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首页> 外文期刊>Applied Acoustics >Reproducibility of sound absorption and surface impedance of materials measured in a reverberation room using ensemble averaging technique with a pressure-velocity sensor and improved calibration
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Reproducibility of sound absorption and surface impedance of materials measured in a reverberation room using ensemble averaging technique with a pressure-velocity sensor and improved calibration

机译：使用带有压力传感器的整体平均技术和改进的校准技术，在混响室内测量的材料的吸声和表面阻抗的再现性

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The authors have been developing a method using pressure-velocity sensors (pu-sensors) to measure the absorption coefficient and surface normal impedance of materials using ensemble averaging:EApumethod. The improvement of geometrical configurations for pu-sensor calibration using an acoustic tube is presented first. Because no clear guideline for pu-sensor positioning in acoustic tube has been reported to date, such improvement is important. Moreover, it enablesEApumethod measurement to be conducted properly at frequencies region up to 3000 Hz. The tube has two openable hard end-walls that help us to make inside humidity conditions similar to those of the outside room and to realizing a one-dimensional sound field at calibration. With such improvements and with consideration of humidity, a round robin test usingEApumethod was conducted in three reverberation rooms to prove the reproducibility of measurements of absorption characteristics of glass-wool and needle felt. Results revealed excellent agreement of absorption coefficient values for reverberation rooms at frequencies of 100–3000 Hz. Results also demonstrated that the maximum difference of absorption coefficient values is less (almost equal or less than half) of those found in the authors’ earlier study of the 125–1250 Hz frequency region.
机译：作者一直在开发一种使用压力速度传感器（pu传感器）的方法，该方法使用集合平均：EApu方法来测量材料的吸收系数和表面法向阻抗。首先介绍了使用声管对pu传感器校准的几何配置的改进。由于迄今尚无关于在声管中放置pu传感器的明确指南，因此这种改进很重要。而且，它可以使EApumethod测量在高达3000 regionHz的频率范围内正确进行。该管具有两个可打开的硬端壁，可帮助我们使内部湿度条件类似于室外环境，并在校准时实现一维声场。经过这样的改进并考虑到湿度，在三个混响室中使用EApumethod进行了循环测试，以证明玻璃棉和针刺毡的吸收特性测量结果的可重复性。结果表明，在100–3000 Hz频率下，混响室的吸收系数值具有极好的一致性。结果还表明，吸收系数值的最大差值小于作者先前对125–1250 Hz频率范围的研究中发现的值（几乎等于或小于一半）。

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