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Patents Year : 2015

Method for monitoring a degradation of an on-board device of an aircraft with automatic determination of a decision threshold

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Abstract

A method for monitoring degradation of an on-board device of an aircraft includes comparing an abnormality score obtained for a given aircraft flight to a decision threshold and emitting an alarm when the decision threshold is exceeded. The decision threshold is determined automatically for a given alarm probability Pa, corresponding to probability of an alarm being emitted during the monitoring when the on-board device is undamaged, by: calculating plural abnormality scores for plural flights of the aircraft without degradation to obtain a probability density distribution of the abnormality score, the distribution being specific to a physical nature of the on-board device; adjusting the distribution using a non-parametric estimator of the probability density to obtain a continuous adjusted distribution function; calculating a continuous adjusted allocation function from the continuous adjusted distribution function; and reading precedent of the continuous adjusted allocation function for value 1-Pa, the precedent corresponding to the decision threshold.
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Dates and versions

hal-02518496 , version 1 (25-03-2020)

Identifiers

  • HAL Id : hal-02518496 , version 1

Cite

Jean-Remi Massé, Pierre Beauseroy, Xavier Boulet, Edith Grall-Maës, Ouadie Hmad. Method for monitoring a degradation of an on-board device of an aircraft with automatic determination of a decision threshold. United States, Patent n° : US9346558. 2015. ⟨hal-02518496⟩
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