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Acceleration noise filtering and integration method combined with spectrum energy shape fitting

A technology of spectrum energy and integration method, which is applied in the field of acceleration noise filtering and integration combined with spectrum energy shape fitting, can solve the problem that the cutoff frequency is very sensitive, and achieve the effect of strong anti-noise performance

Active Publication Date: 2018-11-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the frequency cut-off method is easy to implement, and the integral effect is superior, but there is a problem that it is very sensitive to the setting of the cut-off frequency

Method used

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  • Acceleration noise filtering and integration method combined with spectrum energy shape fitting
  • Acceleration noise filtering and integration method combined with spectrum energy shape fitting
  • Acceleration noise filtering and integration method combined with spectrum energy shape fitting

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Embodiment 1

[0064] A frequency-domain noise filtering and integration method combined with spectral energy shape fitting, defined as an effective frequency band method, is used for integral filtering of acceleration signals. This method assumes that the spectrum curves in the vicinity of each peak main frequency conform to the Gaussian function distribution, and according to the cumulative energy change of the noisy signal in this area, the correlation function parameters are obtained by fitting, so as to determine the distribution range of the main frequency effective information according to the principle of three times the radius , and then through the frequency domain integration and inverse Fourier transform in each effective frequency band, the corresponding velocity and displacement signals are reconstructed. The results show that compared with the traditional frequency domain integration method, the effective frequency band method can realize the automatic determination of the inte...

Embodiment 2

[0104] see process figure 1 , in this embodiment, the acceleration noise filtering and integration method combined with spectrum energy shape fitting includes the following steps:

[0105] (1) Signal preprocessing: subtract its mean value from the collected acceleration signal, and then perform Fourier transform to obtain its amplitude spectrum;

[0106] (2) Segmented spectrum curve shape assumption: m peak main frequencies can be obtained by observing the amplitude spectrum, assuming that each main frequency and its surrounding areas conform to the Gaussian function assumption, and divide each main frequency into its own area, and the frequency bands are normalized change;

[0107] (3) Segmented cumulative signal energy calculation: accumulate the energy in each main frequency area, and normalize the energy;

[0108] (4) Parameter fitting and determination of effective frequency band: use the formula containing the Gaussian error function to fit the energy curve, so as to o...

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Abstract

The invention discloses an acceleration noise filtering and integration method combined with spectrum energy shape fitting. The spectral curve in the close region of the peak dominant frequency is assumed to conform to the Gaussian function distribution. According to the cumulative energy variation of the noisy signal in the region, the parameters of the correlation Gaussian function are fitted, and the distribution range of the effective information of the dominant frequency is determined according to the principle of triple radius, and then the corresponding velocity and displacement signalare obtained through the frequency domain integration and inverse Fourier transform in the effective frequency band. Compared with the traditional frequency domain integration method, the method of the invention can realize automatic determination of the integration frequency band, can obtain higher integration precision under harmonic excitation and stable and good integration precision under random excitation, and has stronger anti-noise performance.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an acceleration noise filtering and integration method combined with spectrum energy shape fitting. Background technique [0002] The existing integral noise filtering methods can be divided into two categories: time-domain methods and frequency-domain methods. The most representative method in the time domain is the method of polynomial fitting to remove the trend term. This method is used to correct the acceleration integral response containing the DC component, and the integral noise filtering effect is obvious. But when the acceleration is affected by complex noise, the response effect obtained by using this method to integrate is not ideal. Therefore, in view of the complex interference environment in the vibration test practice, the frequency domain integral noise filtering method is mostly used in engineering practice. Typical methods include digital filtering m...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06F2218/10G06F2218/04
Inventor 陈太聪张奇
Owner SOUTH CHINA UNIV OF TECH
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