旋翼桨叶结构载荷光纤布拉格光栅传感试飞技术

doi:10.7527/S1000-6893.2025.31863

Abstract

Abstract:

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

CLC Number:

V217

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 Aeronautica et Astronautica Sinica, 2025, 46(24): 231863.

Figures/Tables 11

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Table 1

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挥舞弯矩			摆振弯矩
实际值	计算值	相对误差/%	实际值	计算值	相对误差/%
0.063 3	0.064 6	2.09	0.109 6	0.112 4	2.58
0.126 6	0.127 8	0.98	0.219 2	0.223 2	1.79
0.189 5	0.193 8	2.28	0.328 2	0.329 1	0.25
0.252 7	0.259 8	2.84	0.437 6	0.443 2	1.28
0.315 7	0.323 0	2.33	0.546 8	0.553 9	1.31
0.252 7	0.258 4	2.29	0.437 6	0.449 8	2.77
0.189 5	0.192 4	1.54	0.328 2	0.333 8	1.71
0.126 6	0.129 2	2.09	0.219 2	0.224 9	2.58
0.063 3	0.061 8	2.35	0.109 6	0.113 7	3.76

Flight test measurement for structural load of rotor blade based on fiber Bragg grating

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