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

Active Publication Date: 2014-05-21
陈德言
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Problems solved by technology

[0009] The present invention overcomes the shortcomings of the existing periodogram power spectrum estimation method when dealing with repet...

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  • Periodogram method based punch press noise power spectrum estimation improvement method
  • Periodogram method based punch press noise power spectrum estimation improvement method
  • Periodogram method based punch press noise power spectrum estimation improvement method

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Embodiment Construction

[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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Abstract

A periodogram method based punch press noise power spectrum estimation improvement method includes initializing a power spectrum detection device, and setting a sensor sampling frequency, a discrete Fourier transform parameter, a window function shape, window function length, an iteration counter i initial value, a total iteration time S, and an initial value of an average discrete Fourier transform approximate value; using a punch press blanking control signal as a starting sampling trigger signal; using a punch press retrieve hydraulic hammer control signal as a finishing sampling trigger signal; waiting for the trigger signal, wherein a trigger sensor finishes collecting a blanking noises x(t) sample; windowing the collected noise sample; using an iterative method to calculate a discrete Fourier transform average value of an L point, and storing the result of the discrete Fourier transform average value; repeating the steps until the iteration counter i=S; dividing a square of the discrete Fourier transform average value by data length to obtain a power spectrum estimation value.

Description

technical field [0001] The invention relates to a method for estimating power spectrum used in the field of noise control, in particular to an improved method for estimating power spectrum of punch noise based on periodogram method. Background technique [0002] In the industrial production process, specifically during the working process of the punch press, a punching noise will be generated when the punch hits the material. This noise has the following characteristics: repetitive, short-term, and high-intensity. This repeated impact noise will lead to acoustic fatigue of machinery and equipment, and long-term effects will shorten its service life and even cause production accidents. Strong noise can easily form beat-type infrasound waves, which affect the human body. There are natural frequencies in all parts of the human body, the body is 7-13HZ, the internal organs are 4-6HZ, and the head is 8-12HZ. These natural frequencies are just in the infrasonic frequency band, s...

Claims

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Application Information

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IPC IPC(8): G10L21/0216
Inventor 卢昱何熊熊陈河军
Owner 陈德言
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