电磁轴承失效后航空发动机转子跌落动力学分析  

Dynamic analysis of the aero-engine rotor drop after the failure of active magnetic bearings

作　　者：王小虎 杨芳芳 赵强 WANG Xiao-hu;YANG Fang-fang;ZHAO Qiang(AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China)

机构地区：[1]中国航发四川燃气涡轮研究院

出　　处：《燃气涡轮试验与研究》2019年第4期1-7,15,共8页Gas Turbine Experiment and Research

摘　　要：为研究航空发动机用主动电磁轴承失效后,发动机转子跌落在辅助轴承上对轴承、轴承座乃至整个发动机造成的冲击,建立了转子跌落及碰撞的力学模型。以模拟转子为研究对象,通过有限元法及Newmark-Beta法求解了模拟转子跌落及碰撞方程。计算结果表明:转子高速跌落时,转动动能若无法有效消减,转子将在轴承内圈长时间涡动,导致轴承内圈表面产生极大的接触应力及变形;辅助轴承的支撑刚度有降低振幅的作用,支撑阻尼有消减振动能量的作用。实际应用时,选择适中的辅助轴承支撑刚度和较大的支撑阻尼,通过两者相匹配可有效减小转子跌落对发动机机体的冲击,同时快速降低跌落冲击造成的振动。In order to study the impingement of the rotor drop on the backup bearings to the bearing, the bearing pedestal and the whole engine after the failure of active magnetic bearings(AMBs), a mechanical model for rotor drop and crash has been developed. A simulated rotor system is modeled by the finite element method and then solved by the Newmark-Beta method. The results show that when the dropping at high speeds, if the kinematic energy of the rotor is not properly reduced, the rotor will whirl inside the backup bearings for a long time, introducing remarkable contact stress and deformation. Supporting stiffness of the backup bearings would inhibit the vibration of both the rotor and the bearing, and supporting damping would dissipate the vibration energy. Moderate supporting stiffness and large supporting damping could be selected and matched to reduce the impact to the engine caused by the rotor drop while the vibration is quickly absorbed.

关 键 词：航空发动机 主动电磁轴承 辅助轴承 转子跌落 支撑刚度 支撑阻尼 

分 类 号：V233.45[航空宇航科学与技术—航空宇航推进理论与工程]