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Integrated impedance and Lamb wave-based structural health monitoring strategy for long-term cycle-loaded composite structure

机译：基于阻抗和兰姆波的综合结构健康监测策略

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摘要

Impedance of a sensor is sensitivity to small structural damage which surrounds the sensor. Lamb wave propagation provides higher damage detection efficiency in the range of large area. Both methods have been widely developed for structural health monitoring. This article presents integrated impedance and Lamb wave-based structural health monitoring strategy for composite pressure vessels. The output of the presented structural health monitoring strategy includes distribution and classification of damage and health condition of sensor network under varying internal pressure loading environments. In the strategy, a novel damage index adjusting method for Lamb wave damage detection is developed based on the signal features of real and imaginary parts of the sensor impedance. First, the potential structural damage is pre-warned by monitoring the impedance variation of the piezoelectric transducer sensor network. Then, the health condition of sensor network under the working condition is assessed by impedance-based self-diagnosis method; subsequently, the Lamb wave damage index is adjusted based on the result of sensor self-diagnosis. Finally, on the basis of sensor self-diagnosis and damage index adjustment result, damage identification and classification are performed. Practical efficacy of the structural health monitoring approach is tested by the damage monitoring experiment on loaded composite structure.
机译：传感器的阻抗是对围绕传感器的小结构损坏的敏感性。在大面积范围内，兰姆波传播提供了更高的损伤检测效率。两种方法已被广泛开发用于结构健康监测。本文提出了基于阻抗和基于兰姆波的集成压力容器的结构健康监测策略。所提出的结构健康监测策略的输出包括在变化的内部压力负载环境下传感器网络的损坏和健康状况的分布和分类。在该策略中，根据传感器阻抗的实部和虚部的信号特征，开发了一种新的兰姆波损伤检测指标。首先，通过监视压电换能器传感器网络的阻抗变化来预警潜在的结构损坏。然后，通过基于阻抗的自诊断方法评估传感器网络在工作状态下的健康状况。随后，根据传感器的自诊断结果调整兰姆波损伤指数。最后，基于传感器的自诊断和损伤指标调整结果，进行损伤识别和分类。通过对载荷复合结构的损伤监测实验，测试了结构健康监测方法的实际效果。

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