Amplitude spectrum array waterfall plot for shaft vibration analysis of starting-stopping process
A technology of waterfall diagram and amplitude, which is applied in the direction of measuring vibration, vibration measurement in solids, and testing of machine/structural components, etc. It can solve the problems of inconvenient relationship between waterfall diagram and machine state, failure to reflect, and display differences.
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[0035] Simultaneously measure the x and y vibration displacement signal sequences of the rotating shaft at different speeds during the start-up process of a unit. The arrangement of the X and Y sensors is as follows: image 3 shown. The x-signal and y-signal sequences collected synchronously have a sampling rate of 2kHz and the number of sampling points is N=1024. The specific implementation is as follows:
[0036] (1) Read the sequence pair of x signal and y signal at each speed during the starting process, the sampling rate is 2kHz, and the number of sampling points is N=1024.
[0037] (2) Perform fast discrete Fourier transform (FFT) on a pair of x-signal and y-signal sequences at each rotational speed, and the result is a 1024-point complex sequence.
[0038] (3) Based on the fast Fourier transform results of the two signals of x and y, obtain their respective Fourier series, and obtain parameters of a total of N / 2=512 harmonic components from small to large.
[0039] (...
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