Revision of ISO 717: Why not use impact sound reduction indices instead of impact sound pressure levels?

摘要

In the current edition of ISO 717 airborne and impact sound insulation are described in an oppositional way: Airborne sound insulation is expressed in terms of a 'sound reduction index', impact sound insulation, however, as an 'impact sound pressure level'. The fussiness of two different approaches for comparable properties of building elements is furthermore increased by the duality or mixture of reference curve comparison and A-weighting methods. The implicit and exclusive application of the tapping machine for the impact sound pressure level prevents any flexibility in the impact source characteristics, other than with airborne sound reduction indices, where traffic noise and 'living' noise from the neighbour can be used likewise for building element characterisation. This paper proposes to replace the impact sound pressure level by a new quantity called "impact sound reduction index". A detailed introduction into the background of this paper is given in [1].