An integrated health monitoring technique using structural impedance sensors
An integrated health monitoring technique using structural impedance sensors
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DOI：
10.1106/qxmv-r3gc-vxxg-w3aq
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发表时间：
2000-06-01
影响因子：
2.7
通讯作者：
Inman, DJ
中科院分区：
文献类型：
--
作者：
Park, G;Cudney, HH;Inman, DJ
本文提出了一种综合的方法来检测和定位结构损伤。该方法结合了两种不同的损伤检测方案，分别利用压电材料的机电耦合特性和跟踪频响函数数据的变化。结构中的物理变化引起机械阻抗的变化。由于压电材料中的机电耦合，结构机械阻抗的这种变化引起压电传感器的电阻抗的变化。因此，通过监测电阻抗，可以定性地确定结构损坏何时发生或即将发生。基于损伤产生局部动态变化的事实，该技术通过表面结合的压电传感器/致动器利用高频结构激励（通常大于30 kHz）。作为第二步，一个新开发的基于模型的技术，使用波传播的方法，已被用来定量评估结构的状态。直接频率响应函数数据，而不是模态数据，被用来表征结构中的损伤。一个数值例子和一维结构的实验研究来说明这种技术的性能。
This paper presents an integrated methodology to detect and locate structural damage. Two different damage detection schemes are combined in this methodology, which involves utilizing the electromechanical coupling property of piezoelectric materials and tracking the changes in the frequency response function data, respectively. Physical changes in the structure cause changes in mechanical impedance. Due to the electromechanical coupling in piezoelectric materials, this change in structural mechanical impedance causes a change in the electrical impedance of the piezoelectric sensor. Hence, by monitoring the electrical impedance one can qualitatively determine when structural damage has occurred or is imminent. Based on the fact that damage produces local dynamic changes, this technique utilizes a high frequency structural excitation (typically greater than 30 kHz) through the surface-bonded piezoelectric sensor/actuators. As a second step, a newly developed model-based technique, using a wave propagation approach, has been used to quantitatively assess the state of structures. Direct frequency response function data, as opposed to modal data, are utilized to characterize the damage in the structures. A numerical example and an experimental investigation of one-dimensional structures are presented to illustrate the performance of this technique.