Multi FBG sensor-based impact localization with a hybrid correlation interpolation method

Abstract

To locate the impact source of a composite material structure with a series of Fiber Bragg grating (FBG) sensors, a hybrid correlation interpolation (HCI) method is proposed, in this paper, based on a weighted correlation analysis and a unidirectional cubic spline interpolation. First, the signals collected by FBG sensors are preprocessed on the frequency domain to reduce noise interference. Second, the impact similarity map is built by using the weighted cross-correlation value to estimate the location of the impact roughly. Third, the similarity map is further subdivided by the unidirectional cubic spline interpolation to increase the impact localization. Fourth, the FBG sensor network is experimental analyzed to optimize the layout and the structure of the FBG sensor network. The validity of the multi FBG sensor-based impact localization method is verified on a carbon fiber composite plates with a size of 650 × 500 (mm). The experimental result shows that the Mean Absolute Error (MAE) is 9.74mm for our suggested method and 15.51mm for the bicubic polynomial interpolation (BPI) algorithm, which is reduced by 5.77mm. The maximum errors are 36.40mm for the BPI algorithm while are reduced to 21.55mm for our suggested method. Furthermore, the effect of FBG sensor combination layout and number on impact location accuracy is analyzed and compared. It shows that the sensor network layout of rectangular structure using four FBG sensors is a better choice after the comprehensive consideration of economic benefits, localization accuracy, and Error Rate (ER).

Monitoring of Composite Structures for Re-Usable Space Applications Using FBGs: The Influence of Low Earth Orbit Conditions

“…SHM is particularly crucial for re-usable space structures to ensure their structural integrity. In this regard, researchers have investigated different topics such as fatigue effects [ 11 , 12 ], impact damage [ 13 , 14 , 15 , 16 ], and delamination [ 17 ], with a focus on different sensing techniques to capture the behavior of composite components throughout their complete life cycle [ 18 , 19 ]. Within this context, this paper explores the influence of low Earth orbit (LEO) conditions on the performance of embedded fiber FBGs for measuring the deformation and temperature of re-usable launcher components.…”

Impact location of metal structures based on time–frequency image features and deep residual network

“…Kim et al [10] proposed a method for locating impact sources by comparing the normalized cross-correlation between a reference database and the acquired impact signals. Du et al [11] proposed a positioning method based on weighted correlation analysis and one-way cubic spline difference. Firstly, the collected signals were preprocessed, then weighted cross-correlation values were used to establish impact similarity maps, and then one-way cubic spline interpolation was used to further subdivide the similarity maps and finally determine the impact location.…”

The Application of Piecewise Regularization Reconstruction to the Calibration of Strain Beams

“…Standard beams serve as important testing tools in engineering practice, widely used in fields such as mechanical performance testing and sensor calibration [1][2][3]. Their main function is to act as a load reconstruction model in the process of sensor calibration.…”