A method and device for suppressing oil film instability of a sliding bearing based on electromagnetic damping

Abstract

The application discloses a kind of based on electromagnetic damping's sliding bearing oil film instability inhibition method and device, it is related to rotating machinery state monitoring and fault control technical field.The method includes real-time acquisition rotor vibration signal and pre-processing.Spectrum analysis is carried out to the vibration signal after pre-processing, extract the amplitude in preset oil film instability characteristic frequency band, and determine fault characteristic quantity based on the amplitude extracted.Fault characteristic quantity is compared with preset stable threshold, if fault characteristic quantity exceeds preset stable threshold, then determine that sliding bearing occurs oil film instability.When determining that sliding bearing occurs oil film instability, based on the deviation of fault characteristic quantity and preset stable threshold, control instruction including phased adjustment strategy is generated.Based on control instruction, by adjusting the radial gap between permanent magnet assembly and conductor ring assembly in electromagnetic damping module, to dynamically adjust the electromagnetic damping force acting on rotor to inhibit oil film instability, until fault characteristic quantity recovers to below preset stable threshold.

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