Power frequency interference high-precision compensation method for indexable cutter cutting dynamic signals
A power frequency interference and dynamic signal technology, applied in the direction of measuring devices, instruments, measuring electrical variables, etc., can solve the problem that power frequency harmonic interference is difficult to suppress, and achieve the effect of ensuring the frequency response range
Active Publication Date: 2021-02-05
XIAMEN UNIV +1
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[0004] The purpose of the present invention is to provide a high-precision compensation method for power frequency interference based on digital signal processing of indexable tool cutting dynamic signals for the problem that the power frequency harmonic interference in the dynamic signal acquisition of the indexable tool cutting process is difficult to suppress
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[0053] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.
[0054] The implementation of the present invention comprises the following steps (flow chart as figure 1 shown):
[0055] 1. Use a vibration acceleration sensor to install a vibration acceleration sensor in the non-machining cutting area on the indexable tool spindle, collect and save the discrete digital signal {x(n)} after de-averaging, where n=0,1,...,L- 1. The variable L is the length of the signal and must be even. The required sampling frequency f s and the cutting characteristic frequency f of the indexable tool c Satisfies the relationship between: f s ≥10f c .
[0056] 2. Using the ratio-type spectrum correction method based on the rectangular window function to roughly estimate the frequency parameters of the power frequency interference of the signal {x(n)}, including the following sub-steps:
[0057] a. Perform fast Fourier transfo...
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The invention discloses a power frequency interference high-precision compensation method for indexable cutter cutting dynamic signals, and relates to an analysis and processing method for mechanicaldynamic signals. The power frequency interference high-precision compensation method comprises the following steps of: firstly, carrying out fast Fourier transform on an acquired vibration signal; roughly estimating the frequency of two spectral lines near 50 Hz of a power frequency component by adopting an active frequency shift ratio type spectrum correction method based on a rectangular window;carrying out frequency secondary estimation by using a pair of spectral lines which are symmetrically distributed by taking the rough estimation frequency as a center and have a unit frequency interval; performing approximate full-period sampling truncation on the original data according to the frequency of secondary estimation, and reducing frequency spectrum shape distortion after FFT; performing high-precision and high-density interpolation on the truncated signals, and reducing calculation principle errors of finite summation replacing integration in FFT; and applying an improved active frequency shift ratio type frequency spectrum correction method to high-density sampling signals approximate to a whole period to recognize harmonic parameters of power frequency components, and constructing compensation signals to restrain power frequency interference in original signals.
Description
technical field [0001] The present invention relates to an analysis and processing method of mechanical dynamic signals, in particular to an indexable tool cutting tool that can identify power frequency harmonic component parameters with high precision and construct compensation signals to suppress interference components without changing dynamic signal sampling parameters. A high-precision compensation method for power frequency interference of dynamic signals. Background technique [0002] Indexable tool is a commonly used tool in cutting processing, and vibration acceleration measurement is a commonly used monitoring method at present. Since the acceleration sensor and the surface on which it is installed are all metal conductors, they are susceptible to interference from 50Hz power frequency mains power (hereinafter referred to as power frequency interference) during the measurement process. In engineering, although an insulating pad can be installed between the sensor ...
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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 陈彬强王楚翘何泽姚斌付伟蔡志钦李阳曹新城黄景山
Owner XIAMEN UNIV