Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, People's Republic of China.
J Acoust Soc Am. 2010 Oct;128(4):1617-22. doi: 10.1121/1.3474896.
The computational details related to calculating the acoustic radiation force on an object using a 2-D grid finite-difference time-domain method (FDTD) are presented. The method is based on propagating the stress and velocity fields through the grid and determining the energy flow with and without the object. The axial and radial acoustic radiation forces predicted by FDTD method are in excellent agreement with the results obtained by analytical evaluation of the scattering method. In particular, the results indicate that it is possible to trap the steel cylinder in the radial direction by optimizing the width of Gaussian source and the operation frequency. As the sizes of the relating objects are smaller than or comparable to wavelength, the algorithm presented here can be easily extended to 3-D and include torque computation algorithms, thus providing a highly flexible and universally usable computation engine.
本文介绍了使用二维网格有限差分时域方法（FDTD）计算物体上声辐射力的计算细节。该方法基于通过网格传播应力和速度场，并确定有和没有物体时的能量流。FDTD 方法预测的轴向和径向声辐射力与通过散射方法的分析评估得到的结果非常吻合。特别是，结果表明通过优化高斯源的宽度和操作频率，可以实现对钢圆柱在径向方向的捕获。由于相关物体的尺寸小于或与波长相当，因此这里提出的算法可以很容易地扩展到 3D 并包括扭矩计算算法，从而提供了一个高度灵活和通用的计算引擎。
