Method and a system for merging health indicators of a device
First Claim
1. A method for monitoring the operation of a device, wherein measurement sensors are positioned on the device and/or in close proximity to the device to measure parameters of the device while the device is in operation, measurements of at least one of the sensors making it possible to determine at least one health indicator Indi, each health indicator Indi being associated with a detection threshold Sdi, the method comprising:
- during a preliminary step, distributing the health indicators Indi of the device in at least one indicator group G and applying an algorithm g to the health indicators Indi of an indicator group G in order to determine a characteristic operating point Pf of the device for the indicator group G;
during a training step when the device is considered healthy, operating the device during a training period, measuring the parameters of the device using the sensors while the device is operating during the training period, using the measurements of the sensors to determine training health indicators of the indicator group G, determining training operating points of the device by applying the algorithm g to the training health indicators, and determining a healthy-state model Mr for the device using the training operating points, a belonging function f indicating whether a characteristic operating point Pf of the device belongs to the healthy-state model Mr representing the device in a healthy state for the indicator group G using the training operating points, and an alarm threshold Sa associated with the belonging function f based on the training operating points;
during a step of taking account of the detection thresholds Sdi, determining a transformation T of the belonging function f so as to take into account both of the alarm threshold Sa of the healthy-state model Mr and the detection thresholds Sdi of the health indicators Indi of the group G; and
during a monitoring step the following steps are performed;
operating the device;
measuring the parameters of the device using the sensors while the device is operating;
using the measurements of the sensors to determine the health indicators Indi of an indicator group G;
determining a merged health indicator MHI by applying the transformation T to the health indicators Indi of an indicator group G;
comparing the merged health indicator MHI with the alarm threshold Sa;
deducing an operating state of the device based on the comparison; and
providing an alarm to an operator upon the operating state of the device being deduced from the comparison to be faulty.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system for merging health indicators of a device. During the method, health indicators Indi are firstly distributed in at least one indicator group G, each health indicator Indi being associated with a respective detection threshold Sdi, it being possible to determine a characteristic operating point of the device by using the health indicators Indi of an indicator group G. An alarm threshold Sa is determined using training health indicators. Then, a merged health indicator MHI is determined by taking into account both of the alarm threshold Sa and also of the detection thresholds Sdi of the health indicators Indi of the group G. Finally, the merged health indicator MHI is compared to the alarm threshold Sa and it is deduced whether or not the device presents a fault or a risk of such a fault appearing.
-
Citations
20 Claims
-
1. A method for monitoring the operation of a device, wherein measurement sensors are positioned on the device and/or in close proximity to the device to measure parameters of the device while the device is in operation, measurements of at least one of the sensors making it possible to determine at least one health indicator Indi, each health indicator Indi being associated with a detection threshold Sdi, the method comprising:
-
during a preliminary step, distributing the health indicators Indi of the device in at least one indicator group G and applying an algorithm g to the health indicators Indi of an indicator group G in order to determine a characteristic operating point Pf of the device for the indicator group G; during a training step when the device is considered healthy, operating the device during a training period, measuring the parameters of the device using the sensors while the device is operating during the training period, using the measurements of the sensors to determine training health indicators of the indicator group G, determining training operating points of the device by applying the algorithm g to the training health indicators, and determining a healthy-state model Mr for the device using the training operating points, a belonging function f indicating whether a characteristic operating point Pf of the device belongs to the healthy-state model Mr representing the device in a healthy state for the indicator group G using the training operating points, and an alarm threshold Sa associated with the belonging function f based on the training operating points; during a step of taking account of the detection thresholds Sdi, determining a transformation T of the belonging function f so as to take into account both of the alarm threshold Sa of the healthy-state model Mr and the detection thresholds Sdi of the health indicators Indi of the group G; and during a monitoring step the following steps are performed; operating the device; measuring the parameters of the device using the sensors while the device is operating; using the measurements of the sensors to determine the health indicators Indi of an indicator group G; determining a merged health indicator MHI by applying the transformation T to the health indicators Indi of an indicator group G; comparing the merged health indicator MHI with the alarm threshold Sa; deducing an operating state of the device based on the comparison; and providing an alarm to an operator upon the operating state of the device being deduced from the comparison to be faulty. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A rotary wing aircraft comprising:
-
a device used for operating the aircraft in flight; a plurality of measurement sensors positioned on the device and/or in close proximity to the device to measure parameters of the device while the aircraft is in flight, measurements of at least one of the sensors making it possible to determine at least one health indicator Indi, each health indicator Indi being associated with a detection threshold Sdi; and a computer system configured to; during a preliminary step, distribute the health indicators Indi of the device in at least one indicator group G and apply an algorithm g to the health indicators Indi of an indicator group G in order to determine a characteristic operating point Pf of the device for the indicator group G; during a training step when the device is considered healthy, measure the parameters of the device using the sensors while the aircraft is in flight during the training period, use the measurements of the sensors to determine training health indicators of the indicator group G, determine training operating points of the device by applying the algorithm g to the training health indicators, and determine a healthy-state model Mr for the device using the training operating points, a belonging function f indicating whether a characteristic operating point Pf of the device belongs to the healthy-state model Mr representing the device in a healthy state for the indicator group G using the training operating points, and an alarm threshold Sa associated with the belonging function f based on the training operating points; during a step of taking account of the detection thresholds Sdi, determine a transformation T of the belonging function f so as to take into account both of the alarm threshold Sa of the healthy-state model Mr and the detection thresholds Sdi of the health indicators Indi of the group G; and during a monitoring step; measure the parameters of the device using the sensors while the aircraft is in flight; use the measurements of the sensors to determine the health indicators Indi of an indicator group G; determine a merged health indicator MHI by applying the transformation T to the health indicators Indi of an indicator group G; compare the merged health indicator MHI with the alarm threshold Sa; deduce an operating state of the device based on the comparison; and provide an alarm to a pilot of the aircraft upon the operating state of the device being deduced from the comparison to be faulty.
-
Specification