Design and testing of integrated Bragg grating sensor systems for advanced grid structure

Masataro Amano; Tadahito Mizutani; Yoji Okabe; Nobuo Takeda; Tsuyoshi Ozaki

doi:10.1117/12.658127

5 April 2006 Design and testing of integrated Bragg grating sensor systems for advanced grid structure

Masataro Amano, Tadahito Mizutani, Yoji Okabe, Nobuo Takeda, Tsuyoshi Ozaki

Proceedings Volume 6173, Smart Structures and Materials 2006: Smart Structures and Integrated Systems; 61731C (2006) https://doi.org/10.1117/12.658127
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

In this research, the authors target on the construction of structural health monitoring system of Advanced Grid Structure (AGS) made of Carbon fiber reinforced plastic (CFRP). AGS has often been applied to aerospace structures because of the following advantages: (1) Since ribs carry only axial forces, the weakness in the transverse direction of the CFRP unidirectional laminates is negligible. (2) AGS has damage tolerance because the fracture of a rib hardly affects other ribs, namely AGS is a fail-safe structure. In this research, in order to detect existence and regions of rib fractures in AGS, we embedded multiplexed fiber Bragg grating (FBG) sensors into AGS in rib longitudinal directions for measurement of strains. Monitoring of the change in rib longitudinal strains is the most effective SHM system for AGS. In order to confirm our proposal, we carried out following discussions. First, we analytically revealed that the change in rib longitudinal strains was the most sensitive signal for damage detection because of AGS's structural redundancy. Then, we introduced a statistical outlier analysis technique into the SHM system for damage recognition. Finally, we established AGS with the SHM system and verified experimentally. The result of the test showed that damage existence and regions in AGS could be detected with the proposed SHM system.

Citation Download Citation

Masataro Amano, Tadahito Mizutani, Yoji Okabe, Nobuo Takeda, and Tsuyoshi Ozaki "Design and testing of integrated Bragg grating sensor systems for advanced grid structure", Proc. SPIE 6173, Smart Structures and Materials 2006: Smart Structures and Integrated Systems, 61731C (5 April 2006); https://doi.org/10.1117/12.658127

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