Digital Wideband Excitation Technique for Impedance-Based Structural Health Monitoring Systems
Digital Wideband Excitation Technique for Impedance-Based Structural Health Monitoring Systems
复制标题
用于基于阻抗的结构健康监测系统的数字宽带激励技术
DOI：
10.1109/iscas.2007.378453
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
D. Inman
中科院分区：
文献类型：
--
作者：
Jina Kim;B. Grisso;D. Ha;D. Inman
随着新型机械结构的日益复杂，以及运行中的老化结构，利用结构健康监测技术进行损伤定位变得越来越重要。结构健康监测系统的永久部署受到传感器技术可用性的限制。先前为结构健康监测的阻抗方法所需的硬件小型化所做的努力导致原型依赖于DAC来为感兴趣的结构提供激励。本文提出了一种利用宽带数字信号的新激励技术，以消除系统中DAC的功耗。通过实验比较了该方法与以往的激励方法的性能。结果表明，在降低功耗的同时，损伤检测性能没有损失。
With ever increasing complexity in new mechanical structures, as well as aging structures in operation, locating damage with structural health monitoring techniques is becoming increasingly important. Permanent deployment of structural health monitoring systems is limited by the availability of sensor technology. Previous efforts to miniaturize the hardware required for the impedance method of structural health monitoring resulted in prototypes reliant on a DAC for providing excitation to the structure of interest. In this paper, a new excitation technique using wideband digital signals is proposed to eliminate the power dissipated by a DAC in the system. An experiment is performed to compare performance of the proposed technique and previous excitation techniques. Results are presented and reveal no loss in damage detection performance while reducing the power dissipation.