May/June 2024 - 20
Vehicle design
Development of an optimized Wheel Profile
(Independent Wheels)
* Determination of contact angle difference
or eliminate hunting, for example. Arne Pfeil, product dynamics
engineer/railways dynamics expert at Alstom, noted
often transit properties commission a study when an aspect
of their system begins to perform out of band, perhaps a new
vehicle is experiencing excessive flange wear or generating
excessive noise.
Regardless of the specific reason for the study, the first
FIGURE 6. Independently rotating wheels require profiles
with contact angles optimized for both curved and
tangent track scenarios.
Image: Alstom
Development of an optimized Wheel Profile
* Select appropriate wheel profile(s) for the entire fleet regarding:
Contact point distribution
FIGURE 7.
Contact patch
distribution
helps spread
wear evenly
across the
running band.
Image: Alstom
step is recording and analyzing the wheel/rail conditions.
Alstom collects wheel and rail profile measurements and
track geometry data and uses the information to determine
an optimized rolling radii difference from the system.
" If you want to run through a curve without any longitudinal
creepage, the outer wheel must have a greater radius
than the inner wheel, " Pfeil said.
For every curve in the system, there is a dedicated optimal
rolling radius difference that does not induce longitudinal
creepage. Of course, there are many different curves in every
system and wheelsets must be able to navigate them all. Pfeil
notes that based on curve distribution, Alstom calculates
the best-fit rolling radius difference and wheel conicity that
will optimize performance and minimize wheel/rail wear.
This process is different for independently rotating wheels,
as they lack an axle to induce longitudinal creepage. However,
this also means they don't have a self-centering effect. In this
case, profile optimization involves adjusting the contact angle
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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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