TEST REPORT - Ursa

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File number: 12/5203-878 Page number: 4Test specimen consists of 3 URSA Air Zero A2 panels, forming a rectangle of 3515 x 3000 mm,which means a test area of 10,55 m². The panels are placed inside the reverberation room withthe face coated with black glass fiber fabric side up, mounted on a metal studs structure. Thecavity under the panels is 37 cm.The perimeter edge of the test specimen is covered with an acoustically reflective frame made ofmedium density wooden boards (DM), in order to prevent the edges from absorbing sound andtake into account only the upper face of test specimen.Images 6 to 8 Installation of test specimen into the reverberation roomImage 9 Sample ready to be tested
File number: 12/5203-878 Page number: 55.- DEFINITIONS AND CLASSIFICATION5.1. Reverberation time. Time, in seconds, that would be required for the sound pressurelevel to decrease by 60 dB after the sound source has stopped.5.2. Equivalent sound absorption area of a room. Hypothetical area of a totally absorbingsurface without diffraction effects which, if it were the only absorbing element in the room,would give the same reverberation time as the room under consideration.5.3. Equivalent sound absorption area of the test specimen, A T . Difference between theequivalent sound absorption area of the reverberation room with and without the test specimen.To calculate this parameter the average reverberation time in the reverberation room ismeasured with and without the test specimen. From these reverberation times the equivalentsound absorption area, A T , shall be calculated using the Sabine formula:⎛ 1= A2− A1= 55.3 V⎜⎝ c 2T21- 4 V (mc T ⎟ ⎞−1 1 ⎠- mAT2 1where:• c 1 and c 2 are the propagation speed of sound in air temperatures t 1 and t 2 ,• V is the volume, in cubic metres, of the empty reverberation room,• T 1 is the reverberation time, in seconds, of the empty reverberation room,• T 2 is the reverberation time, in seconds, of the empty reverberation room after the testspecimen has been introduced,• m 1 and m 2 are the power attenuation coefficients, in reciprocal metres, of the emptyreverberation room and with the test specimen, respectively. The value of m iscalculated according to the International Standard ISO 9613-1 using the climaticconditions that have been present during the measurement.)The value of m can be calculated from the attenuation coefficient, α, which is used inInternational Standard ISO 9613-1 in accordance with the formula:αm =10 log (e)
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TEST REPORT - Ursa

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