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Calibration of a Load Measurement System for an Unmanned Aircraft Composite Wing Based on Fibre Bragg Gratings and Electrical Strain Gauges

Faculty of Mechanical Engineering and Aeronautics, Rzeszów University of Technology, al. Powst. Warszawy 8, 35-959 Rzeszow, Poland
Aerospace 2020, 7(3), 27; https://doi.org/10.3390/aerospace7030027
Received: 14 February 2020 / Revised: 9 March 2020 / Accepted: 11 March 2020 / Published: 13 March 2020
(This article belongs to the Special Issue Optical and Fiber Optical Sensors for Aerospace Applications)
This paper presents the issues concerning calibration of a measurement system for monitoring the cross-sectional forces and moments of an unmanned aircraft’s wing. A composite cantilever wing with built-in measurement systems based on electrical resistance and Fibre Bragg Grating strain gauges has been made for the purpose of the study. Measurement systems placed along the span of the wing consist of strain gauges arranged in a manner that allows the monitoring of shear force, bending and twisting moments. The calibration process was described in terms of both experimental tests and mathematical formalism. The calibration results were compared for the complete system, consisting of three sensor units, and for various combinations of separated measuring points. For each case, a reading inaccuracy analysis was carried out and conclusions, including recommendations for the design of this kind of measurement system, were formulated. View Full-Text
Keywords: experimental tests; unmanned aircraft systems; thin-walled composite structures; load monitoring system; FBG strain gauge measurements; electrical resistance strain gauge measurements experimental tests; unmanned aircraft systems; thin-walled composite structures; load monitoring system; FBG strain gauge measurements; electrical resistance strain gauge measurements
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Święch, Ł. Calibration of a Load Measurement System for an Unmanned Aircraft Composite Wing Based on Fibre Bragg Gratings and Electrical Strain Gauges. Aerospace 2020, 7, 27.

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