低频室内声散射计算机模拟方法  

Method of modeling sound scattering in rooms at low frequencies

作　　者：曾向阳[1] Claus Lynge Christensen Jens Holger Rindel 

机构地区：[1]西北工业大学航海学院,西安710072 [2]丹麦科技大学(DTU)声学技术系

出　　处：《声学学报》2006年第5期476-480,共5页Acta Acustica

基　　金：国家自然科学基金(10404021);西北工业大学英才计划基金

摘　　要：近年来,声散射的模拟成为室内声场计算机模拟研究的重点。现有的方法一般是依据壁面性质(结构、粗糙度等),利用经验确定散射系数,并基于该系数来模拟室内散射声能的分布。这种方法在低频情况下的精度较差,主要原因是忽略了在低频声场中起重要作用的波动现象。为此,本文提出一种新的计算壁面散射的模型,该模型既可考虑壁面上产生的散射声能,又可计算因壁面边缘衍射而产生的散射声能。文中通过模拟和实测数据的对比,分析验证了该模型的有效性,并给出了表面散射系数的取值规则。Modeling of scattering has become a research hotspot in the area of room acoustics computer simulation. Current methods mainly consider the surface property like structure and roughness, and cannot obtain accurate results at low frequency bands. The neglect of edge diffraction is one of the most important reasons. In this paper, an approach that combines modeling surface scattering and scattering caused by edge diffraction, has been presented. The predicted and measured acoustic parameters have been compared in order to validate the algorithm. The rules for determining surface scattering coefficients have also been recommended.

关 键 词：计算机模拟 模拟方法 室内声场 低频声场 声散射 散射系数 经验确定 波动现象 

分 类 号：O422.3[理学—声学]