By modifying friction to the desired level,the application of friction modifiers(FMs)has been consid-ered as a promising emerging tool in the railway engineer-ing for increasing braking/traction force in poor adhesion conditions and mitigating wheel/rail interface deterioration,energy consumption,vibration and noise.Understanding the effectiveness of FMs in wheel-rail dynamic interactions is crucial to their proper applications in practice,which has,however,not been well explained.This study experimentally investigates the effects of two types of top-of-rail FM,i.e.FM-A and FM-B,and their application dosages on wheel-rail dynamic interactions with a range of angles of attack(AoAs)using an innovative well-controlled V-track test rig.The tested FMs have been used to provide intermediate fric-tion for wear and noise reduction.The effectiveness of the FMs is assessed in terms of the wheel-rail adhesion char-acteristics and friction rolling induced axle box accelera-tion(ABA).This study provides the following new insights into the study of FM:the applications of the tested FMs can both reduce the wheel-rail adhesion level and change the negative friction characteristic to positive;stick-slip can be generated in the V-Track and eliminated by FM-A but intensified by FM-B,depending on the dosage of the FMs applied;the negative friction characteristic is not a must for stick-slip;the increase in ABA with AoA is insignificant until stick-slip occurs and the ABA can thus be influenced by the applications of FM.

Zhen Yang;Pan Zhang;Jan Moraal;Zili Li

Section of Railway Engineering,Delft University of Technology,Stevinweg 1,2628 CN Delft,The Netherlands

铁道工程科学（英文）

[1]Zhen Yang;Pan Zhang;Jan Moraal;Zili Li-.An experimental study on the effects of friction modifiers on wheel-rail dynamic interactions with various angles of attack)[J].铁道工程科学（英文）,2022(03):360-382

AoAs,accelera

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