May/June 2024 - 21
of the wheel. According to Pfeil, increasing the contact angle
as the wheel moves toward the flange results in higher lateral
forces aimed at preventing flange contact while the wheel is
running in tangent track.
Like Siemens and Stadler, Alstom also uses multibody
simulations throughout the profile design process to model
wear patterns, potential development of two-point contact
and the propensity for corrugation to develop, Pfeil said.
This allows for the testing of multiple profiles with a level of
specificity and granularity not possible in the field, he added.
On the track side, rail reprofiling and transition to one (or
more) standard rail profiles typically starts by grinding to a
transitional profile and then to the target profile. " The goal
is to achieve the target profile as part of the regular grinding
program, which is gradual, but more economical, " Pfeil said.
Concurrently, intermediate wheel profiles can be designed to
better match the reprofiled and non-reprofiled rail conditions.
Once the track has fully transitioned into the standard profile
(or profiles), multiple wheel profiles can be developed that
match the rail and distribute wear more uniformly, in that
each profile is designed to contact the rail at a different point.
The process of optimizing wheel and rail profiles is also
beneficial in that it feeds back into the new vehicle procurement
process when the time arises. The data collected
during the process can be used by car builders to further
optimize their designs, as Siemens'
Kevin McClain pointed out. Knowing
the operating parameters of the track/
wheel/rail system means that a vehicle
designed for that system can be more
specialized and better able to target
customer specifications, rather than
account for a broad range of sub-optimal
operating conditions.
The vehicle procurement and design
process touches on nearly every discipline
and principle in the rail transit
industry. Optimizing performance
while minimizing noise and vibration
is a process that starts at the vehicle
specification and never really ends.
The throughline is the importance of
good data, thorough analysis, reliable
simulation and a holistic approach to
vehicle/track interaction.
About the author
Jeff Tuzik is managing editor of Interface
Journal (www.interfacejournal.com).
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May/June 2024
Table of Contents for the Digital Edition of May/June 2024
Editor’s Notebook
People & Places
Rep. Blumenauer led a movement of connection and choice
2024 Trends in Passenger Rail
Vehicle Design: Managing Noise and Vibration from the Ground Up
Transit Cybersecurity and Threat and Vulnerability Assessments, Public Transit Risk Assessment Methodology
Government of Ontario’s One Fare program sees early success
CUTRIC continues steps towards cleaner transit and community
Products
May/June 2024 - 1
May/June 2024 - 2
May/June 2024 - 3
May/June 2024 - 4
May/June 2024 - 5
May/June 2024 - Editor’s Notebook
May/June 2024 - 7
May/June 2024 - People & Places
May/June 2024 - 9
May/June 2024 - Rep. Blumenauer led a movement of connection and choice
May/June 2024 - 11
May/June 2024 - 2024 Trends in Passenger Rail
May/June 2024 - 13
May/June 2024 - 14
May/June 2024 - 15
May/June 2024 - Vehicle Design: Managing Noise and Vibration from the Ground Up
May/June 2024 - 17
May/June 2024 - 18
May/June 2024 - 19
May/June 2024 - 20
May/June 2024 - 21
May/June 2024 - Transit Cybersecurity and Threat and Vulnerability Assessments, Public Transit Risk Assessment Methodology
May/June 2024 - 23
May/June 2024 - 24
May/June 2024 - 25
May/June 2024 - Government of Ontario’s One Fare program sees early success
May/June 2024 - 27
May/June 2024 - 28
May/June 2024 - 29
May/June 2024 - CUTRIC continues steps towards cleaner transit and community
May/June 2024 - 31
May/June 2024 - 32
May/June 2024 - Products
May/June 2024 - 34
May/June 2024 - 35
May/June 2024 - 36
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