Title page for ETD etd-06132004-220646


Type of Document Master's Thesis
Author Martin, Luke Andrew
URN etd-06132004-220646
Title Developing a Self-Powered, Wireless Damage Detection System for Structural Health Monitoring Applications
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Inman, Daniel J. Committee Chair
Halevi, Yoram Committee Member
Kwak, Moon Committee Member
Keywords
  • damage detection
  • impedance
  • piezoelectric
  • structural health monitoring
  • resonant frequency shift
  • wireless
Date of Defense 2004-06-04
Availability unrestricted
Abstract
The research presented in this manuscript introduces an independent structural health monitoring (SHM) system capable of performing impedance-based testing and detecting shifts in resonant frequencies. This independent structural health monitoring system incorporates a low power wireless transmitter that sends a warning signal when damage is detected in a structure. Two damage detection techniques were implemented on the SHM system and successfully used for evaluating structural damage. The first impedance-based technique is used to detect a gouge introduced to a composite plate. The second technique is a modal parameter technique that analyzes shifts in natural frequency; this technique was used to detect structural changes in an aluminum cantilever beam. In additional to the above test structures, an aircraft rib provided by the United States Air Force was also tested. This test was performed using the HP 4192A impedance analyzer so that the advantage of high frequency impedance-based tested could be demonstrated.

Insight is given into the power characteristics of SHM systems and the need to incorporate power harvesting into these SHM devices is addressed. Also, a comparison between digital signal processors and microprocessors is included in this document.

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