Acoustic Design Tool for Structural Sandwich Panels

蒙特雷亚尔理工学院声学与振动分析实验室(LAVA)和伯灵顿的加拿大公司Comtek正在结合他们的专业知识，为支线飞机和商务机使用的夹层地板的声音衰减开发新的解决方案。复合地板是由夹在两层具有高抗拉刚度的薄皮之间的轻质芯材制成的。这样的设计使轻质结构具有出色的弯曲性能。然而，这种夹层结构的轻质便于传播引起乘客不适和电子系统故障的声学和机械振动。在这种夹层结构中，可以通过修改结构参数，如厚度、芯层和/或皮肤的密度来实现声音衰减。此外，还需要对声音衰减机制有一个很好的科学理解来关联实验测量。在这个合作项目中，将创建一个分析模型来预测复合材料和夹层板的声学特性。主要目的是研究和了解壁板的物理参数与声传递损失之间的关系。因此，一系列已知可以改善声学性能的参数，如岩心剪切模数和岩心密度，将被用作模型的输入。从以前的Engage项目中收集的实验数据将用于验证该模型。这种结合的方法将为Comtek提供宝贵的设计工具，为航空工业开发具有增强声学性能的定制地板。

The Laboratory for Acoustics and Vibration Analysis (LAVA), at École Polytechnique de Montréal, andComtek, a Canadian company based in Burlington, are combining their expertise to develop new solutions forsound attenuation in sandwich floor panels used in regional and business jets. Composite floor panels are madeof lightweight core sandwiched between two thin skins having high tensile stiffness. Such design leads to lightstructures with exceptional flexural properties. However, the lightness of the panels facilitate the propagationof the acoustic and mechanical vibration causing passenger discomfort, and failure of electronic systems.Sound attenuation in such sandwich structures can be achieved through modification of the constructionparameters such as thickness, density of the core and/or the skin. Moreover a good scientific understanding ofthe sound attenuation mechanism is needed to correlate experimental measurements.In this collaborative project, an analytical model will be created to predict the acoustic properties of compositesandwich panels. The main purpose is to investigate and understand the relationship between the physicalparameters of the panels and the sound transmission loss (STL). Thus, a range of parameters known to improveacoustic properties such as the core shear modulus and the density of the core will be used as inputs to themodel. Experimental data collected from a previous Engage project will be used to validate the model. Such acombined approach will provide Comtek with valuable design tool to develop custom made floor panels withenhanced acoustic properties for the aeronautic industry.