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Nobuo Takeda Dept. Advanced Energy, Graduate School of Frontier Sciences

Recent Developments of Optical Fiber Sensor Based SHM Technologies for Aerospace Composite Structures in Japan. Nobuo Takeda Dept. Advanced Energy, Graduate School of Frontier Sciences and Dept. Aeronautics and Astronautics, School of Engineering The University of Tokyo.

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Nobuo Takeda Dept. Advanced Energy, Graduate School of Frontier Sciences

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  1. Recent Developments of Optical Fiber Sensor Based SHM Technologies for Aerospace Composite Structures in Japan Nobuo Takeda Dept. Advanced Energy, Graduate School of Frontier Sciences and Dept. Aeronautics and Astronautics, School of Engineering The University of Tokyo Keynotes Panel: Ten Year Progress and Future Prospects in SHM The 6th International Workshop on Structural Health Monitoring (Sept. 11, 2007, Stanford University)

  2. (1) Structural Health Monitoring Group,NEDO Smart Material/Structure System Program (FY1998-2002) METI(Ministry of Economy, Trade and Industry) NEDO(New Energy and industrial Technology Development organization) RIMCOF(R&D Institute of Metals & Composites for Future Industries) Structural Health Monitoring Univ. Tokyo, 10 Companies Active/Adaptive Structures Nagoya Univ. 4 Companies& Tokyo MMU NEDO Smart Material/Structure System Program Demonstrator Program 4 Companies Actuator Materials & Devices Tohoku Univ. 4 Companies & Univ. of Washington Approximately 5 Million US Dollars per year Smart Manufacturing Osaka City Univ. 2 Companies National Institute of Advanced Industrial Science and Technology Smart Structure Research Center

  3. CFRP Laminates with Embedded FBG Sensors 50mm Polyimide Coating Cladding 0o Ply 90o Ply Uncoated normal FBG sensor Polyimide-coated small-diameterFBG sensor Cladding: f40mm Polyimide Coating: f52mm Cladding: f125mm

  4. Damage Detection and Suppression Demonstrator EMBEDDED SMALL-DIAMETER OPTICAL FIBER SENSORS Overview of Demonstrator Impact Damage Detection – Small-Diameter Optical Fiber Low Cost RTM/Health Monitoring Impact Damage Detection – AE Damage Detection－BOTDR Damage Suppression －SMA Damage Detection – Smart Patch Length：　3 m Diameter： 1.5 m

  5. Impact Damage Detection Test in Damage Detection and Suppression Demonstrator Impact Test Machine Fixed Reaction Wall Actuators for Flexural Load Impact Response Measuring System RIMCOF Dead Weight for Gravity Compensation

  6. Progress of SHM in Japan • Structural Health Monitoring Group,NEDO Smart Material/Structure System Program (FY1998-2002) • Structural Integrity Diagnosis and Evaluation of Advanced Composite Structures (ACS-SIDE)Project,METI Advanced Material & Processing forNext-Generation Aircraft Structure Program (FY2003-2007)

  7. ACS-SIDE ProjectPZT-FBG Hybrid Active Damage Sensing System Fuji Heavy Industries, Hitachi Cable, Univ. Tokyo, Tohoku Univ., AIST Lamb wave detection up to 1 MHz AWG (arrayed waveguide grating) filter Filter 1 Filter 2 + strain -strain

  8. (mm) 1000(N) one point loading damaged (partially notched) ribs 8 28 37 18 11 31 (me) 36 17 7 27 21 39 2 6 26 35 16 10 30 34 15 5 25 20 38 1 4 24 33 14 9 29 32 13 3 23 19 22 12 (mm) ACS-SIDE ProjectHigh Reliability Advanced Grid Structures (HRAGS) Mitsubishi Electric Co., University of Tokyo 6 axis controlled robot (Tape prepreg & Optical fiber) Demonstrator design Damage Identification System Fixed position HRAGS panel (Upper & Lower plate) 20 (me) 27 Load 0.08 m Dei 0.2m BOX structure 600 FBG sensors 1 m 2 m Damaged position Rib number (i)

  9. ACS-SIDE Project Distributed Strain Measurement by BOCDA Technique Optical Unit 460mm Control unit Power supply unit 430mm Mitsubishi Heavy Industries, University of Tokyo Current Status Length Resolution: 5 cm, Dynamic Response: 5 Hz BOCDA: Brillouin Optical Coherence Domain Analysis Fastener Joint Monitoring OF sensor C A Removed fastener A B B C Fastener Flight Test Bed and On-board BOCDA system

  10. (1) Structural Health Monitoring Group,NEDO Smart Material/Structure System Program (FY1998-2002) (2) Structural Integrity Diagnosis and Evaluation of Advanced Composite Structures (ACS-SIDE) Project,METI Advanced Material & Processing forNext-Generation Aircraft Structure Program (FY2003-2007) Application of SHM Technology to Near-Future Affordable Composite Aircraft and Spacecraft

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