用于ZGV Lamb波检测的PVDF梳状换能器及性能研究  

PVDF comb transducers for ZGV Lamb waves detection and its performance study

作　　者：郭帅[1] 尹莘新 邓明晰 Guo Shuai;Yin Shenxin;Deng Mingxi(College of Aerospace Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学航空航天学院,重庆400044

出　　处：《仪器仪表学报》2024年第6期83-90,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(12134002)项目资助。

摘　　要：能够准确激励与响应零群速度(ZGV)Lamb波的换能器是ZGV Lamb波检测应用的重要支撑。现有用于ZGV Lamb波检测的换能器存在信号弱、信噪比低等问题,为此,本文设计了一种柔性好、灵敏度高的聚偏二氟乙烯(PVDF)梳状换能器,并研究了换能器对ZGV Lamb波的激发响应性能。首先,分析了梳状换能器的工作特性,根据薄铝板的ZGV模式设计制作了PVDF梳状换能器;其次,在不同中心频率的脉冲信号下通过PVDF梳状换能器激发ZGV Lamb波,并与PVDF方形电极换能器做了性能对比实验;最后,分析了PVDF梳状换能器电压响应特性与附着层厚度之间的关系。实验结果表明,设计制作的PVDF梳状换能器能够精准的激励与响应ZGV Lamb波,其响应信号的ZGV频域幅值相对大小随着附着层厚度的增加显著减小。The transducer that can accurately excite and respond to zero group velocity(ZGV)Lamb waves is crucial for the application of ZGV Lamb waves detection.The traditional transducers used for ZGV Lamb waves detection suffer from issues such as weak signals and low signal-to-noise ratio.In this paper,a polyvinylidene fluoride(PVDF)comb transducer with good flexibility and high sensitivity is designed,and the excitation response performance of the transducer to ZGV Lamb waves is studied.Firstly,the operating characteristics of the comb transducer are analyzed,and the PVDF comb transducer is designed and manufactured according to the ZGV mode of a thin aluminum plate.Subsequently,the ZGV Lamb waves were excited by the PVDF comb transducer under the pulse signals with different center frequencies,and performance comparison experiments were conducted with PVDF square electrode transducers Finally,the relationship between the voltage response characteristics of the PVDF comb transducer and the thickness of the attachment layer was analyzed.Experimental results demonstrate that the PVDF comb transducer designed and manufactured can accurately excite and respond to the ZGV Lamb waves.Moreover,the relative amplitude of the ZGV frequency domain of the response signals decreases significantly with the increase of the thickness of the attachment layer.

关 键 词：零群速度Lamb波 PVDF 梳状换能器 附着层厚度 

分 类 号：TH89[机械工程—仪器科学与技术] O426.4[机械工程—精密仪器及机械]