Detection of Contact-Type Damages by Utilizing Nonlinear Piezoelectric Impedance Modulation of Self-Excited Structures
Detection of Contact-Type Damages by Utilizing Nonlinear Piezoelectric Impedance Modulation of Self-Excited Structures
复制标题
利用自激结构的非线性压电阻抗调制检测接触型损坏
DOI：
10.1115/dscc2013-4058
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Sone
中科院分区：
文献类型：
--
作者：
A. Masuda;Yuya Ogawa;A. Sone
本文通过引入自激振荡，对基于非线性压电阻抗调制（NPIM）的损伤检测方法进行了改进，这是作者提出的一种损伤敏感、无基线的结构健康监测技术。基于NPIM的损伤检测利用损伤部位接触声非线性引起的结构高频波场调制。在这项研究中，通过正反馈表面键合压电传感器测量的应变信号，然后进行 90 度的相移以及由饱和元件和负线性增益组成的非线性元件，将高频波场感应为结构的自激振荡。感应自激在某些本征模频率下可以具有多个稳定的极限环，并且可以通过向反馈环路输入辅助激励信号来在它们之间进行切换。测量流经压电传感器的电流，以检测其由于接触型损伤的存在而引起的刚度波动所引起的调制。使用具有模拟损伤的样本进行实验，以检验自激电路的性能及其对基于 NPIM 的损伤检测方法的适用性。
This paper presents an improvement of a nonlinear piezoelectric impedance modulation (NPIM)-based damage detection method, a damage-sensitive, baseline-free structural health monitoring technique proposed by the authors, by introducing self-excited oscillation. The NPIM-based damage detection utilizes the modulation of high-frequency wave field of structures caused by the contact acoustic nonlinearity at the damaged part. In this study, the high-frequency wave field is induced as a self-excited oscillation of the structure by positively feed-backing the strain signal measured by a surface-bonded piezoelectric sensor, followed by a phase-shift in 90 degrees and a nonlinear element consisting of a saturation element and a negative linear gain. The induced self-excitation can have multiple stable limit cycles at certain eigenmode frequencies, and one can switch among them by inputting an auxiliary excitation signal into the feedback loop. The current flowing through the piezoelectric sensor is measured to detect its modulation due to the stiffness fluctuation due to the existence of the contact-type damage. Experiments using a specimen with a simulated damage are conducted to examine the performance of the self-excitation circuit and its applicability to the NPIM-based damage detection method.