Non-destructive technologies for sustainable assessment and monitoring of railway infrastructure: a focus on GPR and InSAR methods

2021 ◽  
Vol 80 (24) ◽  
Author(s):  
Chiara Ferrante ◽  
Luca Bianchini Ciampoli ◽  
Andrea Benedetto ◽  
Amir M. Alani ◽  
Fabio Tosti
Keyword(s):  
Railway Infrastructure ◽  
Assessment And Monitoring ◽  
Non Destructive

Seasonal Effect on the Optimization of Rail Defect Inspection Frequency

2013 ◽  
Author(s):  
Xiang Liu ◽  
C. Tyler Dick ◽  
Alexander Lovett ◽  
Mohd Rapik Saat ◽  
Christopher P. L. Barkan
Keyword(s):  
Seasonal Variation ◽  
Ultrasonic Inspection ◽  
Transportation Safety ◽  
Seasonal Effect ◽  
Infrastructure Management ◽  
Defect Inspection ◽  
Railroad Industry ◽  
Railway Infrastructure ◽  
Rail Inspection ◽  
Non Destructive

Broken rails are the most common cause of severe freight-train derailments on American railroads. Reducing the occurrence of broken-rail-caused derailments is an important safety objective for the railroad industry. The current practice is to periodically inspect rails using non-destructive technologies such as ultrasonic inspection. Determining the optimal rail defect inspection frequency is a critical decision in railway infrastructure management. There is a seasonal variation in the occurrence of broken rails that result in train derailments. This paper quantifies the effect of this seasonal variation on the risk-based optimization of rail inspection frequency. This research can be incorporated into a larger framework of broken rail risk management to improve railroad transportation safety.

scholarly journals Improvement recommendations for railway infrastructure maintenance

2020 ◽  
Vol 157 ◽  
pp. 01001
Author(s):  
Zdenka Popović ◽  
Luka Lazarević ◽  
Ljiljana Brajović ◽  
Milica Mićić ◽  
Nikola Mirković
Keyword(s):  
Early Detection ◽  
Network Performance ◽  
Ride Comfort ◽  
Theoretical Models ◽  
Railway Network ◽  
Track Geometry ◽  
Railway Infrastructure ◽  
Infrastructure Maintenance ◽  
Non Destructive

Based on the railway network performance, Infrastructure Manager is obligated to define the Maintenance plan for railway infrastructure, which contains corresponding values for intervention limits and alert limits. This paper considers vehicle response to track excitation due to the rail defect (code 2202 according to defect classification). It is indicated that theoretical models and acceleration measurements could be used to assess the quality of track geometry and ride comfort. The importance of early detection of irregularities of superstructure and substructure was emphasized. Moreover, the importance of inspection and preventive maintenance on the modern railway infrastructure was considered. According to the previous, the authors recommend non-destructive methods for inspection and early detection of irregularities of railway infrastructure.

scholarly journals Non-Destructive Technologies for a Sustainable Assessment and Monitoring of Railway Infrastructures: A Focus on GPR and InSAR Methods

2021 ◽  
Author(s):  
Chiara Ferrante ◽  
Luca Bianchini Ciampoli ◽  
Andrea Benedetto ◽  
Amir M. Alani ◽  
Fabio Tosti
Keyword(s):  
Local Level ◽  
Real Life ◽  
Integrated Approach ◽  
Special Focus ◽  
Railway Ballast ◽  
Level Information ◽  
Assessment And Monitoring ◽  
Ground Penetrating ◽  
Asset Managers ◽  
Non Destructive

Abstract Health monitoring of ballast in railway infrastructures is crucial to assure structural stability and efficiency of the operations. To this extent, an efficient and sustainable management of maintenance is fundamental for asset managers in setting up strategic and effective action plans. Amongst the available methods to assess the conditions of railway infrastructures, non-destructive technologies (NDT) are gaining popularity due to their capability to overcome main drawbacks of traditional routine methods, such as digging trenches and visually inspect locations assumed as critical along the track. The present paper presents an overview of the use of the Ground Penetrating Radar (GPR) and the Interferometric Synthetic Aperture (InSAR) technologies for a sustainable monitoring of railway infrastructures. Specifically, main traditional and non-destructive methods used for maintenance of railway ballast materials are presented with a special focus on their sustainability. A review about the research methods on the use of GPR and InSAR technologies for railway infrastructures also reported, including main investigations carried out in the laboratory and the real-life environments. Furthermore, a conceptual framework based on an integrated approach including satellite-based and ground-based investigations is proposed, where network and local level information can be merged for the detection of critical sections and the implementation of a more advanced predictive maintenance system.

scholarly journals Experiences of Dynamic Identification and Monitoring of Bridges in Serviceability Conditions and after Hazardous Events

2020 ◽  
Vol 5 (10) ◽  
pp. 86
Author(s):  
Carlo Rainieri ◽  
Matilde A. Notarangelo ◽  
Giovanni Fabbrocino
Keyword(s):  
Structural Health Monitoring ◽  
Modal Analysis ◽  
Health Monitoring ◽  
Structural Damage ◽  
Remote Detection ◽  
Structural Behavior ◽  
Dynamic Identification ◽  
Civil Structures ◽  
Assessment And Monitoring ◽  
Non Destructive

Operational Modal Analysis (OMA) currently represents an appealing technique for the non-destructive assessment and health monitoring of civil structures and infrastructures. Many applications have appeared in the literature in the last decade, demonstrating how this technique can support the observation and understanding of the structural behavior of bridges at different stages of their lifecycle and the remote detection of structural damage. The present paper describes some explanatory applications of OMA and modal-based Structural Health Monitoring (SHM) referring to bridges that have been carried out by the authors over the years. Some aspects related to the evolution of OMA in the last decade are summarized by means of the presentation and discussion of a number of case studies; they cover the fields of the non-destructive assessment and monitoring of bridges in serviceability conditions as well after hazardous events and remark the potential and the opportunities of OMA in the modern management of road infrastructures.

Luminescence from individual dislocations in II-VI and III-V semiconductors

1991 ◽  
Vol 49 ◽  
pp. 834-835
Author(s):  
J W Steeds
Keyword(s):  
Group Iv ◽  
Luminescence Properties ◽  
Carrier Recombination ◽  
Transmission Electron ◽  
Wide Range ◽  
Basic Physics ◽  
Semiconducting Compounds ◽  
Diamond Group ◽  
Non Destructive ◽  
Technological Significance

There is a wide range of experimental results related to dislocations in diamond, group IV, II-VI, III-V semiconducting compounds, but few of these come from isolated, well-characterized individual dislocations. We are here concerned with only those results obtained in a transmission electron microscope so that the dislocations responsible were individually imaged. The luminescence properties of the dislocations were studied by cathodoluminescence performed at low temperatures (~30K) achieved by liquid helium cooling. Both spectra and monochromatic cathodoluminescence images have been obtained, in some cases as a function of temperature.There are two aspects of this work. One is mainly of technological significance. By understanding the luminescence properties of dislocations in epitaxial structures, future non-destructive evaluation will be enhanced. The second aim is to arrive at a good detailed understanding of the basic physics associated with carrier recombination near dislocations as revealed by local luminescence properties.

Forensic Identifications Aided by Scanning Electron Microscopy of Silicone-Epoxy Microreplicas of Calcified and Cornified Structures

1975 ◽  
Vol 33 ◽  
pp. 678-679 ◽  
Author(s):  
R.F. Sognnaes
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Forensic Science ◽  
George Washington ◽  
Epithelial Surface ◽  
Extended Application ◽  
Tissue Surfaces ◽  
Non Destructive ◽  
Scanning Electron ◽  
Surface Changes

Sufficient experience has been gained during the past five years to suggest an extended application of microreplication and scanning electron microscopy to problems of forensic science. The author's research was originally initiated with a view to develop a non-destructive method for identification of materials that went into objects of art, notably ivory and ivories. This was followed by a very specific application to the identification and duplication of the kinds of materials from animal teeth and tusks which two centuries ago went into the fabrication of the ivory dentures of George Washington. Subsequently it became apparent that a similar method of microreplication and SEM examination offered promise for a whole series of problems pertinent to art, technology and science. Furthermore, what began primarily as an application to solid substances has turned out to be similarly applicable to soft tissue surfaces such as mucous membranes and skin, even in cases of acute, chronic and precancerous epithelial surface changes, and to post-mortem identification of specific structures pertinent to forensic science.

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