Strain transfer characteristics of surface-attached FBGs in aircraft wing distributed deformation measurement

Abstract

Dynamic deformations of aircraft wing can lead to changes in baseline length, which seriously affects the performance of ground height measurement and multi-phase central array imaging. It is very important to measure the deformation of aircraft wing with high accuracy in dynamic environment. The layout of sensors is not allowed to affect the safety of aircraft structure and the sensor packaging design directly affects the accuracy of aircraft wing deformation measurement. For these, the strain calibration methods used in recent years are analyzed first, and then a strain calibration method of the surface-attached FBGs applied to distributed strain measurement of aircraft wing is proposed. In this paper, two sets of Aluminium Alloy Test Plates with different sizes were designed as matrix materials for tensile test. The strain sensitivity of surface-attached FBGs on test substrates with different sizes was compared by several groups of tests. The test results show that the tensile test based on AATP-A is better than AATP-B. By comparing the measurement results of surface-attached FBGs and strain gauge on AATP-A, the high measurement accuracy of surface-attached FBGs is verified. The test results show that the strain measurement method based on the surface-attached FBGs is simple and reliable, and this method can be used to calibrate the surface-attached FBGs before use, and improve the accuracy and accuracy of the measurement of wing deformation.