TY - THES ID - 136842841 TI - Ultra-thin panels with embedded Helmholtz resonators for improved low-frequency sound transmission loss AU - Luykx, Wim AU - Desmet, Wim AU - Deckers, Elke AU - Van Belle, Lucas AU - Zhang, Ze AU - KU Leuven. Faculteit Ingenieurswetenschappen. Opleiding Master in de ingenieurswetenschappen. Werktuigkunde (Leuven) PY - 2020 PB - Leuven KU Leuven. Faculteit Ingenieurswetenschappen DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:136842841 AB - Metamaterials are a hot topic within sound absorption these days, so a lot of research is conducted in this area. Most work is done with resonators at rather high frequencies and is often only verified for a single unit cell, which leaves room for additional research and experiments. The goal of this thesis is to design ultra-thin panels with embedded cylindrical Helmholtz resonators for improved acoustical performance around a targeted low frequency. Therefore, different models have been developed and implemented, for design as well as for validation purposes. Combining these design models with a mathematical optimization approach allowed to explore the design boundaries and constraints and finally led to a mathematical model-based optimizer, that could effectively be used to design panels in both MDF and glass. Validation with numerical models in both COMSOL (infinite panels) and Simcenter (finite panels) show that the proposed designs meet (and even outperform) the desired goals within the targeted frequency range. ER -