A basic study on incidence directivity analysis using multipole and local expansions

Acoustical science and technology

article

Yosuke Yasuda¹  Takayuki Masumoto²  Naohisa Inoue³  Tetsuya Sakuma⁴ 

[1] Kanagawa University;Cybernet Systems Co., Ltd.;Maebashi Institute of Technology;The University of Tokyo

关键词: Incidence directivity;    Plane wave expansion;    Multipole expansion;    Local expansion;    FMBEM;   

DOI  :  10.1250/ast.43.77

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

The directivity of incident sound (incidence directivity) is important when evaluating the diffuseness of rooms and the effectiveness of sound diffusers/absorbers. There is an approach to evaluate incidence directivity using the plane wave expansion (angular spectrum [1]), and recently, this approach has been applied to the evaluation of isotropy in reverberation rooms [2] and the evaluation of oblique incidence sound absorption coefficients [3], for example. On the other hand, to calculate a reliable incidence directivity using the plane wave expansion, it is essential to clarify various types of numerical error and the relationship between the calculated incidence directivity and the corresponding sound-receiving region.

【 授权许可】

Unknown