Title page for ETD etd-05052011-181245


Type of Document Master's Thesis
Author Yun, Jinsik
Author's Email Address jinsik@vt.edu
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
  • Wireless Sensor Network
  • Impedance-Based SHM
  • Acoustic Emission
  • Structural Health Monitoring
Date of Defense 2011-04-28
Availability restricted
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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