Phononic structures for ultra-precision sensing
Sabiju Valiya Valappil (PhD candidate), Alejandro M. Aragón (supervisor), and Fred van Keulen (supervisor)
Phononic crystals (PnCs) and acoustic metamaterials (AMMs) are architectured structures that show unusual dynamic characteristics due to the presence of band gaps (BGs), which prevent the propagation of mechanical waves in their corresponding frequency range. The two mechanisms of BG formation are Bragg scattering (due to destructive interference at material interfaces) and Mie scattering (resonance frequency of resonators). PnCs and AMMs are used in various applications such as vibration isolation, energy harvesting, acoustic cloaking, and frequency steering among others. In this project, we focus on the wave rejection/steering aspect of PnCs and AMMs.
To use PnCs and AMMs for removing/redirecting unwanted waves to improve the accuracy of flow measuring systems.
Analytical and numerical methods (e.g, spectral element method, finite element method, etc.,) to analyze and design periodic unit cells (PUCs) and finite waveguides of PnCs and AMMs. Realize these designs by using additive manufacturing and perform high-precision experiments for verification.