噪声与振动控制Issue(6)：140-143,147,5.DOI:10.3969/j.issn.1006-1335.2014.06.031
几何绕射理论下楔形障碍物衍射
Study on Wedge-shaped Obstacle Diffraction Based on Geometrical Theory of Diffraction
摘要
Abstract
Geometrical theory of diffraction is used to study the diffraction rules of wedge-shaped obstacle with different angles and sound frequencies. A wedge-shaped obstacle with 90° wedge angle is taken as a typical example to simulate sound propagation and attenuation of wedge-shaped buildings. The relation of the insertion loss and the wedge angle of the obstacle and the sound frequency are obtained. The result of simulation is compared with the Maekawa’s measurement data and the accuracy of the simulation is analyzed. Considering the sheltering effect of the in-situ wedge-shaped buildings, sound attenuation amid the buildings is calculated with the help of spatial subdivision and beam tracing method when the sound path is generated. The results show that the sound attenuation increases with the decreasing of the wedge angle and increasing of the sound frequency. And the geometrical theory of diffraction can be applied to the sound diffraction calculation amid buildings in a large area.关键词
声学/几何绕射理论/衍射/90°楔角/斜顶建筑物Key words
acoustics/geometrical theory of diffraction/diffraction/90° wedge angle/pitched roof building分类
通用工业技术引用本文复制引用
王海波,余志,蔡铭..几何绕射理论下楔形障碍物衍射[J].噪声与振动控制,2014,(6):140-143,147,5.基金项目
国家高技术研究发展计划(863计划2012AA112311)国家自然基金(51178476) （863计划2012AA112311）
