Directional GUW emission and sensing systems in fibre metal laminates

在研究单元FOR3022中，子项目2关注的是引导超声波（GUW）的可观测性和激励及其与纤维金属层压板（FML）内部损伤的相互作用，用于损伤检测和分类。总体目标是提高FML无线结构健康监测系统的信息密度和能量效率。研究方法是结合三个研究领域的潜力。首先，WG Dietzel将开发具有多轴灵敏度的新型无线操作和评估MEMS传感器，以独立观察单个传感器中发生的GUW的平面内和平面外分量。基于玻璃硅的MEMS传感器非常适合低干扰集成，因为它们具有适应性的声学特性，非常小的尺寸和灵活的可选择几何形状。MEMS传感器具有高灵敏度，适用于多维加速度场。其次，WG Sinapius将扩展可嵌入相控阵换能器的技术，用于各向异性和非均匀材料，如FML，以实现定向GUW激发和传感，从而分别提高能量效率和信息密度。WG Sinapius的研究对象是用于FML中声学损伤检测的传感器节点的结构顺应性层间嵌入。第三，WG Lüssem将采用关于谐振电路的无线电力传输的新方法进行能量和信号传输，以无线方式在FML中发射GUW。结合起来，这些组件是激发和观察纤维金属层压板内的波传播的关键，作为结构损伤自动识别和分类的基础。

Within the Research Unit FOR3022, subproject 2 is concerned with the observability and excitation of guided ultrasonic waves (GUW) and their interaction with internal damage inside fibre metal laminates (FML) for damage detection and classification. The general aim is to increase the information density and energy efficiency in wireless structural health monitoring systems for FML. The research approach is the combination of the potentials of three research fields. First, novel wirelessly operated and evaluated MEMS sensors with multi-axis sensitivity will be developed by WG Dietzel to independently observe in-plane and out-of-plane components of the occurring GUW in a single sensor. Glass-silicon based MEMS sensors are ideally suited for low-interference integration due to their adapted acoustic properties, their very small dimensions and their flexibly selectable geometry. MEMS sensors have a high sensitivity and are suitable for multidimensional acceleration fields. Second, the technique of embeddable phased array transducers will be extended by WG Sinapius for anisotropic and inhomogeneous materials such as FML to enable directional GUW excitation and sensing and thus increase the energy efficiency and information density, respectively. The structure-compliant interlaminar embedding of the sensor nodes for acoustic damage detection in FML is the object of research by WG Sinapius. Third, novel approaches in wireless power transfer concerning resonant circuits will be adapted by WG Lüssem for energy and signal transmission to emit GUW in FML wirelessly. In combination, these components are the key to exciting and observing wave propagation inside fibre metal laminates as a basis for automatic identification and classification of structural damage.