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

创新的制造技术为创造满足复杂和限制性航空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声学材料，以取代传统的发动机衬套。这项研究的动机是国际监管机构对飞机噪音、二氧化碳和氮氧化物排放的要求越来越严格。为了充分响应新型高效发动机配置，需要在较宽的频率范围内进行吸声。该项目由École**Polytechnique de Montréal和Safran（一家国际高科技集团和领先的设备制造商）共同实施。研究了三种新的突破性技术，以生产由高机械性能飞行认证树脂制成的功能化轻结构。(1)微孔材料是使用最先进的聚合物复合材料的增材制造技术生产的。(2)低机械性能的泡沫被公认为 ** 具有优异的声学性能，使用巧妙的 ** 铸造方法与高性能聚合物复制。(3)具有扭曲腔的异国情调谐振器材料通过增材制造制成。**面板纹理和原始穿孔将被探讨。各种将声学材料集成到发动机部件中的设计将进行适航性试验。代表性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。最后的成果是一个全尺寸的技术 ** 演示器，其中新型声学衬里将集成到LEAP发动机复合材料风扇箱中。**这个雄心勃勃的项目是一个独特的机会，培训36名高素质的人员对多学科 ** 行业问题。他们将致力于发展对加拿大工业有用的先进技术和科学知识以及国际软技能。创新声学材料的应用 ** 预计将在下一代超高涵道比发动机上实现。预计将通过赛峰机舱和赛峰通风系统，并最终通过赛峰着陆系统，将其应用于埃塞俄比亚制造的飞机 **。

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.