Wheel profiles for freight wagons in Sweden

Projekt:

Hjulprofil för godsvagnar i Sverige

Sammanfattning:
"Hjulprofil för godsvagnar i Sverige - Wheel profiles for freight wagons in Sweden” is a project funded by Trafikverket with the collaboration of Green Cargo AB (GC), Tikab Strukturmekanik AB (Tikab) and Kockums AB. The most commonly used wheel profile for freight vehicles in Sweden is the S1002, which came out from the investigations of the ORE Working Group in the early 70s. This profile is not a de facto standard and some countries are using their own modified profiles adapting better to their own conditions. S1002 was designed for a rail inclination of 1:40, which differs from the Swedish rail inclination of 1:30 and leads to unfavourable contact conditions between wheel and rail that may cause additional wear on both elements as:
• The radial steering capability can be significantly deteriorated, even completely absent in particular cases.
• Has initial high wear of rails and wheel flange.
Moreover, normal and tangential tensions in the wheel-rail contact area significantly contribute to the emergence of different types of surface damage both on wheels and rails. Therefore it is desirable to reduce contact stresses, which can be particularly difficult for the increased axle loads of freight vehicles. The contact geometry can also generate the so-called low-frequency hunting instability on tangent track or large radius curves, which leads to decreased comfort and increased track forces. The objectives of the project were defined in the original project plan as follows:
• To reduce the maintenance cost of the wheels and rails (wear, track degradation and rolling contact fatigue) by optimizing wheel profiles.
• Explore how the new running gear and traffic arrangements for freight vehicles with increased axle loads and higher speeds generate different requirements for wheel profiles.
• Modify wheel or rail profile so that hunting stability is reduced for Swedish wagons.
The results of the project will lead to a longer wheel life in freight traffic.

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Författare: CARLOS CASANUEVA
Utgivare: KTH
Utgivningsdatum: 2012
Diarienummer: TRV 2010/92154
Antal sidor: 83
Språk: Engelska
Kontaktperson: Martin Li, UHtsp1