Integration of absorbing materials in composite structures for turbofan engine noise reduction

创新的制造技术为创造符合**复杂和限制性飞机发动机规格的新材料带来了前所未有的机会。这个为期五年的重大合作项目带来了**技术解决方案，用于创造新型、多功能的声学材料来取代传统的发动机衬里。**这项研究的动机是国际监管委员会对**飞机噪音、二氧化碳和NOx排放的要求越来越严格。为了**充分响应新的、高效率的发动机配置，需要在宽频率范围内进行吸声。该项目由国际高科技集团和领先的设备制造商赛峰集团进行。**研究了三项新的颠覆性技术，以生产由高**机械性能飞行认证树脂制成的功能化光结构。(1)微网状材料是使用最先进的聚合物复合材料**添加剂制造而成的。(2)被公认为**具有优异声学性能的低机械性能泡沫用高性能聚合物使用巧妙的**铸造方法进行复制。(3)具有扭曲腔的奇异谐振器材料是通过加法制造而成的。**将探索面片织构和原始穿孔。在发动机部件中集成声学材料的各种设计将进行适航性测试。典型尺寸的圆柱形原型将**在一个特殊的发动机测试平台上进行内部流动测试。最终的结果是一个全面的技术**演示，其中新的声学衬垫将集成到Leap发动机复合材料风扇外壳中。**这个雄心勃勃的项目是一个独特的机会，可以培训36名高素质的人员了解多学科**行业问题。他们将致力于开发先进的技术和科学诀窍以及**对加拿大工业有用的国际软技能。这种创新的声学材料有望在下一代超高旁路比发动机上实现。预计将通过赛峰机舱和赛峰通风系统**应用于加拿大制造的飞机，并最终应用于赛峰着陆系统。

Innovative manufacturing technologies bring unprecedented opportunities for creating new materials that meet**complex and restrictive aircraft engines specifications. This major five-year collaborative project brings**technological solutions for creating novel, multifunction acoustic materials to replace traditional engine liners.**The research is motivated by increasingly stringent requirements from international regulatory boards on**aircraft noise, CO2 and NOx emissions. Sound absorption over a broad frequency range is sought in order to**respond adequately to new, high-efficiency engine configurations. The project is carried out by École**Polytechnique de Montréal and Safran, an international high-tech group and leading equipment manufacturer.**Three new disruptive technologies are investigated to produce functionalized light structures made of high**mechanical performance flight-certified resins. (1) Micro-meshed materials are produced using state-of-the-art**additive manufacturing of polymeric composites. (2) Low mechanical performance foams that are recognized**for having excellent acoustic properties are replicated with high-performance polymers using an ingenious**casting method. (3) Exotic resonator materials with twisted cavities are made through additive manufacturing.**Face sheet textures and original perforations will be explored. Various designs for integrating acoustic**materials in engine components will be tested for airworthiness. Representative-size cylindrical prototypes will**be tested with internal flow on a special engine test platform. The final outcome is a full scale technological**demonstrator, where novel acoustic liners will be integrated to a LEAP engine composite fan case.**This ambitious project is a unique opportunity to train 36 highly qualified personnel on multidisciplinary**industry problems. They will engage in developing advanced technical and scientific know-how and**international soft skills useful to the Canadian industry. Implementation of the innovative acoustic materials is**foreseen on next generation ultra-high bypass ratio engines. Devired applications to Canadian-made aircrafts**are expected through Safran Nacelles and Safran Ventilation Systems, and eventually Safran Landing Systems.