Abstract
Previous research on the standard tapping machine has shown that the impact on a floor depends strongly on the combined system of floor and tapping hammers. This means that in general, a particular measure to reduce the impact sound pressure level can be advantageous with one impact source and disadvantageous with another. Conversion from one impact source to another has to be made for each floor individually, provided there is a sufficient knowledge of the dynamic properties of the source and floor. So, if the standard tapping machine is to be used to characterise a floor with respect to walking noise, the only simple way out of the problem is to make it ‘behave like a walker’. That means it should have the same source impedance. Investigations at the Fraunhofer-Institut für Bauphysik Stuttgart showed that this could be achieved by small modifications to the standard tapping machine. Comparisons using a concrete floor and a wooden joist floor have proved that results using such a modified tapping machine are much closer to walking noise than the results using the standard tapping machine.
Highlights
This article is the continuation of a former publication about “Impact sound insulation of timber floors: interaction between source, floor coverings and load bearing floor” [1]
Previous research on the standard tapping machine has shown that the impact on a floor depends strongly on the combined system of floor and tapping hammers. This means that in general, a particular measure to reduce the impact sound pressure level can be advantageous with one impact source and disadvantageouswith another
Comparisons using a concrete floor and a wooden joist floor have proved that results using such a modified tapping machine are much closer to walking noise than the results using the standard tapping machine
Summary
This article is the continuation of a former publication about “Impact sound insulation of timber floors: interaction between source, floor coverings and load bearing floor” [1]. The noise of the standard hammer machine could be converted into walking noise just by adding a known correction to the measured (hammer) impact sound pressure levels. There may be some limited areas, where there is an approximate simple relation between hammer and walking noise, that is when the floor structure can be represented as a linear system with a much greater impedance than the source.
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