| 摘要 |
<p>An on-board system for detecting impact on an impeller wheel of an aircraft engine comprises acquisition means 13 for acquiring deflection signals representative of the deflections on the blades of the impeller wheel; calculation means 15 for correlating the deflection signals with a pulse signal typical of an impact on a sound blade at the rotation frequency of the engine, in order to identify impacts on the impeller wheel; calculation means 15 for extracting the impact signals from among the deflection signals, and; transmission means 19 for transmitting the impact signals to the ground in order that said signals are analysed to detect defects on the blades of the impeller wheel. The signal analysis comprises application of modal analysis to each of the impact signals to identify modal parameters relative to each impacted blade and monitoring the evolution of the modal parameters in order to detect defects on the blades. The acquisition, identification and extraction steps may be carried out on board the aircraft, or the impact signals may be transmitted to the ground or saved.</p> |
