Corus Rail Products - i

Corus Rail Products
Sil
Silent
Track™
T k™
Rail a noise red
Railway
reduction
ction ssystem
stem
Mayy 2009
Corus Rail Products - An Introduction
¾ Corus Rail designs,
g , manufactures and
supplies steel rail, sleepers and rail
products and related services such as
welding.
welding
¾ Corus has two rail manufacturing sites,
Scunthorpe UK and Hayange,
Scunthorpe,
Hayange France.
France
¾ Corus products are evident in rail
networks in every continent and Corus has
been supplying products to the rail industry
for over 125 years.
¾Corus is market leader in the supply of
rail dampers, marketed under the brand
name “Silent
“Sil t Track”.
T
k”
Business Development
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Silent Track™ - Introduction
•
Corus Rail’s
Rail s Silent Track developed out of a E
E.U.
U part-funded
part funded research project to reduce
noise generated by railways. On track testing gave up to 6dB(A) noise reduction.
•
Silent Track reduces noise generated by rails as train wheels pass over them. The system
employs patented “tuned dampers” which are attached to either side of the rail.
•
The dampers are designed to suit a particular track-form, and are tailored to meet Clients
size requirements
requirements. They are retro-fitted to existing tracks in-situ by a specifically designed
clip.
•
Dampers can also be pre-attached onto rail at one of our rail mills before the rail is
delivered directly onto track.
track
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SilentTrack™ - How does it work?
Silent Track reduces the noise generated by the rails as train wheels
pass over them.
th
The Tuned Rail Damper System
y absorbs the vibrations
efficiently
from the rail –wheel interface
and prevents noise from being
generated by the rail.
A contact paste is applied
between the rail and the damper
to ensure correct transference
of vibrations.
El
Elastomer
“Springs”
“S i
”
Rail vibration causes the
masses to oscillate.
The energy of movement is
absorbed by the elastomer
material
material.
The Tuned Rail Damper is
q
y band
tuned to the frequency
with the highest noise level.
Steel Masses
SILENT TRACK is a unique
q
2 mass design
g
developed jointly with the University of Southampton
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Rail as a Noise Source
•
Roughness of the rail and the wheel
gives rise to vibration energy from rail
wheel contact
•
50
0 to 5000
000 H
Hz
•
Wheel, rail and sleepers all radiate
•
Modern, elastic tracks leave most of
vibration in rail
•
Vertical modes dominate
•
Vibrating Length of track is important size of source
•
Noise depends on decay of vibration with
distance – the lower the decay rate, the
greater the vibrating length of rail
rail.
1.0E+4
0.E+0
-1.0E+4
-2.0E+4
-3.0E+4
Force
e (N)
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-4.0E+4
-5.0E+4
5
Effect of Damping on Rail Vibration
1.0E+4
•
Decay rate can be increased by the addition of rail
damping
•
This reduces the displacement of the vibration waves
along the rail, and therefore reduces the vibrating
l
length
th off the
th rail,
il and
dh
hence th
the noise
i emitted
itt d
0.E+0
-1.0E+4
-2.0E+4
-3.0E+4
Force
e (N)
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-4.0E+4
Vibration waves
are diminished if
th rail
the
il is
i damped
d
d
-5.0E+4
6
Effect of Tuned Rail Dampers on Decay
Rate
•
The green line shows the increased decay rate on a track fitted with
Silent Track tuned rail dampers, compared with the undamped track
in blue
Tjornap Comparative Decay Rates July 2008
2
10
1
Decay Rate
dB/ t
dB/metre
Decay rate
e (dB/m)
10
0
10
-1
1
10
Reference
Corus Damper
Frequency
q
y Hz
-2
2
10
2
10
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3
10
One third-octave band centre frequency (Hz)
4
10
7
Silent Track™ – Damper design
The design of a damper is a two stage process.
ƒ Firstly, the Clients requirements define the shape of the damper and fixing
method
ƒ Second, the track characteristics enables Corus to design
g the internal
arrangement (steel size and spacing) of the damper to give the most
effective noise reduction
Stage 1 - Clients
St
Cli t requirements
i
t
defining the shape of the damper
Rail type
¾
Profile
Clearance constraints
Stage 2 – Corus
St
C
d
design
i off internal
i t
l arrangementt
to give effective noise reduction
Track measurement to confirm acoustic
characteristics of the track. Factors include:
•
Fastening type (Pandrol fastclip, Vossloh
etc)
•
Pad stiffness (expressed as kN per mm
deflection)
Sleeper type (mono or twin bloc concrete,
steel, timber)
Slab or ballasted track
•
Rail head
¾
height
•
Rail fastening
¾
length
•
Edge of rail foot
foot.
¾
width
•
•
Fixing constraints
•
“removable” damper
¾
Clip-on
•
“permanent” damper
¾
Glue-on
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Computor modelling then used to define most
effective
ff ti steel
t l sizes
i
and
d spacing
i
8
Silent Track™ – Market Development
As of May 09
• Holland – First country with product
approval – Apr 2004. Now installed onto a
total of 35km of track.
Fully approved product
• Germany – Corus dampers in DB track
since June 2006. First large scale projects
currently underway.
Urban Network interested
Trial in progress
Trial proposed
National Networks interested
• Australia – New commuter line, 16km to be
fitted with Corus rail dampers, Sept 09
• France – Product approval
pp
g
granted April
p
2007.
• UK, Network Rail – approval exp. June 09.
First installation planned for late 2009 as
part of Thameslink project.
• Several trials also in progress Sweden (July
08) Austria
08),
A t i (Sept
(S t 08),
08) Finland
Fi l d (Oct
(O t 08)
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Silent Track™ – Summary of Test Results
Country
Track type
Damper
Fixing
Noise Reduction
UIC test
centre
UIC 60, Pandrol E 500mm “continuous”
Cast onto rail Up to 6dB overall
Holland
UIC 54, Vossloh +
500mm “continuous”
hard pad
Glued
Holland
UIC 54, Vossloh + 360mm between sleepers
hard pad
(600mm c/c)
Single sided
3.1 dB overall average
clip
Pierrelatte,
France
UIC 60, Nabla +
hard pad
300mm, between sleepers
(600mm c/c)
“U” Clip
Sweden
UIC 60,
60 Pandrol E
400mm, between sleepers
p
(650mm c/c), low height
Spring clip
2 - 6dB overall (depending
p
g
Germany
UIC 60, Vossloh
360mm between sleepers
((600mm c/c))
Spring clip
3.2 - 4.1dB (overall)
UK
UIC 60, Pandrol
fastclip
360mm between sleepers
(600mm c/c)
Single sided 4.7dB(A) to 6.2dB(A) –
clip
predicted overall
3.0 – 3.4dB overall
5.8dB (rail)
3-4dB (overall)
on train type)
Denmark,
D
k Fi
Finland,
l d C
Czech
hR
Rep - discussions
di
i
underway
d
- awaiting
iti
confirmation of test sites!
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Track maintenance activities
Track where Corus dampers have been fitted can be maintained using normal
machinery.
Rigorous trials have been carried out by the SNCF and ProRail as part of the
product homologation process. The presence of Corus dampers had no effect on
the normal functioning of tamping machines, rail grinders or ballast ploughs.
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Installation developments (1)
Corus works in partnership with Volker Rail to improve rail damper installation
techniques.
Recent changes have been made to the clipping system in order to increase the rate at
which Corus rail dampers can be installed
installed.
¾ Single sided clip design
¾ Mechanised installation requiring
possession
i off single
i l ttrack
k only
l
¾ High speed – target 250 metres/hr
Business Development
9 Reduced possession times
9 Lower overall cost
9 Increased scope for installation
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Installation developments (2)
Volker Rail RDM (Rail Damper Machine) capable of installing dampers
onto 250m of track per hour.
Financial investment in the machine is in the region of € 1 million.
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SilentTrack™ - Advantages
9 Proven system
9 High noise reduction capability - at source.
source
9 Maintenance-free.
9 Can be re-used when rails are changed.
9 No interference with track maintenance operations.
9 Visually unobtrusive (unlike noise barriers!).
barriers!)
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