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Proceedings Paper

Development of a wireless nonlinear wave modulation spectroscopy (NWMS) sensor node for fatigue crack detection
Author(s): Peipei Liu; Suyoung Yang; Hyung Jin Lim; Hyung Chul Park; In Chang Ko; Hoon Sohn
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Paper Abstract

Fatigue crack is one of the main culprits for the failure of metallic structures. Recently, it has been shown that nonlinear wave modulation spectroscopy (NWMS) is effective in detecting nonlinear mechanisms produced by fatigue crack. In this study, an active wireless sensor node for fatigue crack detection is developed based on NWMS. Using PZT transducers attached to a target structure, ultrasonic waves at two distinctive frequencies are generated, and their modulation due to fatigue crack formation is detected using another PZT transducer. Furthermore, a reference-free NWMS algorithm is developed so that fatigue crack can be detected without relying on history data of the structure with minimal parameter adjustment by the end users. The algorithm is embedded into FPGA, and the diagnosis is transmitted to a base station using a commercial wireless communication system. The whole design of the sensor node is fulfilled in a low power working strategy. Finally, an experimental verification has been performed using aluminum plate specimens to show the feasibility of the developed active wireless NWMS sensor node.

Paper Details

Date Published: 9 March 2014
PDF: 15 pages
Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 906406 (9 March 2014); doi: 10.1117/12.2045747
Show Author Affiliations
Peipei Liu, KAIST (Korea, Republic of)
Suyoung Yang, KAIST (Korea, Republic of)
Hyung Jin Lim, KAIST (Korea, Republic of)
Hyung Chul Park, Seoul National Univ. of Science and Technology (Korea, Republic of)
In Chang Ko, Seoul National Univ. of Science and Technology (Korea, Republic of)
Hoon Sohn, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 9064:
Health Monitoring of Structural and Biological Systems 2014
Tribikram Kundu, Editor(s)

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