室内粗糙表面声散射体掠入射角度散射估计

发布时间：2018-07-01 14:05

本文选题：散射体 + 掠入射　；参考：《声学学报》2017年05期

【摘要】：针对经典边界元方法对掠入射角度下的散射估计精度较低的问题,发展了一种边界无网格模型.此模型将散射体视为具有无限延伸的形式,避免了经典边界元法中薄板形式所导致的声压差问题,而且更加符合实际房间中散射体的存在形式;模型利用无网格算法实现数值仿真,可对任意表面形状特别是曲面散射体具有更高的仿真精度。利用边界无网格模型计算了不同形状散射体的散射系数及散射声场,并将结果与解析方法、测量实验进行了对比.对比结果表明,边界无网格模型可以准确预测散射体的散射性质,特别是对掠入射角度的估计要优于经典边界元法.研究结论可应用于室内声学散射体特征预测及优化设计,对提高声场扩散及室内音质水平具有重要意义.
[Abstract]:A meshless boundary model is developed to solve the problem of low accuracy of classical boundary element method (BEM) in estimating scattering at grazing incidence angle. In this model, the scatterer is regarded as an infinitely extended form, which avoids the acoustic pressure difference problem caused by the thin plate form in the classical boundary element method, and is more consistent with the existing form of the scatterer in the actual room. The model uses meshless algorithm to realize numerical simulation, which can obtain higher simulation accuracy for any surface shape, especially for surface scatterers. The scattering coefficients and scattering sound fields of different shapes are calculated by using the boundary meshless model, and the results are compared with the analytical method. The results show that the boundary meshless model can accurately predict the scattering properties of scatterers, especially the estimation of grazing incidence angle is superior to the classical boundary element method. The results can be applied to the prediction and optimization design of indoor acoustic scatterers. It is of great significance to improve the diffusion of sound field and the level of indoor acoustic quality.
【作者单位】：西北工业大学航海学院环境工程系;
【基金】：国家自然科学基金项目(11604266,11374241) 民机科研项目(MJ-2015-F-044) 航空科学基金项目(20151553021)资助
【分类号】：O422.5

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