A method for detecting abnormal knocking noise of gear box off-line

Abstract

The invention discloses an off-line detection method for a knock abnormal sound of a gearbox. Firstly, based on a statistics method, a random impact interference component in a vibration signal is removed; then, based on a TSA method, a periodic impact component representing the knock abnormal sound of the gearbox is extracted; finally, a kurtosis index of the signal is calculated and extracted tobe compared with a set abnormal sound threshold value, in this way, whether or not the knock abnormal sound of the gearbox exists is judged, and an abnormal sound source is locked on a rotary shaft.The off-line detection method can be applied to the off-line detection stage of the gearbox, in a random impact interference environment, the knock abnormal sound of the gearbox is automatically detected, wrong judgment and judgment missing in human ear detection are avoided, the knock abnormal sound of the gearbox is automatically detected, and the off-line detection method has the advantages ofrealizing uniform evaluation standards, being high in efficiency and low in cost, and easily tracing to the source of the problem.

Description

technical field [0001] The present invention relates to a gearbox NVH (English abbreviation for Noise, Vibration and Harshness) detection method, in particular to a gearbox knocking abnormal sound off-line detection method. Background technique [0002] In modern industry, as an important general-purpose component for connecting and transmitting power in mechanical equipment, gearboxes are widely used because of their advantages such as fixed transmission ratio, large transmission torque, compact and reliable structure, etc. With the development of society, NVH issues are getting more and more attention from various industries. As one of the difficult problems in NVH control, the off-line detection of abnormal noise of gearboxes has increasingly become the focus of attention of the manufacturing industry. [0003] During the production, handling, and installation of axle gear parts, due to improper operation by production personnel, the gears collide with other equipment, w...

AI Technical Summary

Problems solved by technology

As a common interference noise in industrial noise, random impact interference has the characteristics of large instantaneous energy, wide frequency bandwidth, and uncertain location. If it is not separated from the fault signal, it will directly lead to misjudgment of abnormal noise

[0005] At present, the manufacturer mainly carries out the inspection work manually. Although the human hearing method can meet the inspection requirements to a certain extent, there are still many deficiencies: 1. The evaluation standards are not uniform; 2. Inefficiency, High cost; 3. It is difficult to trace the source of the problem

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