ISO/TR 17534-4:2020
Acoustics — Software for the calculation of sound outdoors — Part 4: Recommendations for a quality assured implementation of the COMMISSION DIRECTIVE (EU) 2015/996 in software according to ISO 17534-1
This document facilitates a standardized interpretation and a verifiably consistent software implementation of the sound propagation part of the calculation method CNOSSOS-EU:2015 according to ISO 17534-1. Other parts of CNOSSOS-EU:2015, such as the source models or the calculation method for aircraft noise, are beyond the scope of this document. This document provides an agreed interpretation of ambiguous aspects of the sound propagation part of CNOSSOS-EU:2015, a set of illustrative test cases along with reference solutions, and an example of a template form for the declaration of conformity for software manufacturers.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Identification of the official documentation
5 Uniform and agreed interpretation of ambiguities
5.1 General
5.2 Sloping objects
5.3 Equivalent heights
5.4 Alternative statistical approach
5.5 Octave band centre frequency fm
5.6 Ground factor of the source area, GS
5.7 Distances in Figure 2.5.b of CNOSSOS-EU:2015
5.8 Equivalent heights in Equation (2.5.20) of CNOSSOS-EU:2015
5.9 Rayleigh’s Criterion
5.10 Parameter e
5.11 Diffraction under favourable conditions
5.12 Error in Figure 2.5.f and Equation (2.5.29) of CNOSSOS-EU:2015
5.13 Lateral diffraction
5.14 Reflection on nearly vertical objects
5.15 Retrodiffraction
6 Test cases
6.1 General
6.2 Test cases with intermediate and final results
6.2.1 TC01-TC03 — Flat ground with homogeneous acoustic properties
6.2.2 TC01 — Reflecting ground (G = 0)
6.2.3 TC02 — Mixed ground (G = 0,5)
6.2.4 TC03 — Porous ground (G = 1)
6.2.5 TC04 — Flat ground with spatially varying acoustic properties
6.2.6 TC05 — Ground with spatially varying heights and acoustic properties
6.2.7 TC06 — Reduced receiver height to include diffraction in some frequency bands
6.2.8 TC07 — Flat ground with spatially varying acoustic properties and long barrier
6.2.9 TC08 — Flat ground with spatially varying acoustic properties and short barrier
6.2.10 TC09 — Ground with spatially varying heights and and acoustic properties and short barrier
6.2.11 TC10 — Flat ground with homogeneous acoustic properties and cubic building — Receiver at low height
6.2.12 TC11 — Flat ground with homogeneous acoustic properties and cubic object – receiver at large height
6.2.13 TC12 — Flat ground with homogeneous acoustic properties and polygonal object — Receiver at low height
6.2.14 TC13 — Ground with spatially varying heights and acoustic properties and polygonal object
6.2.15 TC14 — Flat ground with homogeneous acoustic properties and polygonal object — Receiver at large height
6.2.16 TC15 — Flat ground with homogeneous acoustic properties and four buildings
6.2.17 TC16 — Reflecting barrier on ground with spatially varying heights and acoustic properties
6.2.18 TC17 — Reflecting barrier on ground with spatially varying heights and acoustic properties — Reduced receiver height
6.2.19 TC18 — Screening and reflecting barrier on ground with spatially varying heights and acoustic properties
6.2.20 TC19 — Complex object and 2 barriers on ground with spatially varying heights and acoustic properties
6.2.21 TC20 — Ground with spatially varying heights and acoustic properties
6.2.22 TC21 — Building on ground with spatially varying heights and acoustic properties
6.2.23 TC22 — Building with receiver backside on ground with spatially varying heights and acoustic properties
6.2.24 TC23 — Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties
6.2.25 TC24 — Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties – receiver position modified
6.2.26 TC25 — Replacement of the earth-berm by a barrier
6.2.27 TC26 — Road source with influence of retrodiffraction
6.2.28 TC27 — Source located in flat cut with retro-diffraction
6.2.29 TC28 — Propagation over a large distance with many buildings between source and receiver
6.3 Summary of the final results
7 Example of a template form for the declaration of conformity
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Identification of the official documentation
5 Uniform and agreed interpretation of ambiguities
5.1 General
5.2 Sloping objects
5.3 Equivalent heights
5.4 Alternative statistical approach
5.5 Octave band centre frequency fm
5.6 Ground factor of the source area, GS
5.7 Distances in Figure 2.5.b of CNOSSOS-EU:2015
5.8 Equivalent heights in Equation (2.5.20) of CNOSSOS-EU:2015
5.9 Rayleigh’s Criterion
5.10 Parameter e
5.11 Diffraction under favourable conditions
5.12 Error in Figure 2.5.f and Equation (2.5.29) of CNOSSOS-EU:2015
5.13 Lateral diffraction
5.14 Reflection on nearly vertical objects
5.15 Retrodiffraction
6 Test cases
6.1 General
6.2 Test cases with intermediate and final results
6.2.1 TC01-TC03 — Flat ground with homogeneous acoustic properties
6.2.2 TC01 — Reflecting ground (G = 0)
6.2.3 TC02 — Mixed ground (G = 0,5)
6.2.4 TC03 — Porous ground (G = 1)
6.2.5 TC04 — Flat ground with spatially varying acoustic properties
6.2.6 TC05 — Ground with spatially varying heights and acoustic properties
6.2.7 TC06 — Reduced receiver height to include diffraction in some frequency bands
6.2.8 TC07 — Flat ground with spatially varying acoustic properties and long barrier
6.2.9 TC08 — Flat ground with spatially varying acoustic properties and short barrier
6.2.10 TC09 — Ground with spatially varying heights and and acoustic properties and short barrier
6.2.11 TC10 — Flat ground with homogeneous acoustic properties and cubic building — Receiver at low height
6.2.12 TC11 — Flat ground with homogeneous acoustic properties and cubic object – receiver at large height
6.2.13 TC12 — Flat ground with homogeneous acoustic properties and polygonal object — Receiver at low height
6.2.14 TC13 — Ground with spatially varying heights and acoustic properties and polygonal object
6.2.15 TC14 — Flat ground with homogeneous acoustic properties and polygonal object — Receiver at large height
6.2.16 TC15 — Flat ground with homogeneous acoustic properties and four buildings
6.2.17 TC16 — Reflecting barrier on ground with spatially varying heights and acoustic properties
6.2.18 TC17 — Reflecting barrier on ground with spatially varying heights and acoustic properties — Reduced receiver height
6.2.19 TC18 — Screening and reflecting barrier on ground with spatially varying heights and acoustic properties
6.2.20 TC19 — Complex object and 2 barriers on ground with spatially varying heights and acoustic properties
6.2.21 TC20 — Ground with spatially varying heights and acoustic properties
6.2.22 TC21 — Building on ground with spatially varying heights and acoustic properties
6.2.23 TC22 — Building with receiver backside on ground with spatially varying heights and acoustic properties
6.2.24 TC23 — Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties
6.2.25 TC24 — Two buildings behind an earth-berm on flat ground with homogeneous acoustic properties – receiver position modified
6.2.26 TC25 — Replacement of the earth-berm by a barrier
6.2.27 TC26 — Road source with influence of retrodiffraction
6.2.28 TC27 — Source located in flat cut with retro-diffraction
6.2.29 TC28 — Propagation over a large distance with many buildings between source and receiver
6.3 Summary of the final results
7 Example of a template form for the declaration of conformity
Bibliography