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Finding tuning frequency for symmetric and anti-symmetric lamb waves using FEM

Mollaei, F ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. Publisher: 2012
  3. Abstract:
  4. In the area of life assessment, none-destructive methods of inspection and evaluation (NDI/NDE) play important role to ensure if astructure is still healthy enough to get used of. Using ultrasonic stress waves is one of the easiest and cheapest methods of NDI. Accordingly, different modes of lamb wave are mostly of interest..There are various methods for generating lamb waves. One of these methods is using piezoelectric wafer actuator/sensors (PWAS). Accordingly, one of the most important parts of this method is to generate right mode via an appropriate choose of actuating frequency. In this text using a new method for finding tuning frequencies of different lamb wave modes proposed. For this reason finite element Method (FEM) used to predict the behavior of propagated lamb waves in a simple thin structure. The proposed method mainly considers the stress fields of each mode of lamb wave to decompose the generated wave in any actuating frequency. Good coincidence of the produced results with the previous results depicts the new methods accuracy
  5. Keywords:
  6. Lamb wave ; Actuating frequency ; Inspection and evaluations ; Life assessment ; Piezoelectric ; Piezoelectric wafers ; Thin structure ; Tuning frequency ; Ultrasonic stress waves ; Aerodynamics ; Finite element method ; Piezoelectricity ; Surface waves ; Tuning ; Ultrasonic applications ; Ultrasonic waves
  7. Source: Export | Download | More... 28th Congress of the International Council of the Aeronautical Sciences 2012, ICAS 2012 ; Volume 3 , 2012 , Pages 2412-2416 ; 9781622767540 (ISBN)
  8. URL: http://www.icas.org/ICAS_ARCHIVE/ICAS2012/PAPERS/714.PDF