Improved method for estimating noise power spectrum of punch press based on Burg method

A noise power spectrum, punching technology, applied in the field of power spectrum estimation, to achieve the effect of improving accuracy and resolution, and low cost

Active Publication Date: 2014-05-21
QIFENG PRECISION IND SCI TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0009] The present invention overcomes the shortcomings of the existing Burg power spectrum estimation method when dealing with repetitive, short-term, high-intensity noise, and proposes an improved method for punch noise power spectrum estimation based on the Burg method

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  • Improved method for estimating noise power spectrum of punch press based on Burg method
  • Improved method for estimating noise power spectrum of punch press based on Burg method
  • Improved method for estimating noise power spectrum of punch press based on Burg method

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Embodiment Construction

[0049] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0050] Such as figure 1 As shown, the power spectrum detection equipment first initializes the equipment parameters, and then waits for the punching control signal to trigger the sensor to collect the noise sample sequence. When the punch retracts the hydraulic hammer control signal, it triggers the sensor to stop collecting the noise sample, thus completing the punching Steps of noise interception and rectangular windowing. The windowing program does not do any processing and just selects the rectangular window, or selects the non-rectangular window according to the characteristics of the noise to further improve the algorithm performance. Here, the power spectrum detection equipment uses an iterative method to calculate the average sequence of effective noise, and does not need to store multiple blanking noises, saving memory space. After ...

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Abstract

The invention provides an improved method for estimating noise power spectrum of a punch press based on the Burg method. The improved method comprises the steps of initializing a power spectrum detection device, taking a punch press punching control signal as a sampling start triggering signal, taking a punch press hydraulic hammer withdrawing control signal as a sampling stop triggering signal, performing windowing processing on a noise sample acquired, calculating a mean value sequence of the effective noise by an iterative method, storing the mean value sequence of the effective noise, repeating the previous steps until an iteration counter i=S, calculating a reflection coefficient Kp, an interference noise noise variance and parameters {ap1, a, ap, 2,..., ap, p} of a p-order AR (Auto Regression) model, and then calculating an estimated value Pxx (omega) of the power spectrum of the punching noise through a formula.

Description

Technical field [0001] The invention relates to a power spectrum estimation method used in the field of noise control, in particular to an improved method for punching noise power spectrum estimation based on the Burg method. Background technique [0002] In the industrial production process, specifically in the working process of the punch press, a punching noise will be generated when the punch hits the material. This kind of noise has the characteristics of repeatability, short-term, and high intensity. This repeated impact noise will cause acoustic fatigue of machinery and equipment, and its long-term effect 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. Therefore, pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216
Inventor 卢昱何熊熊陈河军
Owner QIFENG PRECISION IND SCI TECH
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