Periodogram method based punch press noise power spectrum estimation improvement method
A technique of periodogram and punch press, applied in the field of power spectrum estimation, to achieve the effect of suppressing the interference of white noise, improving accuracy, and being easy to implement
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[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0036] Such as figure 1 As shown, the power spectrum detection equipment first initializes the equipment parameters, and then waits for the punch control signal to trigger the sensor to collect the noise sample sequence. When the punch press retracts the hydraulic hammer control signal, the trigger sensor stops collecting noise samples, thus completing the blanking. The steps of noise interception and adding rectangular window. The windowing program just selects a rectangular window without any processing, and can also select a non-rectangular window according to the characteristics of the noise to further improve the performance of the algorithm. Here, the power spectrum detection device uses an iterative method to calculate the average value of the discrete Fourier transform, which does not need to store multiple punching n...
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