摘要
针对传统边界元法奇异性的固有缺陷,研究一种求解结构辐射声场的间接边界元法。通过在内域虚拟曲面上配置一系列单偶极子源,等效模拟结构外辐射声场,并根据单元体积速度匹配法的边界条件方案,给出数值计算辐射声场的间接边界元模型。结合球冠形辐射器的仿真算例,表明该间接边界元法在求解远场声特性时具有较高的计算效率和精度,为分析设计具有大空间指向性的辐射器提供参考。
Aiming at the inherent singularity of traditional boundary element method, an alternative approach of the indirect boundary element method for computing sound radiation field of structures was studied. The model was established by collocating a series of monopole and dipole sources in the interior virtual surface to equivalently replace the actual acoustic field, and the boundary condition was determined by the volume-velocity matching scheme. Then, a numerical example of a spherical-cap shaped radiator was used to demonstrate the computational effectiveness and accuracy of the current method for analysis of far-field sound radiation characteristics. The presented method can provide a guideline for analysis and design of radiators with wide spatial directivity.
出处
《噪声与振动控制》
CSCD
2013年第2期1-4,共4页
Noise and Vibration Control
基金
国家自然科学基金资助项目(50875259)
海军工程大学基金资助项目(HGDQNJJ033)
关键词
声学
虚拟源强
边界元法
声辐射特性
半声压带宽
acoustics
virtual source intensity
boundary element method
sound radiation characteristic
semi-bandwidth of sound pressure
