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 1: Intrinsic characteristics of sound absorptionBS EN 1793-1:2012Copyright European Co
2、mmittee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN 1793-1:2012. It supersedes BS EN 1793-1:1998 which is withdrawn.The UK participat
3、ion in its preparation was entrusted by Technical Committee B/509, Road equipment, to Subcommittee B/509/6, Fences for the attenuation of noise.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the neces
4、sary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013.Published by BSI Standards Limited 2013 ISBN 978 0 580 71106 0 ICS 17.140.30; 93.080.30Compliance with a British Standard cannot confer immunity from legal obligations.This Britis
5、h Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2013.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS EN 1793-1:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleN
6、o reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1793-1 November 2012 ICS 17.140.30; 93.080.30 Supersedes EN 1793-1:1997English Version Road traffic noise reducing devices - Test method for determining the acoustic performance -
7、 Part 1: Intrinsic characteristics of sound absorption Dispositifs de rduction du bruit du trafic routier - Mthode dessai pour la dtermination de la performance acoustique - Partie 1: Caractristiques intrinsques de labsorption acoustique Lrmschutzvorrichtungen an Straen - Prfverfahren zur Bestimmung
8、 der akustischen Eigenschaften - Teil 1: Produktspezifische Merkmale der Schallabsorption This European Standard was approved by CEN on 29 September 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the st
9、atus 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French,
10、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 national standards bodies of Austria, Belgium, Bulgaria, Cro
11、atia, 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, Switzerland, Turkey and
12、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 rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1793-1:2
13、012: EBS EN 1793-1:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1793-1:2012 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 52 Normative references 53 Symbols 54
14、Test arrangement . 55 Test procedure and evaluation 66 Test report 7Annex A (normative) Categorisation of single-number rating . 9Annex B (informative) Guidance note on use of the number rating DL10Annex C (informative) Measurement uncertainty 11BS EN 1793-1:2012Copyright European Committee for Stan
15、dardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1793-1:2012 (E) 3 Foreword This document (EN 1793-1:2012) has been prepared by Technical Committee CEN/TC 226 “Road equipment”, the secretariat of which is held by
16、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 drawn to the possibility that some
17、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 document supersedes EN 1793-1:1997. In the previous version of this European Standard, the basic test method was derived from EN
18、20354:1985; in the current version of this European Standard, the basic test method is derived from EN ISO 354:2003. This change is concerned with how to consider the sound attenuation in the air (see explanations under the last paragraph of the Introduction). EN 1793-1 is part of a series and shoul
19、d be read in conjunction with the following: 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 me
20、thod for determining the acoustic performance 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 re
21、ducing 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 method for determining the acoustic performance Part 6: Intrinsic characteristic
22、s In situ values of airborne sound insulation under direct sound field conditions. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Repu
23、blic, 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, Switzerland, Turkey and the United Kingdom. BS E
24、N 1793-1:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1793-1:2012 (E) 4 Introduction Where a sound reflecting surface is installed along a road, it may be effective to
25、use sound absorbing devices on its traffic side to reduce additional noise nuisance caused by reflected sound. This treatment may be needed in the presence of the following: noise barriers, rocks or retaining walls that can reflect sound waves toward unprotected areas; vertical cuttings or reflectiv
26、e surfaces that face each other; tunnels and their approaches; traffic passing close to a barrier where reflections between the vehicles and the barrier may reduce effectiveness. This European Standard specifies a test method for qualifying the sound absorption performance of noise reducing devices
27、designed for roads (a measure of intrinsic performance). It is not concerned with determining insertion loss (extrinsic performance) which depends on additional factors which are not related to the product itself, e.g. the dimensions of the barrier and quality of installation work and site factors s
28、uch as ground impedance, site geometry etc. The test is designed to allow the intrinsic sound absorption performance of the device to be measured; the resulting rating should aid the selection of devices for particular roadside applications. This method may be used to qualify noise reducing devices
29、for other applications, e.g. found along railways or near industrial sites. In these cases, the single-number ratings should be calculated using an appropriate spectrum. In the previous version of this European Standard dated September 1997, the basic test method was derived from EN 20354:1985. In t
30、he current version of this European Standard, the basic test method is derived from EN ISO 354:2003. In the current version of the basic test method, an essential change was introduced compared to the previous version, viz. the application of a correction method for changes in sound attenuation in a
31、ir caused by changes in air temperature and humidity during the test. Because this correction was not applied in the previous version of the test method, the results from the current version may deviate considerably from the results obtained with the previous version of the method. Specifically for
32、test samples with a high absorption coefficient, these changes may amount to 1 dB or 2 dB for the single number rating DL, either in a positive or a negative sense. The effect of the application of the correction will be most noticeable in the higher frequency bands. To avoid possible confusion betw
33、een the old and the new measurement results, the continued use of measurement results obtained with the previous version of this European Standard (dated September 1997) is not recommended. BS EN 1793-1:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot fo
34、r ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1793-1:2012 (E) 5 1 Scope This European Standard specifies the laboratory method for measuring the sound absorption of flat noise barriers or flat cladding for retaining walls or tunnels. It covers the assessment of the
35、intrinsic sound absorption performance of roadside noise reducing devices that can reasonably be assembled inside the testing facility described in EN ISO 354. The test method in EN ISO 354 referred to in this European Standard is strictly valid only for plane absorbers; in particular, it excludes d
36、evices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases care is needed in interpreting the results. NOTE The test method in EN ISO 354 is based on measurements in a reverberation room where diffuse sound field conditions prevail.
37、 As a uniformly applicable method for the determination of the sound absorptive performance of noise reducing devices under free field conditions is still under development, the measurement results according to this European Standard are temporarily considered relevant for application on noise reduc
38、ing devices in reverberant as well as in free field conditions. 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, th
39、e 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 EN ISO 354, Acoustics Measurement of sound absorption in a reverberation room
40、(ISO 354) 3 Symbols For the purposes of this document, the following symbols apply: SiSound absorption coefficient in the ithone-third octave band LiNormalised A-weighted sound pressure level, in decibels, of traffic noise in the ithone-third octave band defined in EN 1793-3 DLSingle-number rating o
41、f sound absorption performance expressed as a difference of A-weighted sound pressure levels, in decibels 4 Test arrangement The test arrangement shall be as described in EN ISO 354 with the following modifications: The test specimen shall be assembled in the test chamber in the same manner as the m
42、anufactured device, with the same connections and seals between component parts. All the reflecting parts exposed on the traffic side of the material (posts, brackets and other parts) shall be present on the specimen as in practice. Where posts are employed in construction, at least one post shall b
43、e included in the specimen with panels attached on both sides. The length of the panels on one side of the post shall be 2 m (see Figure 1). The side that would face the traffic shall face the inner part of the room. For testing barriers, the specimen shall be placed directly against one of the surf
44、aces (floor, wall or ceiling) of the chamber, without air gaps. If the use of posts according to the instruction given above BS EN 1793-1:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license f
45、rom IHS-,-,-EN 1793-1:2012 (E) 6 would introduce an air gap between the back of the noise barrier elements and the surface of the room, modifications shall be made to the posts to ensure that the back of the noise barrier elements is placed directly against the room surface. For testing absorptive c
46、ladding for use on retained cuttings, tunnel walls and other reflective surfaces, the specimen shall be mounted against one of the surfaces of the chamber leaving the same air gap as proposed for the actual construction. In these conditions, the distance between the back of the sample and the surfac
47、e of the chamber shall be clearly reported. Key 1 reflective frame 5 reflective frame (sealed against sample) 2 panels (sealed as in practice) 6 panels 3 post 7 chamber surface (floor) 4 L 2 m 8 post (sealed as in practice) Figure 1 Illustration of post arrangement 5 Test procedure and evaluation 5.
48、1 Test method The sound absorption coefficients Si in each one-third octave band in the range 100 Hz to 5 kHz shall be determined using the method described in EN ISO 354. BS EN 1793-1:2012Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1793-1:2012 (E) 7 5.2 Single-number rating of sound absorption DLA single-number rating shall be derived to indicate the performance of the product. The individual s
