Type of Document Master's Thesis Author Yun, Jinsik Author's Email Address firstname.lastname@example.org URN etd-05052011-181245 Title Development of Structural Health Monitoring Systems Incorporating Acoustic Emission Detection for Spacecraft and Wind Turbine Blades Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Ha, Dong Sam Committee Chair Inman, Daniel J. Committee Member Schaumont, Patrick Robert Committee Member Keywords
- Structural Health Monitoring
- Acoustic Emission
- Impedance-Based SHM
- Wireless Sensor Network
Date of Defense 2011-04-28 Availability unrestricted Abstract
Structural Health Monitoring (SHM) is the science and technology of monitoring and can assess the condition of aerospace, civil, and mechanical infrastructures using a sensing system integrated into the structure. SHM is capable of detecting, locating, and quantifying various types of damage such as cracks, holes, corrosion, delamination, and loose joints, and can be applied to various kinds of infrastructures such as buildings, railroads, windmills, bridges, and aircraft.
A major technical challenge for existing SHM systems is high power consumption, which severely limits the range of its applications. In this thesis, we investigated adoption of acoustic emission detection to reduce power dissipation of SHM systems employing the impedance and the Lamb wave methods. An acoustic emission sensor of the proposed system continuously monitors acoustic events, while the SHM system is in sleep mode. The SHM system is evoked to perform the SHM operation only when there is an acoustic event detected by the acoustic emission sensor. The proposed system avoids unnecessary operation of SHM operations, which saves power, and the system is effective for certain applications such as spacecraft and wind turbine blades. We developed prototype systems using a Texas Instruments TMS320F2812 DSP evaluation board for the Lamb wave method and an MSP430 evaluation board for the impedance method.
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