Measurement methods and analysis tools for rail irregularities: a case study for urban tram track

Chiacchiari, Laura; Loprencipe, Giuseppe

doi:10.1007/s40534-015-0070-6

Cited by 25 publications

(18 citation statements)

References 22 publications

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“…For trains to run on time the condition of the infrastructure must be sufficient [3]. The purpose of a railway track is to provide a stable, safe, and efficiently guided platform for the train to run at various speeds with different axle loadings [24]. There are two types of railway tracks: conventional ballasted tracks and slab tracks [5].…”

Section: Railway Infrastructurementioning

confidence: 99%

“…Sleepers transfer the load from the vehicles into the ballast and are constructed of concrete. The ballast bed anchors the track, creates bearing capacity for the track, and prevents lateral and longitudinal movement [27]. The sub-ballast is the prime track foundation; it prevents vertical movements based on the thickness of the subgrade [26].…”

Section: Railway Infrastructurementioning

confidence: 99%

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Improvement of railway performance: a study of Swedish railway infrastructure

2016

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The volume of rail traffic was increased by 5 % from 2006 to 2010, in Sweden, due to increased goods and passenger traffic. This increased traffic, in turn, has led to a more rapid degradation of the railway track, which has resulted in higher maintenance costs. In general, degradation affects comfort, safety, and track quality, as well as, reliability, availability, speed, and overall railway performance. This case study investigated the needs of railway stakeholders responsible for analysing the track state and what information is necessary to make good maintenance decisions. The goal is to improve the railway track performance by ensuring increased availability, reliability, and safety, along with a decreased maintenance cost. Interviews of eight experts were undertaken to learn of general areas in need of improvement, and a quantitative analysis of condition monitoring data was conducted to find more specific information. The results show that by implementing a long-term maintenance strategy and by conducting preventive maintenance actions maintenance costs would be reduced. In addition to that, problems with measured data, missing data, and incorrect location data resulted in increased and unnecessary maintenance tasks. The conclusions show that proactive solutions are needed to reach the desired goals of improved safety, improved availability, and improved reliability. This also includes the development of a visualisation tool and a life cycle cost model for maintenance strategies.

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Section: Railway Infrastructurementioning

confidence: 99%

Section: Railway Infrastructurementioning

confidence: 99%

Improvement of railway performance: a study of Swedish railway infrastructure

2016

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“…The conclusions in [24] show that proactive solutions are needed to reach the desired goals of improved safety, improved availability, and improved reliability. Chiacchiari and Loprencipe in [25] concluded that rail irregularities, particularly those in urban railway infrastructures, are one of the main causes of noise and vibration generation. Monitoring defects on a periodic basis enables a network's rail managers to apply proactive measures to limit further damage.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Measuring Square in the Measurement of the Circular Curve of Rail Transport Tracks

Kampczyk

2020

Sensors

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In rail transport, measuring the actual condition of a circular curve of a railway track is a key element of track position monitoring not only during operation but also during final works. Predicting changes in its position in the horizontal plane is one of the most important related scientific issues. This paper presents the results of measurements performed with an innovative measuring device called the Magnetic-Measuring Square (MMS). The aim of the research was to demonstrate the acceptability of using the MMS. Horizontal versines of a rail track curve were measured as three neighboring points on a curve (using the method of lacing/stringlining, also called the three-point or the Hallade method), and the perpendicularity of rail joints and shortenings were measured. The MMS device presented in this article was used to measure versines and differences in rails lengths (rail shortenings in the curve) in the operating mode involving a laser distance meter with a laser beam (laser power P < 1 mW, laser wavelength λ = 635 nm) with a target cross, a camera, and a surveying measuring disk. The measurement results confirmed that it is possible to employ the MMS to monitor the geometry of railway track fragments such as track transition curves and railway track curves in rail transport.

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“…It has proven effective to combine numerical studies together with experimental results in studies on the subway induced vibration. Chiacchiari [39] discussed measurement methods for rail corrugation and proposed an application method for rail irregularities. Kaynia [40] performed a measurement of the vibration induced railway embankment by high speed trains and developed a rigorous numerical model for the prediction of ground response.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and In-Situ Measurement of Ground-Borne Vibration Due to Subway System

Yang

Lü

2018

Sustainability

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A coupled finite element–infinite element boundary method performed by the harmonic analysis based on the commercial software ABAQUS was verified by comparing it with the thin layer method to address the issue of subway induced vibration, a major environmental concern in urban areas. In addition, an interface program was developed to automatically read the simulation result files in the harmonic analysis, and then put the data into MATLAB, achieving the frequency domain analysis. Moreover, a site measurement was performed on a practical engineering track bed-tunnel lining-surrounding formation located on Line 2, Shanghai Metro and rich vibration data were acquired. Then, the corresponding simulation model was established and the numerical results were compared with the measured data based on the developed program, which was verified applicable for the practical engineering of subway induced vibration on the soft site. The proposed prediction formula of the vibration level, by comparison with the measurement, is applicable for the prediction in subway induced vibration. The results show that there exists a vibration amplifying zone a certain distance to the tunnel under high frequency loads due to the wave propagation and reflection. Finally, a parametric study was conducted in an elastic half-space simulation to investigate the influence of model widths and depths with infinite element boundary on the numerical results. The higher performance of the combined finite element–infinite element boundary method, which can decrease the model sizes in widths and heights 50% effectively, was demonstrated. Consequently, the coupled finite element–infinite element boundary method and developed frequency analysis with interface program provide rational numerical methods for the models of subway induced vibration.

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Measurement methods and analysis tools for rail irregularities: a case study for urban tram track

Cited by 25 publications

References 22 publications

Improvement of railway performance: a study of Swedish railway infrastructure

Improvement of railway performance: a study of Swedish railway infrastructure

Magnetic-Measuring Square in the Measurement of the Circular Curve of Rail Transport Tracks

Numerical Simulation and In-Situ Measurement of Ground-Borne Vibration Due to Subway System

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