摘要
室内声学中部分镜像反射和部分扩散反射模型是一种方便的界面声能散射现象的表示方法，声能扩散系数的确定成为研究界面声散射的一个关键。至今界面平均声能扩散系数的确定方法很少。Ｖｏｒｌａｎｄｅｒ提出了一种应用相关原理测量声能扩散系数的方法，但该方法忽略了直达声的相关性，存在缺陷。本文提出了一种新的声能扩散系数近似计算方法，将直达声和第一次强反射的影响考虑在内，克服了Ｖｏｒｌａｎｄｅｒ方法的不足。同时，借助数字测量技术，开发了实验测量系统。实验结果表明，本方法较Ｖｏｒｌａｎｄｅｒ方法有明显的改进。
The partly specular reflection and partly diffusion reflection model is a convenient way to express the phenomena of surface sound energy scattering in room acoustics. Sound energy diffusion coefficient becomes a key factor to study surface scattering. But there have been very few means for determining the average sound energy diffusion coefficient. Vorlander proposed such an easy one based on the interrelating principle. However, his mean ignored the interrelation from direct sound, in which defect is present. This paper suggests a new approximate mean for calculating sound energy diffusion coefficient, including direct sound and first strong reflections. Therefore, Vorlander's defect is overcome. In addition, with the aid of digital measuring technology, a relevant measuring system was developed. The experiment result shows that the mean in this paper is improved much than Vorlander's.
出处
《声学学报》
EI
CSCD
北大核心
2000年第3期201-210,共10页
Acta Acustica
基金
国家自然科学基金
南京大学近代声学国家重点实验室开放课题!(9806号)
