Order analysis method based on numerical control machine tool spindle current signals

A technology of spindle current and CNC machine tools, applied in image analysis, testing of mechanical components, testing of machine/structural components, etc., can solve problems such as time domain extraction that cannot obtain orders

Pending Publication Date: 2020-06-09
BEIJING UNIV OF TECH
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Problems solved by technology

At present, the method of equal-angle resampling and FFT is mainly used for order tracking, but this method can only obtain the order spectrum and tracking order spectrum, and cannot obtain the time-domain extraction of the order

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  • Order analysis method based on numerical control machine tool spindle current signals
  • Order analysis method based on numerical control machine tool spindle current signals
  • Order analysis method based on numerical control machine tool spindle current signals

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Embodiment Construction

[0038] The present invention will be further described in detail below with reference to the accompanying drawings. The following examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0039] Specifically, such as figure 1 The method flow chart shown. The present invention provides an order analysis method based on the spindle current signal of a numerically controlled machine tool, including the following steps:

[0040] S1, synchronously collect the continuous time domain signals of the spindle current and spindle vibration of the CNC machine tool;

[0041] S2, performing piecewise Fourier series fitting on the spindle current signal obtained in step S1 to obtain a current smoothed time domain signal;

[0042] S3, searching for the zero-crossing time of the current time-domain signal obtained in step S2, and calculating the speed curve;

[0043] S4, using an improved second-generation Kalman filte...

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Abstract

The invention discloses an order analysis method based on numerical control machine tool spindle current signals. The method comprises the steps of calculating collected numerical control machine toolspindle current signals to obtain spindle rotating speed; performing improved second-generation Kalman filtering order tracking on the vibration signals synchronously acquired with the current signals and the calculated rotating speed signals to extract each order component; and finally, drawing an order-time-amplitude three-dimensional order spectrogram and an order-rotating speed-amplitude three-dimensional order spectrogram. Aiming at the existing tachometer rotating speed calculation method and occasions and equipment which are inconvenient to install, the invention provides a three-dimensional order spectrogram which can calculate the rotating speed through numerical control machine tool main shaft current signals and then make a three-dimensional order spectrogram. The method does not need to obtain rotating speed pulse signals, and the calculation result is superior to that of an instantaneous frequency estimation method for obtaining the rotating speed; and the change conditions of the fault feature order and the feature order amplitude along with the time and the rotating speed can be visually seen in the three-dimensional order spectrogram.

Description

Technical field [0001] The invention belongs to the field of abnormal state monitoring and fault diagnosis, and particularly relates to an order analysis method based on the spindle current signal of a numerical control machine tool. Background technique [0002] Order analysis technology is an important technology for vibration signal analysis and fault diagnosis of rotating machinery. Currently, equal-angle resampling and FFT methods are mainly used for order tracking, but this method can only get the order spectrogram and the tracking order spectrogram, and cannot obtain the time domain extraction of the order. The speed calculation method is the premise for order tracking extraction. The speed calculation method includes the speed calculation with a tachometer and the speed calculation without a tachometer. For the measurement of the speed pulse signal, one is contact measurement. The most common contact measurement is the use of photoelectric pulse encoders for measurement ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T7/277G06F17/14G06F17/13G01M13/028
CPCG06T7/277G06F17/14G06F17/13G01M13/028G06F2218/18
Inventor 王民王聪秦鹏孙铁伟
Owner BEIJING UNIV OF TECH
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