Vibration signal time domain synchronous averaging method for variable speed gearbox

Abstract

The invention discloses a vibration signal time domain synchronous averaging method for a variable speed gearbox. The vibration signal time domain synchronous averaging method comprises the following steps: 1) collecting to get original vibration signals of the variable speed gearbox according to a conventional equal-time-interval way; 2) getting signal frequency signals which are related to the variable speed through short-time Fourier transform and time-frequency filtering methods; 3) getting an unwrapped phase versus time curve of the signal-frequency signals by Hilbert transform; 4) performing equal-angle resampling on the original vibration signals to complete the transformation from the variable-speed vibration signals to constant-speed vibration signals; and 5) getting average signals by getting help from the traditional time domain averaging method. According to the vibration signal time domain synchronous averaging method disclosed by the invention, time-scale-free time domain averaging of the vibration signals of a variable speed gear is realized, the signal-to-noise ratio of the original signals is effectively improved, and a basis is provided for state monitoring and fault diagnosis of the gear. Simultaneously, the equal-angle resampled vibration signals obtained by the method can create conditions for follow-up spectrum analysis and the like.

Description

technical field [0001] The invention belongs to the technical field of mechanical state monitoring and fault diagnosis, and relates to a vibration signal time-domain synchronous averaging method, in particular to a vibration signal time-domain synchronous averaging method for a variable speed gearbox. Background technique [0002] As an indispensable speed change and transmission part in mechanical equipment, gearbox transmission can realize functions such as acceleration and deceleration, change of transmission direction, change of rotational torque, clutch and distribution of power, and is currently widely used in metal cutting machine tools, aviation industry, military Industrial, agricultural machinery, transportation machinery and other key equipment. The safe operation of gearbox equipment is related to the safety of the entire unit and production. In order to improve the reliability of equipment operation and prevent accidents, it is necessary to carry out condition ...

AI Technical Summary

Problems solved by technology

However, in the case of variable speed, the number of data points in one rotation cycle of the signal collected by the conventional equal time interval method is different, which violates the principle of consistent sampling points in each cycle of the time domain average, so that the time domain average in the variable speed difficult to achieve under the conditions

In addition, conventional time-domain averaging is based on time-scale signal analysis, but in reality, many gearboxes cannot be installed with time-scale signal sensors due to the machine itself or the on-site environment, which also limits the application of time-domain averaging

Images