首页> 外文会议>International Congress on Sound and Vibration >REPRODUCIBILITY OF SOUND ABSORPTION AND SURFACE IMPEDANCE OF MATERIALS MEASURED IN A REVERBERATION ROOM BY ENSEMBLE AVERAGING TECHNIQUE USING A PRESSURE-VELOCITY SENSOR
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REPRODUCIBILITY OF SOUND ABSORPTION AND SURFACE IMPEDANCE OF MATERIALS MEASURED IN A REVERBERATION ROOM BY ENSEMBLE AVERAGING TECHNIQUE USING A PRESSURE-VELOCITY SENSOR

机译:通过使用压力 - 速度传感器通过集合平均技术在混响室中测量的材料吸收和表面阻抗的再现性

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In earlier papers, the developments of measurement method with a pressure-velocity sensor (pusensor) for measuring absorption coefficient and surface normal impedance of materials using ensemble averaging: EA method have been researched. The present study proposes a reproducibility of sound absorption and surface impedance of materials measured in a reverberation room by ensemble averaging technique using a pressure-velocity sensor. A round robin test measurements by experimenting the sound absorption characteristics in three reverberation rooms is conducted. The target frequency range is 200 - 2500 (Hz). The measurement results of two materials are reported here. In an early stage, EA method was targeted mainly at constructing impedance boundary conditions of sound fields that used in numerical methods such as finite element method. Therefore, its frequency range was set as 100-1500 Hz. Takin into account the recent progress of computational resources, absorption characteristics in a rather higher frequency region are required. Herein, to raise the measurable frequency upper limit of EA method with a pu-sensor up to 3000 Hz, geometrical improvements are applied to an acoustic tube. The effectiveness of the improvement was confirmed using a series of EA method measurements conducted in three reverberation rooms. In all measurements, relative humidity was monitored carefully based on earlier findings by some of the authors. Using the improved acoustic tube, a series of EA method measurements of the glass-wool panel and a needle felt sheet were conducted in three reverberation rooms at different places with the improved calibration including relative humidity consideration. Those of sound absorption coefficient values are satisfactory in the entire frequency region from 100-3000 Hz, although agreement of impedance values among three different reverberation rooms are fair for frequencies below 200 Hz. The results presented here confirm the reproducibility of EA method using improved pu-sensor calibration with consideration of relative humidity.
机译:在早期的论文中,研究了用于测量吸收系数和使用集合平均值的吸收系数和表面正常阻抗的测量方法的开发:研究了EA方法。本研究提出了通过使用压力速度传感器的集合平均技术在混响室中测量的材料的吸声和表面阻抗的再现性。通过试验三个混响室中的吸音特性来进行循环测试测量。目标频率范围为200 - 2500(Hz)。这里报告了两种材料的测量结果。在早期阶段,EA方法主要用于构建用于数值方法的声场的阻抗边界条件,例如有限元方法。因此,其频率范围设定为100-1500 Hz。 Takin考虑到最近的计算资源进度,需要在相当高的频率区域中的吸收特性。这里,为了提高具有高达3000Hz的PU传感器的EA方法的可测量频率上限,将几何改进施加到声管。使用三个混响室进行的一系列EA方法测量确认了改进的有效性。在所有测量中,基于一些作者的早期调查结果,小心监测相对湿度。使用改进的声管,在不同地区的三个混响室中进行了一系列EA方法测量,在不同的地方进行了改进的校准,包括相对湿度考虑。声音吸收系数值的整个频率区域在100-3000赫兹的令人愉快的情况下,尽管三个不同的混响房间间阻抗值的协议是公平的,但频率低于200 Hz。这里提出的结果证实了使用改进的PU传感器校准的EA方法的再现性,考虑到相对湿度。

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