DIN EN 1793-4-2015 Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4 Intrinsic characteristics - In situ values of sound diffracti.pdf

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1、May 2015 Translation by DIN-Sprachendienst.English price group 15No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 17

2、.140.30; 93.080.30!%By“2315886www.din.deDDIN EN 1793-4Road traffic noise reducing devices Test method for determining the acoustic performance Part 4: Intrinsic characteristics In situ values of sound diffraction;English version EN 1793-4:2015,English translation of DIN EN 1793-4:2015-05Lrmschutzvor

3、richtungen an Straen Prfverfahren zur Bestimmung der akustischen Eigenschaften Teil 4: Produktspezifische Merkmale In-situ-Werte der Schallbeugung;Englische Fassung EN 1793-4:2015,Englische bersetzung von DIN EN 1793-4:2015-05Dispositifs de rduction du bruit du trafic routier Mthode dessai pour la d

4、termination des performances acoustiques Partie 4: Caractristiques intrinsques Valeurs in-situ de la diffraction acoustique;Version anglaise EN 1793-4:2015,Traduction anglaise de DIN EN 1793-4:2015-05SupersedesDIN CEN/TS 1793-4:2004-03www.beuth.deDocument comprises 36 pagesIn case of doubt, the Germ

5、an-language original shall be considered authoritative.04.15 DIN EN 1793-4:2015-05 2 A comma is used as the decimal marker. National foreword This document (EN 1793-4:2015) has been prepared by Technical Committee CEN/TC 226 “Road equipment” (Secretariat: AFNOR, France). The responsible German body

6、involved in its preparation was the DIN-Normenausschuss Bauwesen (DIN Standards Committee Building and Civil Engineering), Working Committee NA 005-10-26 AA Lrmschutzvorrichtungen (SpA zu CEN/TC 226/WG 6), Gemeinschaftsausschuss mit FGSV. At the beginning of 2013 the responsible German Working Commi

7、ttee decided to make a change to the German titles of the DIN EN 1793 series of standards. It was decided to change the German term Lrmschutzeinrichtung to Lrmschutzvorrichtung (noise reducing device) in all of the titles. The German titles in the series have thus been modified. Some inconsistencies

8、 will remain as regards these titles (e.g. in the Normative References or Bibliographies) until all of the standards in the DIN EN 1793 series and other related standards are revised. In addition to the legal units of measurement, this standard also uses the unit “in” (inch). It should, however, be

9、noted that the Gesetz ber Einheiten im Messwesen (German Law on units in metrology) prohibits the use of the unit “inch” for official and commercial purposes in Germany. Conversion 1 inch = 25,4 mm Amendments This standard differs from DIN CEN/TS 1793-4:2004-03 as follows: a) the airborne sound insu

10、lation characteristics of the reference wall have been specified in terms of the minimum values of the Sound Insulation Index, measured according to EN 1793-6; b) the sound absorbing characteristics of the reference wall have been specified in terms of the minimum values of the sound absorption coef

11、ficient, measured according to EN ISO 354, it needs to have when lined on the source side with an absorptive flat layer of a single porous material; c) the sound source positions have been reduced from six to four and are now all obligatory; d) the microphone positions have been reduced from 12 to 1

12、0 and are now all obligatory; e) a “free-field” impulse response to be measured for each microphone position and therefore a geometrical spreading correction factor is no more needed in Equation (1); f) consideration of the measurement uncertainty has been added (see Clause 5 and Annex B); g) the su

13、mmary of the test procedure (Clause 6) has been updated to reflect the changes compared to the previous published version. Previous editions DIN CEN/TS 1793-4: 2004-03 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1793-4 March 2015 ICS 17.140.30; 93.080.30 Supersedes CEN/TS 1793-4:2003English

14、 Version Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction Dispositifs de rduction du bruit du trafic routier - Mthode dessai pour la dtermination des performances acoustiques - Partie

15、4: Caractristiques intrinsques - Valeurs in-situ de la diffraction acoustique Lrmschutzvorrichtungen an Straen - Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 4: Produktspezifische Merkmale - In-situ-Werte der Schallbeugung This European Standard was approved by CEN on 13 December

16、 2014. CEN members are bound to comply 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 obtain

17、ed on application to the CEN-CENELEC 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-

18、CENELEC Management Centre has the same 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,

19、Italy, Latvia, Lithuania, Luxembourg, 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 CEN-CENELEC Management Centre:

20、Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1793-4:2015 EEN 1793-4:2015 (E) 2 Contents Page Foreword 4 Introduction . 5 1 Scope 6 2 Normative references 6 3 Terms, definitions and symbols

21、. 7 3.1 Terms and definitions . 7 3.2 Symbols 8 4 Sound diffraction index difference measurements 10 4.1 General principle . 10 4.2 Dimensions and specifications 10 4.2.1 Added devices . 10 4.2.2 Reference walls 10 4.2.3 In situ tests . 11 4.3 Positions of the sound source . 11 4.4 Position of the m

22、icrophone(s) 12 4.5 Free-field measurements 13 4.6 Measured quantity . 17 4.7 Measuring equipment 18 4.7.1 Components of the measuring system . 18 4.7.2 Sound source . 19 4.7.3 Test signal 20 4.8 Data processing . 20 4.8.1 Calibration 20 4.8.2 Sample rate. 20 4.8.3 Background noise . 21 4.8.4 Measur

23、ement points 21 4.8.5 Adrienne temporal window . 21 4.8.6 Placement of the Adrienne temporal window . 22 4.8.7 Low frequency limit and sample size 23 4.9 Positioning of the measuring equipment 24 4.9.1 Selection of the measurement positions 24 4.9.2 Reflecting objects 24 4.9.3 Safety considerations

24、. 25 4.10 Sound diffraction index difference 25 4.11 Single-number rating of sound diffraction index difference DLDI. 25 4.12 Sample surface and meteorological conditions . 26 4.12.1 Condition of the sample surface 26 4.12.2 Wind 26 4.12.3 Air temperature 26 5 Measurement uncertainty . 26 6 Measurin

25、g procedure 26 6.1 General 26 6.2 Test report 27 Annex A (informative) Indoor measurements for product qualification 29 A.1 General 29 A.2 Parasitic reflections . 29 A.3 Reverberation time of the room . 29 Annex B (informative) Measurement uncertainty. 30 DIN EN 1793-4:2015-05 EN 1793-4:2015 (E) 3 B

26、.1 General . 30 B.2 Expression for the calculation of sound diffraction index 30 B.3 Contributions to measurement uncertainty 31 B.4 Expanded uncertainty of measurement 32 B.5 Measurement uncertainty based upon reproducibility data . 32 Bibliography 33 DIN EN 1793-4:2015-05 EN 1793-4:2015 (E) 4 Fore

27、word This document (EN 1793-4:2015) has been prepared by Technical Committee CEN/TC 226 “Road equipment”, the 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

28、 September 2015 and conflicting national standards shall be withdrawn at the latest by September 2015. Attention is drawn 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 suc

29、h patent rights. This document supersedes CEN/TS 1793-4:2003. The major changes compared to the previous published version are: the airborne sound insulation characteristics of the reference wall are specified in terms of the minimum values of the Sound Insulation Index, measured according to EN 179

30、3-6, it needs to have; the sound absorbing characteristics of the reference wall are specified in terms of the minimum values of the sound absorption coefficient, measured according to EN ISO 354, it needs to have when lined on the source side with an absorptive flat layer of a single porous materia

31、l; the sound source positions have been reduced from six to four and are now all obligatory; the microphone positions have been reduced from 12 to 10 and are now all obligatory; a “free-field” impulse response to be measured for each microphone position and therefore a geometrical spreading correcti

32、on factor is no more needed in Formula (1); consideration of the measurement uncertainty has been added (see Clause 5 and Annex B); the summary of the test procedure (Clause 6) has been updated to reflect the changes compared to the previous published version. This document should be read in conjunc

33、tion with: EN 1793-1, Road traffic noise reducing devices Test method for determining the acoustic performance Part 1: Intrinsic characteristics of sound absorption under diffuse sound field conditions EN 1793-3, Road traffic noise reducing devices Test method for determining the acoustic performanc

34、e Part 3: Normalized traffic noise spectrum CEN/TS 1793-5, Road traffic noise reducing devices Test method for determining the acoustic performance Part 5: Intrinsic characteristics In situ values of sound reflection and airborne sound insulation. EN 1793-6, Road traffic noise reducing devices Test

35、method for determining the acoustic performance Part 6: Intrinsic characteristics In situ values of airborne sound insulation under direct sound field conditions According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement

36、this European Standard: 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, Slov

37、akia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 1793-4:2015-05 EN 1793-4:2015 (E) 5 Introduction Part of the market of road traffic noise reducing devices is constituted of products to be added on the top of noise reducing devices and intended to contribute to sound

38、 attenuation acting primarily on the diffracted sound field. These products will be called added devices. This European Standard has been developed to specify a test method for determining the acoustic performance of added devices. The test method can be applied in situ, i.e. where the traffic noise

39、 reducing devices and the added devices are installed. The method can be applied without damaging the traffic noise reducing devices or the added devices. The method can be used to qualify products before the installation along roads as well as to verify the compliance of installed added devices to

40、design specifications. Repeated application of the method can be used to verify the long term performance of added devices. This method could be used to qualify added devices for other applications, e.g. to be installed along railways or nearby industrial sites. In this case, special care needs to b

41、e taken into account in considering the location of the noise sources and the single-number ratings should be calculated using an appropriate spectrum. No other national or international standard exists about the subject of this European Standard. DIN EN 1793-4:2015-05 EN 1793-4:2015 (E) 6 1 Scope T

42、his European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge

43、of a noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height (the method described gives the acoustic benefi

44、t over a simple barrier of the same height; however, in practice the added device can raise the height and this could provide additional screening depending on the source and receiver positions). The test method is intended for the following applications: preliminary qualification, outdoors or indoo

45、rs, of added devices to be installed on noise reducing devices; determination of sound diffraction index difference of added devices in actual use; comparison of design specifications with actual performance data after the completion of the construction work; verification of the long term performanc

46、e of added devices (with a repeated application of the method); interactive design process of new products, including the formulation of installation manuals. The test method can be applied both in situ and on samples purposely built to be tested using the method described here. Results are expresse

47、d as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in the restricted frequency range and the reasons of the restriction(s) shall be clearly repo

48、rted. A single-number rating is calculated from frequency data. For indoors measurements see Annex A. 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 cited 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 dete