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Method for re-sampling vibration signals of rotary machine in angular domains on basis of instantaneous frequency estimation

A technology of instantaneous frequency and vibration signal, applied in the direction of using electrical devices, measuring devices, instruments, etc., can solve the problems of harsh installation environment and increase hardware cost, and achieve the effect of low hardware cost, low hardware cost and high analysis accuracy.

Inactive Publication Date: 2013-09-18
佛山市彩博电器科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has high real-time performance, but undoubtedly needs to increase the cost of hardware, and also puts forward strict requirements on the installation environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Acquisition of vibration signals from rotating machinery. In this embodiment, a test bench for an elastically coupled three-pivot rotor system is established, and the connection between an eddy current vibration sensor and a digital signal collector is established, and the vibration displacement in the horizontal direction is collected at an equal time interval sampling frequency of 1600 Hz , the number of sampling points is 8192, during this period the rotation speed increases from 600 rpm to 2050 rpm, and the system input signal X(t) is obtained.

[0020] 2. Time-domain downsampling. The time-domain vibration signal X(t) is further subjected to time-domain down-sampling processing by using software to extract data points, and the down-sampling rate is 1 / 2 to obtain a time-domain down-sampling signal S(t).

[0021] 3. Compute the instantaneous frequency components of the downsampled signal S(t) in the time domain. Add a Gaussian white noise sequence N(t) with a s...

Embodiment 2

[0027] 1. Acquisition of vibration signals from rotating machinery. In this embodiment, a test bench for an elastically coupled three-pivot rotor system is established, and a connection between an eddy current vibration sensor and a digital signal collector is established to collect vibration displacement in the vertical direction at an equal time interval sampling frequency of 1600 Hz , the number of sampling points is 8192, during this period the rotational speed increases from 1520 rpm to 3250 rpm, and the system input signal X(t) is obtained. 2. Time-domain downsampling. The time-domain vibration signal X(t) is further subjected to time-domain down-sampling processing by using software to extract data points, and the down-sampling rate is 1 / 2 to obtain a time-domain down-sampling signal S(t).

[0028] 3. Compute the instantaneous frequency components of the downsampled signal S(t) in the time domain. Add a Gaussian white noise sequence N(t) with a similar scale distribu...

Embodiment 3

[0034] 1. Acquisition of vibration signals from rotating machinery. In this embodiment, a test bench for an elastically coupled three-pivot rotor system is established, and the connection between an eddy current vibration sensor and a digital signal collector is established, and the vibration displacement in the vertical direction is collected at an equal time interval sampling frequency of 1800 Hz , the number of sampling points is 8192, during this period the rotational speed increases from 2050 rpm to 3400 rpm, and the system input signal X(t) is obtained.

[0035] 2. Time-domain downsampling. A low-pass filter is used to further perform time-domain down-sampling processing on the time-domain vibration signal X(t), and the down-sampling rate is 1 / 4 to obtain a time-domain down-sampling signal S(t).

[0036] 3. Compute the instantaneous frequency components of the downsampled signal S(t) in the time domain. Add a Gaussian white noise sequence N(t) with a similar scale dis...

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Abstract

The invention discloses a method for re-sampling vibration signals of a rotary machine in angular domains on the basis of instantaneous frequency estimation, and relates to a method for diagnosing and managing mechanical faults. The method includes acquiring the vibration signals of the rotary machine, performing down-sampling on the vibration signals in time domains, computing instantaneous frequencies of the vibration signals, dividing instantaneous frequency sequences, fitting an instantaneous frequency curve, computing sampling moment sequences of the signals in the angular domains and computing amplitude sequences corresponding to sampling moments of the signals in the angular domains; computing the amplitude sequences corresponding to the sampling moments of the signals in the angular domains by a Lagrange interpolation algorithm, solving corresponding amplitude sequences A(t) corresponding to original signals at re-sampling moments and finally acquiring re-sampled signals R(t) of the vibration signals in the angular domains. The method has the advantages that an extra tachometer for extracting rotation speed information is omitted, the rotation information of a rotary shaft can be directly acquired from the vibration signals, the analytical precision is high, the cost of hardware is low, and the method is unlimited by environments and specifically has a significance in technological transformation for existing equipment of enterprises.

Description

technical field [0001] The invention relates to a method for diagnosing and managing mechanical faults, in particular to a resampling method for angular domain resampling of vibration signals of rotating machinery based on instantaneous frequency estimation. Background technique [0002] In recent years, the order tracking analysis technology of vibration signals has become more and more mature. The structure of the rotating machinery is complex and requires high operating conditions, and it has been in a high-speed operation state (generally above 3,000 revolutions per minute, or even as high as 10,000 revolutions per minute) for a long time. Especially with the development of various technologies, the requirements for the speed of rotating machinery are increasing Correspondingly, its fault prediction and health management also face more severe challenges. Vibration signals during the speed-up, deceleration and speed-changing process of rotating machinery contain rich sta...

Claims

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Application Information

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IPC IPC(8): G01H11/02
Inventor 齐晓轩原忠虎韩晓微
Owner 佛山市彩博电器科技有限公司
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