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The sound insulation of facades at frequencies 5-5000 Hz

机译：频率下的外墙隔音5-5000 Hz

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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.
机译：居住内部环境噪声的声压级（SPL）通常通过从室外SPL中减去门面的室外室内级别（DL）来计算。但是，在50 Hz以下提供的DL数据很少。我们研究的目的是根据ISO 16283-3和5-200Hz内的DL确定50-5000 Hz内的声音还原指数（SRI），用于广泛的不同垂直立面结构。确定SRI和DL的统计分布。衡量了涉及二十六个外立面结构的十三个住宅建筑。建立了特殊的Infrasound扬声器，以便在5-20 Hz内提供足够的SPL。在接收室中的四个角落和五个中央位置测量室内拼接。 50-5000Hz内SRI间的外立间隔差异为17-36 dB。 DL的差异在5-200Hz：12-30dB的角位置中的12-30dB和中央区域位置的14-30dB。在拐角位置测量的DL值显着低于40-200Hz内的中央区位置测量的DL值。我们的DL导致角落达成协议，仅在8-50 Hz内的几个三分之一八十八个乐队中达成协议。一般而言，我们的价值观较大，低于50 Hz。这项研究是独一无二的，因为我们能够使用扬声器励磁测量DL值下降到5 Hz。统计估计可用于评估在户外户外时室内的环境噪音分开。

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