Meta-composites for noise and vibration control

拟议的研究计划旨在开发设计用于声音和振动应用的新颖和轻量级的元复合材料和音响组件。感兴趣的具体应用包括带有噪声控制处理的现代轻质结构。目标元复合材料结合了所用结构的自然属性(刚性、轻质…)以及带有共振和主动夹杂物的附着式音响组件(例如，开孔泡沫的被动吸收)，适当地定位和控制，以确保在整个可听频率范围内，特别是在低频下，具有最大的结构、振动和声学性能。这代表了隔音方面的主要和当前的挑战，因为在这个频率范围内，传统的处理方法实际上效率低下。使用最先进的数值和实验工具，该方法包括：(I)结合自适应和被动手段设计具有增强性能的新型吸波材料；(Ii)为这些元复合材料开发精确和稳健的分析和计算模型，并结合其精细的实验验证；(Iii)制造缩小比例的原型，并使用具有行业代表性的实验测试来证明其实用性能；以及(Iv)量化所开发原型的可变性和稳定性。这项研究的成果既有基础知识(精细的分析和数值模型阐明了所使用的物理并指导设计)，也有技术(表征和设计工具、全功能原型)。这些发展是通用的，适用于运输、航空航天和建筑部门的噪音和振动控制问题。此外，还将通过该计划培训几名高素质的人员；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 novel and lightweight meta-composite  sound packages designed for sound and vibration applications. The specific application of interest consists of modern lightweight constructions with attached noise control treatments. The targeted meta-composites combine the natural properties of the used structures (stiffness, lightweight…) and attached sound packages (e.g. passive absorption of open cell foams) with resonant and active inclusions suitably located and controlled 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) designing new absorptive materials with augmented performances using a combination of adaptive and passive means; (ii) developing refined and robust analytical and computational models for these meta-composites combined with their fine experimental validations; (iii) fabricating reduced scale prototypes and using industry representative experimental tests to prove their practical performance and (iv) quantification of the variability and robustness of the developed prototypes. 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 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.