Modeling and design of structured noise control materials for modern lightweight structures

提出的研究计划旨在通过建模，原型制作和测试，开发，量化和优化附加在现代轻量化结构上的结构噪声控制材料（也称为声学元材料：AMM）的声学性能。目标AMM结合了所用结构的自然特性（例如刚度、背腔）、主体材料（例如开孔泡沫的被动吸收）以及合适位置的形状和/或谐振内含物，以确保在整个可听频率范围内，特别是在低频范围内获得最大的结构、振动和声学性能。这代表了当前隔声的主要挑战，因为在这个频率范围内，传统的处理方法实际上是低效的。使用最先进的数值和实验工具，方法包括(i)开发，实施和验证在各种激励下具有嵌入式或附加AMM的现代轻型结构的计算效率的全频谱振动声学模型；调查和发展各种药品管理概念；具体来说，研究宿主材料（多孔弹性泡沫、聚合物、蜂窝），其中包含合理放置和结构的内含物（亥姆霍兹谐振器、膜、形状空隙等），目标是在低频下具有更高的吸收和/或隔离性能；（iii）研究实现所提出设计（3D打印、热成型）的方法和材料，并在此基础上制造小规模原型，以阐明主要物理现象，验证所开发建模工具的预测，并量化所开发原型的可变性和鲁棒性；利用具有代表性的工业结构和标准化振动声学测试，评估表现最好的概念的技术就绪程度。这项研究的成果是基础知识（精细化的分析和数值模型，阐明所使用的物理和指导设计）和技术（表征和设计工具，功能齐全的高TRL原型）。这些发展是通用的，适用于交通、航空航天和建筑部门的噪音和振动控制问题。此外，一些高素质的人才将通过这个项目得到培训；他们将能够支持这些行业和加拿大的研究机构。

The proposed research program is aimed at developing, quantifying and optimizing, through modeling, prototyping and testing, the acoustic performance of structured noise control materials (also known as Acoustic Meta-Materials : AMM) attached to modern lightweight structures. The targeted AMM combines the natural properties of the used structure (e.g. stiffness, backing cavity), host material (e.g. passive absorption of open cell foams) with shaped and/or resonant inclusions suitably located to ensure maximum structural, vibration and acoustic performance over the entire audible frequency range and at low frequency in particular. This represents the major and current challenge in sound insulation since in this frequency range conventional treatments are practically inefficient. Using state of the art numerical and experimental tools, the methodology includes (i) developing, implementing and validating computationally efficient full frequency spectrum vibro-acoustics models for modern lightweight structures with embedded or attached AMM under various excitations; (ii) Investigating and developing various AMM concepts; specifically, study host materials (porous elastic foams, polymers, Honeycombs.) with judiciously placed and structured inclusions (Helmholtz resonators, membranes, shaped voids, .) that target higher absorption and/or isolation performance at low frequencies; (iii) investigating methods and materials to realize the proposed design (3D printing, thermoforming) and on this basis fabricate small-scale prototypes to elucidate the main physical phenomena, verify the prediction of the developed modeling tools and quantify the variability and robustness of the developed prototypes; (iv) assess the technological readiness level of the best performing concepts using representative industrial structures and standardized vibro-acoustics tests. The outcome of this research is both fundamental knowledge (refined analytical and numerical models elucidating the used physics and guiding the design) and technology (characterization and design tools, fully functional high TRL prototypes). These developments are generic and applicable to noise and vibration control problems in the transport, aerospace and construction sectors. Moreover, several highly qualified people will be trained through this program; they will be able to support these industries and Canadian research institutions.