Effect of Control Measures on Wheel/Rail Noise When the Vehicle Curves

Han, Junyu; He, Yong; Xiao, Xinbiao; Sheng, Xiaozhen; Zhao, Guotang; Jin, Xuesong

doi:10.3390/app7111144

Cited by 8 publications

(1 citation statement)

References 31 publications

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“…The positive and negative detection signals have no relation to each other. Moreover, the signal from the wheel detector contains unwanted components and noise [11][12][13] that should be removed safely. There are well known approaches for smoothing (filtering) various signals [14].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Filtering Methods for Enhanced Reliability of a Train Axle Counter System

Grzechca

Szczeponik

2020

Sensors

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This paper presents signal filtering methods that can be effectively applied to train detection systems based on the axle counter systems that are currently in operation for train detection and provide information on the unoccupied status of railway tracks and turnouts. Signals from the wheel detectors contain noise, may be impulsive and time-varying, which means that even for the same train, the signals from the following wheels may be different. A problem appears when already homologated hardware (axle counter system) is working in a harsh environment, exposed to disturbances whose parameters significantly exceed standard thresholds. Despite this, the system must continue to provide reliable information. The authors present research on the application of such filters as median, Savitzkey-Golay, and moving average which can be implemented in the equipment currently in use under specific constraints (e.g., limited computational resources). The research results show that appropriately adjusted filters, for example, in terms of type and window size, increase the signal quality and thereby provide reliable information about passing trains, as well as enhance the availability and safety of the axle counter system performance.

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Section: Introductionmentioning

confidence: 99%

Comparison of Filtering Methods for Enhanced Reliability of a Train Axle Counter System

Grzechca

Szczeponik

2020

Sensors

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Assessing the Performance of TOR Lubricants in Humid Environments and Under Dew Conditions

Skurka,

Galas,

Omasta

et al. 2024

Tribol Lett

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Top-of-rail (TOR) lubricants are commonly used for friction control in railway operations. They aim to lower friction and reduce noise and wear while ensuring sufficient transmission of traction/braking forces. However, the wheel–rail interface is an open system, so the conditions may suddenly change due to the weather, and different contaminants may enter the contact and influence the performance of these lubricants. Thus, this study examined the effect of humidity and dew on two commercial products, as these conditions often occur on the track. A methodology based on a creep curves measurement approach was used to assess product performance under various scenarios. All measurements were conducted on a universal tribometer in the ball-on-disc configuration covered with a climate chamber. The results show a strong influence of dew on the tested products, as dew lowered their performance parameters and caused low adhesion problems. Possible mechanisms of water–oil interaction and formation of oxidic third body layers were discussed. The main findings indicate that TOR lubricants may cause traction/braking problems if used in dew conditions. The present study may be helpful in optimising friction management methods in the future. Graphical Abstract

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