扩散吸声体近场散射能量分布的理论预测

扩散吸声体在扩散声音的同时还具有一定的吸声效果,可以方便地用于控制诸如听音室、录音棚等小房间的音质。当自由场中扩散吸声体附近流体受100 Hz单频振动激励时,在其振动的半个周期内,以可压缩流体为模型,考虑空气的粘性及热传导性,引入流体力学中的纳维-斯托克斯方程作为复杂声场的控制方程,采用时间分离法得到其数值解,分析了其表面附近流场的瞬态响应,导出对应的速度场以及声压场,从而得到其散射能量在近场的分布规律。

Theoretical Prediction of the Scattered Energy Distribution in the Near Field of Diffsorbers

Due to its diffusion and coexistent absorption property, diffsorber can be chosen to adjust the acoustics of small rooms such as listening rooms, recording studios conveniently. Considering the vibration of air surrounded a dlffsorber, when it is stimulated by 100 Hz single-frequency oscillation, within a half cycle, based on hydrodynamics and making use of Navi- er-Stokes equations as governing equations to consider the air viscosity and heat transportation, a model for analyzing the in- tricate sound field near the surface of a typical diffsorber is made. The transient response of sound field is achieved by solving such equations via a time-splitting method. Consequently, the relate vibration velocity field as well as the pressure field can be acquired and the scattered energy distribution then would be derived.