Acusttel - I+D+i - Transmission field cells

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	R&D projects
	semianechoical cell
	transmission field cells
	Absorption coefficient
	Interior sonority

The normalised field testing cells allow us to compare different sound insulation solutions in the same normalised conditions (surfaces, emitter and receivre volumes, laterales transmission losses) and in the typical configuration of a building, so that the results are the most approximated to the insulation in a real building.

The tests realised in the transmission cells according to laboratory testing methods present the inconvenience of being performed under ideal conditions, without lateral transmissions any coupling between emitter and receiver rooms. Thus, the results obtained can not be extrapolated to normal conditions in a real building for the following reasons:

- In a building, the inferior and superior floor common to two dwellings is the same, with the resulting flanking sound insulation loss.
- The lateral walls, perpendicular to the element to be tested, are not concrete walls, but stairs or façade elements, with the resulting flanking sound insulation loss.

- The sound insulations are much more limited in a building than in laboratory transmission cells. Consequently, the differences founded between two systems in a laboratory test are not necessarly representative of the situation in a real building.

That is why it is necessary to perform some tests in field transmission cells, in order to adapt the solutions to the legal requirements and have a comparative result more realistic of the sound insulation to be obtained when the proposed solution is built.

The transmission field cells allow us to compare a given acoustical solution with different configurations of lateral (vertical and horizontal) unions, in order to verify its behaviour combined with the different configurations, that can be founded in a real installation.