Measurement Method on the Absorption Coefficient of the Material with Large Dimension Based on Two-Microphone

Abstract:

This paper is researching on methods to get the absorption coefficient of the material with large dimension. The absorption coefficient can be got by the source mirror method which the FRF of two pressure signals near the material surface in point source field is obtained. The influence of the factors such as the source height, the material size, horizontal distance and positions of two microphones on the accuracy was analyzed by experiments and the indirect boundary element method. The results from this method discussed in this paper are basically the same with that from the impedance tube.

• Periodical: Applied Mechanics and Materials (Volumes 490-491)
• Pages: 1584-1587
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.490-491.1584
• Online since: January 2014
• Authors: Ran Li, Tao Feng, Jing Wang, Yao Wu
• Keywords: Absorption Coefficient, Large Specimen Material, Source Mirror Method, Two-Microphone

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