A single number descriptor, weighted sound reduction index Rw is used to facilitate comparison of the performance of different element. To determine the Rw for a particular element, a curve fitting technique is used to fit the calculated one-third octave sound reduction index. Rw contours consist of a horizontal segment from to Hz, a middle segment increasing by 5 dB from to Hz and a low frequency segment increasing by 18 dB from to Hz.
The Rw rating of an element is determined by plotting the one-third octave band level of the element and comparing it with the Rw contours. The Rw contour is shifted vertically until the curve falls mainly below the contour and the sum of the deficiencies below the contour over the 16 one-third octave bands does not exceed 32 dB is met.
When the Rw contour is shifted to meet these criteria, the Rw rating is given by the value of the contour at Hz. This uses a sightly different frequency range - Hz versus - Hz for Rw and includes a limitation of no point more than 8dB below the rating curve in any one-third-octave band. In general, the two ratings give either the same number or only points difference, so they can be used fairly interchanged. Acoustics Laboratory and Facility Our laboratory consists of two connecting reverberation rooms.
The source and receiving are of 90m3 and 75m3. The receiving room is built on an isolation box to ensure efficient vibration and sound isolation. The building specimen was installed in the 10m2 opening.
The support frame for the specimen was fixed to a concrete platform, which was isolated from both source and receiving rooms.
This is to reduce the transmission of structure-borne vibration from the structure of the source room. Laboratory Dimension: View. To ensure the highest accuracy and precision of our measurement, our equipment is complied with the requirements of accuracy classes 0 or 1 defined in IEC and IEC Certify Your Buildings Specimen Once finished laboratory measurement, a detail measurement report , and a Certification that relevant to the Sound Reduction Index RW of the tested buildings specimen will be issued.
People can refer to this Certification to consult the acoustics performance of your building products. Supersedes BS Also known as BS Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards. Website: www. Sample Specification Download sample specifications and see what's possible with NBS Chorus Case studies Find out how our customers use our software and services Authors Meet some of our specialists and contributors Training Interactive training courses and educational material, to help you get the most from NBS software tools Downloads and updates Download the latest versions of our software and find out about the latest updates to content About NBS Our Vision, Mission and Values Newsroom All the latest NBS and industry news and stories.
Laboratory measurement of airborne sound insulation of building elements AMD No longer current but cited in Building Regulations guidance. This document Newer versions Older versions. Find out more. Specifies a laboratory method of measuring the airborne sound insulation of building elements such as walls, floors, doors, windows, facade elements and facades, except those classified as small building elements. Your Alert Profile lists the documents that will be monitored.
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