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Measurement of the low-frequency sound insulation of building components

机译：建筑构件低频隔音的测量

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Attention on sound insulation at very low frequencies is increasing. However, in typical European transmission rooms with a volume of 50-70 m(3) the reproducibility of sound insulation measurements is not satisfactory at frequencies below 100 Hz. The objective of the work described in this paper was to develop a new method of measurement in existing transmission rooms with the best possible accuracy at low frequencies (below 400 Hz). It was aimed to achieve a reproducibility in the frequency range 50-80 Hz not exceeding the reproducibility for the existing ISO 140 method at 100 Hz. This was obtained with a new method of measurement using new principles such as a corner source or moving loudspeaker, microphone positions in the source room close to the test object, an absorbing back-wall in the receiving room, and intensity measurements in the receiving room. The accuracy was estimated from theoretical investigations and measurements on four test objects at four laboratories. With the new method the standard deviation associated with the reproducibility was typically 2-3 dB at 50-80 Hz and around 2 dB at 100-125 Hz. For the existing ISO 140 method the standard deviation is approximately 4-6 dB at 50-80 Hz and around 3 dB at 100-125 Hz, For both methods the standard deviation associated with the reproducibility was in average 1.5-2 dB at 160-400 Hz. The measured sound insulation at very low frequencies was in average lower with the new method than with ISO 140. At 125-160 Hz there was no systematic difference between the two methods. A qualification procedure is proposed for checking each test facility, including the type and position of the sound source, and the efficiency of the applied absorbing material for the back-wall of the receiving room. [References: 17]
机译：在非常低的频率下，对隔音的关注正在增加。但是，在典型的欧洲传输室中，其体积为50-70 m（3），在低于100 Hz的频率下，隔音测量的可重复性并不令人满意。本文所述工作的目的是在现有的传输室中开发一种新的测量方法，该方法在低频（低于400 Hz）时可能具有最佳精度。目的是在50-80 Hz的频率范围内实现可重复性，但不超过现有ISO 140方法在100 Hz时的可重复性。这是通过采用新原理的新测量方法获得的，这些新原理包括转角源或移动扬声器，源室内靠近测试对象的麦克风位置，接收室中的吸收性后墙以及接收室中的强度测量。准确性是根据对四个实验室的四个测试对象进行的理论调查和测量得出的。使用新方法，与重现性相关的标准偏差通常在50-80 Hz时为2-3 dB，在100-125 Hz时约为2 dB。对于现有的ISO 140方法，标准偏差在50-80 Hz时约为4-6 dB，在100-125 Hz时约为3 dB。对于这两种方法，与重现性相关的标准偏差在160-Hz时平均为1.5-2 dB。 400赫兹使用新方法测得的在非常低的频率下的隔音效果平均要比使用ISO 140更低。在125-160 Hz时，两种方法之间没有系统上的区别。提出了一种鉴定程序，用于检查每个测试设施，包括声源的类型和位置，以及用于接收室后壁的吸收材料的效率。 [参考：17]

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