Identification of physical parameters influencing the acoustic properties of composite sandwich panels

总部位于安大略省伯灵顿的加拿大公司Comtek Advanced Structures通过 多年的复合材料制造经验.康姆泰克现在正在解决声音衰减的问题 商用、支线和商务机上使用的复合夹层地板。复合地板 通常由夹在两层薄皮之间的轻质核心材料组成。此体系结构可实现 轻质结构具有优异的结构性能；然而，这些面板的轻便使 声波和机械振动的传播，导致乘客不适和电子产品损坏 系统。这种夹层结构中的声音衰减可以通过修改 结构参数，如核心和/或外壳的厚度、密度和机械性能。 然而，为了发展，需要对声音衰减机制有科学的理解。 促进地板设计的工程方法，能够实现目标声学 性能。蒙特利尔理工学院在复合材料方面拥有专业知识，并已开发出 关于复合减振的知识。蒙特利尔理工学院的研究人员将与康代密切合作， 确定影响复合地板中声衰减的物理参数。材料和 将对夹层板的组装进行研究，以评估哪些参数最有影响，例如 减震材料、厚度、密度和硬度的成分，泡沫芯材的使用，以及夹杂 皮肤穿孔或隔膜。基于该项目的结果，康代将继续与 蒙特利尔Polyetchnique将进一步开发优化的面板配置。实验数据收集自 该项目将用于分析验证，吸取的经验教训将指导今后的研究工作。 这种组合方法将为Comtek提供一个有价值的设计工具，可用于开发自定义 制造具有目标声学特性的飞机地板。

Comtek Advanced Structures, a Canadian company based in Burlington, Ontario, has developed through the years an expertise in composite manufacturing. Comtek is now tackling the problem of sound attenuation in composite sandwich floor panels used in commercial, regional, and business aircrafts. Composite floor panels typically comprise a lightweight core material sandwiched between two thin skins. This architecture leads to light weight structures having excellent structural properties; however, the lightness of these panels eases the propagation of acoustic and mechanical vibration, causing passenger discomfort and damage of electronic system. Sound attenuation in such sandwich structures can be improved through modification of the construction parameters such as thickness, density, and mechanical properties of the core and/or skin. However, sound scientific understanding of the sound attenuation mechanisms is needed in order to develop engineering methods that would facilitate floor panel designs capable of achieving targeted acoustic performance. Polytechnique Montreal has an expertise in composite materials and has developed great knowledge in composite damping. Researchers at Polytechnique Montreal will work closely with Comtek to identify the physical parameters affecting the sound attenuation in composite floor panels. Materials and assembly of the sandwich panels will be studied to assess which parameters are most influential, such as damping material, thickness, density and stiffness of the constituents, the use of foam core, and the inclusion of perforated skins or septums. Based on the results of this project, Comtek will continue its collaboration with Polyetchnique Montreal to further develop an optimized panel configuration. Experimental data collected from this project will be used for analytical validation, and the lessons learned will guide future research efforts. Such a combined approach will provide Comtek with a valuable design tool that can be used to develop custom made aircraft floor panels having targeted acoustic properties.