扩散吸声体的优化设计(英文)

Research on the Optimization of Diffsorbers

在建筑声学工程设计中,特别是在试听室、录音棚、演播室等小型房间的条件下,既要获得良好的声扩散,又要有足够的吸声效果.由于空间有限,因此需要设计不同的扩散吸声体.过去20年来,对扩散吸声体的研究已不再局限于改变其几何构型方面,在其他方面也获得了长足的进展.文中在前人对声吸收和声扩散研究的基础上,结合数论中的伪随机理论及物理学中的分形理论,发展了理论分析方法,提出了新的优化设计手段,并由此设计了各种具不同吸声效果的扩散吸声体文中还对所设计的吸声体进行了实验研究,并对其实际应用进行了探讨.

In the architectural acoustics in engineering, the sound fields that have an insufficient degree of diffusion or the rooms that are lack of sound absorption are often problems to acousticians, especially in small rooms like critical listening rooms, sound recording studios and studio monitor rooms. As there is no enough space to utilize both the diffusion and the absorption, scattering surfaces with specified sound absorption, namely the ＂ diffsorbers＂, is necessary to design.. In the past two decades, great progress in diffsorbers design had been made, not only in the aspects of surface shapes, but also in other fields. On the basis of the known knowledge of sound absorption and sound diffusion, and by utilizing the pseudo-random theory of number theory as well as fractal theory in physics, this paper develops a theoretical analytical method to design diffsorbers and presents a new optimization procedure to produce various diffsorbers with different absorptions. In the mean time, experimental researches on these diffsorbers are carried out, and the corresponding practical application is also discussed.