摘要
目的:基于声子晶体带隙理论,对换能器的前盖板进行了优化设计,使换能器具备良好的纵向振动性能。方法:将传统的夹心式压电换能器的前盖板设计成声子晶体结构,通过有限元仿真,分别研究了在一定频率范围内散射体圆心距和散射体半径,对材料的带隙总宽度以及换能器的共振/反共振频率和有效机电耦合系数的影响。结果:带隙总宽度随散射体圆心距增大而减小,随散射体半径增大而增大;换能器的共振/反共振频率随着散射体圆心距的增大呈现先减后增的趋势;换能器的反共振频率随散射体半径的增大呈减小趋势,共振频率随之呈增大趋势;有效机电耦合系数随散射体圆心距增大而增大,随散射体半径增大而减小。结论:换能器的前盖板采用声子晶体结构可以实现调控换能器的部分关键性能参数,研究结果对改善传统的夹心式压电换能器的振动性能具有一定的理论指导意义。
Aims:Based on the band gap theory of phononic crystals,the front cover plate of the transducer was optimized to encure the transducer had good longitudinal vibration performance.Methods:The front cover of the traditional sandwich piezoelectric transducer was designed into a phononic crystal structure.The effects of the center-to-center distance of the scatterer and the radius of the scatterer on the total width of the band gap of the material,the resonant/anti-resonance frequency of the transducer and the effective electromechanical coupling coefficient in a certain frequency range were studied by the finite element method.Results:The total width of the band gap decreased as the center-to-center distance of the scatterer increased.It increased as the radius of the scatterer increased.The resonance/anti-resonance frequency of the transducer showed a trend of first decreasing and then increasing with the increase of the center-to-center distance of the scatterer.The anti-resonance frequency of the transducer decreased with the increase of the radius of the scatterer;and the resonance frequency increased with the radius of the scatterer.The effective electromechanical coupling coefficient of the transducer increased with the increase of the center-to-center distance of the scatterer and decreased with the increase of the radius of the scatterer.Conclusions:The front cover of the transducer adopts a phononic crystal structure,which can control some key performance parameters of the transducer.The vibration performance of the device has certain theoretical guiding significance.
作者
马铭欣
许龙
MA Mingxin;XU Long(College of Sciences,China Jiliang University,Hangzhou 310018,China)
出处
《中国计量大学学报》
2022年第3期360-365,共6页
Journal of China University of Metrology
基金
国家自然科学基金项目(No.12074354)。
关键词
声子晶体
夹心式压电换能器
phononic crystal
sandwich piezoelectric transducer
