The sound insulation of façades at frequencies 5–5000 Hz

Autor: Jukka Keränen, Jarkko Hakala, Valtteri Hongisto
Rok vydání: 2019
Předmět:
Zdroj: Building and Environment. 156:12-20
ISSN: 0360-1323
Popis: The sound pressure level (SPL) of environmental noise inside a dwelling is usually calculated by subtracting the outdoor-indoor level difference (DL) of the facade from the outdoor SPL. However, there is very little DL data available below 50 Hz. The purpose of our study was to determine the sound reduction index (SRI) within 50–5000 Hz according to ISO 16283-3 and the DL within 5–200 Hz for a broad range of different vertical facade constructions. The statistical distributions of SRI and DL were determined. Thirteen residential buildings involving twenty-six facade constructions were measured. A special infrasound loudspeaker was built to provide sufficient SPL within 5–20 Hz. The indoor SPL was measured in four corner and five central positions in the receiving room. The inter-facade differences of SRI within 50–5000 Hz were 17–36 dB. The differences for DL were smaller within 5–200 Hz: 12–30 dB in corner positions and 14–30 dB in central zone positions. The DL values measured in corner positions were significantly lower than the DL values measured in central zone positions within 40–200 Hz. Our DL results in corners were in agreement with three previous Danish studies only at a few one-third octave bands within 8–50 Hz. Our values were, in general, larger below 50 Hz. This study is unique because we were able to measure DL values down to 5 Hz using loudspeaker excitation. The statistical estimates can be used to assess the SPL of environmental noise indoors when the SPL outdoors is known.
Databáze: OpenAIRE
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