Recent development of structural health monitoring technologies for aircraft composite structures in japan



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tarix05.10.2018
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RECENT DEVELOPMENT OF STRUCTURAL HEALTH MONITORING TECHNOLOGIES FOR AIRCRAFT COMPOSITE STRUCTURES IN JAPAN



Nobuo Takeda

Department of Advanced Energy, Graduate School of Frontier Sciences

The University of Tokyo

Mail Box 302, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan

URL: http://www.smart.k.u-tokyo.ac.jp, E-mail: takeda@smart.k.u-tokyo.ac.jp
In Japan, we have been developing optical fiber based SHM technologies in recent national industry-university collaboration programs, and the author has been the project leader. After some important fundamental developments, such as small-diameter optical fiber sensors for embedment in CFRP structures without introducing any deterioration (Fig.1), we are now applying to sub-component structure prototypes. This presentation provides some recent development of optical fiber based SHM technologies for near-future aircraft composite structures. The topic includes:

(1) Development of small-diameter optical fibers and FBG sensors

(2) Damage detection in composites by FBG sensors

(3) Impact damage detection in stiffened composite fuserage structure (Fig.2)

(4) PZT/FBG hybrid sensing system for bond-line monitoring in CFRP box structures

(5) Highly reliable advanced grid structures (HRAGS)

(6) Distributed strain sensing using Brillouin optical correlation domain analysis

(7) Real-time on-board strain monitoring of composite tanks in reusable launch vehicles





Fig.1. Conventional and small-diameter optical fibers embedded in a CFRP lamina and small-diameter FBG sensors



Fig.2. Final assembly of the Damage Detection and Suppression Demonstrator

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