BS ISO 20189:2018 download free.Acoustics — Screens, furniture and single objects intended for Interior use — Rating of sound absorption and sound reduction of elements based on laboratory measurements.
The interior design industry is progressing rapidly, and the acoustic characteristics of products have become an Important technical aspect In the design of new products. Currently, interior design products are generally not well delined in terms of their acoustic characteristics, often leading to confusing and misleading product specifications and marketing materials. Further, it Is often unclear how a product’s reported acoustic characteristics are to be applied to determine its acoustic Impact in a furnished room.
BS ISO 20189 is Intended to clarify the acoustic characteristics, and their application, for various interior design products. This is accomplished by a standardized test methodology for the measurement of sound absorption, and defining when an interior product is to be considered as a single object.
BS ISO 20189 is intended to facilitate the measurement and evaluation procedure for any interior product currently on the market. fly using it, different interior design products can be compared to each other in an equal manner. Additionally, product acoustic characteristics evaluated according to BS ISO 20189 can be applied for room acoustic modelling and calculations.
I Scope
BS ISO 20189 specifies how screens, furniture and single objects intended for interior use are assessed with regard to sound absorption and specifies the evaluation of sound attenuation br floor screens. It also specifies under which circumstances various interior products for offices, schools and other public spaces are considered as plane absorbers or as discrete single obiects. A product considered as a single oblect and intended for interior use is measured according to ISO 354 and evaluated by its equivalent sound absorption area or object sound absorption coefficient in octave bands. BS ISO 20189 defines interior products and single objects and it comprises additional information regarding measurements and assessment of single objects.
The sound absorption as specified In BS ISO 20189 can he used to calculate:
a) reverberation time characteristics in rooms;
b) room acoustic parameters using ray tracing software.
2 Normative references
The following documents are referred to in the text In such a way that some or all ol their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3.13
weighted sound reduction index
R
frequency weighted value evaluated from the frequency-dependent sound reduction indexes (jj2)
Note 1 to entry: The weighting procedure is described in 1511 717-1.
Note 2 to entry: Annex F gives additional Inlormation on which weighted sound reduction Index It Is reasonable
to strive for depending on the screen height.
4 Methods to measure and evaluate various Interior acoustic products
4.1 Single objects
4.1.1 General
Single objects are typically floor screens, desk screens, chairs, stools, desks, sofas or any other object that can absorb, scatter or spread sound within a room. They can also be unique products intended for wall application or for interior decoration, which have an added room acoustic effect.
Single objects are normally measured, evaluated and declared with regard to their sound absorption characteristics. For specific product categories or mounting conditions, additional acoustic characteristics may be measured and evaluated (see j and j).
4.1.2 Single object sound absorption
The sound absorption of a single object is measured according to ISO 354 while additional specified mounting conditions are given In Annex E. The sound absorption of the object shall be given as the equivalent sound absorption area. Ath), in the 1/3-octave bands between 100 Hz and 5 000 Hz and in
4.3.1 General
A floor screen is a room divider normally used in large rooms to provide sound attenuation between workstations or different zones with several workstations. A floor screen can have different heights and is normally comprised of several units standing on the floor, connected to create a space separation around one or more workstations. Single screen units can occur but are then not regarded as a screen but instead as a single oblect. A floor screen is normally higher than 1.4 m but lower than room height. leaving some space between the ceiling and Its top.
Floor screens can be measured, evaluated and declared with regard to their sound absorption characteristics, their screen sound attenuation and sound Insulation (sound reduction Index).
4.3.2 Floor screen sound absorption
The sound absorption of a floor screen is measured according to 4…L2 and evaluated according to
FormuLa (1).
4.3.3 Floor screen sound attenuation
The sound attenuation of a floor screen is given as and according to Iso 10053. The values are strongly dependent on the actual screen height and connections between units, and are therefore only applicable for the screen height and the connection setup that were valid during the measurements.
4.3.4 Floor screen sound insulation
The sound insulation of a floor screen Is denoted with the frequency-dependent sound reduction index, R. and with the weighted sound reduction index. R. The sound reduction index is measured In a laboratory where the screen construction is mounted in the entire test openingaccording to ISO 10140-2. The sound reduction index Is measured for the entire construction Including connections to floor, walls and between individual screen elements. Connections between screen elements shall be performed as It Is done in reality (normally). No extra sealing Is allowed between adjacent screen elements. An edge of maximum Scm is allowed around the test specimen in order to simplify the mounting.
The sound reduction shall be measured in the 1/3-octave bands between 100 Hz and 5 000 Hz. The frequency range may be extended in order to comprise frequencies between 50 Hz, if possible.
4.6 Other single objects
Any other single object such as lamps, lighting devices, others 3D-objects, art objects. etc. that cannot
be classified as defined in 42 to £5 shall be treated according to Ui.
5 Statement of results
5.1 Results for sound absorption
The test specimen including the interior product shall be described, including Its mounting conditions, It shall be clearly stated how the sound absorbing surfaces (if any) and frames are distributed on the tested objects.
The test conditions shall be indicated, including the number of obiects in the test specimen and their locations in the reverberation chamber. The volume of the reverberation chamber and Its treatment with dillusors shall be given In the report, as described In 1St) 354. Mounting conditions for various test specimen are given in Annex E.
The test specimen shall meet the requirements for sample sizes in ISO 354. II any deviations occur, an explanation shall be given as to why they have been made.
can he evaluated for the product, if applicable. The use of ap and aw is only allowed for single objects that are tightly connected to form a surface greater than 10 m2. as specilled In 4.5.
5.2 Results for floor screen sound attenuation
The test specimen Including the interior product shall be described, including measurement and mounting preconditions according to the rules given in ISO 10053. All connections between screen elements and mounting conditIons shall be presented.
Any deviations from ISO 10053 shall he reported including an explanation on why they have been made.