Prezelj Jurij, Steblaj Peter, Cudina Mirko
University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia
J Acoust Soc Am. 2014 Jun;135(6):EL338-43. doi: 10.1121/1.4879668.
A technique for in situ measurements of acoustic properties of a fibrous porous material is proposed in this paper. Proposed technique exploits a directivity pattern of a dipole source in its very near field. Theoretical analysis for the proposed technique is based on the Rayleigh integral with a complex reflection included. Results are compared with results of FEM analysis and show that flow resistivity of a porous material placed in the very near field of the dipole source has significant influence on the sound pressure at its ring. Results provide an excellent starting point for the design of the sensor for sound absorption.
本文提出了一种用于原位测量纤维多孔材料声学特性的技术。所提出的技术利用了偶极子源在其近场中的指向性图案。该技术的理论分析基于包含复反射的瑞利积分。将结果与有限元分析结果进行比较，结果表明，放置在偶极子源近场中的多孔材料的流阻对其环向声压有显著影响。研究结果为吸声传感器的设计提供了一个很好的起点。
