声学.用声强进行建筑物和建筑构件的隔声测量.第3部分:低频率实验室测量

[中文适用范围]： 总则 ISO 15186 的本部分规定了确定建筑构件低频降噪指数和构件归一化声级差的声强方法。 该方法在典型测试设施中的再现性明显优于 ISO 140-3、ISO 140-10 和 ISO 15186-1。 结果更独立于实验室的房间尺寸，并且更接近于在体积大于 300 m 的房间之间测量的值。 ISO 15186 的这一部分适用于 50 Hz 至 160 Hz 的频率范围，但主要适用于 50 Hz 至 80 Hz 的频率范围。 注：对于表面有厚多孔吸收体的元件，建议的频率范围为 50 Hz 至 80 Hz。 ISO 15186-1 和 ISO 15186-3 方法之间的主要区别在于，ISO 15186-3 中 a) 声源室的声压级是在靠近测试样本表面的位置测量的，b) 与测试样本相对的表面接收室中的测试样本具有高度吸音性，并将房间声学转换为具有高于最低截止频率的多个传播交叉模式的管道。 ISO 15186-3 方法得出的结果可以与 ISO 140-3 和 ISO 15186-1 方法相结合，产生频率范围 50 Hz 至 5 000 Hz 的数据。 2 精度 对于所有频率，该强度方法的再现性估计等于或优于 ISO 140-3 在 100 Hz 下的方法。 附录 B 给出了使用 ISO 15186 本部分和 ISO 140-3 的方法获得的数据的一些比较。 [外文原描述]： ISO 15186-3:2002 specifies a sound intensity method to determine the sound reduction index and the element-normalized level difference of building elements at low frequencies. This method has significantly better reproducibility in a typical test facility than those of ISO 140-3, ISO 140-10 and ISO 15186-1. The results are more independent of the room dimensions of the laboratory and closer to values that would be measured between rooms of volume greater than 300 m 3 . ISO 15186-3 is applicable in the frequency range 50 Hz to 160 Hz but is mainly intended for the frequency range 50 Hz to 80 Hz. NOTE For elements faced with thick, porous absorbers, the recommended frequency range is 50 Hz to 80 Hz. The main differences between the methods of ISO 15186-1 and ISO 15186-3 are that in ISO 15186-3 the sound pressure level of the source room is measured close to the surface of the test specimen, and the surface opposite the test specimen in the receiving room is highly absorbing and converts the room acoustically into a duct with several propagating cross-modes above the lowest cut-on frequency. The results found by the method of ISO 15186-3 can be combined with those of ISO 140-3 and ISO 15186-1 to produce data in the frequency range 50 Hz to 5 000 Hz. The reproducibility of this intensity method is, for all frequencies, estimated to be equal to or better than that found with the method of ISO 140-3 at 100 Hz. Some comparisons of data obtained with this part of ISO 15186 and with ISO 140-3 are given for information.