Method for rotation speed extraction through peeling off fault corresponding impact by employing rolling ball track

Abstract

The present invention relates to a method for rotation speed extraction through peeling off fault corresponding impact by employing a rolling ball track, belonging to the field of the fault diagnosis technology and the signal processing analysis technology. A charge amplifier is employed to perform amplification process of the original vibration signals, collected by an accelerometer, of a fault rolling bearing; the original vibration signals after the amplification process are subjected to the AR pre-whitening processing, an MED filtering method with the combination of a spectrum kurtosis is employed to enhance the fault impact feature in the pre-whitening signals, and the obvious vibration signals of the fault impact feature are obtained; the obvious vibration signals of the fault impact feature are subjected to Hillbert transformation, and enveloping signals are constructed; the impact feature position information in the enveloping signals of larger than a threshold is extracted; the rotation speed of a maintenance support is calculated; and the rotation speed of a rotating shaft is calculated according to the rotation speed of the maintenance support. The method provided by the invention is much simpler and better effective than other rotation speed extraction methods, can avoid the inhibition of the work condition for the installation of a collection device, and can save the rotation speed extraction cost.

Description

technical field [0001] The invention relates to a method for extracting a rotating speed through the impact characteristics corresponding to the spalling fault of a rolling bearing raceway, and belongs to the technical field of fault diagnosis technology and signal processing and analysis. Background technique [0002] Affected by factors such as voltage fluctuations and load changes, rotating machinery in operation will have speed changes. Accurate and effective speed measurement is beneficial to the status monitoring of rotating machinery and subsequent fault diagnosis and analysis. [0003] Order ratio analysis is an important means to deal with the unsteady signal of rotating machinery. Order ratio sampling is an important link in order ratio analysis, and it is necessary to track and filter the vibration signals of rotating machinery during the speed up and down stages. At present, the commonly used tracking filtering methods include hardware-based filtering methods an...

AI Technical Summary

Problems solved by technology

The former not only needs a special tachometer to complete the speed monitoring, but also needs a corresponding data acquisition device. However, under actual working conditions, it is difficult to install a tachometer on many devices and cannot directly obtain the speed signal. The application of this method has caused great problems. Inconvenient; the latter overcomes the disadvantage of inconvenient hardware installation, and uses the instantaneous frequency of the time-frequency distribution to obtain the rotational speed information of the required shaft. In this case, the analysis accuracy is limited, and the analysis process is complex and susceptible to interference

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