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BS ISO 9613-2:2024 Acoustics. Attenuation of sound during propagation outdoors - Engineering method for the prediction of sound pressure levels outdoors, 2024
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and units [Go to Page]
- 3.1 Terms and definitions
- 3.2 Symbols and units
- 4 Source description
- 5 Meteorological conditions
- 6 Basic formulae
- 7 Calculation of the attenuation terms [Go to Page]
- 7.1 Geometric divergence, Adiv
- 7.2 Atmospheric absorption, Aatm
- 7.3 Ground attenuation, Agr [Go to Page]
- 7.3.1 General method of calculation
- 7.3.2 Simplified method of calculation for A-weighted sound pressure levels
- 7.4 Screening, Abar [Go to Page]
- 7.4.1 General method of calculation
- 7.4.2 Alternative method to calculate the path length difference z with one edge or with more parallel edges
- 7.4.3 Lateral diffraction around vertical edges
- 7.4.4 Combining vertical and lateral diffractions and limitations
- 7.5 Reflections [Go to Page]
- 7.5.1 General
- 7.5.2 Single reflection at a flat surface – conditions and calculation
- 7.5.3 Multi-reflection up to higher orders
- 7.5.4 Reflections at cylindrical surfaces
- 8 Meteorological correction, Cmet
- 9 Accuracy and limitations of the method
- Annex A (informative) Additional types of attenuation, Amisc
- Annex B (informative) Directivity correction, Dc, for chimney stacks
- Annex C (informative) Meteorological correction due to the dependency of C0 from the angular wind distribution
- Annex D (informative) Calculation of sound pressure levels caused by wind turbines
- Bibliography [Go to Page]