Measurement Distortion Analysis of Repetitive and Isolated Track Geometry Irregularities

Ágh, Csaba

doi:10.3311/ppci.17638

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…In this respect, the traditional amplitude measurement method is of little effect, and the advanced evaluation methods based on chord measurement theory have been developed. 37 Among them, the most representative mid-point chord measurement method is widely used to evaluate railway track irregularity because it pays attention to the change rate of displacement. The focused operation stability of high-speed train is actually affected by the change of track irregularity, which means mid-point chord measurement shares the same evaluation dimension as train operation stability thus can be adopted to evaluate the track irregularity.…”

Section: A Simplified Evaluation Framework Of Dynamic Track Irregularitymentioning

confidence: 99%

Influence mechanism of vertical dynamic track irregularity on train operation stability of long-span suspension bridge

Wang

Yang

Ning

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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The track needs to maintain sufficient foundation stiffness to ensure its smoothness and meet the operation stability requirements of high-speed trains. However, the train-induced deformation of flexible suspension railway bridge will inevitably induce the obvious vertical dynamic track irregularity and threaten train operation stability. Combined with a long-span suspension bridge with a main span of 1092 m, this paper provides a new analysis framework for evaluating the track smoothness on the long-span bridge from the perspective of train operation stability. The comprehensive train-track-bridge coupling vibration analysis is conducted to highlight the impact factors on train operation stability and identify the dynamic track irregularity. The simplified evaluation framework of dynamic track irregularity are then proposed to evaluate the track smoothness. The results show that the vertical dynamic track irregularity of long-span bridges is obviously affected by action of train, random track irregularity and overall temperature load. It is quite different from the static track irregularity in terms of alignment and spatial frequency. By separating the dynamic track irregularity according to the wavelength limit of 200 m, two alignment evaluation methods are proposed, namely the mid-chord measurement within 200 m wavelength and curvature method above 200 m wavelength, to reveal the different contributions of dynamic track irregularity component to the vertical car-body acceleration. The influence mechanism of dynamic track irregularity caused by different factors on the stability of train operation is finally identified from the perspectives of vibration acceleration and centrifugal acceleration.

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Section: A Simplified Evaluation Framework Of Dynamic Track Irregularitymentioning

confidence: 99%

Influence mechanism of vertical dynamic track irregularity on train operation stability of long-span suspension bridge

Wang

Yang

Ning

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Therefore, using frequency-domain (spectral analysis) and time-frequency-plane analysis methods is essential for analyzing the track geometry waveform. One of the main railway applications of spectral (frequency domain) analysis methods is the "de-coloring" of the track geometric parameters recorded by the versine (chord measuring) system and filtering them to a prescribed wavelength range(s) [17,21]. Another key application is the decomposition of the measured signal into wavelength components (modes) and the track position identification of each component.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Track Gauge and Alignment Parameters of Ballasted Railway Tracks Based on Real Measurements Using Signal Processing Techniques

et al. 2023

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This paper deals with the time-frequency characteristic analysis for track geometry irregularities using field data recorded by a comprehensive track inspection train. The parameters of the track gauge and the left and right rail alignment are considered to identify their characteristic wavelengths and the locations of their waveforms. In addition to the conventional time and frequency domain analysis, auto-adaptive signal decomposition techniques are used on four pre-selected track sections. During the time series analysis of the track gauge, the cumulative difference from the mean value is calculated, which makes it possible to distinguish the track section constructed with non-standard initial track gauges. The sensitive wavelengths of the track irregularities are obtained from the proper allocation of wavelength ranges in the Fourier Amplitude Spectrum of the original signal and the Fourier transform of the components detected by the Variational Mode Decomposition. This analysis can elucidate the wavelengths and positions of track irregularities that affect vehicle responses.

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Connection Between Track Geometry Quality and Dynamic Vehicle Response at Various Speeds

Ágh

2023

BJRBE

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Track geometry measurements are widely used for describing track quality. However, derailments and track deterioration are caused by forces arising in vehicle-track system. This research focuses on two types of vehicle response. Firstly, the influence of the longitudinal level irregularities on the vertical wheel-rail forces was examined. Secondly, the correlation between the lateral axle box acceleration and the cross level irregularities was investigated. Track geometry and vehicle response data were acquired simultaneously by a track recording car, formed from a passenger car, at various speeds up to 130 km/h. Vehicle-track forces were calculated based on accelerometers mounted on the car body, bogies and axle boxes, considering mass and moment of inertia. Non-linear regressions resulted in vertical vehicle-track force estimation functions. It was proven that the use of second spatial derivatives of the longitudinal level gave a better estimation than the use of reference TQIs according to European Standard EN 13848-6. A linear relationship was found between the speed and standard deviation of vertical vehicle-track forces. On straight sections with constant speed, correlation coefficients of around 0.8 were found between second spatial derivatives of cross level and lateral axle box acceleration.

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Measurement Distortion Analysis of Repetitive and Isolated Track Geometry Irregularities

Cited by 3 publications

References 16 publications

Influence mechanism of vertical dynamic track irregularity on train operation stability of long-span suspension bridge

Influence mechanism of vertical dynamic track irregularity on train operation stability of long-span suspension bridge

Investigation of Track Gauge and Alignment Parameters of Ballasted Railway Tracks Based on Real Measurements Using Signal Processing Techniques

Connection Between Track Geometry Quality and Dynamic Vehicle Response at Various Speeds

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