The invention provides an early friction
instability fault identification method for a sleeve tooth connection structure. Firstly, a critical rotating speed of a rotor
system with a sleeve tooth connection structure is determined, the critical rotating speed of the rotor
system can be calculated through adopting a
finite element method, and a sleeve tooth friction early-stage
instability fault characteristic
frequency band is determined. In actual operation, a first-order critical rotating speed of the rotor
system can be obtained through adopting an experimental method or a
commercial software calculation method. Vibration signals of the rotor system are collected, the rotating speed is collected, whether the rotating speed is slightly higher than the first-order critical rotating speed or not is further judged, vibration signals in the characteristic
frequency band are collected, the sleeve tooth friction early-stage
instability fault characteristic value is calculated, and whether the sleeve tooth friction early-stage instability fault occurs or not is judged according to the characteristic value. According to the early friction instability fault identification method, heavy loss caused by instability faults can be effectively avoided, the identification process is simple, the
operand is small, the
response time is at the
millisecond level under a mainstream computing platform, the response is rapid, the method can be completely expanded and applied to airborne equipment, and the method has high
engineering application value.