Structural-acoustic protection for sandwich-composite fuselage

主要目的是开发用于现代飞机的三明治复合材料机身结构的预测工具和附加声保护。环境限制，包括（质量，尺寸……）飞机的舒适性将不得不考虑。例如，由于夹层板的刚度和核心剪切，这些结构的声透射率很高。这些高水平的辐射，尤其是低频辐射，会损害室内的舒适度。目前的噪声控制方法需要更重、更厚的声学处理和更多的阻尼。因此，需要开发更轻量、更高效的材料。由于结构声问题的耦合特性，需要考虑声通过结构的优化问题。

The main objective is to develop prediction tools and add-on sound acoustic protection of sandwich-composite fuselage constructions used in modern aircrafts. The environmental constraints, including (mass, size...) for aircraft comfort will have to be considered. For instance, because of the stiffness and core shearing in a sandwich-panel, high acoustic transmission is observed for these constructions. These high levels, especially at low frequencies, can be damaging to interior comfort. Current noise control approaches require heavier, thicker acoustic treatments and more damping. Development of more lightweight and efficient materials is thus needed. Due to the coupled nature of the structural-acoustic problem, the optimization of the acoustic transmission through the structure should be considered.