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 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 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 system for detecting and locating failures that occur in a complex system includes elements (CAP, MODVAL, MODDP, MODFD) for detecting and locating a failure affecting at least one sub-system of the complex system. The system also includes an element (MODPD) for making a decision on any action to be taken in the event of such detection. A rocket engine can be monitored with this system.

Abstract: A system for detecting and locating failures that occur in a complex system includes elements (CAP, MODVAL, MODDP, MODFD) for detecting and locating a failure affecting at least one sub-system of the complex system. The system also includes an element (MODPD) for making a decision on any action to be taken in the event of such detection. A rocket engine can be monitored with this system.

Abstract: The invention relates to a device for validating measurements of a dynamic magnitude x coming from an article having main sensors placed thereon on three main axes for measuring of said dynamic magnitude x. The device includes at least two additional sensors for measuring at least two additional components of the dynamic magnitude. The additional sensors are placed on the article on at least two additional axes that are concurrent with the three main axes and that are not contained in any of the planes defined by any pair of the three main axes. The device further includes a unit for determining an estimator U representative of the dynamic magnitude from the components; and means for validating the determination of the estimator U representative of the dynamic magnitude, as well as an error detector and a localization unit for locating valid components of the dynamic magnitude.

Abstract: The invention relates to a device for validating measurements of a dynamic magnitude x coming from an article having main sensors placed thereon on three main axes for measuring of said dynamic magnitude x, the device including at least one additional sensor for measuring at least one additional component of the dynamic magnitude, said additional sensor being placed on the article on at least one additional axis that is concurrent with the three main axes and that is not contained in any of the planes defined by any two of the three main axes; means for determining an estimator U representative of the dynamic magnitude from the components; and means for validating the determination of the estimator U representative of the dynamic magnitude.