Tuned lamb wave excitation and detection with piezoelectric wafer active sensors for structural health monitoring
Tuned lamb wave excitation and detection with piezoelectric wafer active sensors for structural health monitoring
复制标题
DOI：
10.1177/1045389x05050106
复制
发表时间：
2005-04-01
影响因子：
2.7
通讯作者：
Giurgiutiu, V
中科院分区：
文献类型：
--
作者：
Giurgiutiu, V
研究了埋入式压电晶片主动传感器（PWAS）激发和探测调谐兰姆波用于结构健康监测的能力。首先，对兰姆波理论进行了简要的回顾。其次，PWAS的工作原理和他们的结构耦合通过一个薄的粘合剂层进行了分析。然后，一个模型的兰姆波调谐机制与PWAS换能器描述。该模型采用空间域傅里叶变换。在波数空间中进行分析。逆傅立叶变换用于返回到物理空间。用留数定理计算积分。得到了界面剪应力分布的一般表达式的一般解。一般的解决方案是减少到一个封闭形式的表达的情况下，理想的结合，其中承认一个封闭形式的界面剪切应力的傅立叶变换。结果表明，应变波响应的变化像sin γ α，而位移响应的变化像sinc γ α。当PWAS长度等于特定兰姆波模式的半波长时，实现最大耦合。由于兰姆波模式的波长随频率而变化，因此可以实现在某些频率处的某些模式的调谐。调谐曲线的推导和验证实验结果。一个特定的S-0模式的“甜蜜点”被发现在300 kHz的7毫米PWAS连接到一个1.6分钟的铝板。通过脉冲回波技术，利用相控阵原理和调谐SO模式兰姆波的裂纹检测被证明是一种有效的结构健康监测方法。
The capability of embedded piezoelectric wafer active sensors (PWAS) to excite and detect tuned Lamb waves for structural health monitoring is explored. First, a brief review of Lamb waves theory is presented. Second, the PWAS operating principles and their structural coupling through a thin adhesive layer are analyzed. Then, a model of the Lamb waves tuning mechanism with PWAS transducers is described. The model uses the space domain Fourier transform. The analysis is performed in the wavenumber space. The inverse Fourier transform is used to return into the physical space. The integrals are evaluated with the residues theorem. A general solution is obtained for a generic expression of the interface shear stress distribution. The general solution is reduced to a closed-form expression for the case of ideal bonding which admits a closed-form Fourier transform of the interfacial shear stress. It is shown that the strain wave response varies like sin gamma alpha, whereas the displacement response varies like sinc gamma alpha. Maximum coupling is achieved when the PWAS length equals the half wavelength of a particular Lamb wave mode. Since Lamb wave modes wavelengths vary with frequency, the tuning of certain modes at certain frequencies can thus be achieved. Tuning curves are derived and verified against experimental results. A particular S-0 mode 'sweet spot' is found at 300 kHz for a 7-mm PWAS attached to a 1.6-min aluminum plate. Crack detection via the pulse echo technique using the phased array principle and tuned So mode Lamb waves is demonstrated as an effective structural health monitoring method.