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Real-time detection algorithm of maximum power frequency component of vibration signal that can suppress DC disturbance

A technology of maximum power and frequency components, which is applied in the field of real-time detection algorithms for the maximum power and frequency components of vibration signals, which can solve the problems of incorrect frequency, amplitude and signal estimation results, and achieve the effect of strong real-time performance.

Inactive Publication Date: 2019-05-31
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the DC component is not handled properly, it will lead to incorrect frequency, amplitude, and signal estimation results

Method used

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  • Real-time detection algorithm of maximum power frequency component of vibration signal that can suppress DC disturbance
  • Real-time detection algorithm of maximum power frequency component of vibration signal that can suppress DC disturbance
  • Real-time detection algorithm of maximum power frequency component of vibration signal that can suppress DC disturbance

Examples

Experimental program
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Effect test

example 1

[0058] Example 1: Tracking a pure sine wave with a frequency of 150Hz, assuming the input signal is ,Sampling frequency , , the initial value of angular frequency estimation rad / s, passband bandwidth Hz, adaptation factor . can be calculated , the discretized form of the iterative execution steps of the inventive algorithm is:

[0059]

[0060] .

[0061] figure 2 For the original sine wave curve with DC bias, the sine wave is scaled, the amplitude of the sine wave is 1PU, and the DC bias is 3PU. image 3 for gain The frequency tracking curves at 1 and 5 respectively, it can be seen that the algorithm suppresses the DC interference very well. At the same time, increase Can speed up the frequency tracking speed, when When , frequency tracking can enter a steady state within 0.8s, and the maximum relative error of frequency estimation is 0.25%.

example 2

[0062] Example 2: The experimental device adopts a single-stage involute cylindrical gear reducer, the reduction ratio is 2.24, the gear modulus used in the reduction box is 1.5, the number of teeth is 91, 41 respectively, and the rolling bearing model of the fault bearing seat is 6313ZZ (including 8 artificial worn balls). The speed of the three-phase asynchronous motor is set to 1200rpm by the frequency converter, and the AC192 vibration sensor is used to pick up the radial mechanical vibration signal of the bearing seat. The AC192 output signal is adjusted by the conditioning circuit to adjust the level range, and then ADS1205 realizes Δ-Σ oversampling, and AMC1210 realizes sinc For filtering, TMS320LF2808 reads the register of AMC1210 at a sampling frequency of 10KHz to obtain the vibration signal. Set the initial value of angular frequency estimation rad / s, passband bandwidth Hz, adaptation factor . The discretization form of the iterative execution steps of the in...

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Abstract

The invention discloses a real-time detection algorithm for maximum power frequency component of vibration signals capable of restraining direct-current disturbance. The real-time detection algorithm includes: firstly, giving out an automatic computation formula of fourth-order system state equation, adaptive adjusting law and fourth-order system damping ratio for iterative processing the vibration signals to acquire the maximum power frequency component; secondly, multiplying the vibration signals by a gain coefficient, iteratively executing the automatic computation formula of the fourth-order system state equation, the adaptive adjusting law and the damping ratio, and dynamically tracking angular frequency of the vibration signals; finally, after frequency tracking is stabled, calculating frequency, amplitude and phase of the vibration signals according to angular frequency converges and state variables. The real-time detection algorithm is high in timeliness, the affect of the direct-current disturbance on a detection result can be avoided, and the maximum power frequency component signal in the vibration signals is effectively extracted.

Description

technical field [0001] The invention relates to the technical fields of vibration control and vibration testing, in particular to a real-time detection algorithm for maximum power frequency components of vibration signals that can suppress DC disturbances. Background technique [0002] With the development of computer technology and control theory, the feedback compensation control method that uses the controller to generate reverse force to suppress mechanical vibration has been widely valued in the fields of precision instruments, machining and chemical process machinery. Among them, the frequency, amplitude, and phase detection accuracy of the frequency component corresponding to the maximum power of the vibration signal and the real-time performance of the detection algorithm are key factors that restrict the bandwidth and stability of the control system. The applicant once disclosed a real-time calculation method of vibration signal amplitude and phase in patent applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H1/14G01H11/06
CPCG01H1/14G01H11/06
Inventor 廖晓文
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH