Instantaneous frequency estimation method based on LoG operator and PauTa test
An instantaneous frequency and operator technology, applied in the field of rotating machinery condition monitoring and fault diagnosis, can solve the problems of one-step cost function delay, low accuracy and precision, and cannot change with time, so as to eliminate time delay and avoid The effect of relying on and eliminating errors
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[0059] example, as figure 1 As shown, the instantaneous frequency estimation method based on LoG operator and PauTa test includes the following steps:
[0060] Step 1: Use the short-time Fourier transform algorithm to convert the signal x(k) (k=1, 2, …, N) into a time-spectrogram, where N represents the length of the signal;
[0061] Step 2: Select a local area with a high signal-to-noise ratio from the time-spectrogram, and use the LoG detection algorithm to convert the local area into a binary image. The binary image contains multiple ridges; a local area refers to at least two Ridges, areas where the signal-to-noise ratio is greater than 80dB;
[0062] Step 3: Use the PauTa test algorithm to exclude outliers on the upper and lower edges of each ridge;
[0063] Step 4: The above-mentioned multiple ridges are superimposed on one of the ridges with the most complete outline according to the kinematic proportional relationship between them, and a synthetic ridge with a comple...
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