Temperature Compensation Improvements for Impedance Based Structural Health Monitoring

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.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Mechanical Engineering

Department dc:contributor.department

Mechanical Engineering

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

2011

Author dc:creator

• Konchuba, Nicholas

Chair dc:contributor.committeechair

• Inman, Daniel J.

Committee members dc:contributor.committeemember

• Kurdila, Andrew J.
• Seidel, Gary D.

• Structural Health Monitoring
• Impedance-Based SHM
• Piezoelectric Materials
• Wavelets
• Temperature Compensation
• Effective Frequency Shift
• Discrete Wavelet Transform

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Dc Identifier Other

etd-08252011-142532

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/44455