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Design and Development of Multi-Sensor Array for Structural Health Monitoring of Pipelines

Adldoost, Hamed | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 42796 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Zabihollah, Abolghasem
  7. Abstract:
  8. Structural Health Monitoring (SHM) of pipelines is an important task for economic/safety reasons which depends on the method of study of the integrity profile of the pipeline structure. Process pipes, particularly, pipelines in thermal power plants are susceptible to stress corrosion cracking (SCC). Failure of these pipes may result in catastrophic damages, thus, require systematic regular inspections. The damage assessment may demand embedding of appropriate sensors and specific data analysis techniques. According to what is reported from the respective experiments, data analysis of a single sensor may not be adequate to provide a reasonable damage assessment, and in turn to making a suitable decision. Conventional monitoring technique based on single sensing, such as Ultrasonic Wave Propagation Imaging (UWPI) is not applicable in most cases. The present work focuses on the design and implementation of a multi-sensor array which involves relatively low cost sensors, for damage detection of pipelines. Using sensor patches composed of multi-PVDF and fiber Bragg grating (FBG), vibration, strain and temperature are measured which are required for accurate damage assessment. Using a finite element approach, the static and dynamic behaviors of healthy and cracked pipes is studied. It is observed that the wavelength shift in FBGs and generated voltage at multiple PVDF sensors may be used to assess the presence of the damage in pipes. Close look on the results presented may be an indicator of size and location of the damage. This work is partially followed by a set of experiments with respective sensors. The detection of cracks in pipes experimentally verified using PVdF patches that were mounted on the pipe wall. As pipelines are mainly located in areas hard to access, the wireless sensing is a main factor for in-time damage detection. A wireless monitoring device has been developed and experimentally tested that can work for real condition systems being able to transmit the signals over 2 Km
  9. Keywords:
  10. Pipelines ; Damage Identification ; Multisensory Systems ; Polyvinylidene Fluoride (PVDF) ; Fiber Bragg Grating (FBG) ; Structural Health Monitoring

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