Report. Laboratory for Acoustics. determination of the airborne sound insulation of a Rockdelta NoiStop Green barrier

Transcription

1 Report Member ONRI ISO-9001: 2000 certified Laboratory for Acoustics determination of the airborne sound insulation of a Rockdelta NoiStop Green barrier Report number H E dd. 22 December 2008 Peutz bv Paletsingel 2, Postbus AR Zoetermeer Tel. (079) Fax (079) info@zoetermeer.peutz.nl Peutz bv Lindenlaan 41, Molenhoek Postbus 66, 6585 ZH Mook Tel. (024) Fax (024) info@mook.peutz.nl Peutz bv L. Springerlaan 37, Groningen Postbus 7, 9700 AA Groningen Tel. (050) Fax (050) info@groningen.peutz.nl Peutz GmbH Düsseldorf, Bonn info@peutz.de Principal: Mobilane B.V. PO Box NE Leersum The Netherlands Report number: H E Date: 22 December 2008 Peutz SARL Paris, Lyon Info@peutz.fr Peutz bv London info@peutz.co.uk Daidalos Peutz bvba Leuven Info@daidalospeutz.be Köhler Peutz Geveltechniek bv Zoetermeer Info@gevel.com Ref.: MV/RA/LvI/H E-RA All orders to our consultancy are accepted, carried out and charged in accordance with 'The New Rules 2005; Legal relationship client-architect, engineer and consultant' (DNR 2005). KvK: BTW: NL B01.

2 Index page 1. INTRODUCTION 3 2. NORMS AND GUIDELINES 4 3. TESTED CONSTRUCTION 5 4. MEASUREMENTS Method Accuracy Repeatability r Reproducibility R Results 7 H E-RA 2

3 1. INTRODUCTION At the request of Mobilane BV based in Leersum (The Netherlands) sound insulation measurements have been carried out on a Rockdelta NoiStop Green barrier in the Laboratory for Acoustics of Peutz bv, at Mook, The Netherlands (see figure 1). 1 For this type of measurements the Laboratory for Acoustics has been accredited by the Dutch Stichting Raad voor Accreditatie (RvA). The RvA is member of the EA MLA 1 1 EA MLA: European Accreditation Organisation MultiLateral Agreement: EA: Certificates and reports issued by bodies accredited by MLA and MRA members are considered to have the same degree of credibility, and are accepted in MLA and MRA countries. H E-RA 3

4 2. NORMS AND GUIDELINES The measurements have been carried out according to the Quality Manual of the Laboratory for Acoustics as well as: ISO 140-3:1995 NOTE: Acoustics - Measurements of sound insulation in buildings and of building elements: Part 3: Laboratory measurements of airborne sound insulation of building elements this international standard has been accepted within all EU-countries as European Norm EN ISO 140-3:1995 Various other related norms: ISO 140-1:1997 Acoustics - Measurement of sound insulation of building elements - Part 1: Requirements for laboratory test facilities with suppressed flanking transmission NOTE: this international standard has been accepted within all EU-countries as European Norm EN ISO 140-1:1997 ISO 140-2:1991 Acoustics - Measurement of sound insulation of building elements - Part 2: Determination, verification and application of precision data NOTE: this international standard has been accepted within all EU-countries as European Norm EN :1993 ISO 717-1:1996 NOTE: Acoustics - Rating of sound insulation in buildings and of building elements - Part 1: Airborne sound insulation this international standard has been accepted within all EU-countries as European Norm EN ISO 717-1:1996 EN :1997 Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 2: Intrinsic characteristics of airborne sound insulation EN :1997 Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 3: Normalised traffic noise spectrum H E-RA 4

5 3. TESTED CONSTRUCTION The measurements have been carried out on a barrier, composed of elements with dimensions width x height x thickness 2000 x 900 x 117 mm, weight 50,2 kg (measured). The elements are composed of een steel frame, filled with rockwool (weight according to principal 175 kg/m 3 ) which is covert with an wire netting. See photo 1. The test specimen is mounted in the test opening and assembled between wooden pools in the same manner as the barrier is used in practice with the same connections and seals between the component parts, see photo 2. photo 1; construction barrier elements photo 2; Barrier elements in test opening The results as presented here relate only to the tested items and laboratory conditions as described in this report. The laboratory can make no judgement about the representativity of the tested samples. H E-RA 5

6 4. MEASUREMENTS 4.1. Method The tests were conducted in accordance with the provisions of the test method ISO in the Laboratory for Acoustics of Peutz bv in Mook. A detailed description of the test set up has been given in the figure 2 of this report. The construction to be tested is placed into a test opening between two measuring rooms. In one of the rooms (the so-called sending room) loudspeakers generate broadband noise. In this sending room as well as in the adjacent room (the "receiving room") the resulting sound pressure level is measured by means of a continuous rotating boom, so the (timeand space-) averaged sound pressure level is determined. The reverberation time of the receiving room is also measured. The instruments and the method used meet the requirements of ISO As allowed by the test method the test procedure is repeated reversing the sending and receiving rooms. The reported value of each sound insulation is the arithmetic average of the two results. In ISO the airborne sound insulation of an object is defined as the "sound reduction index R" to be evaluated according to formula 1 and expressed in db: S = L1 - L + 10 lg (1) A R 2 in which: L 1 = sound pressure level in the sending room [db] L 2 = sound pressure level in the receiving room [db] S = area of the object to be tested [m 2 ] A = equivalent sound absorption [m 2 ] in the receiving room according to: 0.16 V A = T in which : V = volume of the receiving room [m 3 ] T = reverberation time in the receiving room [s] (2) H E-RA 6

7 4.2. Accuracy The accuracy of the airborne sound insulation as calculated can be expressed in terms of repeatability (tests within one laboratory) and reproducibility (between various laboratories) Repeatability r When: - two tests are performed on identical test material - within a short period of time - by the same person or team - using the same instrumentation - under unchanged environmental conditions - the probability will be 95% that the difference between the two test results will be less than or equal to r. In order to evaluate the repeatability r for the sound insulation measurements performed in the laboratories of Peutz bv in Mook eight series of measurements have been carried out according to ISO From the results of those measurements the repeatability r has been calculated. It was found that for the frequency range from 100 to 250 Hz the repeatability r is 2.0 db as a maximum. For the frequency range 315 to 3150 Hz the repeatability r is 1.3 db as a maximum. The repeatability r regarding the single-figure rating R w is 0.7 db as a maximum. As ISO prescribes rounding of the R w -values to the nearest db repeatability r of 1 db is applicable for the R w -value. From these results it may be concluded that the repeatability r as found satisfies the demands of ISO Reproducibility R When: - two tests are performed on identical test material - in different laboratories - by different person(s) - under different environmental conditions - the probability will be 95% that the difference between the two test results will be less than or equal to R In ISO there is a statement on the reproducibility R to be expected, based on the results of various inter-laboratory tests. The reproducibility of the single figure rating R w is about 3 db Results The results of the measurements are given in table 1 and in figure 3. In the table and graph the values of the insulation found are presented in 1/3 octave bands. From these values the following single-number ratings have been calculated and stated: - weighted sound reduction index R w according to ISO including the spectrum adaptation terms C and C tr - the single-number rating of airborne sound insulation DL R " according to EN H E-RA 7

8 Tabel 1 measurement nr. Measurement results airborne sound insulation R [db] 1 record nr. #41 frequency [Hz] 1/3 oct. 1/1 oct , ,5 14, , ,4 15,4 16,4 18,3 19,5 16,0 21,9 26,2 25,5 31,2 34,0 39,3 15,7 17,7 24,1 33, R w(c;c tr) DL R (EN ) Category 41,8 43,5 43,3 45,2 24(-1;-3) db 21 B2 The results as presented here are based on a testing area of 11,6 m 2. In situations where different dimensions and/or method of mounting differ from the ones tested, different results may be found. Mook, Th. Scheers Laboratory Supervisor ir. G.M.A. Perquin Manager This report contains: 8 pages, 3 figures. H E-RA 8

9 LABORATORY FOR ACOUSTICS PEUTZ bv Lindenlaan 41, NL-6584 AC MOLENHOEK (LB), THE NETHERLANDS Story OVERVIEW air supply silencer plenum silencer (E) (8) floor measurement of the reduction of transmitted impact noise (9) waste water level mm Ground level opening (A) (closed) w x h = 1.30 x 1.80 m plenum air supply installations (6) (5) (4) (A) reverberation room (3) (B) (C) (D) receiving room (2) sending room (1) sanitairy installations (7) suspended ceilings or raised floors workshop heating wc shower conference room analyses overhead door TEST OPENINGS (w x h in mm) (B) 1000 x 2200 (C) 1500 x 1250 (D) 4300 x 2800 (E) 4000 x m scale report nr. H E figure nr. 1

10 LABORATORY FOR ACOUSTICS PEUTZ bv Lindenlaan 41, NL-6584 AC MOLENHOEK (LB), THE NETHERLANDS SOUND INSULATION TEST FACILITIES The test rooms meet the requirements of ISO Additional data: - volume of the receiving room: 111 m3 - volume of the source room: 94 m3 - area of the test specimen: 12,0 m2 Both rooms are isolated for vibrations by using a so called room-in-room construction. Flanking transmission is thus minimised. height: allong the walls 2840 increasing to 2920 at the perimeter of the testopening for floors expansion joint height at a: 3055 height at b: 3058 height at c: 3052 height at d: 3062 a detail A b testopening C (1500 x 1250) (2) RECEIVING ROOM (testopening for floors in the "ceiling") testopening (12 m2) (4297 x 2796) (1) SENDING ROOM d testwall for sanitary installations c dimensions in mm m scale detail A expansion joint 3 x plywood 40 x 120 mm Position of specimen 180 mm mm report nr. H E figure nr. 2

11 LABORATORY FOR ACOUSTICS MEASUREMENT OF THE SOUND INSULATION ACCORDING TO ISO 140-3:1995 principal: construction tested: Rockdelta NoiStop Green barrier volume measuring room: 111 m 3 60 db Insulat rel. 2.4, mode 1 file: h3375 S#:39-40 ##:41 volume measuring room: 94 m 3 surface area tested partition: 11,64 m 2 measured at: Peutz Laboratory for Acoustics signal: broad-band noise bandwidth: 1/3 octave ISO 717-1:1996 R w(c;c tr) = 24(-1;-3) db * 1/3 oct. 1/1 oct. ref. curve (ISO 717) sound reduction index R * * * k frequency 2k 4k Hz 17,1 15,4 18,3 21,9 31,2 41,8 1/3 oct. 14,5 15,4 19,5 26,2 34,0 43,5 db 13,0 16,4 16,0 25,5 39,3 45,2 1/1 oct. 14,6 15,7 17,7 24,1 33,7 43,3 db publication is permitted for the entire page only Mook, report nr. H E Figure nr. 3 * * *