Frequency Range Selection for Impedance-Based Structural Health Monitoring
Frequency Range Selection for Impedance-Based Structural Health Monitoring
复制标题
基于阻抗的结构健康监测的频率范围选择
DOI：
10.1115/1.2775506
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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：
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作者：
D. Peairs;P. Tarazaga;D. Inman
基于阻抗的结构健康监测利用压电换能器对结构进行高频局部激励。用同一换能器测量结构的响应。这种反应的变化表明有损伤。在过去，基于阻抗的结构健康监测的频率范围选择是通过试错法完成的，或者是由熟悉该方法的工程师在分析后选择的。这项研究的目的是确定，在未来的应用中，是否有可能根据传感器特性自动选择首选频率范围，甚至可能在安装系统之前。此外，本文还论证了一种确定监测最佳频率范围的方法。该研究通过损伤度量对测量变化进行分析，并将分析结果与测量特征联系起来。具体来说，利用离群值检测概念对传感器在不同频率范围内的损伤检测能力进行了统计评估。将未损坏测量值的变化与不同程度损坏时测量值的变化量进行比较。将不同尺寸的固体压电陶瓷换能器和超细纤维复合压电器件分别粘结在铝和纤维增强复合材料结构上进行了测试。结果表明，决定最佳监测频率范围的不是传感器本身，而是结构特性。最佳监控频率范围。
Impedance-based structural health monitoring uses collocated piezoelectric transducers to locally excite a structure at high frequencies. The response of the structure is measured by the same transducer. Changes in this response indicate damage. Frequency range selection for monitoring with impedance-based structural health monitoring has, in the past, been done by trial and error methods or has been selected after analysis by engineers familiar with the method. This study aims to determine if, in future applications, it is possible to automatically select preferred frequency ranges based on sensor characteristics, perhaps even before installing the system. In addition, the paper demonstrates a method for determining preferable frequency ranges for monitoring. The study examines the analysis of the measurement change through a damage metric and relates the results of the analysis to characteristics of the measurement. Specifically, outlier detection concepts were used to statistically evaluate the damage detection ability of the transducers at various frequency ranges. The variation in undamaged measurements is compared to the amount of change in the measurement upon various levels of damage. Testing was performed with both solid piezoceramic transducers and macrofiber composite piezoelectric devices of different sizes bonded to aluminum and fiber reinforced composite structures. The results indicate that characteristics of the structure, not the sensor alone, determine the optimal monitarine frequency ranges. the optimal monitoring frequency ranges.