发明名称 |
METHOD FOR MONITORING A DEGRADATION OF AN ON-BOARD DEVICE OF AN AIRCRAFT WITH AUTOMATIC DETERMINATION OF A DECISION THRESHOLD |
摘要 |
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. |
申请公布号 |
EP2850499(A1) |
申请公布日期 |
2015.03.25 |
申请号 |
EP20130727295 |
申请日期 |
2013.05.15 |
申请人 |
SNECMA |
发明人 |
MASSE, JEAN-RÉMI, ANDRÉ;BEAUSEROY, PIERRE, JEAN, EMILE;BOULET, XAVIER;GRALL-MAES, EDITH;HMAD, OUADIE |
分类号 |
B64D45/00;G05B23/02;G07C5/08 |
主分类号 |
B64D45/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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