SIST EN 20140-9:1997

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Messung der Schalldämmung in Bauten und von Bauteilen - Teil 9: Raum-zu-Raum-Messung der Luftschalldämmung von Unterdecken mit darüberliegendem Hohlraum im Prüfstand (ISO 140-9:1985)Acoustique - Mesurage de l'isolation acoustique des immeubles et des éléments de construction - Partie 9: Mesurage en laboratoire de l'isolation au bruit aérien de piece a piece par un plafond suspendu surmonté d'un vide d'air (ISO 140-9:1985)Acoustics - Measurement of sound insulation in buildings and of building elements - Part 9: Laboratory measurements of room-to-room airborne sound insulation of a suspended ceiling with a plenum above it (ISO 140-9:1985)91.120.20L]RODFLMDAcoustics in building. Sound insulation91.060.30Stropi. Tla. StopniceCeilings. Floors. Stairs17.140.01Acoustic measurements and noise abatement in generalICS:Ta slovenski standard je istoveten z:EN 20140-9:1993SIST EN 20140-9:1997en01-april-1997SIST EN 20140-9:1997SLOVENSKI
STANDARD



SIST EN 20140-9:1997



SIST EN 20140-9:1997



SIST EN 20140-9:1997



SIST EN 20140-9:1997



SIST EN 20140-9:1997



INTERNATIONAL STANDARD ISO 140/9-1985 (El Acoustics - Measurements of Sound insulation in buildings and of building elements - Part 9 : Laboratory measurement of room-to-room airborne Sound insulation of a suspended ceiling with a Plenum above it 1 Scope and field of application This part of ISO 140 specifies a laboratory method of measuring the airborne Sound insulation of a suspended ceiling with a Plenum of defined height mounted above an acoustical barrier which separates two rooms of a specified test facility. This method utilizes a laboratory space so arranged that it simulates a pair of horizontally adjacent, typical offices or rooms sharing a common suspended ceiling System, Plenum space and a dividing Wall. The dividing wall extends to the underside of the ceiling System which at the junction is either continuous or discontinuous. The quantity being measured is the airborne Sound insulation between two rooms of a specified test facility when the Sound transmitted by paths other than the suspended ceiling and common Plenum space is negligible. This quantity is called the suspended ceiling normalized level differente. The method may be extended to include the study of compo- site ceiling Systems comprising the ceiling material and other components such as luminaires and ventilating Systems. The method may also be extended to the study of the additional Sound insulation that may be achieved by auxiliary Systems, such as material used either as Plenum barriers or as backing for all of, or part of, the ceiling. 2 References ISO 140/2, Acoustics - Measurement of Sound insulation in buildings and of building elements - Part 2 : Statement of pre- cision requiremen ts. ISO 354, Acoustics - Measurement of Sound absorption in a reverberation room. ISO 71711, Acoustics - Rating of Sound insulation in buildings and of building elements - Part 7 : Airborne Sound insulation in buildings and of in terior building elements. IEC Publication 225, Octave, half-octave and third-octave band filters intended for the analysis of Sounds and vibra tions. 3 Definitions For the purpose of this part of ISO 140, the following defini- tions apply. 3.1 average Sound pressure level in a room : Ten times the common logarithm of the ratio of the space and time average of the Sound pressure squared to the Square of the reference Sound pressure, the space average being taken over the entire room with the exception of those Parts where the direct radiation of a Sound Source or the near field of the boun- daries (Wall, etc.) is of significant influence. This quantity is denoted by L and is expressed in decibels. L = 1Olg p:+p;+ . . . +p; . . . npo (1) where Pl1 P2‘ .I P* are the r.m.s. Sound pressures at n different. positions in the room; po = 20 pPa is the reference Sound pressure. 3.2 level differente : The differente in the space and time average Sound pressure levels produced in two rooms by a Sound Source in one of the rooms. This quantity is denoted by D and is expressed in decibels. D= L, -L, . . . (2) where L, is the average Sound pressure level in the Source room; L2 is the average Sound pressure level in the receiving room. SIST EN 20140-9:1997



ISO 140/9-1985 (E) 3.3 suspended ceiling normalized level differente : The level differente corresponding to a reference value of absorp- tion area in the receiving room. This quantity is denoted by D n C, and is expressed in decibels. I The volume V of each room shall be at least 50 m3 and the dividing wall shall be positioned such that the two room volumes differ by at least 10 % when the suspended ceiling is in Position. NOTES (3) 1 It is realized that existing facilities may have room volumes less than 50 m3, as low as 40 m3. Such facilities will be allowable in accordance with this part of ISO 140 in cases where diffusing elements are used. D is the level differente; 2 The requirements and recommendations, as stated above, are in- tended to improve reproducibility between measurements made by dif- ferent organizations on similar materials. A is the equivalent absorption area in the receiving room; Ao is the reference absorption area. (For the laboratory, Ao = 10 m2.) 5.1.3 Dividing wall The dividing wall is the acoustical barrier which divides the test facility below the suspended ceiling into two rooms. The wall shall be tapered at its upper extremity so that its Overall thickness at the capping is not greater than 100 mm. The taper- ing between the widest part of the wall and the capping shall be achieved by means of an angle not exceeding 30° from the ver- tical. The construction of the dividing wall shall be of such materials that its Sound insulation is IO dB more than that of any ceiling which is likely to be tested. 3.4 Plenum space : The whole of the void above the suspended ceilings in both rooms in the test facility, disre- garding any sound-absorbing material Stuck to the Walls or laid on the back of the suspended ceiling. 4 Measuring equipment The measuring equip ment quirements of clause 6. shall be suitable for meeting the re- NOTE - For checking the Sound insulation of the facility, a suitable Plenum barrier of construction similar to the dividing wall tan be in- stalled between the top of the dividing wall and the roof. _. 5 Test arrangement 5.1.4 Plenum depth The Plenum depth shall be between 650 and 760 mm as measured from the upper face of the suspended ceiling to the underside of the roof of the test facility. 5.1 Requirements for the laboratory The laboratory test facility is divided into two rooms of approxi- mately equal volumes by a Wall. The essential features of the test facility are specified in 5.1.1 to 5.1.6 and are shown schematically in the figure. 5.1.5 Plenum lining One sidewall and both endwalls of the Plenum shall be lined with suitable sound-absorbing material. This material shall have such properties that when tested as a plane absorber in accor- dance with ISO 354, it has Sound absorption coefficients not less than those shown in the table. 5.1.1 Construction of the test facility The test facility shall be a rectangular parallelepiped. lt is recommended that a Vibration break be provided in the outer Walls, floor and roof of the facility in Order to ensure that flank- ing transmission by paths other than the suspended ceiling and common Plenum space is negligible. Table The level of the background noise shall be sufficiently low to permit a measurement of the Sound transmitted from the Source room, taking into consideration the power output of the Source room and the isolating properties of the specimens for which the laboratory is intended. The reverberation time in each room shall be greater than 1 s at all one-third octave bands of measurement with no Plenum lining and no test specimen in place. Centre frequency Hz Sound absorption coeff icient, a, 125 250 500 1 000 2 000 4 000 0,65 0,80 0,80 0,80 0,80 0,80 For the other sidewall and the roof, the Sound absorption coef- ficient shall be less than 0,lO at all frequencies given in the table. NOTE - For the purposes of determining the reverberation time of each room, a suitable impervious Plenum barrier should be installed be- tween the top of the dividing wall and the roof. For practical purposes, the thickness of the lining shall not ex- ceed 150 mm. 5.1.2 Dimensions of the test facility The width of the test facility shali be 4,5 ?I 0,5 m and the height from the ground to the underside of the face of the suspended ceiling shall be 28 k 0,2 m when all dimensions are measured internally. 5.1.6 Diff users If nec
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