Title page for ETD etd-08252011-142532


Type of Document Master's Thesis
Author Konchuba, Nicholas
URN etd-08252011-142532
Title Temperature Compensation Improvements for Impedance Based Structural Health Monitoring
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Inman, Daniel J. Committee Chair
Kurdila, Andrew J. Committee Member
Seidel, Gary Committee Member
Keywords
  • Structural Health Monitoring
  • Impedance-Based SHM
  • Piezoelectric Materials
  • Wavelets
  • Temperature Compensation
  • Effective Frequency Shift
  • Discrete Wavelet Transform
Date of Defense 2011-07-22
Availability restricted
Abstract
Structural Health Monitoring is a useful tool for reducing maintenance costs and improving the life and performance of engineering structures. Impedance-Based SHM utilizes the coupled electromechanical behavior of piezoelectric materials to detect adverse changes and material and mechanical failures of structures. Environmental variables such as temperature present a challenge to assessing the veracity of damage detected through statistical modeling of impedance signals. An effective frequency shift method was developed to compensate impedance measurements for changes resulting from environmental temperature fluctuations. This thesis investigates how the accuracy of this method can be improved and be applied to a 100oF range of temperatures. Building up the idea of eliminating temperature effects from impedance measurements, this thesis investigates the possibility of using statistical moments to create a temperature independent impedance baseline.
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