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Vibration response characteristics of planetary gear rotor coupling system under composite fault state

Published:2023-11-01 author:ZHOU Bohu, LI Guoyan, REN Yulin, et al. Browse: 416 Check PDF documents

Vibration response characteristics of planetary gear rotor coupling system

under composite fault state

ZHOU Bohu1, LI Guoyan1,2,3, REN Yulin1, XIONG Xiaoyan1,2

(1.School of Mechanical and Transportation Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2.Key Laboratory

of New Sensors and Intelligent Control of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China; 3.School of

Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China)

Abstract: At present, domestic and foreign scholars have conducted research on the dynamic characteristics of gear rotor coupling systems, but none of the above studies have considered the composite fault state of planetary gears and rotors. Therefore, taking a single stage planetary gearbox as an example, a dynamic model of the planetary gear rotor coupling system with rotor eccentricity and root crack faults was constructed, to simulation analyze and experimentally study the vibration response characteristics of the planetary gear rotor coupling system under composite fault conditions. Aiming at the problem of multi-source coupling vibration and composite fault diagnosis in planetary gear transmission systems, a single stage planetary gearbox was executed by dynamic modeling, dynamic characteristics analysis and experimental analysis.Firstly, considering time-varying meshing stiffness, support stiffness, damping, gyroscopic effect, and transmission shaft flexibility, the lumped parameter method and Timoshenko beam theory was used to establish a dynamic model of a planetary gear-rotor coupling system with shaft eccentricity root crack composite fault.Then, the influence of different faults on the dynamic characteristics of the system was analyzed by numerical analysis using time waves, frequency spectrum, axis center orbit and phase diagram.The influence of the root crack propagation of the sun gear on the vibration response characteristics of the system under eccentric state was studied. Finally, the accuracy of the dynamic model was verified by different crack fault experiment. The results show that the influence of eccentricity on meshing vibration is significant and can not be ignored in the analysis of fault characteristics of planetary gear trains. Under the influence of eccentric-crack coupling, the vibration response of the system is composed of unbalanced vibration, normal meshing vibration and fault impact vibration. In the spectrum, there are rotational frequency fr, meshing harmonic kfm and complex sideband component kfm±fr、kfm±fr±nfsc. With the increase of crack degree, the modulation phenomenon is more obvious.The research results can provide a theoretical basis for the compound fault diagnosis of planetary gear-rotor system.

Key words: gear transmission; dynamic model of planetary gear rotor coupling system; multi source coupled vibration; tooth root crack propagation; eccentricity of rotating shaft; composite fault vibration characteristics

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