摘要
为检测厚板和厚壁管道表面缺陷。采用1-3型压电复合材料结合有限元方法设计了一种柔性非等间距梳状宽带表面波传感器。首先优化了复合材料参数。当复合材料宽高比小于0.6,压电相体积百分比为70%时为最佳参数。然后采用优化得到的压电复合材料,设计了宽度渐变和厚度渐变的传感器,并进行了频率响应,指向性和缺陷检测模拟。结果表明,设计的传感器-3 dB带宽达到420kHz,指向性良好,并且能够在不同频率实现缺陷检测。为传感器实物制作提供了理论基础。
In order to detect surface defects in thick and thick walled pipes,a flexible non equally spaced comb broadband surface wave transducer was designed using 1-3 piezoelectric composites combined with finite element method.Firstly,the com posite parameters were optimized.When the aspect ratio of the composite is less than 0.6,the volume percentage of the piezoelec tric phase is 70%,which is the best parameter.Then using the optimized piezoelectric composites,a transducer with width gradient and thickness gradient was designed,and frequency response,directivity and defect detection simulation were performed.The re sults show that the designed transducer -3 dB bandwidth reaches 420 kHz,has good directivity,and can detect defects at different frequencies.This article provides a theoretical basis for the transducer production.
作者
赵华民
何存富
吕炎
ZHAO Hua-min;HE Cun-fu;LYU Yan(College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,Beijing 100124,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2019年第6期5-10,28,共7页
Instrument Technique and Sensor
基金
国家自然科学基金项目(51235001)
关键词
梳状传感器
表面波
有限元方法
压电复合材料
厚壁管道
comb transducer
surface wave
finite element method
piezoelectric composites
thick walled pipe
