压电纤维布置结构对Lamb波方向识别的影响研究*
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中图分类号: TH878文献标识码: A国家标准学科分类代码: 4604020

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*基金项目:国家自然科学基金(51805161)、湖南省重点研发计划(2018GK2044)、湖南省教育厅科学研究项目优秀青年项目(18B567)资助


Study on the influence of piezoelectric fiber configurations on Lamb wave direction identification
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    摘要:

    摘要:由于压电纤维对Lamb波具有良好的方向传感特性,采用类似“应变花”的压电纤维传感器能够实现Lamb波方向检测。针对常见的45°直角形、135°直角形、60°三角形和120°三角形等4种结构形式,开展理论、仿真和实验研究不同压电纤维传感器布置结构对Lamb波方向识别精度的影响。根据压电方程和Lamb波传播衰减特性,理论推导了窄带激励下压电纤维对A0模式Lamb波的传感响应方程,定义基于3根压电纤维响应幅值的误差函数来估计Lamb波方向;利用ANSYS软件开展压电耦合仿真分析获得不同压电纤维传感器的响应信号,并开展了相应的实验测试,采用匹配追踪算法进行信号分解并提取其响应幅值;根据误差函数和响应信号对Lamb波方向进行识别,对比并讨论了仿真和实验误差产生的原因。分析结果表明:4种压电纤维布置结构的识别误差取决于压电纤维长度与布置角度、激励频率、实验压电纤维的粘接等情况;从总体误差大小来看,135°直角形结构方案最优,误差小于4%;60°三角形略优于45°直角形结构,误差小于8%;由于120°三角形结构整体尺寸较大,其识别误差最大,这将为压电纤维传感器结构设计提供了一定的理论依据。

    Abstract:

    Abstract:Due to the good direction sensing characteristic of piezoelectric fiber to Lamb wave, the piezoelectric fiber sensor, which is similar to the strain rosette, is adopted to achieve the detection of the Lamb wave propagation direction. Aiming at commonly used 4 structure configurations of 45°rectangular, 135°rectangular, 60°delta and 120°delta, the theoretical, simulation and experiment studies are conducted to find out the influences of various piezoelectric fiber sensor configurations on the identification accuracy of Lamb wave propagation direction in this paper. According to the piezoelectric equation and attenuation characteristic of Lamb wave propagation, the sensing response equation of piezoelectric fiber to A0 mode Lamb wave under narrowband excitation is theoretically derived. The error function of the response amplitudes of three piezoelectric fibers is defined and used to estimate the Lamb wave propagation direction. The ANSYS software was adopted to conduct the piezoelectric coupling simulation analysis and obtain the response signals of different piezoelectric fiber sensors, and corresponding experiment tests were carried out. The matching pursuit algorithm was applied to perform the signal decomposition and extract the response amplitudes. The Lamb wave propagation directions were identified according to the error function and the response signals. The simulation and experiment results are compared, the causes of simulation and experiment errors are discussed. The analysis results show that the identification errors of the Lamb wave direction detection for four different configurations of the piezoelectric fiber depend on the length of the piezoelectric fiber, configuration angle, excitation frequency, the adhesion condition of the piezoelectric fiber, and etc. In terms of overall error, the 135°rectangular configuration is the best, the error is less than 4%; the 60°delta configuration is slightly better than the 45°rectangular configuration, its error is less than 8%; due to the large size, the 120°delta configuration presents the largest error. This study could provide a theoretical basis for piezoelectric fiber sensor structure design.

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沈意平,唐斌龙,王送来,阳雪兵,吴万荣.压电纤维布置结构对Lamb波方向识别的影响研究*[J].仪器仪表学报,2020,41(1):154-161

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  • 在线发布日期: 2022-01-11
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