行星齒輪系損傷的動力學(xué)模型與分析研究
[Abstract]:As a transmission mechanism with many advantages such as high efficiency, small volume and light weight, planetary gear system has been widely used in helicopter gearbox, wind power growth box, construction machinery and other mechanical equipment. However, due to its work in the harsh environment such as wind and sand, humidity, low speed and heavy load, it often leads to fatigue fracture, tooth loss, pitting damage and so on in the important parts such as sun wheel, which results in great losses. Therefore, the research on the dynamic model of planetary gear damage will play an effective guiding role in the fault prediction and diagnosis of planetary gear box. In this paper, the damage dynamics model of planetary gear system is studied and analyzed. Based on the structural characteristics of planetary gear trains, this paper studies the relevant dynamic models at home and abroad. A pure torsional dynamic model considering nonlinear factors such as time-varying meshing stiffness and meshing clearance is established for typical 2K-H planetary gear system by means of lumped mass method. Then, by analyzing the influence of system parameters on the dynamic model, the damage dynamic model of planetary gear train is studied with the change of stiffness as the starting point. Then, this paper uses energy method to calculate the gear meshing stiffness. Combining with the characteristic of gear typical damage, the influence of tooth root crack, tooth failure and pitting damage on the gear pair's time-varying meshing stiffness is analyzed. The time-varying meshing stiffness model of damaged gear pair is obtained. Finally, the dynamic model of the planetary gear system gear damage is obtained, and then solved and simulated by MATLAB software, the characteristic of the typical fault of the simulation signal is analyzed, and the signal characteristics of different damage are obtained.
【學(xué)位授予單位】:華北電力大學(xué)(北京)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TH132.41
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