Meta-composites for noise and vibration control

提出的研究计划旨在开发用于声音和振动应用的新型轻质元复合材料声音包。我们感兴趣的具体应用包括带有噪声控制处理的现代轻量化结构。目标元复合材料结合了所用结构的自然特性（刚度，重量轻…）和附加的声音包（例如，开放孔泡沫的被动吸收），以及适当定位和控制的共振和主动内含物，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，该方法包括(i)设计具有增强性能的新吸收材料，使用自适应和被动手段的组合；（ii）结合精细的实验验证，为这些元复合材料开发精细而稳健的分析和计算模型；（三）制造缩小尺寸的原型，并使用行业代表性的实验测试来证明其实际性能；（四）量化已开发原型的可变性和稳健性。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，全功能原型）。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 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.