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Griffaton
Julien Griffaton, Paris FR
| Patent application number | Description | Published |
|---|---|---|
| 20080223135 | METHOD OF DETECTING DAMAGE TO AN ENGINE BEARING - The invention relates to a method of detecting damage in a bearing supporting at least one rotary shaft of an engine in rotation, the method consisting in: defining a measurement period corresponding to a range of speeds of rotation of the shaft during renewable activity at low speeds of operation of the engine; acquiring over the entire measurement period a vibratory signal representative of acceleration of components of the engine; sampling the vibratory signal as a function of the speed of rotation of the shaft during the measurement period; transforming the sampled vibratory signal into a frequency signal to obtain frequency spectrum lines as a function of the speed of rotation of the shaft; calculating the mean of the amplitudes of the spectrum lines; determining amplitude peaks around multiples of the theoretical frequency of a damaged roller; calculating the ratio between each amplitude peak and the amplitude level determined for a sound bearing; and comparing the ratio that is obtained with at least one predetermined damage threshold. | 09-18-2008 |
| 20110178772 | METHOD AND SYSTEM FOR MONITORING A TURBOJET ENGINE - A method and a system for monitoring a turbojet engine. The method acquires a signal representative of a vibratory level of an operating rotor of the turbojet engine, acquires a rotation speed of the rotor during operation, compares the amplitude of the signal with at least one predetermined threshold based on the rotor rotation speed and, in event an amplitude peak exceeds the threshold, analyzes the signal over a time slot defined around the amplitude peak to determine if the phenomenon at the origin of the amplitude peak is a mechanical shock undergone by the rotor of the turbojet engine or an electronic interference of the signal. | 07-21-2011 |
Julien Christian Pascal Griffaton, Paris FR
| Patent application number | Description | Published |
|---|---|---|
| 20110199249 | METHOD FOR DIGITIZING AN ANALOGUE SIGNAL WITH AN ANALOGUE-DIGITAL CONVERTER OF DETERMINED SHANNON FREQUENCY - A method for forming a global spectrum (Sg) of an analogue signal (A) to be digitized, in which: | 08-18-2011 |