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Crack Localisation In Homogeneous Plates by Analyzing the Dynamic Responses of the Plate Excited by the Moving Load

Verij Kazemi, Saman | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56366 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Massoud; Nikkhoo, Ali
  7. Abstract:
  8. The purpose of the study: The purpose of this study is to identify the crack position in homogeneous plates through health monitoring methods based on vibration. Identifying structural damage is one of the issues that attention can prevent the sudden collapse of structures and causing heavy loss of life and property. For this reason, extensive studies have been conducted in this field in recent decades. In this study, plates are examined as one of the most used structural members, and their damage is identified through a proposed method based on wavelet transform. Research method: In this study, through the wavelet transform method, the dynamic responses of a homogeneous plate excited by a moving load, which is (a) moving force; (b) moving oscillator; (c) moving mass modeled; Through two different approaches, it is examined to identify the damage. In the first approach (fixed sensor), the accelerometer sensor is installed at a point on the plate; While in the second approach, which is known as the moving sensor; The accelerometer sensor is placed on the vehicle. The accuracy of the presented method as well as the effect of the effective parameters on it, such as crack depth, oscillator characteristics, crack direction, etc., are evaluated through finite element models. Results: The results show that the presented method is able to identify the crack position in the plates with high accuracy. Among the capabilities of the presented method, we can mention the ability to identify oblique and shallow cracks. Although the damage is detected with acceptable accuracy in both approaches, the moving sensor approach has a wider scope of application
  9. Keywords:
  10. Structural Health Monitoring ; Wavelet Transform ; Moving Force/Oscillating Mass ; Moving Oscillator ; Moving Mass Load ; Crack Localisation ; Structural Damage Detection (SDD)

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