EN 1793-6-2018 en Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 6 Intrinsic characteristics - In situ values of airborne sound i.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Road traffic noise reducing devices Test method for determining the acoustic performancePart 6: Intrinsic characteristics In situ values of airborne sound insulation under direct sound field conditionsBS EN 17936:2018Na

2、tional forewordThis British Standard is the UK implementation of EN 17936:2018. It supersedes BS EN 17936:2012, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/509/6, Fences for the attenuation of noise.A list of organizations represented on this com

3、mittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 95132 9ICS 17.14

4、0.30; 93.080.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN

5、 17936:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 17936June 2018ICS 17.140.30; 93.080.30 Supersedes EN 17936:2012EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref.

6、 No. EN 17936:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersRoad traffic noise reducing devices Test method for determining the acoustic performance Part 6: Intrinsic characteristics In situ values of airborne sound insulation under direct

7、sound field conditionsDispositifs de rduction du bruit du trafic routier Mthode dessai pour la dtermination de la performance acoustique Partie 6 : Caractristiques intrinsques Valeurs in situ disolation aux bruits ariens dans des conditions de champ acoustique directLrmschutzvorrichtungen an Straen

8、Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 6: Produktspezifische Merkmale InsituWerte der Luftschalldmmung in gerichteten SchallfeldernThis European Standard was approved by CEN on 19 February 2018.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which

9、stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the CENCENELEC Management Centre or to any CEN member.This European

10、Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.CEN members are the

11、national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,

12、 Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN 1793-6:2018 (E)European foreword iiiIntroduction iv1 Scope . 62 Normative references 63 Terms and definitions . 64 Sound insulation index measurements .114.1 General principle 114.2 Measured quantity

13、 114.3 Test arrangement . 114.4 Measuring equipment 174.4.1 Components of the measuring system .174.4.2 Sound source 174.4.3 Test signal . 174.5 Data processing . 184.5.1 Calibration 184.5.2 Sample rate 184.5.3 Background noise .194.5.4 Scanning technique using a single microphone .194.5.5 Scanning

14、technique using nine microphones 194.5.6 Adrienne temporal window 204.5.7 Placement of the Adrienne temporal window 214.5.8 Low frequency limit and sample size 224.6 Positioning of the measuring equipment 234.6.1 Selection of the measurement positions 234.6.2 Post measurements 244.6.3 Additional mea

15、surements . 244.6.4 Reflecting objects .244.6.5 Safety considerations 244.7 Sample surface and meteorological conditions . 244.7.1 Condition of the sample surface 244.7.2 Wind 254.7.3 Air temperature .254.8 Singlenumber rating 254.8.1 General. 254.8.2 Acoustic elements 254.8.3 Posts . 264.8.4 Global

16、 265 Measurement uncertainty .266 Measuring procedure .277 Test report 27Annex A (informative) Categorization of single-number rating .29Annex B (informative) Guidance note on use of the single-number rating .30Annex C (informative) Measurement uncertainty .31Annex D (informative) Template of test r

17、eport on airborne sound insulation of road traffic noise reducing devices 34Bibliography .45iiContents PageBS EN 17936:2018EN 1793-6:2018 (E)European forewordThis document (EN 1793-6:2018) has been prepared by Technical Committee CEN/TC 226 “Road equipment”, the secretariat of which is held by AFNOR

18、.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2018, and conflicting national standards shall be withdrawn at the latest by December 2018.Attention is drawn to the possibility that some

19、 of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes EN 17936:2012.With respect to the superseded document, the following changes have been made: an improved definition of the t

20、est signal and considerations about the Signal to Noise (S/N) ratio; clarification on the calculation of single number ratings for qualification purposes and other purposes; the categories of single number rating have been removed from Annex A; the performance of the noise reducing device is, from n

21、ow on, only to be reported in terms of the numeric values of the single number rating; revised information on the determination of measurement uncertainty.EN 1793-6 is part of a series of documents and will be read in conjunction with the following: EN 17931, Road traffic noise reducing devices Test

22、 method for determining the acoustic performance Part 1: Intrinsic characteristics of sound absorption under diffuse sound field conditions; EN 17932, Road traffic noise reducing devices Test method for determining the acoustic performance - Part 2: Intrinsic characteristics of airborne sound insula

23、tion under diffuse sound field conditions; EN 17933, Road traffic noise reducing devices Test method for determining the acoustic performance Part 3: Normalized traffic noise spectrum; EN 17934, Road traffic noise reducing devices Test method for determining the acoustic performance Part 4: Intrinsi

24、c characteristics In situ values of sound diffraction; EN 17935, Road traffic noise reducing devices Test method for determining the acoustic performance Part 5: Intrinsic characteristics In situ values of sound reflection under direct sound field conditions.This European Standard has been prepared,

25、 under the direction of Technical Committee CEN/TC 226 “Road equipment”, by Working Group 6 “Noise reducing devices”.According to the CENCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulg

26、aria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzer

27、land, Turkey and the United Kingdom.iiiBS EN 17936:2018EN 1793-6:2018 (E)IntroductionNoise reducing devices alongside roads should provide adequate sound insulation so that sound transmitted through the device is not significant compared with the sound diffracted over the top. This document specifie

28、s a test method for assessing the intrinsic airborne sound insulation performance for noise reducing devices designed for roads in nonreverberant conditions. It can be applied in situ, i.e. where the noise reducing devices are installed. The method can be applied without damaging the surface of the

29、noise reducing device.The method can be used to qualify products to be installed along roads as well as to verify the compliance of installed noise reducing devices to design specifications. Regular application of the method can be used to verify the long term performance of noise reducing devices.T

30、he method requires the averaging of results of measurements taken at different points behind the device under test. The method is able to investigate flat and non-flat products.The method uses the same principles and equipment for measuring sound reflection (see EN 1793-5) and airborne sound insulat

31、ion (the present document).The measurement results of this method for airborne sound insulation are comparable but not identical with the results of the EN 17932 method, mainly because the present method uses a directional sound field, while the EN 1793-2 method assumes a diffuse sound field (where

32、all angles of incidence are equally probable). Research studies suggest that good correlation exists between laboratory data, measured according to EN 1793-2 and field data, measured according to the method described in the present document 4, 5, 6, 7, 15.The test method described in this document s

33、hould not be used to determine the intrinsic characteristics of airborne sound insulation for noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.For the purpose of this document, reverberant conditions are defined based on the geome

34、tric envelope, e, across the road formed by the barriers, trench sides or buildings (the envelope does not include the road surface) as shown by the dashed lines in Figure 1. Conditions are defined as being reverberant when the percentage of open space in the envelope is less than or equal to 25 %,

35、i.e. reverberant conditions occur when w/e 0,25, where e = (w+h1+h2).This document introduces a specific quantity, called sound insulation index, to define the airborne sound insulation of a noise reducing device. This quantity should not be confused with the sound reduction index used in building a

36、coustics, sometimes also called transmission loss.NOTE This method can be used to qualify noise reducing devices for other applications, e.g. to be installed nearby industrial sites. In this case, the singlenumber ratings can preferably be calculated using an appropriate spectrum.ivBS EN 17936:2018E

37、N 1793-6:2018 (E)a) Partial cover on both sides of the road; b) Partial cover on one side of the road;envelope, e = w+h1+h2envelope, e = w+h1c) Deep trench; d) Tall barriers or buildings;envelope, e = w+h1+h2envelope, e = w+h1+h2Keyr road surfacew width of open spaceh1Developed length of element, e.

38、g. cover, trench side, barrier or buildingh2Developed length of element, e.g. cover, trench side, barrier or buildingNOTE Figure 1 is not to scale.Figure 1 Sketch of the reverberant condition check in four casesvBS EN 17936:2018EN 1793-6:2018 (E)1 ScopeThis document describes a test method for measu

39、ring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.The test method is intended for the following applications: determination of the intrinsic characteristics of airborne sound insulation of noise

40、 reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions; determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use; comparison of design specifications with actual performance data afte

41、r the completion of the construction work; verification of the long term performance of noise reducing devices (with a repeated application of the method); interactive design process of new products, including the formulation of installation manuals.The test method is not intended for the determinat

42、ion of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.Results are expressed as a function of frequency in onethird octave bands, where possible, between 100 Hz and 5

43、kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.2 Normative referencesThe following documents are referred to in the text in

44、 such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 17933, Road traffic noise reducing devices - Test

45、 method for determining the acoustic performance Part 3: Normalized traffic noise spectrumEN 616721, Electroacoustics Sound level meters Part 1: Specifications (IEC 61672 1)ISO/IEC Guide 983, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)3 Terms a

46、nd definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/

47、www.iso.org/obp3.1noise reducing devicedevice that is designed to reduce the propagation of traffic noise away from the road environmentNote 1 to entry: This may be a noise barrier, cladding, a road cover or an added device. These devices may include both acoustic and structural elements.6 BS EN 179

48、36:2018EN 1793-6:2018 (E)3.2acoustical elementelement whose primary function is to provide the acoustic performance of the device3.3structural elementelement whose primary function is to support or hold in place acoustic elements3.4sound insulation indexresult of airborne sound insulation test descr

49、ibed by Formula (1)3.5reference heightheight hSequal to half the height, hB, of the noise reducing device under test: hS= hB/2 (see Figures 2 and 3)Note 1 to entry: When the height of the device under test is greater than 4 m and, for practical reasons, it is not advisable to have a height of the source hS= hB/2, it is possible to have hS= 2 m, accepting the corresponding low frequency limitation (see 4.5.8).3.6source reference planeplane facing the sound sour