NOISE & VIBRATION MITIGATION IN RAILWAY TRACK · Low-frequency excitations are difficult to reduce...
Transcript of NOISE & VIBRATION MITIGATION IN RAILWAY TRACK · Low-frequency excitations are difficult to reduce...
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NOISE & VIBRATION MITIGATION IN RAILWAY TRACK
Coenraad EsveldEsveld Consulting Services
Emeritus Professor of Railway Engineering TU Delft
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Noise: Rolling; Engines; Curves; Braking; Aerodynamics.
Vibration: Rayleigh waves (at surface); Compression waves (tunnels); Shear waves (tunnels).
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CLASSIFICATION NOISE ANNOYANCE
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SQUEALING NOISE
Mitigating measures:• Lubrication;• Asymmetric rail grinding, shift of contact point wheel rail.
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CONTRIBUTION OF NOISE SOURCESTotal
Sleeper
Wagon
Rail Wheel
Sleeper
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METHODS OF NOISE REDUCTION Track Design
– Component selection (pads/sleepers)
– Embedded rail/special slabtracks– Damping
Barriers– Up to 10dB but affected by layout
of tracks/buildings– Expensive & visual impact– Low barriers & shrouds: not
interoperable
Acoustic grinding– Effective for corrugation– Not so effective for tracks in good
condition Absorptive Layers
– Low results on the rail– Higher results on slab track -
absorbs wheel noise Vehicle Design
– Wheel diameter– Wheel damping
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ENERGY DISTRIBUTED IN STRESS WAVES:
Rayleigh 67 % Shear 26 % Compression 7 %
GeometricalDamping Law
Vibrating source
Horiz.Comp.
RelativeAmplitude
Shear Wave
ν = 0.25
ShearWindow
GeometricalDamping Law
R-1
++
+ +
+
––
Compression wave
R-1
R-2 R-2 R-0.5
Rayleigh WaveVert.Comp.
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VIBRATION PROPAGATION AT GRADE
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VIBRATION PROPAGATION BY UNDERGROUND
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The human body is susceptible to the following frequencies: 0.1 - 0.2Hz : resonance of the organ of balance, resulting in
phenomena characteristic of seasickness; 4 - 8 Hz: resonance of the contents of abdomen and
thorax; 30 - 80 Hz: resonance of eyes in the eye sockets,
resulting in loss of focus;
The audibility limit lies at a frequency of approximately 20 Hz.
SUSCEPTIBILITY OF HUMAN BODY
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RVES
OF
EQU
ALVI
BRAT
ION
PERC
EPTI
ON
rms2
0.18 fEP v ( f )f1
5.6
= +
peak rmsv 2v=
2a 2 fv ( 2 f ) dπ π= =
102
101
8
5
3
2
8
5
3
2
100
8
5
3
2
10-1
101
100
10-1
5
3
2
8
5
3
2
8
5
3
2
8
Vibr
atio
n ve
loci
ty (r
ms-
valu
e) [m
m/s
]
Vibr
atio
n ve
loci
ty (p
eak
valu
e) [m
m/s
]
EP = equal perception
EP = 25.6
EP = 12.8
EP = 6.4
EP = 3.2
EP = 1.6
EP = 0.8EP = 0.56EP = 0.4
EP = 0.28
EP = 0.2
EP = 0.14
EP = 0.1
521 10 5020 100Frequency f [Hz]
Not noticeable
Very weak
Weak
Good
Strong
Very strong
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CLASSIFICATION OF VIBRATION LEVELS
ISOGERMANYReference v0not standardized LEP [dB] = 20 log10(v/v0), with for instance v0 = 10-8 m/s
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MEASURED VIBRATIONNEAR UNDERGROUND
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EFFECT OF HIGH-SPEED MEASURED AT DB
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mw cw kw F ( t )+ + =
( ) ( ) ( )π
≈
= =
1 kf2 m
K kw f F f H fTransmission Ratio
Mitigating measures:• Reduce force, cq excitation:
grinding, weld straightening;• Change natural frequency relative to
dominant excitation frequency:softer rail pads, resilient layers, …….
VIBRATION TRANSFER
k c
m
w
Fexcitation
Kresponse
10.00
1.00
0.10
0.01 0.1 1.0√2 10.0
f = excitation (impressed) frequency [Hz]f/fn
trans
mis
sion
ratio
|K(f)
/F(f)
|
ζ = 1.0
ζ = 0.5
ζ = 0.2
ζ = 0.1 ζ ζ = 0
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Dom
inan
t exc
itatio
n fre
quen
cy
Natu
ral f
requ
ency
stru
ctur
ef
f
f
1
→X
→=
Excitation spectrum
Transfer function
Response spectrum
VIBRATION TRANSFER II
excit naturalf 2 f>
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Low-frequency excitations are difficult to reduce
1 kf2 mπ
≈
Low stiffness and large mass necessary to achieve low frequency! Not with sleeper and rail pad, but with elastically supported slab.
PRACTICAL LIMITS
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Cork rubberConcrete block
Casting
BLOCK TRACK
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STEDEF
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PANDROL VANGUARD
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WHISPER RAIL THYSSENKRUPP
Vertical up to 10 mm Lateral < 2 mm
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KÖLNER EI
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ELASTIC RAIL SUPPORT
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SA 42 RAIL LOW NOISE -5 dB(A) compared to
ballasted track -7 dB(A) compared to
conventional slab track 60 % less consumption of
corkelast compared to UIC 54
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EMBEDDED RAIL ON STEEL BRIDGE
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SILENT BRIDGE WITH EMBEDDED RAIL
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SILENT BRIDGE VERSUS CONVENTIONAL
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CAST-IN SLEEPER
Ballast
Elastic supported sleeper
Polyurethane
Reinforced concrete
Filler concrete
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TRACK ON ELASTICALLY SUPPORTED SLAB
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GERB Floating Slab Track Systems
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Wege für MenschenUSP – Under Sleeper Pads
UNDER SLEEPER PAD (USP)
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UNDER SLEEPER PADS (USP) Increase of contact area between concrete and ballast (Riessberger): 5-10 % without USP ~ 35 % with USP
Adding resilience and thus reducing dynamic forces Very effective in areas with high impact forces: frog area of turnouts; transitions near engineering structures;
Effective solution at spots with maintenance problems due to poor subgrade;
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CONCLUSIONS Apply mitigating measures preferably at the source: smooth wheel-rail interface; sufficient track resilience;
Reduction of natural frequency: low spring stiffness; large mass;
1 kf2 mπ
≈