基于有限元方法的超声波仿真研究

针对超声波传播的瞬态问题,提出了一种基于多物理场耦合仿真方法。分别对超声波在流体、各向同性材料、各向异性材料中传播的问题以及压电材料作为声源的问题进行了仿真,并与理论结果进行了对比,结果表明该方法能够较好的仿真超声波传播的问题；在各向异性材料中,不同传播方向的波速不同,某一传播方向纵波速度高,则该方向横波传播速度低,反之亦然；压电材料作为声源时,激励电信号频率与压电材料谐振频率相同或接近时,产生的超声波杂波较少,因此激励电信号频率的选择应该以压电材料的谐振频率为参考。

Research of Ultrasonic Simulation Based on FEM

Aiming at ultrasonic propagation transient problem, a simulation method based on multi-physical field coupling is proposed. The properties of transient wave propagation in fluids, isotropy materials, anisotropy materials and piezoelectric are modeled and simulated, and results of simulation are compared with the theoretical results. It shows that ultrasonic propagation transient problem can be solved by this method; the wave speed of different direction in anisotropy materials is different, and longitudinal wave speed is high and shear wave velocity is low in a certain direction, and vice versa. Clutter is less when ultrasonic wave is produced by the piezoelectric materials and the frequency of excitation signal is the same or near the resonant frequency of piezoelectric material,so the frequency of excitation signal should be referenced by resonant frequency of piezoelectric materials.