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
🇩🇪 DIN EN ISO 11821 🇬🇧 BS EN ISO 11821 🇫🇷 NF EN ISO 11821 🇮🇹 UNI EN ISO 11821 🇪🇸 UNE EN ISO 11821 🇳🇱 NEN EN ISO 11821 🇩🇪 DIN EN ISO 3095 🇬🇧 BS EN ISO 3095 🇫🇷 NF EN ISO 3095 🇮🇹 UNI EN ISO 3095 🇪🇸 UNE EN ISO 3095 🇳🇱 NEN EN ISO 3095
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ZwickRoell

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aescuLabor Hamburg

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amedes MVZ MEDLAB Würzburg

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amedes MVZ für Laboratoriumsdiagnostik und Mikrobiologie

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amedes MVZ für Laboratoriumsdiagnostik und Mikrobiologie Halle/Leipzig

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amedes Medizinisches Versorgungszentrum für Laboratoriumsmedizin und Mikrobiologie

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amedes Medizinisches Versorgungszentrum für Laboratoriumsmedizin, Mikrobiologie und Genetik Hamburg

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anemos Gesellschaft für Umweltmeteorologie

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bactologicum

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biovis Diagnostik MVZ

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esz AG calibration & metrology

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eumetron

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eurofins Umwelt West

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europascal

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DAkkS D-K-15055-01-01 Hanau, DE
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fem-SMS

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DAkkS D-PL-23215-01-01 Schwäbisch Gmünd, DE
DIN EN 12143 ISO 6293-1 DIN 53210 BS ISO 18771 DIN EN 12206-1 + 3 more
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halstrup-walcher

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DAkkS D-K-21048-01-00 Kirchzarten, DE
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i2 FAST

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iKM Service

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iLF Magdeburg

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ifm prover gmbh Sensorik für die Prozeß- und Verfahrenstechnik

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ifp-labs UK West Yorkshire

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UKAS 1916 Hebden Bridge, GB
on BS 4401:Part 3:1970(1986) ISO 12966-1:2014 and ISO 12966-4 CH 4026 based on BS 5766:Part CH 4001 based on BS EN 12014- + 3 more
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ift Rosenheim

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DAkkS D-PL-11349-01-01 Rosenheim, DE
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iki Institut für Krankenhaushygiene und Infektionskontrolle

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DAkkS D-PL-21129-01-03 Gießen, DE
DIN EN ISO 5667-1 (A 4) DIN ISO 5667-5 (A 14) DIN EN ISO 5667-3 (A 21) DIN EN ISO 19458 (K 19) DIN 19643-1 + 3 more
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Industries

Railway rolling stock manufacturing Train maintenance and depot operations Acoustic engineering and noise control HVAC and ventilation system design Brake system suppliers and integrators

Related Standards

  • ISO 11821 Acoustics — In-situ measurement of sound insulation of windows and façades
  • EN ISO 3095 Acoustics — Measurement of noise emitted by railbound vehicles
  • ISO 7235 Acoustics — Laboratory measurement of sound absorption coefficient of materials in impedance tubes

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