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

创新的制造技术为创造满足以下要求的新材料带来了前所未有的机遇： 复杂和限制性的飞机发动机规格。这一为期五年的重大合作项目带来了 技术解决方案，创造新型多功能声学材料，以取代传统的发动机衬套。 这项研究的动机是越来越严格的要求，从国际监管委员会， 飞机噪音、二氧化碳和氮氧化物排放。寻求在宽频率范围上的吸声，以便 充分响应新型高效发动机配置。该项目由École执行。 蒙特利尔理工学院和赛峰集团，一家国际高科技集团和领先的设备制造商。 研究了三种新的破坏性技术，以产生由高分子材料制成的功能化光结构。 机械性能飞行认证的树脂。(1)微孔材料是使用最先进的 聚合物复合材料的增材制造。(2)公认的低机械性能泡沫 具有出色的声学性能，采用巧妙的 铸造法(3)具有扭曲腔的异国情调的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。用于集成声学的各种设计 发动机部件的材料将进行适航性测试。代表性尺寸的圆柱形原型将 在专用发动机试验台上进行内流试验。最终的结果是一个全面的技术 在LEAP发动机复合材料风扇箱上集成了新型声学衬里。 这个雄心勃勃的项目是一个独特的机会，培养36名高素质的多学科人才， 产业问题。他们将致力于开发先进的技术和科学知识， 对加拿大工业有用的国际软技能。创新声学材料的实施是 预计将用于下一代超高涵道比发动机。对伊朗制造的飞机的偏离应用 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。

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.