摘要
集成金属3D打印技术、光纤金属化与激光焊接制备–封装工艺,设计了一款低刚度、大量程的高温大应变光纤传感器,以解决航空发动机涡轮叶片热力参量难监测的问题。所设计的传感器采用光纤光栅(FBG)波长–光强混合解调方式,实现对温度与应变的精准测量。通过对带有凹槽的“8”型弹簧衬底进行理论建模、有限元仿真与结构优化,将传感器对待测结构的反作用力降低至167 N/ε。试验表明,该传感器可实现37520με大量程应变测量,在室温~500℃范围内温度线性度达0.9878,同时温度与应变解耦性能良好,最大误差小于8%。这些优异特性证明了所设计的传感器在航空发动机涡轮叶片高温–应变监测方面具有良好的应用前景。
This study integrates metal 3D printing technology,optical fiber metallization,and laser welding preparation–encapsulation processes to design a high-temperature,large-strain optical fiber sensor with low stiffness and a wide measurement range.The aim is to address the challenge of monitoring thermal and mechanical parameters in aeroengine turbine blades.The designed sensor employs a hybrid demodulation method based on fiber Bragg grating(FBG)wavelength and light intensity,enabling precise measurement of temperature and strain.Through theoretical modeling,finite element simulation,and structural optimization of a grooved“8”-shaped spring substrate,the sensor’s reaction force on the measured structure is reduced to 167 N/ε.Experimental results demonstrate that the sensor can achieve a large-range strain measurement of 37520με,with a temperature linearity of 0.9878 within the range of room temperature to 500℃.Additionally,the sensor exhibits excellent temperature-strain decoupling performance,with a maximum decoupling error of less than 8%.These outstanding characteristics indicate that the designed sensor has promising application prospects for high-temperature strain monitoring in aero-engine turbine blades.
作者
李天梁
温宇航
张奥
王念
LI Tianliang;WEN Yuhang;ZHANG Ao;WANG Nian(Wuhan University of Technology,Wuhan 430070,China)
出处
《航空制造技术》
北大核心
2025年第17期34-41,共8页
Aeronautical Manufacturing Technology
基金
国家自然科学基金(52275541)
湖北省重点研发计划(2024BCB056)。
关键词
涡轮叶片
温度–应变测量
光纤光栅
金属3D打印
波长–光强混合解调
Turbine blades
Temperature-strain measurement
Fiber Bragg grating
Metal 3D printing
Wavelength–intensity mixed demodulation
