Directional GUW emission and sensing systems in fibre metal laminates

在研究单位FOR3022内，分项目2涉及导波(GUW)的可观测性和激发及其与纤维金属层板(FML)内部损伤的相互作用，以进行损伤检测和分类。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。研究方法是将三个研究领域的潜力结合起来。首先，WG Dietzel将开发新型无线操作和评估的多轴灵敏度MEMS传感器，在单个传感器中独立观察发生的GUW的面内和面外分量。玻璃-硅基MEMS传感器因其自适应的声学特性、非常小的尺寸和灵活选择的几何形状而非常适合低干扰集成。MEMS传感器具有很高的灵敏度，适用于多维加速度场。其次，WG Sinapius将嵌入式相控阵换能器技术扩展到各向异性和非均匀材料，如FML，以实现对GUW的定向激励和传感，从而分别提高能量效率和信息密度。声损伤检测传感器节点在FML中的结构兼容层间嵌入是WG Sinapius的研究对象。第三，WG Lüssem将采用与谐振电路有关的无线功率传输的新方法来传输能量和信号，以在FML中无线发射GUW。总而言之，这些组件是激发和观察波在纤维金属层合板中传播的关键，作为自动识别和分类结构损伤的基础。

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.