EN 1793-6-2012 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

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationRoad traffic noise reducingdevices Test method for determining the acoustic performancePart 6: Intrinsic characteristics In situ values of airborne sound insulation under direct

2、sound field conditionsBS EN 1793-6:2012National forewordThis British Standard is the UK implementation of EN 1793-6:2012.The UK participation in its preparation was entrusted by Technical CommitteeB/509, Road equipment, to Subcommittee B/509/6, Fences for the attenuation of noise.A list of organizat

3、ions represented on this committee 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 2012.Published by BSI Standards Limited 2012 IS

4、BN 978 0 580 71105 3 ICS 17.140.30; 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 30 November 2012.Amendments issued since publicationDate Text affect

5、edBRITISH STANDARDBS EN 1793-6:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1793-6 November 2012 ICS 17.140.30; 93.080.30 English Version Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 6: Intrinsic characteristics - In situ values of air

6、borne sound insulation under direct sound field conditions Dispositifs 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 acoustiq

7、ue direct Lrmschutzvorrichtungen an Straen - Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 6: Produktspezifische Merkmale - In-situ-Werte der Luftschalldmmung in gerichteten Schallfeldern This European Standard was approved by CEN on 29 September 2012. CEN members are bound to com

8、ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELE

9、C Management Centre or to any CEN member. This European 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 s

10、ame status as the official versions. CEN members are the 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, Luxembour

11、g, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All

12、rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1793-6:2012: EBS EN 1793-6:2012EN 1793-6:2012 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 72 Normative references 73 Terms and definitions . 74 Sound insulation index measurements .

13、 124.1 General principle 124.2 Measured quantity . 124.3 Test arrangement . 124.4 Measuring equipment 184.4.1 Components of the measuring system . 184.4.2 Sound source . 184.4.3 Test signal 184.5 Data processing . 194.5.1 Calibration 194.5.2 Sample rate . 194.5.3 Background noise 194.5.4 Scanning te

14、chnique using a single microphone 194.5.5 Scanning technique using nine microphones 204.5.6 Adrienne temporal window . 214.5.7 Placement of the Adrienne temporal window . 224.5.8 Low frequency limit and sample size 234.6 Positioning of the measuring equipment 244.6.1 Selection of the measurement pos

15、itions 244.6.2 Post measurements . 254.6.3 Additional measurements . 254.6.4 Reflecting objects 254.6.5 Safety considerations . 254.7 Sample surface and meteorological conditions . 254.7.1 Condition of the sample surface 254.7.2 Wind 254.7.3 Air temperature 254.8 Single-number rating . 264.8.1 Gener

16、al 264.8.2 Acoustic elements . 264.8.3 Posts . 264.8.4 Global 275 Measurement uncertainty . 276 Measuring procedure 277 Test report 28Annex A (normative) Categorisation of single-number rating 30Annex B (informative) Guidance note on use of the single-number rating 31Annex C (informative) Measuremen

17、t uncertainty . 32Annex D (informative) Template of test report on airborne sound insulation of road traffic noise reducing devices 35Bibliography 47BS EN 1793-6:2012EN 1793-6:2012 (E) 3 Foreword This document (EN 1793-6:2012) has been prepared by Technical Committee CEN/TC 226 “Road equipment”, the

18、 secretariat of which is held by AFNOR. 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 May 2013, and conflicting national standards shall be withdrawn at the latest by March 2014. Attention is dr

19、awn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This European Standard has been prepared, under the direction of Technical Committee CEN/TC 226 “Road

20、 equipment”, by Working Group 6 “Anti noise devices”. EN 1793-6 is part of a series of documents and should be read in conjunction with the following: EN 1793-1, Road traffic noise reducing devices Test method for determining the acoustic performance Part 1: Intrinsic characteristics of sound absorp

21、tion; EN 1793-2, Road traffic noise reducing devices Test method for determining the acoustic performance Part 2: Intrinsic characteristics of airborne sound insulation under diffuse sound field conditions; EN 1793-3, Road traffic noise reducing devices Test method for determining the acoustic perfo

22、rmance Part 3: Normalized traffic noise spectrum; CEN/TS 1793-4, Road traffic noise reducing devices Test method for determining the acoustic performance Part 4: Intrinsic characteristics In situ values of sound diffraction; CEN/TS 1793-5, Road traffic noise reducing devices Test method for determin

23、ing the acoustic performance Part 5: Intrinsic characteristics In situ values of sound reflection and airborne sound insulation. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria,

24、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, Slovakia, Slovenia, Spain, Sweden, Sw

25、itzerland, Turkey and the United Kingdom. BS EN 1793-6:2012EN 1793-6:2012 (E) 4 Introduction Noise reducing devices alongside roads have to provide adequate sound insulation so that sound transmitted through the device is not significant compared with the sound diffracted over the top. This European

26、 Standard specifies a test method for assessing the intrinsic airborne sound insulation performance for noise reducing devices designed for roads in non-reverberant conditions. It can be applied in situ, i.e. where the noise reducing devices are installed. The method can be applied without damaging

27、the surface. 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. The metho

28、d 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 CEN/TS 1793-5) and airborne sound insulation

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

30、ll angles of incidence are equally probable). The test method described in this European Standard should 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 u

31、nder covers. For the purpose of this European Standard, reverberant conditions are defined based on the geometric 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 d

32、efined as being reverberant when the percentage of open space in the envelope is less than or equal to 25 %, i.e. reverberant conditions occur when w/e 0,25, where e = (w+h1+h2). BS EN 1793-6:2012EN 1793-6:2012 (E) 5 Key Keyh1: length of left barrier surface h1: length of partial cover surface envel

33、ope h2: length of right barrier surface e = w+h1envelope, e = w+h1+h2(a) Partial cover on both sides of the road (b) Partial cover on one side of the roadKey Key h1: length of left trench side h1: length of left barrier/building h2: length of right trench side h2: length of right barrier/building en

34、velope, e = w+h1+h2envelope, e = w+h1+h2(c) Deep trench (d) Tall barriers or buildings In all cases: r: road surface; w: width of open space. Figure 1 Sketch of the reverberant condition check in four cases (not to scale) This European Standard introduces a specific quantity, called sound insulation

35、 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 acoustics, sometimes also called transmission loss. Research studies suggest that a very good correlation exists between data measured acco

36、rding to EN 1793-2 and data measured according to the method described in this document. BS EN 1793-6:2012EN 1793-6:2012 (E) 6 This method may be used to qualify noise reducing devices for other applications, e.g. to be installed along railways or nearby industrial sites. In this case, the single-nu

37、mber ratings should be calculated using an appropriate spectrum. BS EN 1793-6:2012EN 1793-6:2012 (E) 7 1 Scope This European Standard describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the

38、sound insulation index. The test method is intended for the following applications: determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions; determination of the in si

39、tu intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use; comparison of design specifications with actual performance data after the completion of the construction work; verification of the long term performance of noise reducing devices (with a repeated appl

40、ication of the method); interactive design process of new products, including the formulation of installation manuals. The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditio

41、ns, e.g. inside tunnels or deep trenches or under covers. Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results need to be give

42、n in a restricted frequency range and the reasons for the restriction(s) need to be clearly reported. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cit

43、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1793-3, Road traffic noise reducing devices Test method for determining the acoustic performance Part 3: Normalized traffic noise spectrum IEC 61672-1:2002, Electroacoustics Sound

44、 level meters Part 1: Specifications 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 noise reducing device device that is designed to reduce the propagation of traffic noise away from the road environment Note 1 to entry: This may be a noise b

45、arrier, cladding, a road cover or an added device. These devices may include both acoustic and structural elements. 3.2 acoustical elements elements whose primary function is to provide the acoustic performance of the device BS EN 1793-6:2012EN 1793-6:2012 (E) 8 3.3 structural elements elements whos

46、e primary function is to support or hold in place acoustic elements 3.4 sound insulation index result of airborne sound insulation test described by Formula (1) 3.5 reference height height hSequal to half the height, hB, of the noise reducing device under test: hS= hB/2 (see Figures 2 and 3) Note 1

47、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). 3.6 source reference plane for sound insul

48、ation index measurements plane facing the sound source side of the noise reducing device and touching the most protruding parts of the device under test within the tested area (see Figures 2, 4 and 9) Note 1 to entry: The device under test includes both structural and acoustic elements. 3.7 micropho

49、ne reference plane plane facing the receiver side of the noise reducing device and touching the most protruding parts of the device under test within the tested area (see Figures 4 and 9) Note 1 to entry: The device under test includes both structural and acoustic elements. 3.8 source reference position position facing the side to be