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Health Monitoring Of A Thermal Protection System Using Lamb Waves

机译：使用兰姆波的热保护系统的健康监测

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The applicability of guided waves as a structural health monitoring (SHM) tool to predict the point of impact and detect delamination in a thermal protection system (TPS) is studied. A model TPS was designed by bonding ceramic porous tiles to a 2.2 mm thick 2124-T351 aluminum alloy plate. The delamination defect may be caused by the impact phenomenon or due to other reasons such as manufacturing defect, thermal, or mechanical fatigue, etc. Impact phenomenon is simulated by dropping a ping pong ball on the tiled structure. The delamination at the interface between the ceramic tile and the aluminum plate is simulated by removing the adhesive bond at the selected interface regions during the specimen fabrication process. The conventional triangulation technique cannot predict the point of impact in a tiled plate structure because the triangulation technique assumes that the wave speed is independent of the direction of propagation which is not the case for ceramic tile mounted plates. An alternative method based on the optimization scheme was proposed by Kundu et al. [1] to locate the point of impact in plates by analyzing the time of arrival of the ultrasonic signals received by passive sensors attached to the plate. This objective function based method is used to locate the impact point on the tiled plate. Experiments are carried out by dropping a ping pong ball on the tiled structure and recording acoustic signals by passive transducers adhesively bonded to the plate at three different locations. The impact point is predicted and compared with the actual location of impact. Delamination detection studies were conducted in the pitch-catch mode, by changing the angle of strike and the frequency of the transducer excitation to generate the appropriate guided wave mode. The delamination defect could be detected and the impact point could be identified underlining the importance of the use of guided waves as an SHM tool for TPS.
机译：研究了导波作为结构健康监测（SHM）工具来预测冲击点并检测热保护系统（TPS）中分层的适用性。通过将陶瓷多孔砖粘合到2.2毫米厚的2124-T351铝合金板上来设计TPS模型。分层缺陷可能是由冲击现象引起的，也可能是由其他原因引起的，例如制造缺陷，热或机械疲劳等。冲击现象是通过将乒乓球滴在平铺结构上来模拟的。在样品制造过程中，通过去除所选界面区域上的粘合剂，可以模拟瓷砖与铝板之间的界面处的分层。常规的三角测量技术无法预测平铺板结构中的冲击点，因为三角测量技术假定波速与传播方向无关，而瓷砖安装板则不然。 Kundu等人提出了一种基于优化方案的替代方法。 [1]通过分析附着在板上的无源传感器接收到的超声波信号的到达时间来确定板上的碰撞点。这种基于目标函数的方法用于在平铺板上定位冲击点。通过将乒乓球滴在瓷砖结构上并通过在三个不同位置粘合到板上的无源换能器记录声信号来进行实验。预测冲击点并将其与冲击的实际位置进行比较。通过改变触角和换能器激励的频率以产生适当的导波模式，在俯仰捕捉模式下进行分层检测研究。可以检测到分层缺陷，并可以确定冲击点，从而突出了使用导波作为TPS的SHM工具的重要性。

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