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Contrôle santé intégré passif par ondes élastiques guidées de tuyauteries pour applications nucléaires et pétrolières

Abstract : Structural Health Monitoring (SHM) consists in embedding sensors into a structure in order to monitor its health inreal time throughout its lifetime. The research works carried out in this thesis aimed at developing a new approachof SHM for the detection of corrosion/erosion in pipes. This manuscript presents a new quantitative imaging method,called passive elastic guided wave tomography, based on the use of an embedded network of piezoelectric sensors(PZT) listening and analyzing only the ambient elastic noise which is naturally generated by the fluid circulation inpipes. This passive method offers many advantages for a SHM system, such as reduction of energy consumption,simplified electronics and ability to perform an inspection while the structure is in operation. In addition, thispassive method makes SHM systems possible to use Fiber Bragg Grating sensors (FBG) which have several advantagesover traditional PZT sensors (low intrusivity, resistance to harsh environments, etc.) but which are not able to emitwaves. A first demonstration of the feasibility of corrosion/erosion imaging by FBG is illustrated experimentallythanks to a result obtained by hybrid tomography in which wave emission is performed by PZT and reception byFBG. All these works offer promising perspectives for the application of passive tomography on industrial structuresusing a pure FBG system. Among the various results presented in this thesis, we also show that corrosion/erosiondefects can be characterized by tomography on a straight pipe without the need for a baseline measurement in apristine state. It is feasible by using a new method of auto-calibration of the data used for tomography. The absenceof baseline measurement makes the method very reliable and avoid false alarms of the system. Finally, preliminarystudies on tomography for more complex structures such as a bended pipe have been realized and validated throughsimulations.
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Submitted on : Tuesday, October 12, 2021 - 3:11:58 PM
Last modification on : Friday, December 3, 2021 - 4:04:14 PM

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  • HAL Id : tel-03375107, version 1

Citation

Huu Tinh Hoang. Contrôle santé intégré passif par ondes élastiques guidées de tuyauteries pour applications nucléaires et pétrolières. Sciences de l'ingénieur [physics]. Université Polytechnique Hauts-de-France; Institut national des sciences appliquées Hauts-de-France, 2020. Français. ⟨NNT : 2020UPHF0023⟩. ⟨tel-03375107⟩

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