4 research outputs found

    Contribution à la modélisation de matériaux agrégataires : proposition d'une loi d'évolution de l'endommagement avec prise en compte de la visco-élasticité

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    Ce papier traite la modélisation du comportement anisotrope induit par endommagement au moyen de la décomposition V-D-T appartenant à la famille des modèles Microplans. Le matériau étudié est un matériau agrégataire énergétique. Le modèle utilisé est habituellement appliqué aux matériaux fragiles. Ce modèle prend en considération la viscoélasticité du matériau dans un contexte Microplans, initialement anisotrope élastoplastique endommageable. Une identification pour un matériau énergétique est proposée

    Modified Structural Intensity for Singularity Localization in Noisy Signals: Application to Coherent Averaging for Event-Synchronous ECG Interference Cancellation in Diaphragmatic EMG Signals

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    Special Issue: Signal Processing for Monitoring and Diagnosis: Medical ApplicationsInternational audienceThis paper addresses the problem of singularity location in a noisy signal. Landmark alignment performances of a modified structural intensity formulation are analyzed in the context of 'averaged template subtraction'. The chosen application is the event-synchronous ECG interference cancellation (ESC) in the diaphragmatic electromyographic signal. The structural intensity event-synchronous interference canceller (SIESC) algorithm based on the modified structural intensity formulation is compared with an existing ESC algorithm that requires an ECG reference signal for the coherent averaging process. Efficiency in interference cancellation is evaluated using both simulations and real electromyogram of the diaphragm data. All the results show that the alignment error of the SIESC induces an acceptable discrepancy between the two methods. One interest of this application is to demonstrate the ability of the structural intensity to provide a detector combining robustness and precision. A drawback of this approach is the calculation cost
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