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4013.
Full textPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science PhD
Yeung, Ngai-hang Ian. "Sound on track : study of railway noise in Hong Kong /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21301530.
Full textMoas, Eduardo. "Investigation of the finite element method for computing wheel/rail contact forces in steady curving." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/50064.
Full textMaster of Science
incomplete_metadata
Jo, Jinmyun. "Residual stress measurement in railroad car wheels." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54206.
Full textPh. D.
Yeung, Ngai-hang Ian, and 楊毅恆. "Sound on track: study of railway noise in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31254457.
Full textNagode, Clement Michel Jean. "Electromechanical Suspension-based Energy Harvesting Systems for Railroad Applications." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50611.
Full textThe focus of this research is on the development of vibration-based electromechanical energy harvesting systems that would provide electrical power in a freight car. With size and shape similar to conventional shock absorbers, these devices are designed to be placed in parallel with the suspension elements, possibly inside the coil spring, thereby maximizing unutilized space. When the train is in motion, the suspension will accommodate the imperfections of the track, and its relative velocity is used as the input for the harvester, which converts the mechanical energy to useful electrical energy.
Beyond developing energy harvesters for freight railcar primary suspensions, this study explores track wayside and miniature systems that can be deployed for applications other than railcars. The trackside systems can be used in places where electrical energy is not readily available, but where, however, there is a need for it. The miniature systems are useful for applications such as bicycle energy.
Beyond the design and development of the harvesters, an extensive amount of laboratory testing was conducted to evaluate both the amount of electrical power that can be obtained and the reliability of the components when subjected to repeated vibration cycles. Laboratory tests, totaling more than two million cycles, proved that all the components of the harvester can satisfactorily survive the conditions to which they are subjected in the field. The test results also indicate that the harvesters are capable of generating up to 50 Watts at 22 Vrms, using a 10-Ohm resistor with sine wave inputs, and over 30 Watts at peak with replicated suspension displacements, making them suitable to directly power onboard instruments or to trickle charge a battery.
Ph. D.
Verma, Manish. "Analytical approaches to railroad and rail-truck intermodal transportation of hazardous materials." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85961.
Full textMcNamara, John D. "Health monitoring of railroad tracks by elastic-wave based non-destructive testing /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3112830.
Full textCederlund, Harald. "The microbiology of railway tracks : towards a rational use of herbicides on Swedish railways /." Uppsala : Department of Microbiology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200644.pdf.
Full textKim, Hongsin. "Trackside measurement of critical zones in railway tracks." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6969/.
Full textHeinigk, Penelope Pearl. "The other side of the tracks : representations of gender in early railroad turmoil /." view abstract or download file of text, 2001. http://wwwlib.umi.com/cr/uoregon/fullcit?p3018370.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 204-207). Also available for download via the World Wide Web; free to University of Oregon users.
Heunis, Johannes Jacobus. "Material models for rail pads." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6643.
Full textENGLISH ABSTRACT: The vibrations and noise “pollution” that rail vehicles produce have become of particular concern in recent years. More pressure is being placed on operators of trains and trams (especially those operating in urban environments) to reduce their impact on neighbouring infrastructure. This project investigated the infrastructure available for vibration and noise mitigation and generated material models for some of the materials used in these types of rail infrastructure. The most common type of rail infrastructure used in South Africa is ballasted sleepers. Rail pads are sometimes used to reduce the transmitted vibration of these sleepers; this study focused on the materials used in the manufacture of these pads. Since most of these materials can be described as resilient/viscoelastic, the study of literature regarding these materials is essential within the scope of this project. Models found in literature were adapted by the addition of a non-linear stiffness element to account for the material behaviour at higher preloads. Three commercially available materials were tested and optimisation algorithms applied to determine their material coefficients (damping and stiffness), focusing on the preload and frequency dependency of these coefficients.
AFRIKAANSE OPSOMMING: Die vibrasie en geraas “besoedeling” wat spoor voertuie genereer het in die in die afgelope paar jare van kritieke belang geword. Meer druk word op operateurs van treine en trems geplaas (veral die operateurs met operasies in stedelike gebiede) om hulle impak op aangrensende infrastruktuur te verminder. Hierdie projek is dus daarop gemik om te bepaal watter infrastuktuur beskikbaar is vir die vermindering van vibrasie en geraas asook die ontwikkeling van materiaal modellle vir sommige van die materiale wat gebruik word in hierdie tipes van spoor infrastruktuur. Die mees algemene spoor infrastruktuur wat gebruik word in Suid-Afrika is dwarslêers met ballas. Spoor blokke word soms gebruik om die oordrag van vibrasies te verminder vir hierdie dwarslêers en daarom het hierdie studie fokus geplaas op die materiale wat gebruik word in die vervaardiging van hierdie blokke. Aangesien die meeste van hierdie materiale beskryf kan word as veerkragtig/visco, is 'n literatuurstudie oor hierdie materiale noodsaaklik binne die bestek van hierdie projek. Modelle wat gevind is in die literatuur is aangepas deur 'n nie-lineêre styfheids element by te voeg wat voorsiening maak vir die materiale se gedrag by hoër voorspannings. Drie algemene kommersieël beskikbare materiale is getoets en optimeringsprossesse is toegepas om hulle materiaal koëffisiënte (demping en styfheid) te bepaal met die klem geplaas op die voorspanning en frekwensie afhanklikheid van hierdie koëffisiënte.
Chang, Jiang. "Applying two statistical models to condition-based machinery inspection and maintenance : railroad car truck case." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36993.
Full textFeng, Yazhe. "Distribution Planning for Rail and Truck Freight Transportation Systems." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77140.
Full textPh. D.
Grunow, Tristan R. "Tracks to Teito : the Tokyo train network and the Meiji quest for domestic hegemony and international recognition /." Connect to title online (Scholars' Bank), 2008. http://hdl.handle.net/1794/8016.
Full text