The invention discloses a variable-period integrated
signal damping ratio diagnosis method, which comprises the steps of firstly using a
data acquisition instrument to acquire vibrating signals, inputting the vibrating signals into a computer for analysis, recognizing the intrinsic frequency of the signals through a non-prior base strategy, then establishing a constructor function through the intrinsic frequency, changing the
time duration of
signal analysis, performing
double integration to the product of the signals and the constructor function, wherein the
time duration of the
double integration is in a twofold relation and is integer multiples of
signal half period, and finally performing simultaneous two-section integration to obtain an equation to be solved, figuring out a signal
attenuation coefficient, obtaining signal
damping ratio through a relationship calculation formula of the
attenuation coefficient, the intrinsic frequency and the
damping ratio, and outputting a diagnosis result. The variable-period integrated signal damping ratio diagnosis method has the advantages that the diagnosis speed is fast, the influence of
negative frequency items on damping diagnosis is eliminated through variable-period integration during calculation, the accuracy of the diagnosis result is high, the diagnosis process is not restricted by the magnitude of the damping value and the
engineering application value is very great.