Shielding Damage Characterization in Twisted Pair Cables Using OMTDR-based Reflectometry and Inverse Problems
Résumé
Aeronautical wiring and interconnect systems are highly exposed to severe conditions leading to serious security problems. In such systems, the predictive diagnosis of incipient faults becomes an economic and human requirement in the perspective of predictive maintenance. This paper proposes to study and develop methods and models to detect incipient faults and characterize them in wiring and interconnect systems. A model-based inversion process combined with optimization-based algorithms have formed a suitable, reliable and efficient technique for incipient fault characterization when processed with reflectometry. To do so, a shielded twisted pair cable with a shielding damage has been modeled using Finite element method and simulated using reflectometry. It consists in injecting a wideband test signal down to the cable and recording the reflected echoes at each impedance discontinuity. The analysis of the reflectometry-based measurements permits to detect and locate incipient fault. A Genetic Algorithm (GA) is then performed to estimate the fault's features such as length, width or per-unit-length parameters (RLCG), etc., which becomes equally interesting for predictive maintenance. The proposed methodology is validated by experimental results using an electronic card including Xilinx Zunq 7010 FPGA to inject/receive Orthogonal Multi-Tone Time Domain Reflectometry (OMTDR).
Mots clés
instrumentation
Circuit faults
Conductors
Cable shielding
Springs
Solid modeling
Resistance
Power cables
defect
cable
Reflectometry
diagnosis
predictive diagnosis
incipient fault
predictive maintenance
structural health monitoring
optimization algorithm
wiring
incipient fault characterization
shielded twisted pair cable
shielding damage
modelling
simulation
Finite element method
wideband test signal injection
reflected echo
impedance discontinuity
fault detection
fault localization
Genetic Algorithm
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