A joint investigation between the Swedish Transport Administration (infrastructure manager) and passenger train operator SJ AB has been made to analyse whether there is a difference in ride comfort between reprofiling rails by grinding or by milling. The investigation involves long-time measurements of carbody accelerations of four coaches of SJ’s high-speed tilting train, measurements of track geometry quality, rail profiles and wheel profiles.
The carbody accelerations have been analysed by two ride comfort indexes, Wz, sensitive to frequencies 2–9 Hz, and ISO-rms, sensitive to frequencies 0.3–2.5 Hz. The lateral track irregularity quality has been analysed by standard deviation of alignment in domain D1, i.e. with wavelengths 3–25 m. The rail profiles have been analysed by calculating equivalent conicity in combination with measured, worn wheel profiles.
The analysis shows that the ride comfort index Wz is higher for track sections with milled rails compared to track sections with ground rails, i.e. having worse ride comfort. There are, however, differences between the four measured coaches, with one coach having overall better (lower) Wz ride indexes, and no difference between milled and ground sections. The ISO-rms index, which is sensitive to lower frequencies, do not show any difference between the milled and ground rails. The milled rails show in general higher equivalent conicities than the ground rails, which is consistent with giving higher bogie vibrations for susceptible vehicles.
Influence of Ground and Milled Rail Profiles on Ride Comfort
Lect.Notes Mechanical Engineering
The IAVSD International Symposium on Dynamics of Vehicles on Roads and Tracks ; 2021 August 17, 2021 - August 19, 2021
2022-08-06
11 pages
Article/Chapter (Book)
Electronic Resource
English
Infiuence of Ground and Milled Rail Profiles on Ride Comfort
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