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Structural Health Monitoring of Aerospace Stiffened Panels Using Lamb Wave Propagation

Nasiri, Mostafa | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49033 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. In recent years world countries faced with the ageing aircraft fleet problem which increased the repair and maintenance costs of these aircrafts. The non-destructive inspection methods are common inspection methods of old aircrafts. To do this, the aircraft must test with a certain time scheduled inspection programme in a hangar. This method not only increased the repair and maintenance costs but also affects the flight schedule. To overcome this problem, the structural health monitoring can use to online monitoring the structure and when it needs for repair, the aircraft send to hanger. So, repair and maintenance costs minimize while the flight schedule less affected. One of the structural health monitoring methods is based on the Lamb wave propagation through the structure using layered piezoelectric transducers. In this research, at first, an aluminium plate is investigated using an instantaneous reference method and the images of the structure are produced by probabilistic methods. Results are confirmed with other works in the literature. Then, this method is used for reinforced aluminium which has complexities for wave propagation to detect the fatigue crack location around rivet holes in different scenarios. Results show this method is suitable for these structures. Finally, a method for determining the constant of mentioned probabilistic method is presented which works better than the other ones
  9. Keywords:
  10. Piezoelectric Transducers ; Structural Health Monitoring ; Lamb Wave ; Stiffened Plates ; Lamb Wave Power ; Wave Propagation ; Probabilistic Based Diagnosis Imaging (PDI)

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