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
๐Ÿ‡ฉ๐Ÿ‡ช DIN EN ISO 11821 ๐Ÿ‡ฌ๐Ÿ‡ง BS EN ISO 11821 ๐Ÿ‡ซ๐Ÿ‡ท NF EN ISO 11821 ๐Ÿ‡ฎ๐Ÿ‡น UNI EN ISO 11821 ๐Ÿ‡ช๐Ÿ‡ธ UNE EN ISO 11821 ๐Ÿ‡ณ๐Ÿ‡ฑ NEN EN ISO 11821 ๐Ÿ‡ฉ๐Ÿ‡ช DIN EN ISO 3095 ๐Ÿ‡ฌ๐Ÿ‡ง BS EN ISO 3095 ๐Ÿ‡ซ๐Ÿ‡ท NF EN ISO 3095 ๐Ÿ‡ฎ๐Ÿ‡น UNI EN ISO 3095 ๐Ÿ‡ช๐Ÿ‡ธ UNE EN ISO 3095 ๐Ÿ‡ณ๐Ÿ‡ฑ NEN EN ISO 3095
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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 โ€” In-situ measurement of sound insulation of windows and faรงades
  • EN ISO 3095 Acoustics โ€” Measurement of noise emitted by railbound vehicles
  • ISO 7235 Acoustics โ€” Laboratory measurement of sound absorption coefficient of materials in impedance tubes

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