Influence of receive room properties on impact sound pressure level measured with heavy impact sources

Autor: Schoenwald, S., Berndt Zeitler, Nightingale, T. R. T.
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Scopus-Elsevier
Popis: One important issue in building acoustics is the testing and rating of the impact sound isolation of floor assemblies. Although the basic principal of impact testing is equal in all standardized test procedures - i.e. the test specimen is excited with a structural source and the resulting sound pressure level is measured in the receive room - there are also major differences. According to ISO 140 the well known tapping machine excites the test specimen with its five dropping steel hammers that produce a steady-state excitation signal. In the receive room the equivalent sound pressure level is averaged over time and space. Normalization of the impact sound pressure level to room volume and to reverberation time allows comparison of measurement results that are measured in different facilities or in-situ. On the other hand, according to JIS 1418 a well-defined small car tire or a rubber ball is dropped from a particular height on the floor assembly. In the receive room the fast-weighted maximum sound pressure level of the sound impulse due to the impact is averaged over several drop and receiver positions. However, in the post processing of the data the properties of the receive room are not taken into account. In a recent study heavy impact tests were done in a test facility that is significantly bigger and has also a much longer reverberation time than rooms in common dwellings. To enable a comparison and transfer of the test results to the impact sound isolation that would be measured in real buildings, the effect of room volume and of reverberation time on the sound pressure level of the impulses is assessed in this paper.
1st EAA: EUROREGIO 2010 Congress on Sound and Vibration: 15 September 2010, Ljubljana, Slovenia
Databáze: OpenAIRE
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