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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Fixed-Position Quasi-Static Load Calibration and Identification of an Aluminum Wing-Box Test Section Using
Zhe Fan1,2, Rui Bao1, Junkai Sun2
1National Key Laboratory of Strength and Structural Integrity, Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China.
Sensors (Basel, Switzerland)
|July 28, 2026
Summary
This study validates a quasi-static load calibration method for aircraft wing-box testing using fiber Bragg grating (FBG) sensors. The procedure accurately identifies bending, shear, and torsional moments with minimal error for the tested configuration.
Area of Science:
- Aerospace Engineering
- Materials Science
- Structural Health Monitoring
Background:
- Section-load calibration is crucial for accurate aircraft wing-box testing.
- Fiber Bragg Grating (FBG) sensors offer a promising method for structural monitoring.
Purpose of the Study:
- To evaluate a fixed-position quasi-static load-calibration and identification procedure for a 7050 aluminum wing-box.
- To assess the accuracy of FBG sensor networks in capturing bending, shear, and torsional loads.
Main Methods:
- A multi-point FBG network was implemented on a wing-box test section.
- Finite-element analysis guided sensor placement for optimal response feature extraction.
- Strain-free reference FBGs were used for temperature compensation.
- Regression calibration and interpolation validation were performed under controlled conditions.
Main Results:
- The calibration procedure achieved maximum/average relative errors of 6.53%/1.51% for bending moment, 2.62%/0.86% for shear force, and 4.04%/1.23% for torsional moment.
- The method demonstrated high accuracy for the specific tested configuration.
Conclusions:
- The evaluated quasi-static load-calibration procedure using FBG sensors is effective for the tested wing-box configuration.
- Results are specific to the laboratory conditions and do not generalize to different geometries or loading scenarios.
