Sound insulation with tailored properties: a multiphysics simulation approach for acoustic metamaterials

语音或音乐形式的声音为人类互动铺平了道路。然而，噪音会导致严重的健康问题，并对我们的健康和环境产生重大的负面影响。不断增长的城市化和交通负荷使得实现当前的噪声保护目标更具挑战性，需要创新和有效的隔音技术，如声学超材料。这些包括局部共振微结构的阵列，这些微结构被调谐以消除不期望的振动声学模式，例如发动机噪声。然而，目前的设计方法要么是计算昂贵的或不合理地假设完美的周期性和缺乏边界层效应。这些假设往往会导致不正确的或次优的设计，其功能和制造工艺。本研究项目的目标是发展一种新的数值方法的研究和设计的声学超材料。我们的假设是，它是可以构思和验证的多物理仿真模型，准确地考虑流体-结构相互作用和边界层效应，例如粘热损失，同时足够有效地处理大型非周期models.We追求一种新的方法的基础上的边界元法（BEM）的无流声学。粘热间断配置边界元法考虑了边界层效应及其吸收势。该方法进一步扩展了双向耦合条件的流固耦合。最后，快速多极子方法有效地解决了现代异构硬件架构上的方程组。这三种方法的结合将使具有定制隔音性能的声学超材料的鲁棒性和准确性建模成为可能。

Sound in form of speech or music paves the way for human interaction. Noise, however, can cause severe health issues and has a significant negative impact on our well-being and our environment. Increasing urbanisation and traffic loads make reaching current noise protection goals even more challenging and require innovative and effective noise insulation technologies like acoustic metamaterials. These comprise arrays of locally resonant microstructures tuned to cancel undesired vibro-acoustic patterns such as engine noise. However, current design methods are either computationally expensive or unwarrantedly assume perfect periodicity and a lack of boundary-layer effects. These assumptions often result in incorrect or sub-optimal designs regarding their functionality and manufacturing process.This research project targets the development of a novel numerical method for the investigation and design of acoustic metamaterials. The hypothesis is that it is possible to conceive and validate a multi-physics simulation model that accurately accounts for fluid-structure interaction and boundary-layer effects, e.g. viscothermal losses, while being efficient enough to handle large aperiodic models.We pursue a novel approach based on the boundary element method (BEM) for flow-free acoustics. The viscothermal discontinuous collocation BEM accounts for the boundary-layer effects and their absorption potential. The method is further extended by bi-directional coupling conditions for fluid-structure interaction. Finally, the Fast Multipole Method efficiently solves the system of equations on modern heterogeneous hardware architectures. The combination of these three methods will enable the robust and accurate modelling of acoustic metamaterials with tailored sound insulation properties.