Detection of fan case liner damage during turbine engine operation

A device for damage monitoring of a turbine engine having a fan case with a fan case liner, the device comprising:

• an input port configured to receive a vibration sensor signal from a vibration sensor attached to the turbine engine, the vibration sensor signal indicating broadband acceleration of the turbine engine;
• and
• a processor programmed to:
• determine whether the broadband acceleration of the turbine engine indicates that damage to the fan case liner has occurred in the turbine engine due to icing conditions;
• and
• indicate that inspection of the fan case should be conducted in response to the broadband acceleration of the turbine engine indicating that damage to the fan case liner has occurred.

A device for damage monitoring of a turbine engine having a fan case with a fan case liner, the device comprising:

• at least one non-transitory computer readable storage device having executable instructions stored thereon;
• and
• at least one processor associated with the at least one non-transitory computer readable storage device, wherein the executable instructions are configurable to cause the at least one processor to perform a method comprising the steps of:
• receiving a vibration sensor signal provided by an accelerometer attached to the turbine engine, the vibration sensor signal indicating broadband acceleration of the turbine engine during operation;
• retrieving a rotor rotation frequency of the turbine engine;
• forming a harmonic indicator based on at least one harmonic frequency of the rotor rotation frequency;
• extracting, from the vibration sensor signal, a vibration amplitude at the at least one harmonic frequency;
• and
• generating a potential engine damage alert based on characteristics of the harmonic indicator and the vibration amplitude.