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Health Monitoring and Damage Detection of Marine Structure

Tahmasebi Boldaji, Ebrahim | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53924 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed; Behzad, Mehdi
  7. Abstract:
  8. Structural health monitoring is a process that aims to provide accurate and immediate information about the condition and performance of the structure. Processed is a very important eld in the eld of civil, aerospace and marine engineering, because the use of structural health monitoring allows us to increase human and environmental safety while reducing economic damage. e main component of the health monitoring process is the real-time reconstruction of displacement and three-dimensional stress in the structure using a network of strain gauges and other sensors. e inverse nite element method is a relatively new method and stress measurement that has been shown to be fast and accurate for use as part of structural health monitoring systems. In the present thesis, least squares are used as the general framework of the inverse nite element method. One of the aims of this method is to develop unconventional teniques for measuring stress, displacement and focusing on engineering structures, especially oshore structures. In the rst step, the relationships governing the inverse nite elements for the plate and shell structures, whi are based on the rst-order shear deformation theory, are extracted. ese relationships are then used to develop an octagonal quadrilateral inverted element, whi expands the practical application of iFEM to measure the displacement and stress of large-scale structures, including oshore structures. Numerous numerical examples are presented and it is shown that the iQS8 element has shown a good performance against membrane and shear loing phenomena. In addition, the inverse nite element method is applied to the stiened plate problem, the infrastructure of wind turbine in the sea and the mid-section of a container ship. To simulate laboratory strains, Abaqus so-ware was used to extract laboratory data. By using the strains extracted from Abacus nite element analysis soware and inverse nite element relations, the displacement and strain values are reproduced in the whole structure. Is specied. Finally, by dening the dierence between the strain of a healthy structure and a structure with failure as a failure index, the failure in the structure is identied
  9. Keywords:
  10. Inverse Finite Element Method ; Offshore Structures ; Least Squares Method ; Structural Health Monitoring ; Weighted Least Squaures Estimation ; Direct Finite Element Method

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