| 报告题目 | Simulation of acoustic wave propagation: from architectural acoustics to biomedical ultrasound |
| 报告人 | Prof.Yun Jing |
| 报告人单位 | North Carolina Stat University, USA |
| 报告时间 | 2013-05-27 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | 报告摘要：
This talk focuses on different numerical methods for simulation of acoustic wave propagation in the areas of architectural acoustics and biomedical ultrasound. For architectural acoustics, the sound field modeling in long spaces is formulated using 1-D transport equations. Experiments obtained from a long room scale model are used to verify the transport equation models. In addition to transport equation models, the use of a diffusion equation to model sound field in various spaces is investigated. Particularly, a modified boundary condition to improve the room-acoustic prediction accuracy of the diffusion equation model is introduced. Simulated and experimental data in a flat room scale model are compared to verify the numerical model. The diffusion equation model is also applied to the study of acoustics in coupled rooms. It will be shown that time-dependent sound energy flows in coupled-room systems experience feedback in cases where the dependent room is more reverberant than the source room. For biomedical ultrasound, two spectral methods (angular spectrum approach and k-space method) are investigated for nonlinear wave propagation based on the Westervelt equation. Spectral methods are superior over conventional FEM and FDTD method due to their low dispersion errors even when the mesh is relatively coarse, therefore is inherently suitable for large-scale biomedical ultrasound propagation. To show the application of the spectral method, the k-space method with a coarse spatial resolution is implemented for the phase correction for transcranial focusing. A sharp focus in the brain is found both in simulation and experiment after the phase correction. |
