Based on the characteristics that energy fluctuation occurs during resonant vibration transfer in elastic medium

a kind of method was developed to identify the state of rubbing between rotor and engine-frame by using the evidence of energy distribution and its movement.The rubbing was identified by processing vibration signals using fast Fourier transform(FFT)

understanding color maps by point of energy

and also combining time-domain charts

frequency charts and waterfall maps.Through experiments

it's proved that the method is applicable and also provides actual evidence in engineering application.