Engineering metastructures for the full control of flexural waves

Abstract

Thin plate structures are widely used in dynamic platforms. The artificial modulation of elastic waves in thin plates has always been one of the most important factors affecting the dynamic performance of devices. Dynamic platforms require vibration modulation of flexural waves to ensure the stability of the overall structural vibration characteristics, while also ensuring the comfort of the internal working environment. However, in the current research on flexural wave modulation, there are still some urgently problems that need to be investigated of the wave modulation in robustness, predictability, compactness and tunability. This thesis focused on the full control of elastic waves in frequency and time domains, achieved the robustness waveguides, robust and predictable cavity mode, compact bound state in the continuum with high-quality factor, and the complex effective elastic constant by time-modulated scatterer.