我国的船用螺旋桨长期因金属材料所引起的噪声、腐蚀和疲劳寿命等问题而备受困扰，与金属桨相比，复合材料螺旋桨具有轻质高效、低振动、低噪音、耐海水腐蚀、抗疲劳等优势。复合材料螺旋桨的关键问题是如何在材料和结构可设计性的基础上充分利用流固耦合机理实现其优异的水动力性能和声隐身能力，其中，对复合材料螺旋桨的水弹性行为描述及变形预测至关重要，目前尚缺乏成熟完善的理论，更缺乏有效的实验手段对现有理论进行验证和修正。本项目提出将光纤光栅(FBG)传感技术用于碳纤维复合材料（CFRP）螺旋桨的变形监测，建立CFRP螺旋桨的结构力学模型，预测流场载荷下CFRP螺旋桨的应变和变形，提出基于应变信息的CFRP螺旋桨的变形重构方法，提出FBG应变传感网络优化布局，构建FBG分布式应变传感网络，集成FBG应变传感网络和变形重构方法，实现CFRP桨叶在水下环境的变形在线监测，为CFRP螺旋桨的设计理论奠定实证基础。

Our country's marine propeller has struggled with noise, corrosion and fatigue life caused by metal material for a long time. Compared with a metal propeller, composite propeller has the advantages of light-weight, high efficiency, low vibration, low noise, corrosion resistance, fatigue resistance. The key problem of composite propeller research is how to fully use the fluid-structure coupling mechanism based on material and structure designability to achieve its excellent hydrodynamic performance and acoustic stealth capability. The hydroelastic behavior description of composite propeller and deformation prediction is essential, however, it is lack of mature and perfect theory, more a lack of effective means of experimental verification and correction of the existing theory. This project proposed to apply Fiber Bragg Grating(FBG) sensing technology in the deformation monitoring of Carbon Fiber Reinforced Plastic (CFRP) marine propeller, to establish the mechanical model of CFRP propeller, predict the strain and deformation of CFRP propeller under fluid load; propose the deformation reconstruction method based on strain information, develop the optimized FBG sensor network layout according to the deformation reconstruction, construct the distributed FBG strain sensor network, integrate the FBG strain monitoring- deformation reconstruction system, realize the deformation online monitoring; and to provide solid foundation for CFRP propeller design theory.