Dynamic monitoring device for fatigue cracks of aircraft engine on hightemperature test rig

A dynamic monitoring device for fatigue cracks of an aircraft engine on a test rig configured to use a testing method of a monitoring device and a test spindle forming asynchronous relative motion under simulated high-speed rotation, wherein:

• the monitoring device comprises a profiled housing, as well as an eddy current testing sensor, a signal processing module, a wireless communication module, and a miniature centrifugal cooler that are encapsulated inside the profiled housing,
• a detection end face of the profiled housing comprises a plurality of miniature air film holes,
• at least one of an external side wall opposite to the detection end face or two external side walls adjacent to the detection end face of the profiled housing each comprises a wind-guide channel,
• an air inlet and an air outlet of the wind-guide channel form a symmetrical double-horn-shaped structure,
• an inner wall of the wind-guide channel is coated with a heat-dissipating coating,
• the eddy current testing sensor is installed at a position inside of the profiled housing adjacent to the detection end face,
• the eddy current testing sensor comprises a ferrite core and insulated wires,
• the insulated wires are wound around an outside of the ferrite core,
• the signal processing module and the wireless communication module are encapsulated on a rear end of the eddy current testing sensor and are electrically connected to the eddy current testing sensor,
• the miniature centrifugal cooler comprises a coolant storage chamber and a plurality of airflow conduits connected to the coolant storage chamber,
• first ends of the plurality of airflow conduits are respectively connected to the plurality of miniature air film holes corresponding to the plurality of airflow conduits, and
• a junction between the plurality of airflow conduits and the coolant storage chamber is disposed with a centrifugal opening-and-closing valve that is automatically controlled by a centrifugal force.