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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 47202 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Abedian, Ali
- Abstract:
- Structural health monitoring (SHM) has been motivated in aircraft and civil industries over the two last decades. Ultrasonic guided wave propagation technique is one of the best damage detection methods in airplane thin wall structures because of their large distance traveling and low attenuation.
In fact by efficient design of sensors pattern one can effectively pick up the changes that happen in propagated signals due to presence of any kind of structural damage. This could be effectively achieved by numerical simulation techniques like finite element modeling. To obtain a damage detection algorithm based on instantaneous baseline data, here, finite element technique is employed for simulation of wave propagation in thin wall structures. Also, the influence of artificial crack (Cut-damage) on propagated lamb waves is investigated. The Instantaneous baseline damage detection based on cross correlation (CC) analysis is carried out to detect the damage and the results show a good agreement with the experimental test results available in the literature. Moreover, wavelet analysis is also used to estimate the size and location of the detected damage instantaneously. Conclusively, the numerical simulation leads effectively to design a tool and a process for damage identification using piezoelectric wafer active sensors. Furthermore, due to nature of elastic wave velocity in metallic structures localization of damage is more accurate than damage size identification - Keywords:
- Structural Health Monitoring ; Finite Element Method ; Lamb Wave ; Damage Detection ; Piezoelectric Sensor ; Communication Waveguides ; Fatigue Crack
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