Recognition Method and Device for Magnetic Suspension Bearing Shaft Falling Trajectory Response Based on Hilbert Transform

Abstract

The invention discloses a magnetic suspension bearing shaft system falling track response recognition method and device based on Hilbert transform, wherein the method comprises the following steps of obtaining a continuous time domain displacement signal of a shaft system; setting the sampling frequency of the continuous time domain displacement signal, and obtaining a discrete time domain displacement signal; obtaining an instantaneous frequency spectrum signal through Hilbert transform; setting cutting-off time duration and a threshold value; solving the variance and expectation of the instantaneous frequency in the cutting-off time; comparing the variance and expectation of the instantaneous frequency with the threshold value; determining the track response of the shaft system. The method has the advantages that only the displacement signal of the shaft system is used; the obtaining is easy; the instantaneous calculation of frequency change can be realized; the real-time performance is good; simplicity, convenience and high speed are realized.

Description

technical field [0001] The invention relates to a post-processing technology of a magnetic suspension shafting displacement signal, in particular to a method and a device for quantitatively dividing the trajectory response of a high-speed shafting of a magnetic suspension bearing after a drop based on the Hilbert transformation of the shafting displacement signal. Background technique [0002] The application of magnetic bearings in the field of rotating machinery is increasing year by year. Magnetic suspension bearings can provide non-contact support, especially suitable for use in high-speed, low-loss, and low-noise situations, and the stiffness and damping of magnetic suspension bearings can be adjusted. Bearing protection is one of the key components of magnetic suspension bearings. One of its main functions is to temporarily support the high-speed rotating shafting when the magnetic bearing fails, and make it resuspend or decelerate safely. At present, rolling bearing...

AI Technical Summary

Problems solved by technology

However, in most equipment, the rubbing force between the shafting and the inner ring of the protective bearing is difficult to measure accurately, and a force sensor must be installed to improve the measurement accuracy

Installing force transducers will also result in more complex support structures to protect the bearings

Therefore, the accurate measurement of friction force will inevitably lead to more complex equipment structure and increase the cost of equipment

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