Method of track vertical stiffness estimation based on experiment

Droździel, J.; Sowiński, B.

doi:10.2478/v10174-010-0009-y

Cited by 8 publications

(7 citation statements)

References 2 publications

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“…Drozdziel and Sowinski, presented a method to estimate the vertical stiffness of a railway track based on the measurement of a track's vertical deflections during quasi-static railway vehicle moves along the track (at 5 km/h). The results analysed the film of the train passage, sections of frames selected and saved for post-processing non-contact method consisting of two high-resolution cameras (up to 0.05 mm) and two targets [46]. Based on the results and discussions the novelty was reported in terms of the accuracy of the vibration compensation data, one point is taken at an interval of 5m, and a total of 20 points are measured, compare and analyse with dynamic real-time detection data.…”

Section: Resultsmentioning

confidence: 99%

Vibration compensation for railway track displacement monitoring system using biomedical image processing concept

Wang¹,

Lv²,

Bhola

et al. 2022

The Journal of Engineering

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Vibration compensation in track displacement monitoring is explored by using rail image feature points. The key point is to compare the image of the rail to be tested with the image of the standard rail. A downstream section of Metro Line A is selected for real time analysis of image. The sampling frequency of the detection system is 0.5m/point, and the driving speed of the detection vehicle is about 40km/h, take the distance of 100m between K23+000‐K22+900 of kilometer mark, total 200 points, and analyze the image data by grey scale conversion concept. In order to verify the accuracy of the vibration compensation data, one point is taken at an interval of 5m, and a total of 20 points are measured, and compare and analyze with dynamic real‐time detection data. After vibration compensation, the geometric parameters of the contact rail are closer to the expected value, and the maximum error can be controlled within ±3mm. Using biomedical image‐based processing concept to realize the track displacement monitoring method, which meets the requirements of non‐contact measurement, and the degree of automation is high, it can be monitored and alarmed in real time, and it has a good application prospect.

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Section: Resultsmentioning

confidence: 99%

Vibration compensation for railway track displacement monitoring system using biomedical image processing concept

Wang¹,

Lv²,

Bhola

et al. 2022

The Journal of Engineering

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“…A coefficient comparison of (16) with the material law from the direct shear test according to (2) shows that the angle is identical to the friction angle φ of the crushed stone. It follows that the load transfer occurs within a load transfer cone at the edge of which the yield point of the material is reached (Fig.…”

Section: Load Transfer In Crushed Stonementioning

confidence: 97%

“…Fig. 10, the tangential force component T dependent on the weight G and the normal force component N are inserted into the material law from the direct shear test according to (2). The following equation (17) appears:…”

Section: Load Transfer In Crushed Stonementioning

confidence: 99%

“…The main problem of the measurement is that it was done for box test without free ballast slopes. The vertical stiffness of the track, including the stiffness of ballast layer, is considered by many authors (Droździel, et al 2010, Grossoni, et al 2018) as a parameter that characterize the ability of the track to resist to residual deformations.…”

Section: Introductionmentioning

confidence: 99%

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Stiffness and strength of structural layers from cohesionless material

Gerber

Sysyn

Zarour

et al. 2019

AoT

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The deformation modulus and permissible stress are two independent parameters that depict the carrying capacity of foundations, including earthworks and ballast layer. Nevertheless, while designing the track superstructure or controlling its state, they are considered separate to each other, even though they are terms of the same measure. The scientific problem is due to the practical necessity of unified building rules and standards. The carrying capacity of earthworks and foundations is regulated with standards based both on deformation and on stress criteria, which are not related to each other. This plays particularly important role for railway ballast layer, as an intermediate between the solids and soil. The objective of the present research is to estimate the relationship between deformation modulus and the strength of ballast layer. An overview of modern approaches according to the relation between the stiffness, deformation modulus, elasticity and strength of soils and crushed stone is done. The strength of ballast layer is considered depending on the experimental test: the direct shear test, compressive strength in the uniaxial or biaxial stress state. Load transfer model in crushed stone is proposed. The load transfer angle and cone of loading distribution are determined based on the load transfer and compressive strength models. The relation between deformation modulus and strength is derived from two simple laboratory experiments with cohesionless ballast material. The experiment tests have shown that the ballast stiffness as well as its strength are influenced with the support stress. The measurement of elastic and residual settlements for the different support stress values enables to determine the relation. It can be potentially used for the development of methods for the ballast compaction control, unification of construction norms. The research result should be considered as an approach for unification of two different ways to reflect the carrying capacity of ballast layer.

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“…Stiffness value of the ballast layer is basically used for track design, track maintenance and track vibration behavior modification. 39–41 Plate load test results are highly related to the condition of performing tests such as load rating, consolidation of ballast particles during preparing specimens. 42 Plate load test (PLT) which is usually used for measuring the vertical stiffness and elasticity modulus of granular material has been standardized in ASTM C-29, 43 AASHTO T19, and also in British Standard 812.…”

Section: Lab Test Planmentioning

confidence: 99%

The improvement of the dynamic behavior of railway bridge transition zone using furnace slag reinforcement: A numerical and experimental study

Jing

Siahkouhi

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Transition zones between railway tracks and bridge decks can cause higher dynamic impacts. A solution is smoothly changing the track stiffness by gradually mixing steel furnace slag into the stone ballast. A nominated bridge transition zone is divided into 5 blocks of 7 meters long, with the mixing percentages of 0%, 25%, 50%, 75% and 100%. The mechanical behaviors of furnace slag-ballast combinations (FS-BCs) were studied using experiments of shear strength test, Los Angles abrasion index and plate load test. Furthermore, the dynamic behavior of bridge transition zone with FS-BCs blocks was investigated using a field validated FEM model. Results show that the 100%, 75%, 50% and 25% furnace slag by weight of ballast can increase the shear strength and ballast layer bending modulus by 13%, 12%, 9% and 7% at speed of 300 km/h compared with those of the stone ballast. The FEM study shows that rail deflections are reduced about 20%, 14%, 21% and 16% at speed of 300 km/h corresponding to 100%, 75%, 50% and 25% FS-BCs and accelerations are significantly reduced as well as increasing FS content of each block in bridge transition zone so that a smooth bridge transition zone can be achieved.

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Method of track vertical stiffness estimation based on experiment

Cited by 8 publications

References 2 publications

Vibration compensation for railway track displacement monitoring system using biomedical image processing concept

Vibration compensation for railway track displacement monitoring system using biomedical image processing concept

Stiffness and strength of structural layers from cohesionless material

The improvement of the dynamic behavior of railway bridge transition zone using furnace slag reinforcement: A numerical and experimental study

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