## Simplified measurement of the reduction of transmitted impact noise by floor coverings

Ole-Herman Bjor, Norsonic AS

ohbjor@norsonic.com

Laboratory measurement of the reduction of transmitted impact noise by floor coverings on heavyweight and lightweight standard floors are specified in the International standards ISO 140-8 and ISO140-11, respectively. The laboratory arrangement consists of two rooms of about 50 m3 each, one on top of the other, separated by a standardized floor. Based on research from Physicalisch Techniches Bundesanstalt (PTB), a simplified method for heavyweight floors is now proposed for International standardization by ISO. The floor covering to be measured is placed on a slab of concrete of size 1,2 m x 0,8 m, and 0,2 m thick. A normal tapping machine is used for the excitation and the vibration level is measured with and without the floor covering. The paper describes the method and the instruments needed.