Nonlinear dynamic modeling of a helicopter planetary gear train for carrier plate crack fault diagnosis

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• 作者：Lei Fan^a ; ^b ; ^{leifan@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Shaoping Wang^a ; ^{shaopingwang@vip.sina.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Xingjian Wang^a ; Feng Han^b ; Huawei Lyu^b
• 关键词：Angular shift ; Carrier plate crack ; Crack fault diagnosis ; Helicopter planetary gear train ; Nonlinear dynamics modeling
• 刊名：Chinese Journal of Aeronautics
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：29
• 期：3
• 页码：675-687
• 全文大小：3360 K

文摘

Planetary gear train plays a significant role in a helicopter operation and its health is of great importance for the flight safety of the helicopter. This paper investigates the effects of a planet carrier plate crack on the dynamic characteristics of a planetary gear train, and thus finds an effective method to diagnose crack fault. A dynamic model is developed to analyze the torsional vibration of a planetary gear train with a cracked planet carrier plate. The model takes into consideration nonlinear factors such as the time-varying meshing stiffness, gear backlash and viscous damping. Investigation of the deformation of the cracked carrier plate under static stress is performed in order to simulate the dynamic effects of the planet carrier crack on the angular displacement of carrier posts. Validation shows good accuracy of the developed dynamic model in predicting dynamic characteristics of a planetary gear train. Fault features extracted from predictions of the model reveal the correspondence between vibration characteristic and the conditions (length and position) of a planet carrier crack clearly.