Planetary gearbox sun gear gradient pitting corrosion time-varying meshing stiffness analysis method

Abstract

The present invention discloses a planetary gearbox sun gear gradient pitting corrosion time-varying meshing stiffness analysis method and belongs to the dynamic modeling and signal analysis field. According to the planetary gearbox sun gear gradient pitting corrosion time-varying meshing stiffness analysis method, with an easily-damaged sun gear in a planetary gearbox adopted as an object, the pitting corrosion of the sun gear is divided into an early pitting stage and an extended pitting stage according to gradient pitting corrosion on the teeth of the sun gear; a calculation method of the time-varying meshing stiffness of the sun gear during a pitting fault is inferred on the basis of a potential energy law and according to the stress and deformation of the gear caused by pitting of different levels; and on the basis of the calculation method, the dynamic characteristic and vibration response of gradient pitting corrosion can be precisely analyzed. The method of the present invention can be applied to the dynamics research of other gearboxes of which the structures are similar to that of the sun gear.

Description

technical field [0001] The invention belongs to the field of dynamic modeling and signal analysis, in particular to a method for analyzing the meshing stiffness with gradual pitting and time-varying meshing stiffness of the sun gear of a planetary gearbox. Background technique [0002] Planetary gearboxes have been widely used in mechanical transmission systems in industries such as aerospace, ships, wind power, and manufacturing because of their small size, large load-carrying capacity, and stable operation. Due to factors such as harsh working environment and high load, the key components such as the sun gear and planetary gear are easily damaged, thus affecting the safety and reliability of the entire system. During the transmission process, the time-varying meshing stiffness is one of the main excitation sources for the vibration response of the gear transmission system. Especially when the gear is faulty, the meshing stiffness decreases, causing greater noise and vibrat...

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Problems solved by technology

However, most studies on pitting corrosion focus on the analysis of pitting vibration signals, and there are still few studies on the vibration mechanism of gear tooth pitting corrosion faults; The situation is quite different from the gradual change characteristics of pitting corrosion

The development of pitting is a gradual process. The early pitting is slight and difficult to distinguish: under the action of continuous fatigue, the tiny pitting gradually expands, resulting in increased denudation of the tooth surface and aggravated the impact

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