Dynamic Analysis and Experimental Research of Planetary Gear System with Crack Fault

doi:10.3901/JME.2600745

Abstract

Abstract: Tooth root crack will cause meshing stiffness to attenuate and thereby impact the vibration characteristics of the system due to the meshing position deviation caused by the elastoplastic deflection of the cracked tooth and the gear radial runout. By taking into account the deviation of the meshing position caused by radial runout and the elastoplastic bending, the actual meshing position was derived, and its meshing stiffness was studied by applying the potential energy method. A dynamic model of a planetary gear system coupled with multiple excitation factors was established by considering factors such as manufacturing error, clearance, time-varying meshing stiffness, and damping. The dynamic characteristic laws under different fault states were analyzed, and the model was verified through experimental research. Results show mesh stiffness is highly sensitive to plastic bending deformation, with greater stiffness attenuation in double-tooth meshing zones versus single-tooth zones. The coupling clearance induces periodic time-variation in gear pair pressure angle, modulated by carrier rotational frequency. Additionally, meshing frequency exhibits sidebands modulated by the rotation frequency of the carrier, sun gear, and fault characteristic frequencies. This precise modeling of planetary gear dynamics and modulation mechanisms provides critical theoretical support for fault diagnosis in geared transmission systems.

Key words: tooth root crack, mesh stiffness, potential energy method, planetary gear system, dynamic response

CLC Number:

TH132

LIU Yinghui, LI Shanying, FENG Guojin, ZHANG Hao, ZHEN Dong. Dynamic Analysis and Experimental Research of Planetary Gear System with Crack Fault[J]. Journal of Mechanical Engineering, 2026, 62(14): 84-96.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.2600745

http://www.cjmenet.com.cn/EN/Y2026/V62/I14/84

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