A general description of measurement method for sound absorption and surface impedance of materials using ensemble averaging
Abstract
Sound absorption characteristics of materials are important for acoustical researches as well as for practical designs. Various measurement methods have been proposed in this research work for sound absorption characteristics. Some of them are standardized in the International Organization for Standardization(ISO) and in the Japanese Industrial Standards (JIS). There are two well-known methods of laboratory measurement of absorption, one is the “reverberation room method” and the other is the “tube method”. However, these two methods have several drawbacks and disadvantages respectively, as they are not suitable for “in-situ” measurement. Furthermore, sufficient amount of impedance database has not yet been accumulated to meet the necessity for constructing boundary conditions of wave-based room acoustical simulations. To overcome the situation, the authors have presented a method utilizing “ensemble averaging”, namely the “EA method”. There are two types of EA methods. One uses two-microphones and the other uses a pressure-velocity probe (Microflown PU-sensor). Herein, an overview of the EA method is described.
- Publication:
-
Journal of Physics Conference Series
- Pub Date:
- August 2018
- DOI:
- 10.1088/1742-6596/1075/1/012069
- Bibcode:
- 2018JPhCS1075a2069S