摘要
入射声波激励下非均匀流体介质内部散射声场的重建方法对超声层析成像具有重要意义。以往采用矩量法求解,但该方法全域离散形成的复数满秩矩阵规模随着分辨率与计算精度的提高急剧增大,对算力具有很高的要求,一定程度上限制了其在实际中的应用。为克服上述缺陷,以逐层离散、逐层计算为核心思想,以声散射基本公式与近场声全息理论为基础,推导出逐层计算非均匀流体介质内部散射声场的理论公式并给出对应的几何离散模型。为验证该方法的可行性,以矩量法为参照,对同样的介质模型进行介质内部声场重构仿真。结果表明,逐层算法不仅可以有效地重建非均匀流体介质内部散射声场,且大幅度减小了求解规模。
The reconstruction of scattered soundfields in inhomogeneousfluid media under the excitation of incoming sound waves is of great importance to ultrasonic tomography.In the past,the method of moments was used to solve the problem.However,the size of the complex full rank matrix formed by the method of global discretization increases sharply with the improvement of resolution and calculation accuracy,which has high requirements for computing power and limits its practical application to some extent.In order to overcome these shortcomings,based on the basic formulas of acoustic scattering and near-field acoustic holography,the theoretical formulas for calculating the scattered soundfield in inhomogeneousfluid media layer by layer are deduced and the corresponding geometric dispersion models are given.To verify the feasibility of this method,the internal acousticfield reconstruction of the same media model is simulated with the method of moments as the reference.The results show that the layer-by-layer algorithm can not only effectively reconstruct the scattered soundfield in non-uniform media,but also greatly reduce the solution size.
作者
唐少杰
向宇
石梓玉
TANG Shaojie;XIANG Yu;SHI Ziyu(Key Laboratory of Automobile Componentand Vehicle Technology in Guangxi,Guangxi University of Science and Technology,Liuzhou 545006,China;School of Mechanical and Traffic Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)
出处
《应用声学》
CSCD
北大核心
2023年第6期1235-1243,共9页
Journal of Applied Acoustics
基金
国家自然科学基金项目(51775121)。
关键词
逐层计算
近场声全息
非均匀流体介质内部散射声场
超声激励
Layer by layer calculation
Nearfield acoustic holography
Scattered soundfield in inhomogeneousfluid media
Ultrasonic excitation
