| 丁小飞1,2 ，廖明夫 1 ，韩方军 2 ，冯国全 2 ，葛向东 2.航空发动机振动突增问题分析[J].航空发动机,2023,49(2):105-111 |
| 航空发动机振动突增问题分析 |
| Analysis of Sudden Increase of Vibration in Aeroengine |
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| DOI： |
| 中文关键词: 机振动 振动突增 支承刚度 轴心轨迹 航空发动机 |
| 英文关键词:engine vibration sudden increase of vibration bearing stiffness orbit aeroengine |
| 基金项目:中国科协青年人才托举工程资助 |
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| 中文摘要: |
| 针对某型航空发动机在试车过程中的稳态振动突增及高压转子轴心轨迹变化，基于动力学普遍方程及实际发动机的具
体情况，开展了故障因素排查；采用数值仿真计算方法建立了双转子发动机动力学分析模型，分析了K 5 支撑刚度对整机振动的影
响。结果表明：K 5 支撑刚度由各向同性到各向异性状态且刚度值发生变化，发动机支点的振动值将增大且轴心轨迹发生改变，仿
真结果与试车结果一致。分析认为稳态振动突增及转子轴心轨迹变化的主要原因是支撑刚度变化造成的，其主要由于发动机涡
轮后机匣在工作过程中受热变形，促使拉杆由自由向拉紧状态变化，导致K 5 支撑刚度发生变化。研究方法及分析结果对发动机整
机振动异常排故具有指导意义。 |
| 英文摘要: |
| Aiming at the sudden increase of steady-state vibration and the change of high-pressure rotor orbit in the test of an aeroen?
gine，based on the general dynamic equation and the details of the engine under test，fault factors investigation was conducted. Using nu?
merical simulation methods，the dynamic analysis model of the twin-spool engine was established，and the influence of the K 5 bearing stiff?
ness on engine vibration was analyzed. The results show that if the stiffness of the K 5 bearing changes from an isotropic to an anisotropic
state and stiffness values change，the bearing vibration will increase and the rotor orbit will change. The simulation results are consistent
with the test result . It is considered that the sudden increase of steady-state vibration and the change of rotor orbit is mainly caused by the
change of bearing stiffness，which is mainly due to the thermal deformation of the engine turbine rear casing during engine operation，
which changes the tie rods from free-state to tension-state，resulting in the change of K 5 bearing stiffness. The research methods and analy?
sis results can serve as a guide for future troubleshooting of abnormal vibrations. |
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