Scope
ISO 11820:2019
In-Situ Sound Attenuation Measurement of Silencers
ISO 11820 specifies the in-situ measurement method for determining the acoustic attenuation performance of silencers installed in railway ventilation ducts, brake systems, and exhaust lines. This test is critical for validating noise control equipment on operating trains and stationary installations where laboratory testing is impractical. Railway manufacturers, maintenance operators, and acoustic engineers use these measurements to verify compliance with noise regulations and to optimize silencer design. Accreditation ensures that attenuation claims are reliable and that performance targets for noise reduction are consistently achieved in real-world applications.
What it measures
- Sound pressure level reduction across silencer (dB)
- Attenuation performance by frequency band
- Insertion loss of silencer in situ
- Acoustic performance under operating conditions
- Noise transmission loss through silencer element
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NBN EN ISO 11821
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DIN EN ISO 11821
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BS EN ISO 11821
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NF EN ISO 11821
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UNI EN ISO 11821
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UNE EN ISO 11821
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NEN EN ISO 11821
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NBN EN ISO 3095
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DIN EN ISO 3095
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BS EN ISO 3095
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-95 kPa ≤ P < -1 kPa -1 kPa ≤ P < -100 P
5 kPa ≤ P < 80 kPa 80 kPa ≤ P ≤ 120 kPa
0 MPa ≤ P ≤ 2 MPa 2 MPa < P ≤ 20 MPa 20
Punto triple del agua (0,01 °C)
Punto de fusión del hielo (0,00 °C) -80
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UNE-EN 933-1
UNE-EN 1097-2
UNE-EN 933-3
UNE-EN 50367
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DIN EN 12566-7
ISO 20236
on ISO 11905-2:1997
on BS ISO 17289:2014
ISO 1841-2
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ISO 4832
ISO 21527-1
ISO 21527-2
DIN EN ISO 6579-1
ISO 7251
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Tensile testing of metallic materials (I
ISO 4831
ISO 4832
ISO 15214
ISO 21527-1
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Railway wheel-rail interaction — roughne
ISO 5667-11
ISO 11423-1
ISO 5667-4
ISO 5667-10
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AGRUPA LABORATORIO, S.L.L.
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Railway passenger ride comfort evaluatio
ISO 5667-11
ISO 5667-4
ISO 5667-10
ISO 15705
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AGÉNCIA CATALANA DE L´AIGUA
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ISO 7150-1
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ISO 6878
ASTM E1077-14(2021)
ISO 20595
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DIN EN 60529
IEC 60529: 1989
IEC 60068-2-1
IEC 60068-2-2
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AIRGRUP
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Tensile testing of metallic materials (I
ASTM E 8
ISO 6507-1
BS EN ISO 9015-1:2011
BS EN ISO 9015-2
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Salt spray / neutral salt fog test (ISO
Radiated emissions (CISPR 32)
Railway braking — thermal analysis (EN 1
Influenza A/H1-2009
DIN EN 50155
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APAVE INSPECTION SPAIN
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ÖNORM EN ISO 5579
ÖNORM EN ISO 17640
BS EN ISO 5817:2023
BS ISO 9096:2017
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ASTM D2240-15
CEM DI-012
CEM DI-008
CEM DI-021
CEM DI-005
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Railway wheel-rail interaction — roughne
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ISO 5667-11
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ARGANO ASESORES
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Railway wheel-rail interaction — roughne
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UNE-EN ISO 16911-1
UNE-EN 15058
UNE-EN 14792
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CEM TH-007
EURAMET cg-18
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DIN EN 14809
DIN EN 13274-8
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(NM_001718: c.1-c.500)
DIN EN 62717
DIN EN ISO 80601-2-72
DIN 51130
ISO 8124-3
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Sound power — engineering method using a
Mechanical mounting of accelerometers (I
Railway brake — anti-slide device (UIC 5
Railway vehicle dynamics — on-track test
> 140
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ISO 6486-1
ISO 7086-1
UNE-EN ISO 10545-2
UNE-EN ISO 10545-3
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0 mV ≤ U < 200 mV 0,2 V ≤ U < 2 V 2 V ≤
1 mV ≤ U < 220 mV 0,22 V ≤ U < 2,2 V 2,2
0 mV ≤ U ≤ 100 mV 0,1 V < U ≤ 1 V 1 V <
0 μA ≤ I < 200 μA 0,2 mA ≤ I < 2 mA 2 mA
0 μA ≤ I < 220 μA 0,22 mA ≤ I < 2,2 mA 2
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DIN 4772:1979
DIN EN 14538
DIN EN 50130-4: 2015
DIN EN 1926
DIN EN 12372
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IEC 61400-50-2
IEC 61400-12-2
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DIN EN ISO 11737-2
ISO 16649-2
BS EN ISO 11737-1:2018
UNE-EN ISO 4833-1
UNE-EN ISO 7027-1
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