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Railway Noise

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The structure of a railway consists of train, track and roadbed. Noise sources include ... body vibration of a train. the structure on the ground. The rolling noise ... – PowerPoint PPT presentation

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Title: Railway Noise


1
Railway Noise
2
Noise sources
  • The structure of a railway consists of train,
    track and roadbed.
  • Noise sources include
  • rolling noise
  • engine noise
  • body vibration of a train
  • the structure on the ground
  • The rolling noise
  • generated from the interaction between the wheel
    and rail.

3
Noise sources
  • There is a wide range of parameters affecting the
    noise level of the railway system
  • types of locomotive propulsion system
  • the auxiliary equipment such as compressors,
    motor generators, brakes etc.
  • the interaction of the wheels and rails
  • the noise radiated by vibrating structure such as
    steel bridges, the speed of train and its length.
  • The generated airborne noise radiated into
    community, also ground borne noise and vibration
    which travels through the track, support
    structure and the intervening soil to nearby
    buildings.

4
6 steps of prediction for railway noise
  • Divide the railway into one or more segments such
    that the variation of noise within the track
    segment is less than 2 dB(A)
  • The reference SEL (sound exposure level) at a
    given speed and at a distance of 25 m from the
    near-side railhead of the track segment taking
    into account the length of the train and the type
    of track and track support system.
  • Corrections to SEL for distance of the reception
    point from the track, ground and air absorption,
    the effect of screening by barriers, speed of the
    trains and the angle of view at the reception
    point etc.

Calculation of Railway Noise (CRN) is developed
by the U.K. Department of Transport and the
Transportation.
5
6 steps of prediction for railway noise
  • Corrections to SEL to take account of reflection
    effects at the reception point.
  • The SEL at the reception point by applying the
    corrections determined at stage 3 and 4 to the
    SEL ref, and convert the resulting SEL values to
    values of Leq taking into account the time period
    required and the number of trains.
  • Combine the Leq for each segment to obtain the
    total Leq 30mins.

6
Regulation
  • For the noise assessment, the authorities should
    follow Technical memorandum for the assessment
    of noise from places other than domestic
    premises, public places or construction sites".

7
How to determine acceptable noise level?
8
  • the purpose of table, the following definitions
    apply
  • Country park means an area that is designed as
    a country park pursuant to section 14 of the
    Country Parks Ordinance
  • Directly affected means that the NSR is at such
    a location that noise generated by the IF is
    readily noticeable at the NSR and is a dominant
    feature of the noise climate of the NSR
  • Indirectly affected means that the NSR, is not
    a dominant feature of the noise climate of the
    NSR
  • not affected means that the NSR is at such a
    location that noise generated by the IF is not
    noticeable at the NSR

9
Major railways in Hong Kong
  • Kowloon Canton Railway (KCR)
  • East Rail
  • Ma On Shan Rail
  • West Rail
  • Mass Transit Railway (MTR)
  • Tsuen Wan Line
  • Kwun Tong Line
  • Island Line
  • Tseung Kwan O Line
  • Tung Chung Disney Resort Line
  • Airport Express Line

10
KCRCs present and future railway networks
11
MTR Rail network
12
Controls
  • Skirt (outdated)
  • Wheel absorber
  • Vibration absorbing rail fastener
  • Elastic sleeper pad and rubber boot
  • Insulation mat and rail
  • Sound and vibration absorptive viaduct
  • Noise enclosure at points and crossings
  • Floating slab

13
(No Transcript)
14
Wheel absorber to reduce squeal noise
15
Wheel absorber to reduce rolling and squeal noise
16
Insulator for Light Rail
17
Base Plate Pad
18
Elastic sleeper pad and rubber boot
19
Insulation mat
20
Type of trains in Hong Kong
21
Major control measures used in the Rail
  • 1.2 m to 4.2 m high noise barriers along viaducts
  • Noise enclosures at points and crossings
  • Floating track slabs supported by rubber pads
  • Vibration absorbing rail fasteners

22
Control used in Rail
23
Rail Sound Absorptive Viaduct
24
Absorptive barrier at Kowloon Tong
25
Installation of floating stab at MTRs Airport
Rail Link
26
Translucent noise barrier at the MTRs Airport
Rail Link
27
Reference
  • Calculation of Railway Noise
  • Technical memorandum for the assessment of noise
    from places other than domestic premises, public
    places or construction sites, HKEPD
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