Track Data Oriented Maintenance Intervention Limit Determination For Ballasted Light Rail Tracks Through Multibody Simulations
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Track Data Oriented Maintenance Intervention Limit Determination For Ballasted Light Rail Tracks Through Multibody Simulations
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Author : David Camacho Alcocer
language : en
Publisher: BoD – Books on Demand
Release Date : 2021-07-13
Track Data Oriented Maintenance Intervention Limit Determination For Ballasted Light Rail Tracks Through Multibody Simulations written by David Camacho Alcocer and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-07-13 with Technology & Engineering categories.
Light rail trains (LRT) are an important part of public transport but due to perceived high life-cycle costs are not always considered suitable. Life cycle cost reduction might be achieved through a knowledge-based maintenance management rather than just on experience. This work develops limits of maintenance and renewal of LRT systems based on vehicle reactions to the current track quality through measured data, multibody simulations and track geometry indices. An approach based on knowledge would lead to a track condition which allows a safe, comfortable, and under an appropriate maintenance strategy, economically profitable operation.
Track Data Oriented Maintenance Intervention Limit Determination For Ballasted Light Rail Tracks Through Multibody Simulations
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Author : David Camacho Alcocer
language : en
Publisher:
Release Date : 2019
Track Data Oriented Maintenance Intervention Limit Determination For Ballasted Light Rail Tracks Through Multibody Simulations written by David Camacho Alcocer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Ballast Railroad Design Smart Uow Approach
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Author : Buddhima Indraratna
language : en
Publisher: CRC Press
Release Date : 2018-06-27
Ballast Railroad Design Smart Uow Approach written by Buddhima Indraratna and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-27 with Science categories.
The rail network plays an essential role in transport infrastructure worldwide. A ballasted track is commonly used for several reasons, including economic considerations, load bearing capacity, rapid drainage and ease of maintenance. Given the ever-increasing demand for trains to carry heavier axle loads at greater speeds, traditional design and construction must undergo inevitable changes for sustainable performance. Ballast is an unbounded granular assembly that displaces when subjected to repeated train loading affecting track stability. During heavy haul operations, ballast progressively deteriorates and the infiltration of fluidized fines (mud pumping) from the underlying substructure and subgrade decreases its shear strength and also impedes drainage, while increasing track deformation and associated maintenance. Features: serves as a useful guide to assist the practitioner in new track design as well as remediating existing tracks. research discussed in this book has made considerable impact on the railway industry. resulting from collaborative research between academia and industry, incorporating sophisticated laboratory tests, computational modelling and field studies. This book presents a comprehensive procedure for the design of ballasted tracks based on a rational approach that combines extensive laboratory testing, computational modelling and field measurements conducted over the past two decades. Ballast Railroad Design: SMART-UOW Approach will not only become an imperative design aid for rail practitioners, but will also be a valuable resource for postgraduate students and researchers alike in railway engineering.
Data Driven Condition Assessment Of Track Substructure
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Author : Saharnaz Nazari
language : en
Publisher:
Release Date : 2024
Data Driven Condition Assessment Of Track Substructure written by Saharnaz Nazari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024 with categories.
The ballasted track is the most popular in North America and the most cost-effective, especially for running freight trains. In track, the substructure plays a critical role in maintaining track geometry and consequently affects the efficiency and safety of rail operations. The substructure is vulnerable to several defects, such as fouling, formation of pockets, poor drainage, and settlements. However, maintaining the substructure presents challenges, and timely detection of any adverse change in its condition is a significant area of focus and concern for the railroad industry. Visual methods, as the primary way of substructure inspection, cannot catch defects. Other Traditional procedures for track substructure evaluation are invasive and invariably result in disruptions of train operations and increased financial expenditures for the industry. As such, track maintenance is usually scheduled and carried out at fixed intervals. However, these maintenance actions may not always be timely or target the right area or issue without knowing the exact condition of the substructure and its components. With recent advances in technology and the development of data analysis tools, the railroad industry has adopted innovative inspection and monitoring techniques for the track infrastructure as complementary to traditional methods in order to overcome some limitations inherent in the old regimes and gain more accurate insights into the state of the track substructure. These new track monitoring techniques employ sensors to gather the information that helps railroaders detect defects in time and adopt appropriate maintenance measures reducing unexpected breakdowns in services and saving time and money for the industry. Today, a large variety of sensor-based systems are available, each generating vast amounts of data. A new challenge for the railroaders is choosing the right monitoring system that encompasses the best instrumentation for gathering and processing the information so as to inform them of the appropriate maintenance measures to be undertaken. The objective of this research study is to make use of the advances in big data analytics and build and evaluate a data-driven model that works with two emerging monitoring technologies, namely the SmartRock and the Smartgrid, to develop a system for monitoring the track substructure. The developed model together with these monitoring systems proved to be capable of damage identification in an under-operation track. This study is a stepping-stone toward a real-time data collection and integrated analysis system, allowing railroad companies to more accurately identify the condition of their ballast and the trackbed. This information enables them to proactively assign maintenance windows that ensure safe and efficient train operation with the least amount of train delay due to maintenance outages. The first stage of this research study focused on the ballast layer and developing a data-driven method based on pattern recognition techniques to identify fouling in track using the SmartRock sensor. To this end, SmartRock was applied in a field test to record the railroad ballast particle movement in the revenue service lines where mud spots existed. The result of this study shows that this system can accurately characterize the ballast condition. Later, a similar methodology was applied to the data collected from another field experiment to distinguish the differences in ballast particle performance due to under-tie pad utilization in track. The analysis is performed by coupling Autoregressive Moving Average (ARMA) as a sensitive feature with a supervised classification technique. The result showed that SmartRock could measure the performance of railroad ballast particles with high reliability. The second part of this dissertation delves deeper into the substructure to provide a system (monitoring device together with an analysis methodology) to characterize the performance of the ballast and the subgrade in track. To this end, a new monitoring technology composed of a sheet of geogrid instrumented with strain gauges was developed -- The same will be referred to as Smartgrid in this dissertation. The Smartgrid can measure vertical stress and horizontal strain at the ballast-soil interface at four different spots in the track. These spots are under the middle of the tie, under the railseat, at the tie end, and in the crib under the railseat. This system helps railroaders get an insight into the performance of the ballast and the soil separately, contrary to conventional parameters, such as the track modulus, which measures the track substructure's stiffness as a whole. The Smartgrid was tested in the laboratory. The laboratory experiment helped develop a statistical analysis methodology that together with data from the Smartgrid could characterize the health conditions of ballast and subgrade individually. Further, this system was also tested in a field on revenue service lines that had mud spots in order to verify its efficacy. This study's result shows the Smartgrid method's potential in facilitating maintenance planning of railway tracks for a safer and more efficient transportation system.
Advanced Rail Geotechnology Ballasted Track
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Author : Buddhima Indraratna
language : en
Publisher:
Release Date : 2023
Advanced Rail Geotechnology Ballasted Track written by Buddhima Indraratna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with Ballast (Railroads) categories.
"Ballast plays a vital role in transmitting and distributing the train wheel loads to the underlying track substructure. The load bearing capacity, safe train speed, levels of noise and vibration as well as passenger comfort depend on the behaviour ballast through particle interlocking and corresponding deformation of this granular assembly. Attrition and breakage of ballast occur progressively under heavy and continual cyclic loading, causing track deterioration and rail misalignment affecting safety, while exacerbating the intensity of track maintenance. In the absence of realistic computational models, the track substructure is traditionally designed using mostly empirical approaches. In this book, the authors present the detailed information on the strength, deformation, and degradation aspects of fresh and recycled ballast under monotonic, cyclic and impact loading using innovative geotechnical testing devices. A constitutive model for ballast incorporating particle breakage is presented representing a more realistic stress-strain response. The mathematical formulations and numerical models are validated using controlled experimental simulations and fully instrumented field trials. Revised ballast gradation is described to provide greater track resiliency and extended longevity. The book also provides detailed description of geosynthetics for substructure improvement considering track deterioration caused by particle degradation, fouling and impeded drainage. New to this 2nd edition are extensive discussions on subgrade soil stabilisation, causes and mechanisms of soil fluidisation (mud pumping) under cyclic loading, as well as preventive and remedial measures to alleviate undue instability of ballast tracks. This book should prove most beneficial for final year civil engineering students and for postgraduate teaching and learning. It is an ideal supplement for practicing railway engineers and researchers engaged in the challenging tasks of future track design for heavier and faster trains"--