Abstract: A method for characterising the behaviour of a rotating shaft using equivalent ellipses. The method for characterising the behaviour of a rotating shaft comprises the following steps: acquiring at least two input signals over a predetermined period comprising measurements representing the movement of the rotating shaft (step 10); determining two components of the input signals, the components being orthogonal to each other (step 20); merging the two components into a bivariate signal (step 30); time-frequency decomposing the bivariate signal into spectral elements (step 40); determining an equivalent ellipse for each spectral element (step 50); and extracting at least one characterisation indicator of the rotating shaft based on parameters of the equivalent ellipse (step 80).

Abstract: A method for controlling a rotating shaft by breakdown of measurements of said shaft into stationary and disturbance components. The method for controlling a rotating shaft comprises acquisition of a signal to be filtered (step 160); filtering and breakdown of the signal to be filtered into a stationary component and a disturbance component for each time-frequency pairing of the signal to be filtered (step 170); comparison of the stationary component with respect to a setpoint for each time-frequency pairing (step 190); comparison of the disturbance component with respect to said setpoint for each time-frequency pairing (step 200); and generation of a command of an actuator associated with said shaft such that the actuator modifies a rotation and/or positioning parameter of the rotating shaft (step 210).

Abstract: A method for filtering at least one signal to be filtered. The filtering being determined based on measurements representing the movement of a rotating shaft. The method includes defining at least one characterisation indicator of the rotating shaft. The characterisation indicator being obtained from a frequency analysis of the behaviour of the rotating shaft (step 120). The method includes determining a filtering template as a function of the characterisation indicator (step 130) and applying the filtering template to said signal to be filtered (step 140).

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.