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Diagnosis and prognosis of faults in complex wired networks

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Start date : 1 September 2018

offer n° SL-DRT-18-0647

Despite the maturity of the reflectometry to detect a defect in a cable, it does not allow to determine the causes of the appearance of an incipient defect (ie damage of the shielding, radius of curvature, pinching, etc.) nor to predict its evolution in the future. The work of this thesis aims to develop new strategies for diagnosis and prognosis of defects in wired networks. For this, the candidate will develop electromagnetic models of the damaged cable to determine the severity of the emerging defect through an estimation method adequate to this context (i.e. Bayesian methods, Kalman filter, etc.). A study of the impact of an incipient defect on the electrical characteristics of the cable will be established by the candidate and will make it possible to carry out the diagnosis of the defect (to go back to the causes of its appearance). For the prognosis, the degradation process of the cable under constraints will be modeled by the candidate. Then, the predictive analysis will predict the evolution of the defect in the future and estimate, ultimately, the remaining life of the cable. A demonstration on an aeronautical cable in collaboration with an industrialist will enhance the work done in this thesis.

The candidate must have an Engineering / Master degree level. The necessary skills for this PhD projetc involve: signal processing, electromagnetism and applied mathematics (probabilities, statistics, numerical methods). A fluency in oral and written English is required. A thorough knowledge of the theory of transmission lines and wave propagation would be a plus.

  • Keywords : Engineering science, Electromagnetism - Electrical engineering, Mathematics - Numerical analysis - Simulation, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : SL-DRT-18-0647
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