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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