System for detecting defects on an aircraft engine impeller wheel
AssigneeSnecma
InventorsGeoffroy NICQ, Valerio GEREZ
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Abstract
A method and an on-board system for detecting impact on an impeller wheel of an aircraft engine. Deflection signals representative of the deflections on the blades of the impeller wheel are acquired. Each of the deflection signals is correlated 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. The impact signals are extracted from among the deflection signals. The impact signals are transmitted to the ground in order that the signals are analysed to detect defects on the blades of the impeller wheel.
Claims11
A method for detecting defects on an impeller wheel of an engine for an aircraft, said method comprising:
- acquiring deflection signals representative of deflections on blades of said impeller wheel,
- identifying impact by correlating each of said deflection signals with a detection pulse signal typical of an impact on a sound blade at a rotation frequency of the engine,
- extracting impact signals from among said deflection signals,
- applying a modal analysis to each of said impact signals to identify modal parameters relative to each impacted blade, and
- monitoring an evolution of said modal parameters in order to detect defects on said blades.
An on-board system for detecting impact on an impeller wheel of an engine for an aircraft, said system comprising:
- an acquisition device for acquiring deflection signals representative of deflections on blades of said impeller wheel,
- a correlation device for correlating each of said 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,
- a calculation device for extracting impact signals from among said deflection signals, and
- a transmission device for transmitting said impact signals to the ground in order that said signals are analysed to detect defects on the blades of the impeller wheel.
Dependencies are inferred from the claim text.