【作者】 怡晓玲；

【导师】 王省哲；

【作者基本信息】 兰州大学 ， 固体力学， 2009， 硕士

【摘要】 压电声波器件是基于压电材料的逆压电效应将电信号转化为机械振动和声波的一类重要的高频声波信号发生器件,其在航空航天、国防、机械、电子领域有着广泛而重要的应用。本论文采用大型商业有限元软件ANSYS,分析了一典型的圆柱壳状压电声波器件的压电-结构-声场耦合特性。在用有限元法进行分析的过程中,我们采用了ANSYS软件中的压电-结构耦合、流-固耦合单元,运用直接耦合分析法给出了不同压电贴片厚度、大小以及外加电压等因素对压电-结构-声场耦合系统的动态响应的影响,并进一步分析了其对器件周围声场、声压的影响等,初步获得了一些器件几何参数对其性能的影响规律曲线。最后文中还对器件内有填充介质以及存在障碍物两种情形下的压电-结构-声场耦合特性进行了数值模拟。更多还原

【Abstract】 Piezoelectricity acoustic wave devices are one of the important high-frequency devices of wave-source that can radiate sound waves into the surrounding air. They work based on anti-piezoelectric effect, which converts electric signal into mechanical vibrations and sound waves. Piezoelectricity acoustic wave devices have a board important applications in the atmosphere of aerospace, defense, machinery and electronics. In this thesis, we analyzed the piezoelectric-structure-acoustic couplings of a cylindrical shaped piezoelectric acoustic wave device using the commercial finite element software of ANSYS.The piezoelectric-structure coupling elements and fluid-solid coupling elements in ANSYS are used during the FEM analysis. The direct coupling method is adopted through our analysis. We take into account the thickness and the size of piezoelectric patches, as well as factors such as the applied voltage which can influence the dynamic response of the piezoelectric-structure-acoustic coupling system and the sound pressure in the air sphere surrounding the device. Results are given in the form of curves which reflect how the geometric parameters influence this device’s capabilities. In the end, we present the simulation and analysis of the piezoelectric-structure-acoustic couplings within mediums in the devices.更多还原