ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Flight test measurement for structural load of rotor blade based on fiber Bragg grating
Received date: 2025-02-10
Revised date: 2025-02-20
Accepted date: 2025-03-14
Online published: 2025-03-28
Supported by
National Key Laboratory Foundation of Helicopter Aeromechanics(61422202104)
Fiber Bragg Grating (FBG) sensors are used to characterize the structural loads of rotor blades. An FBG sensing network and its airborne measurement system are designed for in-flight measurement of rotor blade structural loads. In flight testing, a single-load calibration method based on the differential algorithm of FBG response information was employed to obtain the load model coefficient matrix, and a method for determining the actual installation angle of the blade section is proposed. Data analysis shows that the load model error meets the engineering requirement of less than 5% for in-flight measurement. Comparison of FBG sensing results with strain gauge measurements demonstrates the feasibility of FBG-based synchronous dynamic in-flight measurement of rotor blade structural loads, accumulating experience for helicopter strength flight tests based on FBG sensing technology.
Key words: helicopter; rotor; blade; structural loads; fiber Bragg grating; flight test
Weizhen CHENG , Zefeng WANG , Lisong GENG , Jiahong ZHENG , Shuaike JIAO , Kang LI . Flight test measurement for structural load of rotor blade based on fiber Bragg grating[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(24) : 231863 -231863 . DOI: 10.7527/S1000-6893.2025.31863
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