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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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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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
1,516
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17
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ISO 16063-21
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UNE 73311-5
ISO 11665-4
UNE 31010
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IEC 61000-4-13: 2002
DIN EN 50121-3-2
IEC 61000-3-2: 2014
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DIN EN 1656
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IEC 60127-6
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CEM ME-003
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Ground-borne noise and vibration from ra
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DIN EN ISO 1833-6
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ITS Testing Services (UK)
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BS EN ISO 1833-1:2020
And the following parts of ISO 1833
ISO 1833-4:2017/EU Reg. method 2ISO 1833
ISO 1833-3: 2019
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ASTM D 5443
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Taupunkttemperatur
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Railway vehicle body structural requirem
Railway bogies — wheelsets and bogies st
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ISO 22262-1
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ISO 22262-1
NF X 43-050
NF X 43-269 –
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