Highly Sensitive and Robust Damage Detection of Periodic Structures with Piezoelectric Networking
Final rept. 15 Dec 2006-31 May 2008
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING
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Damage detection in engine bladed disks is often performed through ultrasonic and eddy current techniques that are reliable, but expensive and lack in-situ monitoring capability. Alternatively, vibration-based damage detection methods are relatively inexpensive, have real-time in-situ potential, but are generally inaccurate due to low sensitivity. The goal of this research is to advance the state-of-the-art of vibration-based damage detection of bladed disks by utilizing the unique vibration localization characteristics of such periodic structures to enhance damage detection sensitivity and robustness through piezoelectric circuitry networking. In this research, we have explored an innovative piezoelectric circuitry networking methodology that can temporarily amplify the damage effect on the system vibratory signature during the inspection stage. Methods for network parameter synthesis to maximize sensitivity have been established. Fundamental understandings of vibration energy propagationdistribution in bladed disks without and with piezoelectric circuitry are pursued. Monte Carlo simulations are performed to evaluate the networks effectiveness. Multivariate statistical analysis tools are synthesized that can quantify the detection performance enhancement under noisevariances.
- Electricity and Magnetism