Device and method for acquiring vibration signal in angular domain of rotating machinery based on micro-sensor

Abstract

The invention provides a rotating machinery angular domain vibration signal acquisition device and a method based on a microsensor, and the method comprises the following steps: S1, an acceleration sensor collects a rotating machinery gear vibration acceleration signal and makes the signal to pass through a linear phase filter to filter; S2, group delay correction is performed on the filtered signal to obtain low frequency rotating speed signal data and high frequency vibration acceleration signal data; and S3, instant angular position reference signal data of the acceleration sensor is obtained through Hilbert transform, resampling is performed on the high frequency vibration acceleration signal data to obtain an angular domain vibration acceleration signal value. The obtained angular domain signal does not influenced by an internal vibration transmission path, is more sensitive to rotator fault and provides a new approach for predicting and diagnosing rotating machinery fault.

Description

technical field [0001] The invention relates to the field of mechanical transmission, in particular to a device and method for acquiring angular domain vibration signals of rotating machinery based on micro sensors. Background technique [0002] Rotating machinery is widely used in electric power, petrochemical, metallurgy, coal, nuclear energy, manufacturing, aviation, military and other industries, and is the key equipment in production. However, due to the influence of many unavoidable factors, rotating components are prone to various failures, causing mechanical equipment accidents, and even causing huge economic losses and casualties, resulting in serious social impacts. During the operation of rotating machinery, the speed often changes, resulting in non-stationary vibration signals, which brings difficulties to the correct identification and prediction of early faults. [0003] The angular domain vibration signal with the angular position of the rotating component as...

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Problems solved by technology

[0006] The aforementioned methods all require the additional installation of tachometers or rotary encoders, and in some occasions the conditions for installing such additional sensors are not available, so the aforementioned angle-domain vibration signal acquisition method is not applicable at this time

At the same time, the traditional angular domain vibration signal acquisition method fixes the acceleration sensor on the machine shell or bearing seat. When the rotating component fails, when the fault vibration signal propagates to the sensor position through a complicated transmission path, the vibration energy has been significantly attenuated, and the fault Features cannot be extracted effectively

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