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飞机发动机规格的新材料带来了前所未有的机会。这项为期五年的重大合作项目为创造新型多功能声学材料提供了技术解决方案，以取代传统的发动机衬垫。这项研究的动机是国际监管委员会对飞机噪音、二氧化碳和氮氧化物排放的要求越来越严格。在广泛的频率范围内寻求吸声，以充分响应新的，高效率的发动机配置。该项目由ÉcolePolytechnique de montr<s:1>和赛峰集团（一家国际高科技集团和领先的设备制造商）共同实施。研究了三种新的颠覆性技术，以生产高机械性能飞行认证树脂的功能化轻结构。(1)微网材料是利用最先进的聚合物复合材料增材制造技术生产的。(2)使用一种巧妙的铸造方法，用高性能聚合物复制具有优异声学性能的低机械性能泡沫。(3)采用增材制造技术制备了具有扭曲腔的奇异谐振腔材料。将探索面板纹理和原始穿孔。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。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。最终的结果是一个全尺寸的技术演示，其中新型声学衬垫将集成到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，可以培养36名针对多学科行业问题的高素质人才。他们将致力于开发对加拿大工业有用的先进技术和科学知识和国际软技能。预计下一代超高涵道比发动机将采用创新声学材料。预计将通过赛峰短舱和赛峰通风系统以及最终的赛峰着陆系统应用于加拿大制造的飞机。

Innovative manufacturing technologies bring unprecedented opportunities for creating new materials that meetcomplex and restrictive aircraft engines specifications. This major five-year collaborative project bringstechnological solutions for creating novel, multifunction acoustic materials to replace traditional engine liners.The research is motivated by increasingly stringent requirements from international regulatory boards onaircraft noise, CO2 and NOx emissions. Sound absorption over a broad frequency range is sought in order torespond adequately to new, high-efficiency engine configurations. The project is carried out by ÉcolePolytechnique 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 highmechanical performance flight-certified resins. (1) Micro-meshed materials are produced using state-of-the-artadditive manufacturing of polymeric composites. (2) Low mechanical performance foams that are recognizedfor having excellent acoustic properties are replicated with high-performance polymers using an ingeniouscasting 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 acousticmaterials in engine components will be tested for airworthiness. Representative-size cylindrical prototypes willbe tested with internal flow on a special engine test platform. The final outcome is a full scale technologicaldemonstrator, 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 multidisciplinaryindustry problems. They will engage in developing advanced technical and scientific know-how andinternational soft skills useful to the Canadian industry. Implementation of the innovative acoustic materials isforeseen on next generation ultra-high bypass ratio engines. Devired applications to Canadian-made aircraftsare expected through Safran Nacelles and Safran Ventilation Systems, and eventually Safran Landing Systems.