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Proceedings Paper

Demonstration of detectability of SHM system with FBG/PZT hybrid system in composite wing box structure
Author(s): Hideki Soejima; Toshimichi Ogisu; Hiroshi Yoneda; Yoji Okabe; Nobuo Takeda; Yasuhiro Koshioka
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Paper Abstract

We have developed a novel damage monitoring system that can monitor the integrity of composite structures in aircrafts. In this system, fiber Bragg grating (FBG) sensors are used as sensors and piezoelectric transducers (PZT) are used as the generators of elastic waves that propagate in the structure to be inspected. The damage monitoring system can detect the structural integrity by the change in elastic waves that are detected by the FBG sensor and arrayed waveguide grating (AWG)-type filter. We confirmed that the structure health monitoring (SHM) system was able to monitor the damage initiation and propagation by a change in the waveform of the elastic waves in coupon specimens and structural element specimens. In this study, we demonstrate the detectability of the damage monitoring system by using a subcomponent test specimen that simulates an actual aircraft wing box structure composed of carbon fiber reinforced plastics (CFRPs). The FBG sensors and PZTs are bonded to the surfaces of hat-shaped stringers by an adhesive. Damages such as de-bonding and delamination are introduced in the bonded sections of the skin and stringers by impact. Damage monitoring and diagnosis are carried out by the SHM system under ambient conditions. We successfully verify the detectability of our system.

Paper Details

Date Published: 8 April 2008
PDF: 9 pages
Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 69322E (8 April 2008); doi: 10.1117/12.776078
Show Author Affiliations
Hideki Soejima, Fuji Heavy Industries, Ltd. (Japan)
Toshimichi Ogisu, Fuji Heavy Industries, Ltd. (Japan)
Hiroshi Yoneda, Fuji Heavy Industries, Ltd. (Japan)
Yoji Okabe, Univ. of Tokyo (Japan)
Nobuo Takeda, Univ. of Tokyo (Japan)
Yasuhiro Koshioka, R&D Institute of Metal and Composites for Future Industries (Japan)

Published in SPIE Proceedings Vol. 6932:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008
Masayoshi Tomizuka, Editor(s)

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